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  Subjects -> ENGINEERING (Total: 2282 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (186 journals)
    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1204 journals)
    - ENGINEERING MECHANICS AND MATERIALS (385 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (68 journals)
    - MECHANICAL ENGINEERING (90 journals)

CIVIL ENGINEERING (186 journals)                     

Showing 1 - 186 of 186 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 17)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 34)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 27)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 30)
Architectural Engineering     Open Access   (Followers: 4)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 1)
Archives of Civil Engineering     Open Access   (Followers: 10)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 1)
ATBU Journal of Environmental Technology     Open Access   (Followers: 3)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 6)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription   (Followers: 1)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 9)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 4)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 4)
Berkeley Planning Journal     Open Access   (Followers: 7)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 15)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 15)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 11)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 10)
Case Studies in Structural Engineering     Open Access   (Followers: 9)
Cement and Concrete Composites     Hybrid Journal   (Followers: 17)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 2)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 5)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 7)
Civil And Environmental Engineering Reports     Open Access   (Followers: 5)
Civil and Environmental Research     Open Access   (Followers: 19)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 17)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 9)
Civil Engineering Dimension     Open Access   (Followers: 8)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 258)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 10)
Computers & Structures     Hybrid Journal   (Followers: 36)
Concrete Research Letters     Open Access   (Followers: 6)
Construction Economics and Building     Open Access   (Followers: 2)
Construction Engineering     Open Access   (Followers: 8)
Construction Management and Economics     Hybrid Journal   (Followers: 21)
Construction Science     Open Access   (Followers: 4)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 2)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 16)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 14)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 8)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 16)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access  
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 4)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 6)
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 2)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 22)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 16)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 13)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 8)
International Journal of Geo-Engineering     Open Access   (Followers: 3)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Masonry Research and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Pavement Research and Technology     Open Access   (Followers: 4)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 2)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 10)
International Journal of Structural Integrity     Hybrid Journal   (Followers: 2)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Built Environment     Open Access   (Followers: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 6)
International Journal Sustainable Construction & Design     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 15)
Journal of Building Engineering     Hybrid Journal   (Followers: 1)
Journal of Building Materials and Structures     Open Access   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 6)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 11)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 7)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Society     Hybrid Journal   (Followers: 3)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 24)
Journal of Construction Engineering     Open Access   (Followers: 7)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 19)
Journal of Construction Engineering, Technology & Management     Full-text available via subscription   (Followers: 4)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 8)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Journal of Fluids and Structures     Hybrid Journal   (Followers: 6)
Journal of Frontiers in Construction Engineering     Open Access   (Followers: 2)
Journal of Green Building     Full-text available via subscription   (Followers: 11)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 12)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 21)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (Followers: 5)
Journal of Marine Science and Engineering     Open Access   (Followers: 1)
Journal of Materials and Engineering Structures     Open Access   (Followers: 4)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 10)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Offshore Structure and Technology     Full-text available via subscription  
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 4)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 7)
Journal of Rehabilitation in Civil Engineering     Open Access   (Followers: 3)
Journal of Solid Waste Technology and Management     Full-text available via subscription   (Followers: 1)
Journal of Structural Engineering     Full-text available via subscription   (Followers: 39)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Sustainable Architecture and Civil Engineering     Open Access   (Followers: 3)
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 1)
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 4)
Jurnal Spektran     Open Access   (Followers: 1)
Jurnal Teknik Sipil dan Perencanaan     Open Access  
Konstruksia     Open Access  
KSCE Journal of Civil Engineering     Hybrid Journal   (Followers: 2)
Latin American Journal of Solids and Structures     Open Access   (Followers: 4)
Materiales de Construcción     Open Access  
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 17)
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 6)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 2)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 4)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 7)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 11)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 4)
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Recent Trends In Civil Engineering & Technology     Full-text available via subscription   (Followers: 4)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 9)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 6)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Selected Scientific Papers - Journal of Civil Engineering     Open Access   (Followers: 3)
Slovak Journal of Civil Engineering     Open Access   (Followers: 2)
Soils and foundations     Full-text available via subscription   (Followers: 4)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 9)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Safety     Hybrid Journal   (Followers: 7)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 23)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 12)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 8)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access  
Teknik     Open Access  
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
The Structural Design of Tall and Special Buildings     Hybrid Journal   (Followers: 6)
Thin Films and Nanostructures     Full-text available via subscription   (Followers: 2)
Thin-Walled Structures     Hybrid Journal   (Followers: 4)
Transactions of the VŠB - Technical University of Ostrava. Construction Series     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Underground Space     Open Access  
Water Science & Technology     Partially Free   (Followers: 25)
Water Science and Technology : Water Supply     Partially Free   (Followers: 22)

           

Journal Cover Archives of Civil and Mechanical Engineering
  [SJR: 0.94]   [H-I: 19]   [1 followers]  Follow
    
   Full-text available via subscription Subscription journal
   ISSN (Print) 1644-9665
   Published by Elsevier Homepage  [3044 journals]
  • Impact of Zn and Ca on dissolution rate, mechanical properties and GFA of
           resorbable Mg–Zn–Ca metallic glasses
    • Authors: Ryszard Nowosielski; Katarzyna Cesarz-Andraczke
      Pages: 1 - 11
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Ryszard Nowosielski, Katarzyna Cesarz-Andraczke
      This article presents investigations utility of Mg-based metallic glasses for resorbable orthopedic implants. Exploration of biocompatible Mg–Zn–Ca alloys in order to determine Zn and Ca optimum concentration were conducted, based on three criteria: sufficiently high GFA (glass forming ability), sufficiently high tensile strength, microhardness and the suitable dissolution rate (corrosion rate) in Ringer's solution. Fulfillment of these criteria should ensure bone union before implant dissolution. The optimatization of Ca and Zn concentration in the range of 4–6at.% Ca and 28–32at.% Zn was executed. The samples in form of ribbons (0.02–0.05mm thickness) and rods (about diameter up to 4mm) with amorphous structure were produced. These investigations allowed to determine the GFA. The optimal results for Mg66Zn30Ca4 and Mg64Zn32Ca4 alloys: tensile strength: 191–166MPa, microhardness: 291–263 HV and volume of released hydrogen 0.04–0.12ml/cm2/h. The corrosion studies - immersion and potentiodynamic methods were conducted (including measurement specific corrosion current density for Mg alloys). Finally, a comparative analysis was performed, which indicated the impact of Ca and Zn concentration on: GFA, mechanical properties and dissolution rate of studied metallic glasses.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.009
       
  • Transient forced vibration response analysis of heterogeneous sandwich
           circular plates under viscoelastic boundary support
    • Authors: M.M. Alipour
      Pages: 12 - 31
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): M.M. Alipour
      For the first time the transient bending analysis of a sandwich plate with viscoelastic boundary support is investigated in this study. Viscoelastic support consists of two sets of translational springs and dashpots connected in parallel along the in-plane and transverse directions. The sandwich plate is fabricated from heterogeneous face sheets where the material properties of each face sheets are assumed to be varied continuously in the radial direction according to a power-law function. Variations of the material properties of each face sheets are monitored by eight distinct inhomogeneity parameters. Therefore, the solution procedure may be used for a wide range of the practical problems. In order to investigate the effects of viscoelastic edge supports on the transient response of sandwich plate a wide range of the stiffness and damping coefficients of the edge supports in the in-plane and transverse directions are applied. Results of sandwich plates with the classical edge conditions as some special cases of the elastic/viscoelastic supports are compared with those extracted from the ABAQUS software based on the 3D theory of elasticity. The comparisons show that even for relatively complicated cases, there is a good agreement between the results.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.007
       
  • A new hybrid fuzzy MCDM approach for evaluation of construction equipment
           with sustainability considerations
    • Authors: Mehdi Keshavarz Ghorabaee; Maghsoud Amiri; Edmundas Kazimieras Zavadskas; Jurgita Antucheviciene
      Pages: 32 - 49
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Mehdi Keshavarz Ghorabaee, Maghsoud Amiri, Edmundas Kazimieras Zavadskas, Jurgita Antucheviciene
      Because of the possible harmful effects of construction equipment on the environment, evaluation of them can be considered as a helpful activity to move toward the sustainability in construction. This evaluation process could involve some alternatives and some criteria in a discrete decision space. In this study, a new hybrid multi-criteria decision-making (MCDM) approach is proposed to deal with this evaluation process in the fuzzy environment. We present fuzzy extensions of the SWARA (Step-wise Weight Assessment Ratio Analysis) and CRITIC (CRiteria Importance Through Intercriteria Correlation) methods for determining subjective and objective weights of criteria. Based on these extended methods and the fuzzy EDAS (Evaluation based on Distance from Average Solution) method, a new hybrid approach is proposed. In this approach, the subjective and objective criteria weights are combined to determine more justified weights for criteria. The proposed approach is applied to a case study of construction equipment evaluation with sustainability considerations. To examine the result of evaluation, a sensitivity analysis is performed based on varying criteria weights. A comparison is also made between the results of the proposed approach and some existing MCDM methods. These analyses show the stability and validity of the results and efficiency of the proposed approach.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.04.011
       
