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  Subjects -> ENGINEERING (Total: 2431 journals)
    - CHEMICAL ENGINEERING (210 journals)
    - CIVIL ENGINEERING (203 journals)
    - ELECTRICAL ENGINEERING (112 journals)
    - ENGINEERING (1271 journals)
    - ENGINEERING MECHANICS AND MATERIALS (402 journals)
    - HYDRAULIC ENGINEERING (57 journals)
    - INDUSTRIAL ENGINEERING (77 journals)
    - MECHANICAL ENGINEERING (99 journals)

CIVIL ENGINEERING (203 journals)                  1 2 | Last

Showing 1 - 200 of 203 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 20)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 39)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 32)
Agregat     Open Access   (Followers: 1)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 34)
Architectural Engineering     Open Access   (Followers: 5)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 3)
Archives of Civil Engineering     Open Access   (Followers: 12)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 2)
ATBU Journal of Environmental Technology     Open Access   (Followers: 4)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 6)
Baltic Journal of Road and Bridge Engineering     Open Access   (Followers: 1)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 10)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 2)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 14)
Building & Management     Open Access   (Followers: 1)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 14)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 13)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 11)
Case Studies in Structural Engineering     Open Access   (Followers: 9)
Cement and Concrete Composites     Hybrid Journal   (Followers: 20)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 3)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 6)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 8)
Civil And Environmental Engineering Reports     Open Access   (Followers: 7)
Civil and Environmental Research     Open Access   (Followers: 17)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 22)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 12)
Civil Engineering Dimension     Open Access   (Followers: 10)
Civil Engineering Infrastructures Journal     Open Access   (Followers: 1)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 282)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 11)
Computers & Structures     Hybrid Journal   (Followers: 38)
Concrete Research Letters     Open Access   (Followers: 7)
Construction Economics and Building     Open Access   (Followers: 4)
Construction Engineering     Open Access   (Followers: 11)
Construction Management and Economics     Hybrid Journal   (Followers: 21)
Construction Science     Open Access   (Followers: 5)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 3)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 17)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Open Access   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 10)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 9)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 18)
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 3)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 7)
GISAP : Technical Sciences, Construction and Architecture     Open Access  
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indonesian Journal of Urban and Environmental Technology     Open Access  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 3)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 30)
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: 17)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 2)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 15)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 10)
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: 6)
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: 8)
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: 5)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 7)
International Journal Sustainable Construction & Design     Open Access   (Followers: 1)
Journal of Applied Research in Water and Wastewater     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 14)
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     Open Access  
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 15)
Journal of Civil Engineering and Management     Open Access   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 9)
Journal of Civil Engineering Research     Open Access   (Followers: 7)
Journal of Civil Engineering, Science and Technology     Open Access   (Followers: 1)
Journal of Civil Society     Hybrid Journal   (Followers: 5)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites     Open Access   (Followers: 78)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 23)
Journal of Construction Engineering     Open Access   (Followers: 9)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 18)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 6)
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: 10)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 14)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 19)
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: 5)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 8)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 9)
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 3)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 6)
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: 36)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Structural Mechanics     Open Access  
Journal of Structures     Open Access   (Followers: 4)
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 1)
Journal of the Civil Engineering Forum     Open Access  
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 2)
Journal of Water and Environmental Nanotechnology     Open Access  
Journal of Water and Wastewater / Ab va Fazilab     Open Access  
Jurnal Spektran     Open Access   (Followers: 1)
Jurnal Teknik Sipil     Open Access  
Jurnal Teknik Sipil dan Perencanaan     Open Access   (Followers: 1)
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   (Followers: 1)
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 4)
Media Komunikasi Teknik Sipil     Open Access  
Mokslas – Lietuvos ateitis / Science – Future of Lithuania     Open Access  
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 15)
npj Materials Degradation     Open Access  
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 9)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 3)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 14)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 9)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 2)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 3)
Promet : Traffic &Transportation     Open Access  
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Recent Trends In Civil Engineering & Technology     Full-text available via subscription   (Followers: 5)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 6)
Resilience     Open Access   (Followers: 1)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 11)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 5)
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: 5)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 11)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 8)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Mechanics of Engineering Constructions and Buildings     Open Access   (Followers: 1)
Structural Safety     Hybrid Journal   (Followers: 6)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 24)
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: 10)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access   (Followers: 1)
Teknik     Open Access  
Territorium : Revista Portuguesa de riscos, prevenção e segurança     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: 5)
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)

        1 2 | Last

Journal Cover
Archives of Civil and Mechanical Engineering
Journal Prestige (SJR): 0.982
Citation Impact (citeScore): 3
Number of Followers: 3  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 1644-9665
Published by Elsevier Homepage  [3162 journals]
  • Calibration of constitutive equations under conditions of large strains
           and stress triaxiality
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Andrzej Neimitz, Jaroslaw Galkiewicz, Ihor Dzioba Constitutive equations were calibrated to improve their application in assessing a stress field in front of a crack under the conditions of large strains and stress triaxiality. The Bai–Wierzbicki method was adopted, and certain changes and new terms were introduced to incorporate material softening. Five shapes of specimens were tested to cover a wide range of stress triaxiality conditions and Lode factors. Tests were performed at three different temperatures, namely, +20 °C, –20 °C, and –50 °C, and on three different materials obtained by three different heat treatments of S355JR steel.
       
