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  Subjects -> ENGINEERING (Total: 2298 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (192 journals)
    - ELECTRICAL ENGINEERING (104 journals)
    - ENGINEERING (1209 journals)
    - ENGINEERING MECHANICS AND MATERIALS (385 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (69 journals)
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CIVIL ENGINEERING (192 journals)                     

Showing 1 - 192 of 192 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: 36)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 28)
Agregat     Open Access  
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 31)
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: 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     Full-text available via subscription   (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: 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)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 16)
Building & Management     Open Access  
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: 12)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
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: 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: 6)
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: 18)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 10)
Civil Engineering Dimension     Open Access   (Followers: 8)
Civil Engineering Infrastructures Journal     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 268)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 11)
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: 9)
Construction Management and Economics     Hybrid Journal   (Followers: 22)
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: 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     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: 9)
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: 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: 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: 14)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 9)
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: 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: 7)
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: 12)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 8)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Engineering, Science and Technology     Open Access  
Journal of Civil Society     Hybrid Journal   (Followers: 4)
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 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: 14)
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: 5)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 10)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
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: 40)
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 Civil Engineering Forum     Open Access  
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 4)
Journal of Water and Environmental Nanotechnology     Open Access  
Jurnal Spektran     Open Access   (Followers: 1)
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  
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 17)
npj Materials Degradation     Open Access  
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 7)
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: 8)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 12)
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)
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: 11)
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: 5)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 10)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 12)
Structural Mechanics of Engineering Constructions and Buildings     Open Access  
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: 13)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 9)
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  [3118 journals]
  • Plastic flow of metals under cyclic change of deformation path conditions
    • Authors: Włodzimierz Bochniak; Andrzej Korbel; Paweł Ostachowski; Marek Łagoda
      Pages: 679 - 686
      Abstract: Publication date: July 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 3
      Author(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 ∼10000), 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.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.11.004
       
  • Numerical modelling of innovative DST steel joint under cyclic loading
    • Authors: Angela Lemos; Luis Simões da Silva; Massimo Latour; Gianvittorio Rizzano
      Pages: 687 - 701
      Abstract: Publication date: July 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 3
      Author(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.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.10.008
       
  • Damage characterization of aluminum 2024 thin sheet for different stress
           triaxialities
    • Authors: G.H. Majzoobi; M. Kashfi; N. Bonora; G. Iannitti; A. Ruggiero; E. Khademi
      Pages: 702 - 712
      Abstract: Publication date: July 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 3
      Author(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.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.11.003
       
  • A brief study on δ-ferrite evolution in dissimilar P91 and P92 steel weld
           joint and their effect on mechanical properties
    • Authors: Chandan Pandey; Manas Mohan Mahapatra; Pradeep Kumar; Nitin Saini; Jayant Gopal Thakre; R.S. Vidyarthy; H.K. Narang
      Pages: 713 - 722
      Abstract: Publication date: July 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 3
      Author(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 2h and 6h, 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.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.12.002
       
  • A study of interfacial heat transfer and its effect on quenching when hot
           stamping AA7075
    • Authors: Wenchao Xiao; Baoyu Wang; Kailun Zheng; Jing Zhou; Jianguo Lin
      Pages: 723 - 730
      Abstract: Publication date: July 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 3
      Author(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, 0.05–30MPa 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 5MPa in the lubricated condition.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.12.001
       
  • Effective compressive strengths of corner and exterior concrete columns
           intersected by slabs with different compressive strengths
    • Authors: Seung-Ho Choi; Deuck Hang Lee; Jin-Ha Hwang; Jae-Yuel Oh; Kang Su Kim; Sang-Ho Kim
      Pages: 731 - 741
      Abstract: Publication date: July 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 3
      Author(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.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.11.001
       