  • The tension-shear fracture behavior of polymeric bone cement modified with
           hydroxyapatite nano-particles
    • Authors: Majid Reza Ayatollahi; Seyed Alireza Mirmohammadi; Hadi Asgharzadeh Shirazi
      Pages: 50 - 59
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Majid Reza Ayatollahi, Seyed Alireza Mirmohammadi, Hadi Asgharzadeh Shirazi
      Polymethylmethacrylate (PMMA)-based bone cement is a well-known polymer in the medicine, especially orthopedic. However it has some drawbacks like lack of enough biocompatibility and poor mechanical properties. These problems can be addressed by incorporation of nano-materials. Hydroxyapatite has been proved to enhance biocompatibility of acrylic bone cements. This bioceramic can affect the mechanical properties of polymeric cements as well. In this study, a number of fracture tests were carried out to investigate the influence of nano-hydroxyapatite (HA) on the fracture behavior of acrylic bone cement under combined tension-shear (mixed mode) loading conditions. Semi-circular specimens were prepared by incorporating different amounts of HA powder into the cement matrix. It was found that adding up to 10wt% HA into the cement causes an increase in the fracture toughness of PMMA/HA nano-composite in all modes. However, pure cement exhibited the greatest fracture resistance among all samples. Moreover, the comparison between the experimental and theoretical results showed that the generalized maximum tangential stress criterion could estimate the experimental data satisfactorily.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.06.001
       
  • Comparison of compressive strength and electrical resistivity of
           cementitious composites with different nano- and micro-fillers
    • Authors: Shan Jiang; Daocheng Zhou; Liqing Zhang; Jian Ouyang; Xun Yu; Xia Cui; Baoguo Han
      Pages: 60 - 68
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Shan Jiang, Daocheng Zhou, Liqing Zhang, Jian Ouyang, Xun Yu, Xia Cui, Baoguo Han
      Cementitious composites with 0–1.5wt.% Nano-SiO2 (NS), nano-TiO2 (NT), carbon nanotubes (CNTs), carbon nanofibers (CNFs) and carbon microfibers (CFs) are fabricated and tested. The enhancing effects of different fillers on the compressive strength and electrical resistivity of composites are compared, and the underlying modification mechanisms of fillers to composites are investigated by analyzing the difference in the morphology of fillers and rheology of composites. The compressive strength of composites containing 0.1% NS, 0.5% NT, 0.1% CNTs and 0.5% CFs by weight of cement presents approximately 12.5%, 20.8%, 16.8% and 21.4% higher than that of control sample, respectively. It is revealed that CFs also have improving effect on the compressive strength of composites besides flexural strength. When the composites with nano-fillers cannot be processed to ideal state, the reinforcing effect of nano-fillers is no better but even worse than that of micro-fillers. Composites with CNTs, CNFs and CFs possess good electrical conductivity. Composites with CNFs and CFs have a percolation threshold of electrical resistivity below 0.5%, while the percolation threshold of electrical resistivity of composites with CNTs is about 1%. Although CNFs do not have significant effect on compressive strength of composites, they have the best improvement to electrical resistivity.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.010
       
  • Fatigue hazards in welded plate crane runway girders – Locations,
           causes and calculations
    • Authors: Kazimierz Rykaluk; Krzysztof Marcinczak; Sławomir Rowiński
      Pages: 69 - 82
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Kazimierz Rykaluk, Krzysztof Marcinczak, Sławomir Rowiński
      Steel crane runway beams compared with other building structures are exposed to extremely complex load-stress conditions. It turns out, that significant from the point of view of the resistance of the crane runway beams is a cyclic nature of fluctuating loads, which leads to formation of numerous cracks and damages. This effect is especially characteristic for webs in plate I – cross sections of crane runway beams. The complex state of stresses is generated by overall bending that causes normal and shear stresses – σ x , τ xz , and by crane wheel eccentric load that produces respectively stresses – σ z,x , σ o,x , τ o,xz . Stress components produced by overall bending are determined as I kind stress, whereas the stress components from the crane wheel load are introduced as II kind stress. Such a combination of stresses lowers the fatigue strength of the web, which is ignored by many rules specified in standards. Limited fatigue strength is observable, among others, in crane rails splices. The results of numerical analyses obtained as II kind stresses in the web located directly beneath the crane rails splices that occur as: orthogonal contact, bevel contact and stepped bevel contact as well, confirmed the complexity of the issue. Following that, other factors, not being defined yet, but affecting the stress state of the both crane rail and crane runway beam are scheduled to be studied, as for instance, the eccentric load induced by crane trolley in mentioned above elements.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.003
       
  • Quality of self-piercing riveting (SPR) joints from cross-sectional
           perspective: A review
    • Authors: Rezwanul Haque
      Pages: 83 - 93
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Rezwanul Haque
      Self-piercing riveting (SPR) is a method used for joining sheet materials by creating a mechanical interlock between the sheets. SPR is of increasing interest in automobile industries due to its suitability for joining lightweight, high strength and dissimilar materials. The quality of an SPR joint from cross-sectional perspective is primarily characterized by the amount of mechanical interlock known as rivet flaring. Other parameters, such as rivet head height, bottom thickness and effective length of the rivet in the bottom sheet are also considered as quality parameters. However, the many factors that determine the quality of an SPR joint are poorly described in the literature and, as a consequence, the opportunities to develop new product and optimize the process are limited. In this paper, several of the key parameters that affect the quality of an SPR joint are described and some assistive technologies that have the potential of improving the quality of a joint are discussed. This is a zone in the field of SPR joining which has plenty of research opportunities. Innovative progress will be achieved by a combination of techniques, together with industrial trials and laboratory simulations.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.06.003
       
  • Experimental study of Portevin–Le Châtelier bands on tensile and plane
           strain tensile tests
    • Authors: Ndeye Awa Sene; Pascale Balland; Khaidre Bouabdallah
      Pages: 94 - 102
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Ndeye Awa Sene, Pascale Balland, Khaidre Bouabdallah
      The aim of this article is to show that it is possible to create an experimental database to better model Portevin–Le Châtelier (PLC) phenomenon with two kinds of solicitation. Indeed, two kinds of specimen are tested: conventional tensile specimens and specimens designed for plane strain tensile test. In order to better understand this phenomenon and above all to put away any geometry effect, two materials are tested: one without PLC bands (AU4G) that is used as reference and AlMg3 which is well known for its PLC bands. The image correlation tool is used to analyse the creation and the spread of PLC bands. Characteristic parameters of the bands are then measured: width, angle, transported strain, strain rate, and velocity. The originality of this paper is first to show that PLC bands are present during plane strain tensile test and then to characterize the bands thanks to image correlation. These experimental databases could be very useful for those who develop models on PLC phenomenon.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.005
       
  • Determination of critical pressure in analyzing of rupture instability for
           hydromechanical deep drawing using advanced yield criterion
    • Authors: Morteza Alizad-Kamran; Mohammad Hoseinpour Gollo; Abbas Hashemi; S.M. Hossein Seyedkashi
      Pages: 103 - 113
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Morteza Alizad-Kamran, Mohammad Hoseinpour Gollo, Abbas Hashemi, S.M. Hossein Seyedkashi
      Hydromechanical deep drawing (HMDD) is a sheet hydroforming process to produce complex workpieces with high drawing ratio. Fluid pressure used during the forming process is one of the most effective parameters in this process in which increasing critical pressure causes to rupture occurrence. Since the material properties in different angles respect to the rolling direction affect the amount of critical pressure, it is important to develop an appropriate theoretical model for prediction of plastic behavior of material with high precision. In this paper, a theoretical model based on BBC2008 yield criterion including 8 and 16 parameters (8p and 16p) is developed to determine critical pressure in HMDD process. With applying uniaxial and equi-biaxial tensile tests and optimizing an error-function by using Levenberg–Marquardt method, the parameters of BBC2008 yield criterion can be determined. Low carbon St14 steel sheets are utilized for experimental samples to verify critical pressure obtained from the proposed theoretical model. BBC2008 model with 8p and 16p is compared with Barlat–Lian 1989 and experiments. The results show that BBC2008-16p yield criterion can provide a more precise model of material behavior in planar anisotropy properties, while BBC2008-8p yield criterion have a better prediction of rupture occurrence in HMDD process.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.008
       