  • Visualization study of the flow processes and phenomena in the external
           gear pump
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): P. Antoniak, J. Stryczek External gear pumps make some of the most frequently used hydraulic energy generators. In spite of the fact that those well known machines feature good operational parameters, the research and development work on the pumps is still going on. There is a number of various research methods applied. One of them, an experimental method, is a visualization study, on which this paper is focused.In this article, the visualization research method has been presented, which has been used for the study of the flow processes and phenomena in the external gear pump. Findings of the research enabled a detailed description of the flow process, namely of the transporting of the working fluid through the pump, in each of the typical zones of the pump. It turns out that a characteristic feature of the process is the occurrence of various cavitation phenomena. All characteristic cavitation forms, as well as the degrees of their intensity, observed during the research, have been catalogued and specifically described. The research also made it possible to identify the critical areas of the pump, which, consequently, allowed the development of specific design, construction and operational recommendations. A result of applying those recommendations was a considerable reduction of the intensity of the cavitation phenomena, evidence of which is the experimental study presented in this paper.
       
  • Evaluation of pre-treatment efficiency on sugarcane bagasse fibers for the
           production of cement composites
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Matheus R. Cabral, Erika Y. Nakanishi, Valdemir dos Santos, Joahnn H. Palacios, Stéphane Godbout, Holmer Savastano Junior, Juliano Fiorelli In the present study, physical, chemical, morphological, crystallographic analysis of the non-treated and treated (100 °C during 30 min) sugarcane bagasse fibers were examined. Sugarcane bagasse fibers pre-treatment effect on the Portland cement hydration was monitored by inhibition tests and differential scanning calorimetry in the first 24 h. Furthermore, 28 days age physical-mechanical properties of cement composite materials with sugarcane bagasse fibers were also evaluated. Inhibition index of treated sugarcane bagasse fibers was 5.9%, while for the non-treated sugarcane bagasse fibers it was 67.3%. Cement composites containing treated sugarcane bagasse fibers showed lower physical properties (water absorption and thickness swelling) than the cement composites reinforced with non-treated sugarcane bagasse fibers (p 
       
  • Durability analysis of forging tools after different variants of surface
           treatment using a decision-support system based on artificial neural
           networks
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Barbara Mrzygłód, Marek Hawryluk, Zbigniew Gronostajski, Andrzej Opaliński, Marcin Kaszuba, Sławomir Polak, Paweł Widomski, Jacek Ziemba, Maciej Zwierzchowski This article concerns a decision-support system based on artificial neural networks (ANN) enabling analysis and forecasting of the durability of forging tools used in the hot forging process of a cover forging – a sealing element of the driveshaft in road freight vehicles. The process of knowledge acquisition, adopted neural network architecture and parameters of the developed network are presented. In addition, 3 variants of a hybrid layer (gas nitrided layer GN + PVD coating) were applied to the selected tools (punches applied in the 2nd top forging operation): GN/AlCrTiN, GN/AlCrTiSiN, and GN/CrN, in order to improve durability, and the resultant tools were also compared to standard tools (with only gas nitriding) and regenerated tools (after repair welding regeneration). The indispensable knowledge about the durability of selected forging tools (after various surface engineering variants), required for the process of learning, testing and validation for various neural network architectures was obtained from comprehensive, multi-year studies. These studies covered, among other things: operational observation of the forging process, macroscopic analysis combined with scanning of tools’ working surfaces, microhardness measurements, microstructural analysis and numerical modeling of the forging process. The developed machine-learning dataset was a collection of approx. 900 knowledge records. The input (independent) variables were: number of forgings manufactures, pressing forces, temperature on selected tool surfaces, friction path and type of protective layer applied to tool. Meanwhile, output (dependent) variables were: geometrical loss of tool material and percentage share of the four main destructive mechanisms. Obtained results indicate the validity of employing ANN-based IT tools to build decision-support systems for the purpose of analyzing and forecasting the durability of forging tools.
       
  • Microstructural characterization of cellulose fibres in reinforced cement
           boards
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Krzysztof Schabowicz, Daria Jóźwiak-Niedźwiedzka, Zbigniew Ranachowski, Stanislav Kudela, Tomas Dvorak The microscopic analysis of the different cellulose fibre cement composites is presented. The observations of the fibres in optical microscope in transmitted light and in scanning electron microscope are described. The micro computed tomography (micro-CT) and SEM were used to determine the distribution of the fibres in the matrix. The investigated fibre cement boards were produced by extrusion process and panels were cured in natural conditions. The main goal of the research was application of different microscopic methods to analyze the fibres distribution as a result of a different methods of their production. Micro-CT was used for 3D visualization of fibres distribution in three different fibre cement boards. It was possible to determine the average diameter of the fibres and their concentration using the high-resolution mode of micro-CT scanning procedure. Finally, a procedure which can be applied as a useful tool for analysis of the different procedures used in production of fibre cement boards is described. This procedure can be successfully used in the quality control system of cellulose fibre distribution in cement composites.
       
  • Instabilities in membrane tension: Parametric study for large strain
           thermoplasticity
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Marzena Mucha, Balbina Wcisło, Jerzy Pamin, Katarzyna Kowalczyk-Gajewska This paper deals with the numerical analysis of localized deformation for a rectangular plate in membrane tension, modelled with large strain thermoplasticity. The aim is to determine the influence of selected factors on the localization phenomena, which can result from geometrical, material, and thermal softening. Two types of boundary conditions are considered: plane stress and plane strain, as well as two yield functions, Huber–Mises–Hencky and Burzyński–Drucker–Prager, with selected values of friction angle. First, isothermal conditions are considered and next, a conductive case with thermal softening is studied. Moreover, three types of plastic behaviour are analysed: strain hardening (with different values of hardening modulus), ideal plasticity, and strain softening. Numerical tests, performed using AceGen/FEM packages, are carried out for the rectangular plate under tension with an imperfection, using three finite element discretizations. The results for plane strain in the isothermal model show that with the decrease of linear hardening modulus, we can observe stronger mesh sensitivity, while for plane stress, mesh sensitivity is visible for all cases. Furthermore, for the thermomechanical model the results also depend on the mesh density due to insufficient heat conduction regularization.
       