  • Mechanical performances of rock-like disc containing circular inclusion
           subjected to diametral compression
    • Authors: Xu Chang; Jing Tang; GuoZhu Wang; Chunan Tang
      Pages: 356 - 370
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Xu Chang, Jing Tang, GuoZhu Wang, Chunan Tang
      This paper presents a numerical investigation of cracking behaviour of rock-like disc containing one circular inclusion subjected to diametral compression, which is validated by physical tests in terms of the crack patterns and stress–strain responses. The numerical results indicate that if the inclusion strength is higher or close to the matrix strength, one dominated crack can form to split the disc into two parts. Otherwise, the crack branches can be observed besides the dominated crack. The inclusion eccentricity has important influences on the crack pattern of the rock disc. If the inclusion strength is lower than the matrix strength, the horizontal eccentricity can induce to a horizontal crack. The length of the horizontal crack is close related to the eccentricity that a higher eccentricity can lead to a longer horizontal crack. The vertical eccentricity can result in crack branch, which becomes shorter as the eccentricity increases. If the inclusion strength is higher than the matrix, the horizontal and vertical eccentricity cannot lead to crack branches and only one dominated crack can be observed. The disc nominal strength increases by increasing the horizontal or vertical eccentricity both for cases of the inclusion strength lower and greater than the matrix.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.07.008
       
  • Electrical and piezoresistive sensing capacities of cement paste with
           multi-walled carbon nanotubes
    • Authors: Doo-Yeol Yoo; Ilhwan You; Seung-Jung Lee
      Pages: 371 - 384
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Doo-Yeol Yoo, Ilhwan You, Seung-Jung Lee
      This study examined the feasibility of using multi-walled carbon nanotubes (MWCNTs) in cement paste for piezoresistive sensors. Two types of MWCNTs with different carbon content (>90% and >99%) were incorporated into cement paste at 1% by weight of binder (1wt%). Plain cement paste and cement composites including 1wt% graphite nanofiber (GNF) and graphene (G) were also considered for comparisons of the electrical conductivity. The test results indicate that the MWCNTs more effectively improved the conductivity of the cement paste than GNF and G. In addition, composites with MWCNTs with lower flowability had less resistivity than those with higher flowability. The size effect in electrical resistivity was observed in the cement pastes with and without the carbon-based nanomaterials, but it was mitigated by incorporating MWCNTs in the cement paste. The stresses and strains under cyclic compression and monotonic tension were well simulated by the measured fraction change in the resistivity of the composites with 1wt% MWCNTs. The gauge factor (GF) for the composites with 1wt% MWCNTs was higher than that of commercially available strain gauges, and it was affected by the loading condition: a higher GF obtained under compression than under tension.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.09.007
       
  • Experimental investigation on effects of machining parameters on the
           performance of Ti-6Al-4V micro rotary parts fabricated by LS-WEDT
    • Authors: Yao Sun; Yadong Gong; Yin Liu; Ming Cai; Xiaoteng Ma; Pengfei Li
      Pages: 385 - 400
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Yao Sun, Yadong Gong, Yin Liu, Ming Cai, Xiaoteng Ma, Pengfei Li
      The low speed wire electrical discharge turning (LS-WEDT) is firstly proposed to fabricate the Ti-6Al-4V micro rotary workpiece in this study. The surface quality, sub-surface damages and machining efficiency of LS-WEDT process are discussed. The single factor experiments and orthogonal experiments are respectively conducted to analyze effects of speed parameters and peak current on surface roughness (Ra), material removal rate (MRR), surface morphology and the white layer of the TC4 micro rotary workpiece machined by LS-WEDT. Experimental results indicated that the most important factors affecting the Ra and MRR in LS-WEDT respectively are the peak current and feeding speed, and the rotating speed and feeding speed have significant interactive effect on Ra and MRR. Besides, the low feeding speed can cause surface burning and the high rotating speed will elongate craters. Furthermore, the surface oxidation of TC4 workpiece machined by LS-WEDT is far more serious than the surface alloying and Ti3O and Ti6O can be detected on the machined surface. Moreover, the serrated white layer can be observed and gradually becomes continuous and thin with the decrease of peak current. Finally, large amounts of oxygen and less copper elements can be detected on the top of the white layer and longitudinal cracks.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.09.006
       