  • Cyclic oxidation of palladium modified and nonmodified aluminide coatings
           deposited on nickel base superalloys
    • Authors: Maryana Zagula-Yavorska; Jan Sieniawski
      Pages: 130 - 139
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Maryana Zagula-Yavorska, Jan Sieniawski
      Palladium layer (7μm thick) was deposited on the surface of the Inconel 713 LC, Inconel 625 and CMSX 4 Ni-base superalloys by the electroplating method. Electroplated samples were annealed at 1050°C for 2h in the argon atmosphere. The aluminide coatings were deposited by the CVD method. The nonmodified aluminide coating consists of the NiAl phase. Palladium modification let to formation of the (Ni,Pd)Al phase in coatings. The palladium modified as well as nonmodified coatings were oxidized at 1100°C in the air atmosphere. For both Inconel 713 LC and CMSX 4 superalloys palladium modified coatings show better oxidation resistance than nonmodified ones. Palladium inhibits the outward diffusion of substrate elements (cobalt and chromium) during oxidation of the aluminide coating. Moreover, it stabilizes the β-NiAl phase, keeps the higher content of aluminum in the β-NiAl phase for a long time and thus increases the lifetime of the coated substrate.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.004
       
  • Water demand forecasting by trend and harmonic analysis
    • Authors: Edward Kozłowski; Beata Kowalska; Dariusz Kowalski; Dariusz Mazurkiewicz
      Pages: 140 - 148
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Edward Kozłowski, Beata Kowalska, Dariusz Kowalski, Dariusz Mazurkiewicz
      Water demand forecasting in water supply systems is one of the basic strategic management tasks of water supplying companies. This is done using specially designed water consumption models which generate data necessary for planning operational activities. A high number of water demand forecasting methods proposed in the literature points to the complexity and significance of the problem for current operation of water supplying companies. However, it must be observed that no universal method applicable to any water supply system has been developed so far. In addition to this, there is no method which could be considered referential relative to other methods. For this reason, it is necessary to continue the research on forecasting methods enabling effective forecasts based on suitably selected sets of input quantities. This paper proposes a solution for water consumption forecasting in a water supply system, wherein hourly water consumption is determined by trend analysis and harmonic analysis. Trend analysis consists in estimating parameters of models for individual phases of a cycle, while harmonic analysis is based on the assumption that a time series consists of sine and cosine waves with different frequencies known as harmonics. In addition, relationships between structural parameters of individuals harmonics and ambient temperature are investigated using the least squares method.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.05.006
       
  • New forming possibilities in cross wedge rolling processes
    • Authors: Zbigniew Pater; Janusz Tomczak; Tomasz Bulzak
      Pages: 149 - 161
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Zbigniew Pater, Janusz Tomczak, Tomasz Bulzak
      The paper describes limitations in the process of cross wedge rolling (CWR). The problem of necking (rupture) of a shaft step is discussed in detail. In addition, the paper also overviews the state of the art of modelling the cross wedge rolling process by the finite element method-based software, Deform-3D. Next, the paper presents methods for increasing effectiveness in two types of CWR: cross wedge rolling where axial flow of metal is blocked and cross wedge rolling with upsetting. The proposed rolling methods are then verified numerically by Deform-3D. Finally, the presented solutions are verified in experimental tests of a rolling process for producing a lever (with blocked axial flow of metal) and for an upset rolling process for producing a driving shaft.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.06.005
       
  • Experimental and numerical investigation of lead-rubber dampers in chevron
           concentrically braced frames
    • Authors: Keyvan Zeynali; Habib Saeed Monir; Nadia M. Mirzai; Jong Wan Hu
      Pages: 162 - 178
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Keyvan Zeynali, Habib Saeed Monir, Nadia M. Mirzai, Jong Wan Hu
      This paper presents a theoretical and experimental evaluation of the application of lead rubber dampers (LRD) in the chevron bracing of structures. This device consists of a circular lead core with several layers of steel and rubber plates that are sandwiched together. This damper was manufactured at the earthquake engineering laboratory of Urmia University and installed inside a SDOF steel frame. The frame was placed on a shaking table, and its responses under several earthquake excitations were recorded. A 3D finite element model was created for the device, and hyper-elastic properties were determined for the rubber layers. To check the effectiveness of the device in mitigating the responses of multi-story frames, several nonlinear time history analyses were conducted on the structures using three earthquake excitations. The results indicate that significant reductions in the stories’ drift can be achieved by installing lead-rubber dampers in the chevron bracing.

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.06.004
       
  • Mechanical properties and abrasive wear behaviors of in situ
           nano-TiCx/Al–Zn–Mg–Cu composites fabricated by combustion synthesis
           and hot press consolidation
    • Authors: Yu-Yang Gao; Feng Qiu; Shu-Li Shu; Lei Wang; Fang Chang; Wei Hu; Xue Han; Qiang Li; Qi-Chuan Jiang
      Pages: 179 - 187
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Yu-Yang Gao, Feng Qiu, Shu-Li Shu, Lei Wang, Fang Chang, Wei Hu, Xue Han, Qiang Li, Qi-Chuan Jiang
      The in situ nano-TiC x /Al–Zn–Mg–Cu composites with different TiC x content (20, 25 and 30vol.%) were successfully fabricated by combustion synthesis and hot press consolidation in Al–Ti–C/CNTs systems. The compressive properties and abrasive wear resistance of the composites improved with the increase in the TiC x content. The transformation of carbon source from pure C black to the mixture of C black and CNTs to pure CNTs in Al–Ti–C/CNTs systems leaded to a significant improvement in the compressive properties and wear resistance of the composites as well as a significant decrease in the average size of TiC x particles. The average size of the nano-TiC x particles in 30vol.% TiC x /Al–Zn–Mg–Cu composite synthesized by the carbon source of CNTs reached 81nm, moreover, the yield strength (σ 0.2), the ultimate compression strength (σ UCS) and the fracture strain (ɛ f) of the composite reached 597MPa, 882MPa and 21.7%, respectively.
      Graphical abstract image

      PubDate: 2017-07-19T21:28:15Z
      DOI: 10.1016/j.acme.2017.06.009
       
  • Anisotropy of thermal expansion of 3Y-TZP, α-Al2O3 and composites from
           3Y-TZP/α-Al2O3 system
    • Authors: Grzegorz Grabowski; Radosław Lach; Zbigniew Pędzich; Konrad Świerczek; Agnieszka Wojteczko
      Pages: 188 - 197
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Grzegorz Grabowski, Radosław Lach, Zbigniew Pędzich, Konrad Świerczek, Agnieszka Wojteczko
      The work deals with determining of lattice parameters (not present in the literature till now) in the temperature range of 295–1473K for tetragonal zirconia polycrystals, stabilized with 3mol.% of yttria and for corundum (α-Al2O3). Basing on lattice parameters changes with temperature, thermal expansion coefficients for 3Y-TZP and α-Al2O3 monocrystals along a and c crystallographic axis were determined. The calculated values of axial coefficients of thermal expansion were used for creation of a micromechanical model for simulation of thermal expansion of materials, constituting the real microstructures of composites from 3Y-TZP/α-Al2O3. The results of simulations were compared with thermals expansion coefficients, determined by dilatometric measurements and performed for real composites.
      Graphical abstract image

      PubDate: 2017-07-25T21:45:33Z
      DOI: 10.1016/j.acme.2017.06.008
       
  • Mechanical behavior of an opening in a jointed rock-like specimen under
           uniaxial loading: Experimental studies and particle mechanics approach
    • Authors: R.H. Cao; P. Cao; H. Lin; G.W. Ma; X. Fan; X.G. Xiong
      Pages: 198 - 214
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): R.H. Cao, P. Cao, H. Lin, G.W. Ma, X. Fan, X.G. Xiong
      Generally, in many cases of rock engineering, the openings often constructed in rock-mass containing non-persistent joints. However, comparing with the previous works, few studies investigate the failure or damage due to the crack propagation and coalescence around an opening. Based on the uniaxial compression tests and particle flow code (PFC) the interaction effect of opening and joints on the crack coalescence behavior around an opening are investigated in this study. From the view of experimental and numerical results, strength parameters are mainly effected by joints (inclination and distance). Specifically, the uniaxial compressive strength of jointed specimen (UCSJ) and elastic modulus of jointed specimen (E J) of specimens decrease for 0°≤ α ≤45° and increase for α >45°. UCSJ and E J increases with increasing joint distance (d) for all joint inclination angel (α) values, with the highest and lowest strengths obtained for d =50mm and d =20mm, respectively. The opening has a great influence on the failure mode of jointed specimen. Unlike previous results, in this study, jointed specimens present four new kinds of failure modes: Mode-I (horizontally symmetrical splitting failure); Mode-II (stepped failure at opening sides); Mode-III (failure through a plane); Mode-IV (mixed failure). The strength parameters and failure modes in the numerically simulated and experimental results are in good agreement, and the results are expected to be useful in predicting the stability of an opening in a non-persistently jointed mass.