  • Microwave and spark plasma sintering of carbon nanotube and graphene
           reinforced aluminum matrix composite
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Ehsan Ghasali, Parvaneh Sangpour, Alireza Jam, Hosein Rajaei, Kamyar Shirvanimoghaddam, Touradj Ebadzadeh Graphene and carbon nanotube due to their outstanding mechanical performance were used as reinforcement in aluminum (Al) based composite through spark plasma sintering (SPS), microwave (MW) and conventional techniques. The initial compositions of Al-1 wt% CNT, Al-1 wt% GNP and Al-1 wt% CNT–1 wt% GNP were mixed by a high energy ultrasonic device and mixer mill to achieve homogenous dispersion. The SPS, MW and conventional processes were conducted at almost 450, 600 and 700 °C, respectively. The maximum relative density (99.7 ± 0.2% of theoretical density) and bending strength (337 ± 11 MPa) obtained by SPS, while maximum microhardness of 221 ± 11 Vickers achieved by microwave for Al-1 wt% CNT–1 wt% GNP hybrid composite. X-ray diffraction (XRD) examinations identified Al as the only dominant phase accompanied by very low intensity peaks of Al4C3. Field emission scanning electron microscopy (FESEM) micrographs demonstrated uniform distribution of GNP as well as CNT reinforcement in spark plasma sintered samples.
       
  • Introduction and seismic performance investigation of the proposed lateral
           bracing system called “OGrid”
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Maryam Boostani, Omid Rezaifar, Majid Gholhaki In this paper proposed bracing systems for earthquake resistant steel structures are introduced and studied through an experimental program and FEM (finite element method) numerical analysis. These proposed bracing systems called OGrid, by two types as the OGrid-I and the OGrid-H, are braced frames with circular braces connected to MRF (moment resisting frame) with joint connections. Linear and nonlinear behavior of the new OGrid bracing systems are studied and compared with X-bracing system, and MRF in one story base models. To achieve the linear and nonlinear behavior of models, response spectrum analysis and nonlinear static (pushover) analysis are used by FEM. Results showed that new OGrid bracing systems have appropriate vibration period, elastic stiffness and displacement. Absorbed energy of the proposed OGrid-I and OGrid-H bracing systems in comparison with MRF is 1.74 times and in comparison with X-bracing system is 34.8 times. The OGrid-I and OGrid-H bracing systems have more ductility and have great distance between relative deformation of the structure in yield strength level and the maximum relative deformation of structure after entering the plastic region, which cause to dissipate much lateral loads, and there is a great distance between first hinge formation and the moment that structure collapses.
       
  • Synthesis, microstructure and mechanical properties of bronze–molybdenum
           composites processed via LPS and SPS methods
    • Abstract: Publication date: September 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 4Author(s): Sina Memari, Mohammad Ardestani, Alireza Abbasi In this work, synthesis, densification and properties of bronze–70 wt% Mo and bronze–30 wt% Mo composite powders were investigated. The composite powders were prepared by mechanical milling of bronze–Mo powder mixtures for 16 h. The results of cold compressibility investigations showed that Heckel and Ge equations provided the best fit scenario for bronze–70 wt% Mo and bronze–30 wt% Mo, respectively. The composite powders were consolidated via pressureless and spark plasma sintering processes. The relative densities of spark plasma sintered samples with 30 and 70 wt% molybdenum were about 98%. However, the relative density of bronze–70 wt% Mo and bronze–30 wt% Mo pressureless sintered samples were 97.1 and 94.3%, respectively. The scanning electron microscopy observations revealed that the size and dispersion of Mo particles within the bronze matrix in the pressureless sintered samples was completely different from that of the spark plasma sintered ones. Furthermore, it was found that in spite of nearly close relative densities, the hardness and flexural strength of the spark plasma sintered samples were higher than that of the pressureless sintered ones which was due to different shape, size and dispersion of the Mo particles within the matrix phase in the different samples. According to the results, the preferred densification process was SPS method.
       
  • A comparative study of transverse shrinkage stresses and residual stresses
           in P91 welded pipe including plasticity error
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Chandan Pandey, Manas Mohan Mahapatra, Pradeep Kumar The paper deals with the measurement of the residual stresses in P91 welded pipe using the blind hole drilling technique. The P91 pipe weld joints were prepared using gas tungsten arc welding process. The residual stress measurement was carried out using the strain gauge rosette that was associated with the plastic deformation of material and stress concentration effect of multi-point cutting tool. Strain gauge response was estimated experimentally using the tensile testing for the uniaxial loading while finite element analysis was performed for biaxial loading. Gas tungsten arc welds joint was prepared for conventional V-groove and narrow groove design. The corrective formulation was developed for calculating the corrected value of residual stresses from the experimentally obtained strain value. The corrected and experimental induced residual stresses values as per ASTM E837-13 were calculated for both V-groove and narrow groove design. Post weld heat treatment (PWHT) of P91 welded pipe was also conducted to study their effect on residual stresses.
       