  • Forging of Mg/Al bimetallic handle using explosive welded feedstock
    • Authors: Sebastian Mróz; Andrzej Gontarz; Krzysztof Drozdowski; Henryk Bala; Piotr Szota
      Pages: 401 - 412
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Sebastian Mróz, Andrzej Gontarz, Krzysztof Drozdowski, Henryk Bala, Piotr Szota
      The paper presents the results of investigation into the possibility of employing the forging process to produce aluminium-clad magnesium products. The purpose of the investigation was to develop and implement the technology of Mg/Al bimetal feedstock screw press forging and to compare the corrosion resistance of the product with that of an identical product made of a magnesium alloy. The feedstock was round 22.5mm-diameter and 160mm-length Mg/Al bars that had been produced using the explosive welding method. As an example product, a door handle used in helicopter production was selected. For comparison purposes, the door handle was also forged of magnesium alloy AZ31. After the forging process, the both products were subjected to corrosion resistance testing. From the obtained results it was found that the forging of the assumed quality could be made in the process of forging on the screw press, and that the use of the aluminium cladding layer only slightly increased the mass of the finished products, while substantially improving its corrosion resistance.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.09.005
       
  • The influence of austenitization temperature on phase transformations of
           supercooled austenite in low-alloy steels with high resistance to abrasion
           wear
    • Authors: Beata Białobrzeska; Rafał Dziurka; Andrzej Żak; Piotr Bała
      Pages: 413 - 429
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Beata Białobrzeska, Rafał Dziurka, Andrzej Żak, Piotr Bała
      The paper presents continuous cooling transformation (CCT) diagram of selected low-alloy steel with high resistance to abrasion. Samples were prepared from examined material in as delivered conditions, then were austenitized at 900, 1000, 1100 and 1200°C for 20min, and then cooled with the rates of V 800–500 =50, 10, 5, 1, 0.5, 0.1°C/s. During the dilatometric research, the critical temperatures were defined as well as the critical points specified for different cooling rates were designated. In addition, metallographic documentation of received microstructures after dilatometric investigations was prepared and hardness measurement was performed. The increase in the austenitizing temperature caused changes in the temperature of M S and in the size of the martensite laths. What is more, the increase in the austenitizing temperature in the case of the analyzed steel caused a displacement of the bainitic and diffusion transformations to longer times. During the analysis using the TEM and SEM it was found that the size of the austenite grains is largely controlled by precipitates of the nitrides of AlN, TiN and carbides, mainly Cr7C3 and M23C6.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.09.004
       
  • Shear performance of embedded anchor plates in reinforced concrete tilt-up
           panels under monotonic and cyclic loadings
    • Authors: Won-Chang Choi; Seok-Joon Jang; Sun-Hee Kim; Hyun-Do Yun
      Pages: 430 - 441
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Won-Chang Choi, Seok-Joon Jang, Sun-Hee Kim, Hyun-Do Yun
      Cast-in-place steel plates with headed steel studs constitute a common type of connection system in tilt-up members. These connection systems used in composite construction play an important role in vertical and lateral load transfer mechanisms and in the energy dissipation of seismic responses by allowing sufficient ductility and controlling cracks in the concrete elements. Due to the relatively thin concrete panel thickness, it is difficult to attain adequate ductility in connection system. This study examined design parameters, including the embedment depth-to-stud diameter ratio (h ef /d), panel thickness, and supplementary reinforcement, in order to propose effective reinforcing methods to prevent premature failure such as pry-out failure. In addition, this study investigated the feasibility of current existing formulas, including those found in the American Concrete Institute 318M-14 provisions and in the Precast/Prestressed Concrete Institute Handbook with respect to the design variables. This study also investigated the difference between monotonic and cyclic test results and compared the results obtained from the literature.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.09.002
       