      PubDate: 2017-07-25T21:45:33Z
      DOI: 10.1016/j.acme.2017.06.010
       
  • Enhanced mechanical properties of in situ aluminium matrix composites
           reinforced by alumina nanoparticles
    • Authors: Yalda Afkham; Rasoul Azari Khosroshahi; Sajed Rahimpour; Cassra Aavani; Dermot Brabazon; Reza Taherzadeh Mousavian
      Pages: 215 - 226
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Yalda Afkham, Rasoul Azari Khosroshahi, Sajed Rahimpour, Cassra Aavani, Dermot Brabazon, Reza Taherzadeh Mousavian
      In situ fabrication of metal matrix composites has various advantages such as the formation of clean particle–metal interface with strong bonding. In this study, three types of metal oxides powders (commercial TiO2, commercial ZnO, and recycled Pyrex) were injected into a pure aluminium melt to fabricate in situ aluminium matrix composites. Through chemical reaction this process produces alumina nanoparticles which act as the reinforcing agent. The process steps investigated include liquid-state stir casting at 1123K followed by a hot rolling process. SEM and FESEM microstructural characterizations, as well as EDAX analysis, were used to determine the reactions, which occurred between the molten aluminium and the metal oxides to form nano alumina particles as the reinforcement. Tensile and microhardness tests were also performed on the rolled composites, to identify the effect of metal oxide type and amount, on the mechanical properties of the produced composites. It was found that using recycled Pyrex crushed powders led to the formation of a uniform distribution and reinforcement of alumina nanoparticles, while fine-micron ZnO and especially TiO2 powders did not uniformly distribute in the melt.

      PubDate: 2017-07-25T21:45:33Z
      DOI: 10.1016/j.acme.2017.06.011
       
  • An empirical examination of the thickness profile formation of
           twin-roll-cast magnesium strips
    • Authors: Claudia Kawalla; Michael Höck; Madlen Ullmann; Christian M. Ringle
      Pages: 227 - 234
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Claudia Kawalla, Michael Höck, Madlen Ullmann, Christian M. Ringle
      The recently developed technology of twin-roll-cast (TRC) magnesium strips permits an efficient production of magnesium sheets, primarily for the automotive industry. The focus of the paper is to develop a structural equation model explaining the variance of the thickness profile formation. Hence, the complex and partially unknown relationships between twin-roll casting process parameters and the thickness profile formation are analyzed using latent variables, e.g. the deformation resistance, length of contact arc, etc., which consist of several observed parameters. The fundamental process variables and their effect on the thickness profile formation during twin-roll casting are investigated and evaluated by partial least squares structural equation modeling (PLS-SEM) – a statistical method that fits networks of constructs to empirical data. The results of the predictive modeling technique allow an approximation of the existing interrelationships between thickness profiles, rolling force as well as processes in the roll gap which are typically difficult to measure directly using sensors. In this context, it was identified that the thickness profile variation is primarily caused by the forming force, which is mainly driven by the length of contact arc. Moreover, implications for the control of the thickness profile are derived.

      PubDate: 2017-07-25T21:45:33Z
      DOI: 10.1016/j.acme.2017.06.006
       
  • Analysis of the mechanical properties and of micrographs of refill
           friction stir spot welded 7075-T6 aluminium sheets
    • Authors: Andrzej Kubit; Rafał Kluz; Tomasz Trzepieciński; Dawid Wydrzyński; Wojciech Bochnowski
      Pages: 235 - 244
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Andrzej Kubit, Rafał Kluz, Tomasz Trzepieciński, Dawid Wydrzyński, Wojciech Bochnowski
      The main aim of the investigations was to determine the significance of parameters of RFSSW for the strength parameters of the resulting joint. RFSSW joints were made in 0.8-mm-thick 7075-T6 aluminium alloy using different welding parameters (tool rotational speed v, tool plunge depth, and joining time). The load capacity of joints was determined by shear tests. The optimum welding parameters which assure the highest load capacity (4.09kN) in the tensile/shear test are: tool rotational speed of 3000rpm, tool plunge depth of 1.55mm, and joining time of 1.25s. In the conditions of the static tensile test under pure shear the highest joint capacity (6.48kN) is found for the joint welded at a tool plunge depth of 1.7mm. Depending on the tool plunge depth, three types of joint damage were observed during tensile/shear tests: plug type fracture, shear fracture, and plug-shearracture. Incomplete refill is the main weld defect observed which is located on the path along which the sleeve plunges into the sheet. It was also found that alclad between the upper and lower sheets worsens the joint quality between the stir zone and thermo-mechanically affected zone.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.07.005
       
  • Formation mechanism and control methods of inhomogeneous deformation
           during hot rough rolling of aluminum alloy plate
    • Authors: Pujun Hao; Anrui He; Wenquan Sun
      Pages: 245 - 255
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Pujun Hao, Anrui He, Wenquan Sun
      The inhomogeneous deformation which appears in hot rough rolling of aluminum alloy plate, reduces rolling output and negatively affects the rolling process. To study the formation mechanism of the inhomogeneous deformation, a finite element model for the five-pass hot rough rolling process of aluminum alloy plate is built. Results show that inhomogeneous deformation distribution in thickness direction causes two bulges at head and tail ends, as indicated by the analysis of the equivalent plastic strain distribution and deformation. However, formation mechanism of the inhomogeneous deformation at head end differs from that at tail end. Changing the end shape and angular rolling are adopted for decreasing the length and width of the crocodile mouth. It can be found that the crocodile mouth can be improved effectively by increasing the central bump length and the rotation angles through simulation and experiments. Then, the combination effect of two methods is simulated and results show that the combination effect is better than respectively using of each method. In addition, combination of two methods can avoid the restricted conditions for respectively using of each method.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.07.004
       
  • Reliability-based dynamical design of a singular structure for high energy
           physics experiments
    • Authors: Roberto Palma; Jordi Torrent; José L. Pérez-Aparicio; Lluis Ripoll
      Pages: 256 - 266
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Roberto Palma, Jordi Torrent, José L. Pérez-Aparicio, Lluis Ripoll
      The present work presents a comprehensive design and dynamic calculation of singular metallic structures, part of the Neutrino Experiment NEXT. The experiment uses an electroluminescent TPC chamber, a high-pressure 136Xe gas vessel enclosing the detector. A lead-block “castle” or containing box shields this vessel against external γ-rays from all directions; in spite of its heavy weight, the castle must be regularly open for the detector maintenance. Since the structures will be constructed at a middle-level seismic localization (Laboratorio Subterráneo Canfranc, Spain), the earthquake hazard must be taken into account. Vessel and castle are supported by a rigid frame, which must satisfy two requirements: (i) the Spanish seismic standard, (ii) for equipment protection, the detector maximum horizontal acceleration must be <1 [m/s2]. This frame rests on special base isolators to decrease horizontal accelerations in case of an earthquake. Three dynamical calculations are conducted: (i) a response spectrum analysis to comply with the standard, (ii) five time-history analyses to calculate tolerances and, (iii) a reliability-based approach using 1000 time-history responses to ensure satisfaction of the operating requirements. The final outcome is the design of a singular structure optimized for the NEXT experiment with a probability of failure against any standard earthquake of only 0.125%.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.07.003
       
  • Generalized model of imperfection forces for design of transverse roof
           bracings and purlins
    • Authors: Antoni Biegus; Dariusz Czepiżak
      Pages: 267 - 279
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Antoni Biegus, Dariusz Czepiżak
      The EN 1993-1-1 calculation model of initial, equivalent bow imperfection forces q d acting on the bracing system assumes that the stabilized member is uniformly compressed within his length. But this assumption is incorrect. The distribution of the axial compression force in the restrained roof rafter varies along its length and usually has a parabolic shape. This paper proposes refined generalized models for identifying the imperfection forces in members to be restrained, having an initial bow imperfection with maximum amplitude e 0. The models were derived on the basis of the real parabolic shape of the axial forces distribution in restrained roof girders. The effect of lateral imperfection amplitude e 0 of the restrained girder is accompanied by twist imperfection ϕ 0 measured as the angle of rotation of the webbed girder plane or the plane passing through the truss top and the bottom chords. The latter imperfection profile component generates additional horizontal imperfection forces H 1,i not included in the current design codes. Analytical relations for calculating imperfection force q di and force H 1,i are provided in order to evaluate the state of stress in both the purlins and the bracings. The considered problem is illustrated with a calculation example.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.07.002
       