  • Innovative design of non-backlash worm gear drives
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Wojciech Kacalak, Maciej Majewski, Zbigniew Budniak In this paper the authors present the newest designs of worm gear drives which allow to adjust or decrease the amount of backlash. This effect is achieved with innovative designs of worms and worm wheels. The designed drives are aimed to find their application in systems for precise positioning of measurement assemblies, precise drives of technological instrumentation, as well as in micro-mechanisms. Many of the presented designs allow backlash adjustment without removing of the worm gear drive. The described solutions present a good alternative to conventional high-gear precision drives as well as harmonic drives used at speeds typical to positioning mechanisms.This paper presents the results of numerical research performed with the MES finite element method and also the results of experimental research on the innovative worm gear drive with an axially adaptive worm. The results analysis has led to the conclusion, that the described solutions allow reduction of backlash to 5–15%, and even greater reduction of its standard deviation – that is 5–10% – of their initial values.
       
  • Prediction of site overhead costs with the use of artificial neural
           network based model
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Agnieszka Leśniak, Michał Juszczyk Overheads, especially site overhead costs, constitute a significant component of a contractor's budget in a construction project. The estimation of site overhead costs based on traditional approach is either accurate but time consuming (in case of the use of detailed analytical methods) or fast but inaccurate (in case of the use of index methods). The aim of the research presented in this paper was to develop an alternative model which allows fast and reliable estimation of site overhead costs. The paper presents the results of the authors’ work on development of a regression model, based on artificial neural networks, that enables prediction of the site overhead cost index, which used in conjunction with other cost data, allows to estimate site overhead costs. To develop the model, a database including 143 cases of completed construction projects was used. The modelling involved a number of artificial neural networks of the multilayer perceptrons type, each with varying structures, activation functions and training algorithms. The neural network selected to be the core of developed model allows the prediction of the costs’ index and aids in the estimation of the site overhead costs in the early stages of a construction project with satisfactory precision.
       
  • Analytical solutions for flexure of rectangular orthotropic plates with
           opposite rotationally restrained and free edges
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Sigong Zhang, Lei Xu The problem of flexural characteristics of rectangular orthotropic thin plates with opposite rotationally restrained and free edges subjected to arbitrary transverse loads is investigated in present study. By introducing a rotational fixity factor to simulate the elastic rotation restraint at plate edges, the finite integral transform method is employed to obtain exact analytical solution of the problem. Numerical solutions for rectangular plates with various aspect ratios and edge flexibility are investigated and compared to the results reported in previous research. The accuracy and convergence of the present formulation are assessed by comparing with previously reported results. The excellent agreement on the results between the proposed method and previous studies indicates that the proposed method is accurate and effective.
       
  • Experimental investigations of load-bearing capacity of composite
           timber-glass I-beams
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Kazimierz Furtak, Konrad Rodacki This article discusses the load-bearing capacity of composite timber-glass I-beams, which are interesting alternative beams of ceilings and roofs. The reasoning behind the use of timber-glass I-beams is the combination of the best features of both materials – this enables the creation of particularly safe beams with regard to structural stability and post-breakage load capacity. The article is focused on the post-breakage capacity of composite timber-glass I-beams subjected to quasi static bending load and multi-variable bending load. The main purpose of such scope of work was to show the influence of multi-variable loading on the composite timber-glass I-beams.
       
  • The role of powder layer thickness on the quality of SLM printed parts
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Q.B. Nguyen, D.N. Luu, S.M.L. Nai, Z. Zhu, Z. Chen, J. Wei Achieving good mechanical properties as well as the dimensional accuracy and the smooth surface quality of selective laser melting printed parts with minimal post treatments are essential in additive manufacturing. In the present study, Inconel 718 samples with different powder layer thickness (20, 30, 40 and 50 μm) were additively fabricated using 3D Systems ProX-300 machine. The results reveal that the lower the layer thickness, the denser and good dimensional accuracy were achieved. Marginally higher mechanical properties and microhardness were also obtained at the lower thickness while the failure strain was still high. This can be explained through significant change in the microstructure due to different cooling rate and thermal cycles. In addition, the formation of ɤ′ and ɤ″ intermetallic phases, which were well distributed in the matrix and grain boundaries, during heating/cooling, gave rise in the strengths. Fractography shows the plastic deformation band due to work hardening and the crack initiation sites at sub-micro/micro pores, lack of fusion areas and the boundary of unmelted particles. The study would guide engineers balance their options between the production rate and the building parts’ quality.
       
  • Comparative assessment of the corrosion process of orthodontic archwires
           made of stainless steel, titanium–molybdenum and nickel–titanium
           alloys
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Konrad Małkiewicz, Mariola Sztogryn, Marcin Mikulewicz, Andrzej Wielgus, Janusz Kamiński, Tadeusz Wierzchoń The phenomenon of corrosion of orthodontic appliances is of interest to both clinicians and researchers dealing with the issue of biocompatibility of medical materials. The oral cavity, due to its temperature fluctuations, changing pH, high humidity, action of mechanical forces and the presence of microorganisms is a favorable environment for degradation of dental materials. This article presents the comparative assessment of the intensity of corrosion of orthodontic archwires made of alloy steel, nickel–titanium and titanium–molybdenum alloys in laboratory conditions. Corrosion resistance examinations were carried out by means of the impedance and the potentiodynamic methods using an Autolab PGSTAT100 potentiostat/galwanostat (Eco Chemie B.V., Holand) with FRA2 module, in non-deaerated artificial saliva solution at 37 °C. An analysis of the impendence method's data showing that the highest corrosion resistance is observed for NiTi arches (3M, USA), while the lowest resistance for SS arches (3M, USA). These observations were confirmed by the data obtained from potentiodynamic tests; it was observed that the average corrosion current density [Icor] was the lowest for nickel–titanium archwires (3M, USA) and averaged 2.50 × 10−3 μA/cm2. The highest Icor corrosion current was observed in the case of steel wires from the same manufacturer and averaged 4.96 × 10−2 μA/cm2.
       