  • On the influence of repetitive corrugation and straightening on the
           microstructure and mechanical properties of AA 8090 Al-Li alloy
    • Authors: Jenix Rino J; Balasivanandha Prabu S; Padmanabhan K. A
      Pages: 280 - 290
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Jenix Rino J, Balasivanandha Prabu S, Padmanabhan K. A
      This paper reports on the improvements in the mechanical properties of AA8090 Al-Li alloy subjected to repetitive corrugation and straightening (RCS). AA 8090 Al-Li alloy sheets were processed using different corrugation profiles (semi-circular, flat-groove and V-groove) at 300°C, with a pressing velocity of 2.5mm/s. This study shows that a V-grooved die favors grain refinement, e.g. a reduction in the average grain size from 65μm to 12μm after eight passes is achieved. Grain size distribution and misorientation between grain boundaries were studied using EBSD and TEM. The microstructures also appear to have more high-angle grain boundaries in the case of the specimen processed using the V-grooved die. The tensile strength increases with the number of passes, but drops when surface cracks appear after the 16th pass for a semi-circular die, the 12th pass for a flat grooved die and the 10th pass for a V-grooved die. In contrast, the hardness continues to increase with increasing number of passes. Ultra-fine-/nano-grains were present after the eighth pass in a sheet that was processed using a V-grooved die.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.07.006
       
  • Computational elastoplastic Limit Analysis of the Paderno d’Adda
           bridge (Italy, 1889)
    • Authors: Rosalba Ferrari; Giuseppe Cocchetti; Egidio Rizzi
      Pages: 291 - 310
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Rosalba Ferrari, Giuseppe Cocchetti, Egidio Rizzi
      The Paderno d’Adda bridge is a historical iron arch bridge built in 1889 for connecting the provinces of Lecco and Bergamo across the Adda river, in northern Italy. The bridge was designed through the so-called Theory of the Ellipse of Elasticity. Its use is two-fold: a railway track lays within the inner deck of its upper continuous beam; automotive traffic runs on top. Today, after 128 years of continuous duty, the viaduct keeps in service, with trains crossing at slow speed and alternated one-way road traffic with no heavy-weight vehicles. Starting from a computational formulation for the elastoplastic Limit Analysis of 3D truss-frame systems, apt to provide the exact limit load multiplier and attached collapse mechanism, the full evolutive piece-wise-linear response of the bridge is derived, for different try-out loading configurations. The structural analysis, wholly original in its computational implementation, aims at outlining a survey on the potential plastic collapse characteristics of the bridge. Results reveal possible structural deficiencies for the upper continuous beam, where main plasticizations appeared. Instead, elements of the piers plasticized only for tests with loading much un-symmetrically located to the crown of the arch and the slender doubly built-in parabolic arch rarely showed some plasticization. This evidences the arch as a robust characteristic beautiful feature of the bridge. Moreover, analyses pointed out that the effect of the normal forces on the elastoplastic response of the bridge shall not be considered as negligible, as instead it may be often considered in the Limit Analysis of frames.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.05.002
       
  • Fresh and hardened properties of 3D printable cementitious materials for
           building and construction
    • Authors: Suvash Chandra Paul; Yi Wei Daniel Tay; Biranchi Panda; Ming Jen Tan
      Pages: 311 - 319
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Suvash Chandra Paul, Yi Wei Daniel Tay, Biranchi Panda, Ming Jen Tan
      The main advantage of 3D concrete printing (3DCP) is that it can manufacture complex, non-standard geometries and details rapidly using a printer integrated with a pump, hosepipe and nozzle. Sufficient speed is required for efficient and fast construction. The selected printing speed is a function of the size and geometrical complexity of the element to be printed, linked to the pump speed and quality of the extruded concrete material. Since the printing process requires a continuous, high degree of control of the material during printing, high performance building materials are preferred. Also, as no supporting formwork is used for 3DCP, traditional concrete cannot be directly used. From the above discussion, it is postulated that in 3DCP, the fresh properties of the material, printing direction and printing time may have significant effect on the overall load bearing capacity of the printed objects. The layered concrete may create weak joints in the specimens and reduce the load bearing capacity under compressive, tensile and flexural action that requires stress transfer across or along these joints. In this research, the 3D printed specimens are collected in different orientations from large 3DCP objects and tested for mechanical properties. For the materials tested, it is found that the mechanical properties such as compressive and flexural strength of 3D printed specimen are governed by its printing directions.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.02.008
       
  • Robust and automatic measurement of grinding-induced subsurface damage in
           optical glass K9 based on digital image processing
    • Authors: Yong Jie Zhao; Yun Hui Yan; Ke Chen Song; Hao Nan Li
      Pages: 320 - 330
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Yong Jie Zhao, Yun Hui Yan, Ke Chen Song, Hao Nan Li
      Optical glass K9 is a critical kind of optical materials, however experiments have indicated that the mechanical grinding of K9 easily led to subsurface damage (SSD). Although substantial SSD measurement methods have been suggested, the problems including the prior knowledge of SSD and slow measurement speed still impede the reported method applications. To this end, this paper has presented an image-process-based method that can identify and measure the grinding-induced SSD in K9 specimens. By performing grinding trials, the method has been found to be able to accurately (with biggest relative error of 3.13% in comparison with the manually measured results) and quickly (with the measurement speed of 1.68sperimage) measure SSD depths. Without any parameter presetting, the method enables automatic SSD measurements, allowing the users without SSD knowledge to be able to use the method. Moreover, the method has shown the good robustness to the input image size, illumination, tilted specimen placement, and material flaws. The method is therefore anticipated to be meaningful for the industrial manufacturing, design and application of optical glass.

      PubDate: 2017-09-04T17:36:55Z
      DOI: 10.1016/j.acme.2017.07.009
       
  • Influence of heat treatment on the formation of ultrafine-grained
           structure of Al–Li alloys processed by SPD
    • Authors: K. Rodak; A. Urbańczyk-Gucwa; M. Jabłońska; J. Pawlicki; J. Mizera
      Pages: 331 - 337
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): K. Rodak, A. Urbańczyk-Gucwa, M. Jabłońska, J. Pawlicki, J. Mizera
      In this study, binary Al–2.3wt%Li alloy, ternary Al–2.2wt%Li–0.1wt%Zr alloy and quaternary Al–2.2wt%Li–0.1wt%Zr–1.2wt%Cu alloy in the solution treated condition and additionally in aging condition were severely plastically deformed by rolling with cyclic movement of rolls (RCMR) method to produce ultrafine grained structure. Scanning transmission electron microscopy (STEM), scanning electron microscopy with EBSD detector (SEM/EBSD) were used for microstructural characterization and hardness test for a preliminary assessment of mechanical properties. The results shows, that the combination of aging treatments with RCMR deformation can effectively increase the hardness of Al–Li alloys. Second particles hinders the annihilation of dislocations in Al matrix during deformation leading to an increase of dislocation density. Significant amount of nanometric second particles in refined structure to ultrafine scale especially in Al–2.2wt%Li–0.1wt%Zr–1.2wt%Cu alloy effectively prevents the formation of high angle boundaries.

      PubDate: 2017-09-15T19:36:41Z
      DOI: 10.1016/j.acme.2017.06.007
       
  • Numerical and experimental analysis of a cross wedge rolling process for
           producing ball studs
    • Authors: Tomasz Bulzak; Zbigniew Pater; Janusz Tomczak
      Pages: 729 - 737
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Tomasz Bulzak, Zbigniew Pater, Janusz Tomczak
      The paper reports the results of theoretical and experimental tests of a forming process for producing ball studs which are widely used in the automotive industry. It is proposed that semi-finished ball studs are produced by cross wedge rolling in a double configuration. The theoretical analysis was performed by numerical techniques based on the finite element method. Numerical computations were made using the simulation software DEFORM v 11.0. During the simulations, the accuracy of the adopted tool design was verified, and optimal parameters of the process along with the effect of selected parameters of the process and the quality of produced parts were determined. The proposed rolling process was verified under laboratory conditions using a flat-wedge forging machine available at the Lublin University of Technology. The experimental findings show a high agreement with the numerical results, in terms of both quality and quantity. The results confirm that ball studs can be produced by the proposed cross wedge rolling technique.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.002
       
  • Heuristics in optimal detailed design of precast road bridges
    • Authors: Victor Yepes; José Vicente Martí; Tatiana García-Segura; Fernando González-Vidosa
      Pages: 738 - 749
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Victor Yepes, José Vicente Martí, Tatiana García-Segura, Fernando González-Vidosa
      This paper deals with the cost optimization of road bridges consisting of concrete slabs prepared in situ and two precast-prestressed U-shaped beams of self-compacting concrete. It shows the efficiency of four heuristic algorithms applied to a problem of 59 discrete variables. The four algorithms are the Descent Local Search (DLS), a threshold accepting algorithm with mutation operation (TAMO), the Genetic Algorithm (GA), and the Memetic Algorithm (MA). The heuristic optimization algorithms are applied to a bridge with a span length of 35m and a width of 12m. A performance analysis is run for the different heuristics, based on a study of Pareto optimal solutions between execution time and efficiency. The best results were obtained with TAMO for a minimum cost of 104184€. Among the key findings of the study, the practical use of these heuristics in real cases stands out. Furthermore, the knowledge gained from the investigation of the algorithms allows a range of values for the design optimization of such structures and pre-dimensioning of the variables to be recommended.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.006
       
  • Benefits of using amorphous metallic fibers in concrete pavement for
           long-term performance
    • Authors: Jun-Mo Yang; Hyun-Oh Shin; Doo-Yeol Yoo
      Pages: 750 - 760
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Jun-Mo Yang, Hyun-Oh Shin, Doo-Yeol Yoo
      This study aims to examine the implications of amorphous metallic fibers on the mechanical and long-term properties of concrete pavement. Two different amounts of amorphous metallic fibers were incorporated into concrete, and plain concrete without fibers was also adopted as comparison. Test results indicated that the overall mechanical properties of concrete were improved by including the fibers, and the improvement increased when a higher amount of fibers was used. In particular, the equivalent flexural strength and flexural strength ratio were substantially improved by incorporating the amorphous metallic fibers. This may enable the thickness of airfield concrete pavement to decrease. The resistance to surface cracking of concrete pavement by repeated wheel loading was also improved with the addition of amorphous metallic fibers. In addition, by adding 5kg/m3 and 10kg/m3 amorphous metallic fibers in concrete pavement, roughly 1.2 times and 3.2 times longer service life was expected, respectively, as compared to their counterpart (plain concrete). Based on a life cycle cost analysis, the use of amorphous metallic fibers in concrete pavement was effective at decreasing the life cycle cost compared to plain concrete pavement, especially for severe traffic conditions.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.010
       
  • Characterization of the cyclic-plastic behaviour of flexible structures by
           applying the Chaboche model
    • Authors: Edoardo Mancini; Daniela Isidori; Marco Sasso; Cristina Cristalli; Dario Amodio; Stefano Lenci
      Pages: 761 - 775
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Edoardo Mancini, Daniela Isidori, Marco Sasso, Cristina Cristalli, Dario Amodio, Stefano Lenci
      During seismic events, the gravity loads may cause a reduction of the lateral stiffness of structures; inelastic deformations combined with horizontal loads (P-Δ effect) can bring to a state of dynamic instability that obviously influences building safety. Especially for flexible structures, the P-Δ effect amplifies structural deformations and resultants stresses, and thus may represent a source of sideway collapse. Since this type of collapse is the result of progressive accumulation of plastic deformation on structural components, the specific objective of this works is to study this effect on a three floor metallic frame (made of aluminium alloy). A non-linear finite element (FE) model of the frame has been developed to study the dynamic non-linear behaviour of the structure, and compare it with the experimental results obtained from a scaled model of the real structure. The FE model, where a simple isotropic hardening behaviour was assumed for the material, was not able to reproduce the real behaviour of the structure. Rather, the correct description of the cyclic plastic behaviour of the material was essential for the numerical analysis of the structure. The characterization of the non-linear behaviour of the material was made by cyclic tension–compression tests on material specimen, from which the coefficients of Chaboche's model were properly calibrated. In this way, the finite element model of the structure provided results in optimum agreement with the experimental ones, and was able to predict the lateral collapse very well.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.003
       
  • Effects of upstream terrain characteristics on aerodynamic coefficients of
           structures
    • Authors: Chitra Ganapathi S; Harikrishna P; Selvi Rajan S
      Pages: 776 - 785
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Chitra Ganapathi S, Harikrishna P, Selvi Rajan S
      Most research investigations and standards have not emphasized the effects of upstream terrain characteristics on aerodynamic coefficients of structures. Hence in this investigation, pressure measurements study on a 1:2:3 rectangular building model has been simulated through wind tunnel test under uniform, open and suburban terrain condition for 0° and 90° angles of wind incidence. From the variation of pressure and force coefficient values of present study, it is seen that the mean pressure and force coefficient values of all levels of uniform flow condition are on higher side by about 15–40% than the open and suburban terrain values for 0° angles of wind incidence as expected. However the mean pressure and force coefficient values of uniform flow condition are also showed that the values of all levels for 90° angle of wind incidence are on lower side with 20–40% difference than the boundary layer flow values when compared to the values of 0° angle of wind incidence. In addition, the mean pressure and force coefficients of present study has been compared with the Indian and international guidelines to highlight the limitations of codal standards.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.005
       
  • New vibroscreen with additional feed elements
    • Authors: Alina Kim; Mikhail Doudkin; Andrey Vavilov; Georgiy Guryanov
      Pages: 786 - 794
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Alina Kim, Mikhail Doudkin, Andrey Vavilov, Georgiy Guryanov
      The article presents research results of the screening process of bulk materials with a new vibroscreen design with additional feed elements. Changes of the traditional screen structure is shown, the use of them increases the screening process efficiency and passage intensity of lower grade of bulk material to the sieve. It is established that the most simple, accessible, effective and efficient way to increase the effectiveness of the screening is the use of additional feed elements. According to the developed mathematical model of cell screening process, numerical studies to identify the effect of process parameters on the screening kinetics carried out. It is proved that the use of additional feed elements has a significant effect on the screening process kinetics and the state evolution of fine particle concentration in the bulk layer. It increases the screening effectiveness by improving the sieve filling and reduces the screening time. It is proved the performance, possibility to use, benefits, efficiency, and prospects for further research of the new vibroscreen scheme with feed elements. Description and results of comparative experimental studies of vibroscreens with different variants of additional bulk material excitation are presented.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.009
       
  • Influence of silica fume content on the quality of bond conditions in
           high-performance concrete specimens
    • Authors: Piotr Dybeł; Kazimierz Furtak
      Pages: 795 - 805
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Piotr Dybeł, Kazimierz Furtak
      The paper presents the analysis of the impact of silica fume content in high-performance concrete (HPC) on bond conditions along the height of tested elements. The tests were performed on the specimens made of six different HPC mixes with varying content of silica fume (0, 5 and 10% by mass of cement) and superplasticizer. The used specimens allowed for determining the changes of bond at individual levels of elements with a total height of 480 and 960mm. The rebars in the elements were placed perpendicularly to the direction of concreting. The reference element, characterised by the parallel orientation to the direction of concreting, was also prepared. The tests indicated that the quality of bond conditions in HPC deteriorates as the distance from the formwork bottom increases. The experiment results indicate that concrete modification with silica fume can both increase and decrease the quality of bond conditions. The influence of silica fume depends on the thickness of the concrete cover, which determines the mechanism of bond failure.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.02.007
       
  • Criticality of self-heating in degradation processes of polymeric
           composites subjected to cyclic loading: A multiphysical approach
    • Authors: Andrzej Katunin; Angelika Wronkowicz; Marcin Bilewicz; Dominik Wachla
      Pages: 806 - 815
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Andrzej Katunin, Angelika Wronkowicz, Marcin Bilewicz, Dominik Wachla
      In this paper, the criticality of the self-heating effect accompanying the fatigue process of polymeric composites is studied by monitoring various physical parameters, which reflects degradation progress in a direct or indirect way. The occurring self-heating effect, resulted from the mechanical energy dissipation due to the viscoelastic nature of a polymeric matrix of composites, under certain loading conditions, may dominate the fatigue process, causing significant intensification of degradation and thermal failure at temperature often higher than the glass-transition temperature. The aim of this study is to determine the critical values of the self-heating temperature, which exceeding results in damage initiation and, in consequence, intensive degradation and failure. Additionally, performed tests enable evaluation of sensitivity of particular techniques as well as obtaining more accurate results with physical justification. Following the obtained results, the critical value of a self-heating temperature, at which domination of the fatigue process by the self-heating effect is observed, is at a level of 65–70°C. Information about the obtained critical values has a great importance both during the design stage of composite structures subjected to cyclic loading as well as their further operation.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.03.003
       