  • Research on tool wear based on multi-scale simulation in high speed
           cutting Inconel718
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Yi-Hang Fan, Tao Wang, Zhao-Peng Hao, He Lan, Rui-Rui Cui Nickel-based superalloy Inconel718 has excellent properties such as good fatigue resistance, creep resistance, oxidation resistance and corrosion resistance. It has been widely used in aerospace industry. However, nickel-based superalloy is a kind of typical difficult-to process-material. The alloying elements which enhanced material exist in the form of high hardness compound (TiC, NbC and other interphase hard point). These high hardness compounds led to complicate cutting deformation, high cutting temperature, large cutting force and severe tool wear. According to the characteristics in cutting Inconel718 and the microstructure of cemented carbide tool, the wear properties and mechanism of carbide tool in cutting Inconel718 process are revealed by multi-scale analysis method. The main wear forms that wear debris peeled from the tool substrate are given and the evolution mechanism of tool wear caused by the crack in the cutting process is deeply studied.
       
  • Dynamic compressive mechanical behaviour and modelling of
           basalt–polypropylene fibre-reinforced concrete
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Qiang Fu, Ditao Niu, Jian Zhang, Daguan Huang, Yan Wang, Mengshu Hong, Lu Zhang Dynamic compressive behaviour of basalt–polypropylene fibre-reinforced concrete (BPFRC) was experimentally investigated using a 75-mm-diameter split-Hopkinson pressure bar. The results showed that the addition of basalt fibre (BF) and polypropylene fibre (PF) is effective at improving the impact-resistance behaviour of concrete. The dynamic compressive strength, critical strain, and energy absorption capacity of BPFRC increased with increasing strain rate. At strain rates of 20–140 s−1, the addition of BF and PF significantly increased the dynamic compressive strength, critical strain, and energy absorption capacity of concrete. The dynamic increase factor of BPFRC increased linearly with the decimal logarithm of strain rate. The hybrid addition of BF and PF significantly improved the strain rate effect of the dynamic compressive strength. The strengthening and toughening mechanisms of BF and PF are discussed in detail. The proposed dynamic damage constitutive model can be used to accurately describe the dynamic stress–strain relationship of BPFRC.
       
  • Load-carrying capacity of axially loaded concrete-filled steel tubular
           columns made of thin tubes
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Marcin Abramski An experimental investigation was conducted on 30 CFST columns. An influence of the following factors on load-carrying capacity of the investigated columns was analyzed: the column slenderness (λ1 = 42, λ2 = 27 and λ3 = 15), the tube thickness (the reinforcement ratio was equal to 4% or 6%), the way of applying the load to CFST columns (through the concrete core or through the entire cross-section), the bond strength between a steel tube and a concrete core.The results of the experimental investigation let the author derive a practical method of determining load-bearing capacity of CFST columns. The Eurocode 4 provisions regulating composite steel and concrete structures design impose the minimum share of a steel tube in the cross-sectional area of a CFST column. This minimum share is the prerequisite for the Eurocode 4 to be applicable. It ranges from 0.5% to 6%. As the experimental research presented in the paper indicate, the CFST columns of such low reinforcement ratios can be also effective in carrying loads. The proposed method is a second order analysis based on stiffness, similarly as the calculation procedure for the ordinary reinforced concrete columns which is used in Eurocode 2. The experimental results prove the author's suggestion to be correct.
       
  • Numerical simulation and experimental investigations on TA1 titanium alloy
           rivet in electromagnetic riveting
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Xu Zhang, Maoyun Zhang, Liqiang Sun, Chunfeng Li In this work, an electromagnetic-mechanical-thermal coupling numerical model was proposed and electromagnetic riveting (EMR) experiments were performed using Φ6 mm TA1 titanium alloy rivets. Experimental verification showed that the proposed model could be suitable for predicting the EMR process, and the corresponding relationships among magnetic pressures, deformations of rivet tails and discharge voltages were revealed. In addition, simulation results presented that most deformations occurred in the locally upsetting stage of rivet tail. The maximum temperature rise reached up to 426 °C within the shear deformation zone of rivet tail. The rivet tails with high speed deformations could bear 9.9 kN shear loads and 12.5 kN pull-out loads, respectively. The EMR joining structures with multi-layered sheets had very high interference-fit qualities, and the average relative interferences were 2.5–3.0% for as-received multi-layered structures. Consequently, the EMR process can be used for difficult-to-deformation material rivets under the high efficiency, high quality and ambient temperature.
       
  • Study on properties of self-compacting concrete modified with
           nanoparticles
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Paweł Niewiadomski, Jerzy Hoła, Andrzej Ćwirzeń The paper presents the results of studies of a total of 11 series of self-compacting concrete, which were modified with different amounts of the following nanoparticle additives: SiO2, TiO2 and Al2O3, and also a reference concrete without the addition of nanoparticles. The study included the rheological properties of concrete mixes and the physical and mechanical properties of a hardened self-compacting concrete. The characteristics of air pores obtained using a computer image analyser and analysis of a microstructure with the use of a computer microtomograph are also presented. The paper contains the results of tests of compressive strength, flexural strength, hardness and elastic modulus, which were obtained using the nanoindentation technique. The obtained results were analyzed and commented on.
       