  • Kinetics of static recrystallization in the coarse-grained
           Fe–40at.%Al–Zr–B alloy
    • Authors: Ivo Schindler; Jaromir Kopeček; Petr Kawulok; Magdalena Jabłońska; Eugeniusz Hadasik; Pawel Jóźwik; Petr Opěla; Pawel Hanus; Wojciech Polkowski; Zbigniew Bojar
      Pages: 816 - 826
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Ivo Schindler, Jaromir Kopeček, Petr Kawulok, Magdalena Jabłońska, Eugeniusz Hadasik, Pawel Jóźwik, Petr Opěla, Pawel Hanus, Wojciech Polkowski, Zbigniew Bojar
      The aim of works was to describe mathematically the kinetics of static recrystallization of the alloy type Fe–40at.%Al–Zr–B (with 24.6 Al–0.01 B–0.18 Zr–0.01 C in wt.%) with the coarse-grained structure. The microstructure of the laboratory castings made of this extremely brittle alloy was homogenized by hot rolling of the material in the protective capsules and by the long-term annealing at 1200°C. An initial microstructure with average grain size 0.77±0.27mm was obtained. Based on the isothermal plastic deformation tests and EBSD analysis, the static recrystallization kinetics of the prepared coarse-grained B2 iron aluminide after strain 0.20 was mathematically described. Recrystallized fraction depends on deformation/annealing temperature (900–1100°C) as well as on annealing time. The activation energy of static recrystallization was calculated as 255kJmol−1. Competition between dynamic recovery and static recrystallization was proved after strain 0.35 and annealing temperature 1100°C. Static recrystallization starts relatively easily in the studied alloy, but a very long-term annealing is quite necessary for the complete course of recrystallization. The mean size of recrystallized grains falls with the decreasing annealing temperature (0.47±0.15mm for temperature 1100°C, and 0.22±0.04mm for 900°C). Even at a temperature of 1200°C the annealing after deformation should last approx. 1min for obtaining the fully recrystallized microstructure. That is why the standard hot forming technologies should be combined by an interpass annealing in order to refine sufficiently the coarse grains.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.03.004
       
  • The flow line evolution of hot open ACDR process for titanium alloy discs
    • Authors: Yong Zheng; Dong Liu; Zhe Zhang; Yanhui Yang; Liuji Ren
      Pages: 827 - 838
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Yong Zheng, Dong Liu, Zhe Zhang, Yanhui Yang, Liuji Ren
      Compared with traditional forging of titanium discs, the particular advantage for ACDR (axial closed die rolling) process is saving forming loading, but the weighted coefficient of compression and torsion happened on ACDR process show ambiguous even at the same axial forging ratio. Summed up from previous research, plastic yield process at ACDR forming is not only affected by the main stress caused from axial deformation, but also affected by shear stress from circumferential deformation. Flow line evolution as one of the manifestations, especially the circumferential deformation, should be studied to as basic theory to predict metal flow order, furthermore to define the deformation extent during ACDR process. Thus, this article presents flow line evolution laws with the three directions under different process conditions, emphasizing the difference of flow line evolution at different processing and the influence of process parameters associated with circles number n with the each direction. To achieve this purpose, numerical simulation with the essential boundary condition has been built. By means of systematic studying and discussing among deformation modes (stamping/machining, forging, high-pressure torsion, ACDR forming) and the process parameters (n, η, v, ω), the evolution law of flow line during hot ACDR on titanium alloy discs is achieved.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.03.005
       
  • The influence of superstructure vibrations on operational loads in the
           undercarriage of bulk material handling machine
    • Authors: Damian Pietrusiak; Tadeusz Smolnicki; Mariusz Stanńco
      Pages: 855 - 862
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Damian Pietrusiak, Tadeusz Smolnicki, Mariusz Stanńco
      This article presents research on the correlation between vibrations of the ŁZKS 1600 stacker-reclaimer superstructure and the harmonic changes in loads in undercarriage supports. Investigations are focused on the change in center of gravity location caused by superstructure vibrations and its influence on loads acting on the elements of the undercarriage. The presented research and analysis of results indicate a clear correlation between dynamic behavior of the superstructure and the changes in loads acting on the undercarriage. It was shown that the harmonic nature of the changes in these loads is derived from the global vibrations of the superstructure, which cause a dynamic change in the position of the center of mass.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.03.001
       
  • Waste frying oil modified bitumen usage for sustainable hot mix asphalt
           pavement
    • Authors: Ekinhan Eriskin; Sebnem Karahancer; Serdal Terzi; Mehmet Saltan
      Pages: 863 - 870
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Ekinhan Eriskin, Sebnem Karahancer, Serdal Terzi, Mehmet Saltan
      Asphalt concrete is composed primarily of aggregate and asphalt binder. By volume, a typical Hot Mix Asphalt (HMA) mixture is about 85% aggregate, 10% asphalt binder, and 5% air voids. Bitumen is very important as a binder material in asphalt concrete. However, the cost of the bitumen is relatively high. For this reason, highway professionals are looking for modifiers to decrease the bitumen content used in the asphalt pavement. In this study, waste frying oil (WFO) is used as a modifier to modify the bitumen. As a result, by adding WFO into the bitumen, optimum binder content of a mixture was decreased from 5.125% down to 4.575%. So that, roads constructed with WFO modified bitumen are sustainable because of decreasing the bitumen rate used in the mixture. In addition, softening point of the modified bitumen is decreased (up to 82%) while the penetration value is increased (up to 240%) by modifying the bitumen with WFO. The tensile strength ratios of the modified asphalt specimens are all above the minimum specification limit, 80%. Finally, required temperature for fast self-healing is decreased by modifying the bitumen with WFO. Specimens prepared with WFO modified bitumen are healed compared to the reference specimen.

      PubDate: 2017-04-27T07:44:05Z
      DOI: 10.1016/j.acme.2017.03.006
       
  • Designing a monolithic tip-tilt-piston flexure manipulator
    • Authors: Guangbo Hao; Xiuyun He
      Pages: 871 - 879
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Guangbo Hao, Xiuyun He
      This paper deals with the design of a monolithic tip-tilt-piston flexure manipulator for high-precision applications. The manipulator is first proposed with consideration of actuation isolation, which is a symmetrical and compact design and can be monolithically fabricated without using additive manufacturing. Kinematic and kinetostatic models are then analytically derived for quick parameter assessments. A case study is discussed finally, where a monolithic prototype has been made using CNC milling machining, comparisons among analytical, FEA and testing results are also undertaken.

      PubDate: 2017-05-04T08:12:08Z
      DOI: 10.1016/j.acme.2017.04.003
       
  • Analytical modeling of ground surface topography in monocrystalline
           silicon grinding considering the ductile-regime effect
    • Authors: Hao Nan Li; Tian Biao Yu; Li Da Zhu; Wan Shan Wang
      Pages: 880 - 893
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Hao Nan Li, Tian Biao Yu, Li Da Zhu, Wan Shan Wang
      Grinding process of monocrystalline silicon easily leads to fractured surfaces, therefore an analytical model of the ground silicon surface is presented. In the model, the ductile-regime effect is considered by determining grain-workpiece interaction mode (ductile and brittle modes) at each grinding moment. Validation experiments proved that the model can, to a large extent, describe realistic silicon grinding and predict the machined surfaces in terms of (i) brittle and ductile area, (ii) roughness and waviness, and (iii) potential chipping zone sizes. The model therefore is anticipated to be not only meaningful to guide and optimize the industrial silicon grinding process, but also transferable to other kinds of brittle materials.

      PubDate: 2017-05-04T08:12:08Z
      DOI: 10.1016/j.acme.2017.03.010
       
  • The effect of surface topography on dry fretting in the gross slip regime
    • Authors: Agnieszka Lenart; Paweł Pawlus; Andrzej Dzierwa; Jarosław Sęp; Kazimiera Dudek
      Pages: 894 - 904
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Agnieszka Lenart, Paweł Pawlus, Andrzej Dzierwa, Jarosław Sęp, Kazimiera Dudek
      This paper describes the tribological influence of surface topography on friction and wear under dry fretting gross slip regime in a point contact. Experiments were made using ball-on-disc tribotester in oscillatory motion. 100Cr6 sphere co-acted with a disc made of 42CrMo4 steel. During tests, the friction force was monitored as a function of time. Wear of discs and balls was measured after the tests using white light interferometer. Disc surfaces were prepared by various techniques, including milling, vapour blasting, polishing, lapping and grinding. Initial surface roughness height of discs, determined by the Sq parameter was in the range: 0.01–9μm. During tests, normal load was kept constant at 45N within the contact with frequency of 20Hz. Tests were carried out with different displacement amplitudes: 0.02, 0.05 and 0.075mm. It was found that initial surface roughness height had a significant influence on friction and wear.

      PubDate: 2017-05-04T08:12:08Z
      DOI: 10.1016/j.acme.2017.03.008
       
  • Hydrometallurgical recovery of lead from direct-to-blister copper flash
           smelting slag
    • Authors: Krzysztof Gargul; Bożena Boryczko; Andżelika Bukowska
      Pages: 905 - 911
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Krzysztof Gargul, Bożena Boryczko, Andżelika Bukowska
      Furnace slag from direct-to-blister smelting of copper concentrates contains 12–15% of copper and 2.5–4% of lead. In this form it cannot be deemed as waste material, and thus it is subjected to a high-temperature process of slag decopperization; after this, converting process is performed on the Cu–Pb–Fe alloy being the product of decopperization process in electric furnace. An interesting alternative to the presently used processing of flash smelting slag would be its hydrometallurgical processing and selective recovery of Pb and Cu. This paper presents the results of laboratory tests on flash smelting slag leaching with acetic acid solutions and acetic acid with urea additive. The experiments performed allowed to optimize the process parameters to such an extent that Pb content in the post-leaching sediment is practically equal to the value obtained through the high-temperature process performed in electric furnace.

      PubDate: 2017-05-04T08:12:08Z
      DOI: 10.1016/j.acme.2017.04.004
       
  • Physical and mechanical behavior of granite containing pre-existing holes
           after high temperature treatment
    • Authors: Yan-Hua Huang; Sheng-Qi Yang; Wen-Ling Tian; Jian Zhao; Dan Ma; Chun-Shun Zhang
      Pages: 912 - 925
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Yan-Hua Huang, Sheng-Qi Yang, Wen-Ling Tian, Jian Zhao, Dan Ma, Chun-Shun Zhang
      To understand the high temperature effects on the mechanical and failure behaviors of rock, uniaxial compression tests were carried out on granite specimens containing three pre-existing holes using a rock testing system. Based on the experimental results, the influences of testing temperature on the physical and mechanical parameters of granite were analyzed in detail. An obvious color change of tested granite occurs from gray at room temperature to reddish after 450°C and to red-brown after 900°C high temperature treatment. The granite volume increases, mass decreases and density decreases with increasing testing temperature. As the temperature increases, the peak strength first increases and then decreases, while the elastic modulus decreases. However, the peak strain changes slightly before 450°C, increases dramatically up 450°C. As the bridge angle increases, the mechanical parameters of granite specimens first decrease and then increase. And then, the crack initiation, propagation and coalescence behavior of granite specimens after high temperature exposure was investigated using an acoustic emission (AE) and photography monitoring technique. The cracking process shows that the propagation of crack from the surface of holes leads to the coalescence between adjacent holes. A large AE count and a stress drop are observed during the crack initiation and propagation. The failure modes can be generally classified into three categories: splitting mode, shear mode and mixed mode and they are closely related to heat treatment temperature and bridge angle. Finally, the mechanism causing the differences in the mechanical parameters observed with increasing temperature was discussed based on the SEM observations.

      PubDate: 2017-05-04T08:12:08Z
      DOI: 10.1016/j.acme.2017.03.007
       
  • Nitrogen as an alloying element improving material properties of the high
           carbon cast steel for ball mill liner plates
    • Authors: Józef Gawlik; Jerzy Schmidt; Tomasz Nowak; Zygmunt Wójcicki; Andrzej Zagórski
      Pages: 926 - 934
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Józef Gawlik, Jerzy Schmidt, Tomasz Nowak, Zygmunt Wójcicki, Andrzej Zagórski
      This paper presents an experimental analysis, which was carried out to evaluate the addition of nitrogen as an element complementing a chemical composition used for such cast parts. It has been demonstrated that nitrogen is very advantageous in the process of austenitizing and quenching, improving the stability and homogeneity of the alloy structure. Plates used as a lining of rotary mills operating in cement plants are castings, which acquire their properties mainly through proper heat treatment. Together with an appropriate microstructure and chemical composition, correct heat treatment allow to improve the wear resistance and significantly reduce the abrasive corrosion. Extensive investigations enabled establishing an optimum nitrogen content in the chemical composition of thick-walled castings used in cement industry. Results of experiments, managed for the steel of ledeburate type containing 0.8–1.2% of carbon, have found that the optimal level of nitrogen is in the amount of 0.07–0.10%. The proposed modification helped to reduce the amount of an expensive chromium, increase the hardness of the material (by about 2 HRC to 4 HRC), and to achieve the uniform microstructure and hardness, which noticeably improved the lifetime of the rotary mills plates.

      PubDate: 2017-05-24T07:58:18Z
      DOI: 10.1016/j.acme.2017.04.007
       
  • Analytical investigation of grain size dependence of microhardness in high
           nickel-containing reheated weld metal
    • Authors: Gaojun Mao; Rui Cao; Jianhong Chen; Xili Guo; Yong Jiang
      Pages: 935 - 942
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Gaojun Mao, Rui Cao, Jianhong Chen, Xili Guo, Yong Jiang
      Grain size dependence of microhardness has been addressed in the bainitic reheated weld metals by in situ observation of morphological evolution and characterization of microstructural development. A higher cooling rate promotes the boundary of smaller prior austenite grains to provide more effective sites for primary bainitic ferrite nucleation, yet a lower cooling rate is increasingly beneficial to sympathetic nucleation as well as impingement of secondary bainitic ferrite. The microstructures, obtained by cooling at a higher rate and composed of abundant lath bainite, are closer to the microstructures in the raw weld metal than those cooled at a lower rate, including lath bainite, acicular ferrite and intercritical ferrite. Microhardness is decisive by prior austenite grain size mainly, as well as microstructures. Smaller grains contribute notably to microhardness, and it is worth stressing that the sizes of smaller grains lie on prior austenite grain boundaries rather than the subboundaries generated by intragranular acicular ferrite and intercritical ferrite.

      PubDate: 2017-05-24T07:58:18Z
      DOI: 10.1016/j.acme.2017.04.001
       
  • Development of mathematical model for cyclic behaviour of blind bolted HSS
           column components
    • Authors: Zhi-Yu Wang; Xinsong Yang; Qing-Yuan Wang; Yongjie Liu
      Pages: 943 - 953
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Zhi-Yu Wang, Xinsong Yang, Qing-Yuan Wang, Yongjie Liu
      This paper presents an experimental and finite element analysis based mathematical modelling of cyclic behaviour of the component of hollow structural section (HSS) columns under bolt tensile loads. This component acts as an important constituent part to the blind bolted connections with HSS columns. Two typical failure modes and their related hysteretic curves are examined experimentally. It is shown that force versus displacement curves under monotonic loading can be regarded as the upper bound of the envelope of the counterpart cyclic response. Moreover, the hysteretic force–displacement curves of test columns with relatively thick tube walls demonstrate significant pinching manner thus less energy dissipative capacity. Based on the calibrated finite element model, the flexibility of tube wall and its influences on the connection response are compared for two failure modes. Parametric analyses are also performed to investigate the influence of geometric parameters on the elastic stiffness and yield strength. The mathematical hysteretic models allowing for the behaviour of the connections in two typical failure modes are proposed that distinguishes the developed model from those reported in the literature. It is demonstrated that the proposed model incorporating degradations of stiffness and/or energy dissipation can achieve a good representation of test hysteretic behaviours.

      PubDate: 2017-05-29T09:05:04Z
      DOI: 10.1016/j.acme.2017.03.009
       
  • High dimensional model representation for reliability analyses of complex
           rock–soil slope stability
    • Authors: Giovanna Vessia; Janusz Kozubal; Wojciech Puła
      Pages: 954 - 963
      Abstract: Publication date: September 2017
      Source:Archives of Civil and Mechanical Engineering, Volume 17, Issue 4
      Author(s): Giovanna Vessia, Janusz Kozubal, Wojciech Puła
      The high-dimensional model representation (HDMR) and its modifications, the fractional HDMR (FHDMR) and hybrid HDMR (HHDMR), are new tools for calculating reliability indexes in stability analyses when several variables with large uncertainties are used to describe rock and soil behaviours. Plain HDMR utilises an inverse reliability analysis for the study of unknown design parameters associated with target reliability index values. This approach uses implicit response functions, named limit state functions, according to the response surface method (RSM). In this study, both the FHDMR and HHDMR are applied to the reliability index calculation of safety factors related to the stability analyses of sliding failure mechanisms in complex formations. These two methods improve the computational efficiency of the RSM in reliability index calculations compared to the HDMR. A case study of Carpathian Flysch rock–soil slopes is presented, and the efficiency of the reliability index calculation is estimated by comparing results with ones from neural network application.

      PubDate: 2017-05-29T09:05:04Z
      DOI: 10.1016/j.acme.2017.04.005
       
  • Friction stir processing – State of the art
    • Authors: Marek
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Marek Stanisław Węglowski
      Increasing demands for operating properties of fabricated elements on one hand, and a necessity of reducing mass of a structure on the other, triggers materials engineering research into producing surface layers representing required functional properties. Methods commonly used in the production of surface layers, such as surfacing, spraying or re-melting with a laser beam have been known for years. A new method is the friction stir processing (FSP) of surface layers. The FSP process is primarily used for the modification of microstructure in near-surface layers of processed metallic components. In particular, the process may produce: fine grained structure, surface composite, microstructural modification of cast alloys, alloying with specific elements, improvement of welded joints quality. The chapter is composed of a few main parts. In the first part, based on literature review the main application and achievements of FSP processes are presented. In the second part: analysis of the process. The third part is focused on microstructure refinement and the last part provide information about friction stir alloying as well as friction stir processing with ultrasonic vibration.

      PubDate: 2017-07-19T21:28:15Z
       
 
 
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