  • Structural performance of concrete poles used in electric power
           distribution network
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Mehran Zeynalian, Mehrdad Zamani Khorasgani This paper presents an experimental study on structural performance of concrete poles used in electric power distribution network (EPDN). Three full scale 12-m concrete poles were tested; and a numerical study on a 7-span distribution line was also carried out in order to investigate lateral behavior of the network under severe weather conditions, as it is believed EPDN has a vital role on sustainability of power transmission from the power planet to the consumers which might be hundreds kilometers far away. One of the main issues in EPDN is concrete poles’ collapse under simultaneous wind and ice loads in some unreachable snow covered areas. However, the results show that the prescribed loading regimes by standards do not induce any damage into the distribution network nevertheless some unforeseen loads like gust wind load in heavy weather conditions cause the poles’ failure. Therefore, a non-linear pushover analysis was carried out to find out the weakest part of the distribution network; and finally some suggestions for increasing the EPDN's sustainability are made.
       
  • Experimental and analytical research on relationship between tool life and
           vibration in cutting process
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Siamak Ghorbani, Vladimir V. Kopilov, Nikolay I. Polushin, Vladimir A. Rogov New identification and evaluation techniques for machining systems lead to an increase in the efficiency of a production system. This paper presents relationship between tool life, design features, fatigue strength and parameters of vibrations. To cope with this objective, vibration influence on tool wear is assessed, which considers the phase shift of vibration in different coordinates and forces on rake and rear faces of the tool. Tool life is predicted based on fatigue strength of tool material and parameters of tool vibrations. Static and dynamic characteristics of cutting tools during different machining conditions are analyzed using different cutting tools. Test results of cutting tools with different clamping types during static, dynamic and cutting processes, together with the simulation results suggest a relationship between the characteristics of the tool, the elastic system vibrations and tool life.
       
  • Collapse mechanism analysis of a steel moment frame based on structural
           vulnerability theory
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Ye Jihong, Jiang Liqiang This paper presents an improved method to analyze the collapse mechanism of steel moment frames based on structural vulnerability theory (SVT), in which the failure processes of the essential components are defined according to the damage characteristics of their ductile and brittle members. The improved method can accurately identify possible collapse modes of steel moment frames, because the transformation processes of such connections as beam-column joints and support joints from rigid connections to pinned ones were considered. Structural vulnerability analysis is performed on a 4-story steel frame structure by using the improved method, the results show that the collapse caused by joint failure in the first story had the maximum vulnerability index, so that the weakness of the steel frame may be located in the first story; while the collapse behaving as a “beam plastic hinge” failure, as an expected failure mode, had the minimum value. Moreover, the improved method was validated by a shaking table test due to the consistence between the experimental results and the collapse modes calculated to have the maximum vulnerability index, which demonstrates that such improved method could be effectively to predict the collapse modes of steel frame structures.
       
  • A new mixed-field theory for bending and vibration analysis of
           multi-layered composite plate
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): M. Lezgy-Nazargah, S. Salahshuran A novel mixed-field theory with relatively low number of unknown variables is introduced for bending and vibration analysis of multi-layered composite plates. The presented plate theory is derived from a parametrized mixed variational principle which is introduced recently by the first author. A global-local kinematic with a layer-independent number of variables is assumed for the description of the displacements of the plate. The considered kinematic stratifies the displacement and transverse stress continuity conditions at the mutual interfaces of the layers. It also fulfill the homogenous boundary conditions of the shear stresses on the upper/lower surfaces of the plates without using the shear correction factor. One-unknown variable fields which satisfy a priori the continuity conditions at the adjacent interfaces between layers and the zero boundary conditions on the bounding surfaces are considered for the approximation of the transverse shear stresses. The transverse normal stress along the total thickness of the multi-layered plate is approximated via a quadratic polynomial. The presented mixed-field plate theory has been validated through comparison of the bending and vibration analysis results with those obtained from the three-dimensional (3D) theory of elasticity and the results of the other classical and high-order plate theories.
       
  • Machining parameter optimization for EDM machining of Mg–RE–Zn–Zr
           alloy using multi-objective Passing Vehicle Search algorithm
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Sohil Parsana, Nishil Radadia, Mohak Sheth, Nisarg Sheth, Vimal Savsani, N. Eswara Prasad, T. Ramprabhu Mg alloys are known for their specific strength, stiffness, damping capacity, EMI shielding. Particularly, Rare earths added Mg alloys find applications in the gear box casing, transmission housing, engine mount, ribs, frames, instrument panels due to their improved corrosion resistance, pressure tightness, specific strength and creep strength. Reemergence of Mg alloys in the aircraft structural applications demands for advanced machining processes such as EDM to fabricate complex geometry parts. In this study, parametric multi-objective optimization of EDM on Mg–RE–Zn–Zr alloy is carried out using the novel meta-heuristic algorithm – Passing Vehicle Search (PVS). The input parameters considered are pulse-on (Ton), pulse-off (Toff) and peak current (A). Response surface method (RSM) is implemented through the Box–Behnken design to formulate a mathematical model for Material Removal Rate (MRR), Tool Wear Rate (TWR) and Roundness of holes. The accuracy of theoretical model has been established using the confirmation runs. Using the weighted sum method, the multi-objective PVS calculated optimal solutions for different weights to generate 2-D and surface pareto fronts. These pareto fronts were evaluated for performance determination of PVS using novel and established metrics such as spacing, spreading, hypervolume and pure diversity. The values of performance metrics indicate acceptable nature of the graphs and such analysis would facilitate better comparisons of solutions to select algorithms for optimization. Finally, decision making is illustrated with the help of level diagrams to draw up practical inferences for designing production plans and providing the best choice of machining parameters according to their preferences.
       
  • Failure characteristics of jointed rock-like material containing
           multi-joints under a compressive-shear test: Experimental and numerical
           analyses
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): R.H. Cao, P. Cao, H. Lin, G.W. Ma, C.Y. Zhang, C. Jiang Extensive efforts have been made to gain a better understanding of the failure behaviour of rocks and rock-like materials, but crack propagation and failure processes under compressive-shear loading have not yet been comprehensively investigated. To address this area of research, the peak shear strengths (τ) and failure processes of specimens with multiple joints are studied by lab testing and particle flow code (PFC2D). Four types of failure modes are observed: (a) shear failure through a plane (Mode-I), (b) intact shear failure (Mode-II), (c) oblique shear crack connection failure (Mode-III), and (d) stepped path failure (Mode-IV). The failure mode gradually transformed to Mode-III as α (joint inclination angle) increases from 0° to 90° in the specimens. In addition, with increasing joint distance (d) in the specimens, the failure mode changes to Mode-II. As the non-overlapping length between joints (c) in the specimens increases, the failure mode changes to Mode-IV. The joint geometry has a major influence on the shear strength of the jointed specimens. The peak shear strength of specimens with different joint inclination angles is obtained when α = 45°. Additionally, the peak shear strength increases as the joint distance (d) and non-overlapping length (c) increase.
       
  • On spectral representation method and Karhunen–Loève expansion in
           modelling construction material properties
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Elton J. Chen, Lieyun Ding, Yong Liu, Xianfeng Ma, Miroslaw J. Skibniewski Randomness in construction material properties (e.g. Young's modulus) can be simulated by stationary random processes or random fields. To check the stationarity of commonly used techniques, three random process generation methods were considered: Xn(t), Yn(t), and Zn(t). Methods Xn(t) and Yn(t) are based on a truncation of the spectral representation method with the first n terms. Xn(t) has random amplitudes while Yn(t) has random harmonics phases. Method Zn(t) is based on the Karhunen–Loève expansion with the first n terms as well. The effects of the truncation technique on the mean-square error, covariance function, and scale of fluctuation were examined in this study; these three methods were shown to have biased estimations of variance with finite n. Modified forms for those methods were proposed to ensure the truncated processes were still zero-mean, unit-variance, and had a controllable scale of fluctuation; in particular, the modified form of Karhunen–Loève expansion was shown to be stationary in variance. As a result, the modified forms for those three methods are advantageous in simulating statistically homogenous material properties. The effectiveness of the modified forms was demonstrated by a numerical example.
       
  • A comparison of axial fatigue strength of coarse and ultrafine grain
           commercially pure titanium produced by ECAP
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): R. Naseri, H. Hiradfar, M. Shariati, M. Kadkhodayan Commercially pure titanium (CP-Ti) has been recently used as metallic biomaterials due to excellent biocompatibility and specific strength. CP-Ti has less static and dynamic strength as compared to other metallic biomaterials. Processing by the equal channel angular pressing (ECAP) as one of the most effective severe plastic deformation (SPD) method could lead to an increase in the mechanical strength of materials, significantly. In this study, Grade 2 CP-Ti billet is inserted into Al-7075 casing, and is then deformed by ECAP, with the channel angle of 135°, through 3 passes at route BC and room temperature. The purpose of using casing is to attain higher deformation homogeneity and more material ductility in the billet. The microstructural analysis shows that the coarse grain (CG) CP-Ti is developed to ultra-fine grain (UFG) structures after ECAP. In order to investigate the static and dynamic strength of CG and UFG CP-Ti, the tensile and axial fatigue tests are conducted. The results represent that UFG CP-Ti has much more tensile and fatigue strength than CG CP-Ti, and it could be utilized as biomaterials for production of implants. Surface features of fatigue fracture are also investigated. It should be noted that the investigation of fatigue strength of UFG CP-Ti produced by ECAP at RT utilizing casing, has not been conducted so far.
       
  • Study on mechanical acoustic emission sources in fresh concrete
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Evin Dildar Dzaye, Geert De Schutter, Dimitrios G. Aggelis Acoustic emission testing has proven very useful as a non-invasive monitoring method for several material processes. Recently several studies have emerged related to fresh concrete monitoring, as AE has the sensitivity to record waves from many different processes, even though no external load is applied to the specimens. Due to the complexity of the activity including among others formation of hydrates, settlement, water migration, early age cracking, the accumulated AE cannot be easily explained. In the present paper, two mechanisms of mechanical origin (aggregate and bubble movement through the paste) are isolated and the characteristics of their emissions are studied. Experimental results are complemented with numerical simulations to enhance the understanding due to the complexity of the wave propagation problem.
       
  • Effective compressive strengths of corner and exterior concrete columns
           intersected by slabs with different compressive strengths
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Seung-Ho Choi, Deuck Hang Lee, Jin-Ha Hwang, Jae-Yuel Oh, Kang Su Kim, Sang-Ho Kim In modern high-rise reinforced concrete buildings, high strength concrete (HSC) has been typically used for column members, while normal strength concrete (NSC) has been generally used for floor slabs. This study proposed a new analytic approach that can reasonably estimate the effective compressive strengths of corner and exterior column members intersected by lower strength concrete slabs. The proposed model was theoretically derived based on strain distributions and constraint conditions at an interface between column and slab members. In addition, the compressive strength test results of isolated, exterior, and corner columns intersected by lower strength concrete slabs reported in the existing literature were compared to the effective compressive strengths estimated by the proposed model. The proposed model provided good accuracy on the effective compressive strengths of the column members intersected by slabs cast with lower concrete compressive strengths. It was also shown that the proposed model successfully reflects the effects of the aspect ratio between the slab thickness and the column width on the effective compressive strengths of the test specimens and their failure modes that changed significantly according to the column–slab compressive strength ratio.
       
  • A study of interfacial heat transfer and its effect on quenching when hot
           stamping AA7075
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Wenchao Xiao, Baoyu Wang, Kailun Zheng, Jing Zhou, Jianguo Lin The aim of this research was to investigate the effects of contact pressure and lubrication on the interfacial heat transfer coefficient (IHTC) between AA7075 sheet and H13 tool steel and the in-die quenching performance in hot stamping. Firstly, a series of designed in-die quenching experiments were performed using different contact pressures, 0.05–30 MPa and lubrication conditions to determine the IHTC values using an efficient methodology. Secondly, temperature evolution of the tools and blank during the in-die quenching was investigated. Mechanical properties of material in-die quenched under different process conditions, were measured to determine their relation to quench conditions. The results have shown that IHTC values increased with increasing contact pressure and use of lubricant. A strength level of T6 condition could be obtained using a contact pressure greater than 5 MPa in the lubricated condition.
       
  • A brief study on δ-ferrite evolution in dissimilar P91 and P92 steel weld
           joint and their effect on mechanical properties
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Chandan Pandey, Manas Mohan Mahapatra, Pradeep Kumar, Nitin Saini, Jayant Gopal Thakre, R.S. Vidyarthy, H.K. Narang Ferritic/martensitic 9Cr-1Mo-V-Nb steel also designated as ASTM A335 used in construction of several components of power plants operating in temperature range of 600–650 °C. In present investigation, dissimilar weld joint of P91 and P92 steel were prepared using the autogenous tungsten inert gas (A-TIG) welding and multi-pass gas tungsten arc welding (GTAW) process. A comparative study was performed on evolution of δ-ferrite patches in weld fusion zone and heat affected zones (HAZs) of welded joints. The evolution of δ-ferrite patches was studied in as-welded and post-weld heat treatment (PWHT) condition. PWHT was carried out at 760 °C for tempering time of 2 h and 6 h, for both A-TIG and GTA weld joints. It was observed that presence of higher content of ferrite stabilizer in P92 steel promote the formation of δ-ferrite patches in weld fusion zone as well as HAZs. To study the effect of welding process and PWHT, Charpy V impact energy and microhardness tests were performed. For microstructure characterization, field-emission scanning electron microscope (FESEM) and optical microscope were utilized.
       
  • Damage characterization of aluminum 2024 thin sheet for different stress
           triaxialities
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): G.H. Majzoobi, M. Kashfi, N. Bonora, G. Iannitti, A. Ruggiero, E. Khademi Due to its attractive mechanical properties, aluminum 2024 is widely used in aircraft manufacturing industries, especially as fiber metal laminates, such as GLARE. In the present work, a series of experiments for different stress triaxialities are used to study the ductile damage of Al 2024 considering continuum damage mechanics (CDM). Stress triaxiality is produced using notched specimens. The main objective of the present study is to predict the local equivalent plastic strain to fracture and introducing a relation which describes the effect of stress triaxiality factor (TF) on it in the medium range of stress triaxiality. Hence, a nonlinear damage model is utilized for Al 2024 and its parameters are determined by an experimental/numerical/optimization procedure using tensile test on plain specimens. The experiments showed that for large notch specimens (Al-NL) and medium notch samples (Al-NM) fracture started from the center of the notch root of the specimens, whereas for small notched specimens (Al-NS) the failure initiated from the notch root surface. Finite element simulations are performed using the presented nonlinear damage model and are compared with the experimental data. Results show that the proposed damage model can predict the damage evolution for different stress triaxialities.
       
  • Numerical modelling of innovative DST steel joint under cyclic loading
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Angela Lemos, Luis Simões da Silva, Massimo Latour, Gianvittorio Rizzano This paper addresses the numerical simulation of an innovative double split Tee beam-to-column joint fitted with a dissipative friction damper, recently proposed at the University of Salerno. The innovative connection prevents damage to all other structural components with the exception of one component of the connection that is specially designed to dissipate the input energy of a seismic hazard by means of the slippage of a friction material. The main topics herein presented are the development of a strategy for the numerical modelling of complex friction problems and a detailed numerical model of the overall beam-to-column joint equipped with the friction device. The joint is subjected to both monotonic and cyclic loading conditions. The numerical modelling was developed using the Finite Elements Method (FEM) with Abaqus Software. Sliding force–displacement curves are obtained for two damper materials and an estimation of their wearing is presented. To evaluate the accuracy of the numerical model, moment–rotation curves of the joint are compared with the experimental curves. The FE results show good correlations and confirm the potential interest of this novel joint typology to achieve easily replaceable details in case of a seismic event.
       
  • Plastic flow of metals under cyclic change of deformation path conditions
    • Abstract: Publication date: July 2018Source: Archives of Civil and Mechanical Engineering, Volume 18, Issue 3Author(s): Włodzimierz Bochniak, Andrzej Korbel, Paweł Ostachowski, Marek Łagoda Reverse dislocation slip in metal, forced by cyclic change of deformation path (loading scheme), causes localized plastic flow with formation of dislocation dipoles which subsequently collapse leading to high concentration of point defects. Very low migration energy of point defects, especially self-interstitial atoms, indicating low bonding in a crystal lattice, favors low plastic flow viscosity which in turn leads to low flow stress and high plasticity (superplasticity) of metal. This paper presents the experimental results of KOBO extrusion and KOBO complex rolling, at low (room) temperature. The first method was used to produce thin wires made of MgLi4 magnesium alloy (extrusion ratio λ ∼ 10 000), and fully compacted wires made of AZ91 magnesium alloy in the form of machining chips. Basing on the second method, it has been proved possible to change the mechanical properties of strips made of 7075 aluminum alloy without any reduction in their thickness.
       
 
 
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