  • Thermoplastic fibre metal laminates: Stiffness properties and forming
           behaviour by means of deep drawing
    • Authors: Tino Wollmann; Marlon Hahn; Sebastian Wiedemann; Andreas Zeiser; Jörn Jaschinski; Niels Modler; Nooman Ben Khalifa; Frank Meißen; Christian Paul
      Pages: 442 - 450
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Tino Wollmann, Marlon Hahn, Sebastian Wiedemann, Andreas Zeiser, Jörn Jaschinski, Niels Modler, Nooman Ben Khalifa, Frank Meißen, Christian Paul
      Hybrid materials provide a high potential for lighter structures and an improved crash performance. The investigated hybrid sandwich laminate consists of steel cover sheets and a carbon fibre-reinforced thermoplastic core. The first part of this investigation is focusing on an analytical prediction as well as on a comparison of numerical and experimental results for the evaluation of the laminate properties to get a general understanding for the material. Within the second part the forming behaviour of this material is investigated experimentally, analytically and numerically by means of cup deep drawing. These results indicate that cup deep drawing of thermoplastic fibre metal laminates is possible but limited. The limits in terms of achievable drawing depths are found to be defined by cracking and wrinkling of the cover sheets as well as fibre failure in the composite material.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.09.001
       
  • Experimental study on bridge–track system temperature actions for
           Chinese high-speed railway
    • Authors: Ping Lou; Junpu Zhu; Gonglian Dai; Bin Yan
      Pages: 451 - 464
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Ping Lou, Junpu Zhu, Gonglian Dai, Bin Yan
      Atmospheric temperature and directed solar radiation have a significant effect on the temperature field of high-speed railway (HSR) concrete bridge and ballastless track structure. However, temperature actions are random process of which distribution laws are difficult to explore, and existing statistical methods for structure temperature analysis are still not precise. So far, there are few researches for annual temperature spectra and design codes for bridge–track system. Based on the one-year observation data, this paper investigated the temperature actions for Chinese HSR bridge–track structure. By utilizing reliability high moment theory, a statistical method which could built virtual distribution was put forward. Based on the renewed study, the effects of waterproof for deck were taken into consideration, a temperature action model was proposed which is suitable for both bridge and track structure. In addition, for track structure, the previous temperature load models were modified. Apart from that, by proposing the concepts of temperature uniform and fluctuant spectra, the research evaluated service performance of structure. Finally, the distribution regularities of uniform temperature spectra were fitted by Fourier series, and the relationship between structural and atmospheric uniform temperature was established (formula (25)). As a result, according to 50 years recorded atmospheric temperature data, the prediction model of the structure extreme temperature was suggested, and by taking the recurrence interval of 100, 150 and 300 years, the extreme temperatures of the system are 52.23, 54.34 and 57.77°C.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.08.006
       
  • Low cycle fatigue studies of WCLV steel (1.2344) used for forging tools to
           work at higher temperatures
    • Authors: Marek Hawryluk; Andrzej Dolny; Stanisław Mroziński
      Pages: 465 - 478
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Marek Hawryluk, Andrzej Dolny, Stanisław Mroziński
      The paper presents the results of low cycle fatigue studies of WCLV tool steel aimed at determining the diagrams of low cycle fatigue and verifying them based on the analysis of durability of the selected forging tool. Based on the macro- and microstructural tests as well as numerical modelling of industrial forging processes, the conditions for the implementation of laboratory fatigue tests were determined. The samples underwent periodical uniaxial loading (tension–compression conditions) at four levels of amplitude of total strain (0.5; 0.8; 1.0; 2.0%), at three temperatures (20, 300 and 600°C), based on the macro- and microstructural tests as well as numerical modelling of industrial forging processes. For the determination of the hysteresis loop based on the obtained fatigue results, the Ramberg–Osgood equation was applied. The fatigue diagrams in the bilogarithmic system were approximated by the Manson–Coffin–Basquin equation, and the diagrams of low cycle fatigue in the ɛ a–N f and σ a–N f system were obtained. The results of the laboratory tests concerning the fatigue strength of WCLV tool steel were preliminarily verified based on the analysis of the punch used to forge a lid forging, exhibiting a good agreement. The performed comparative analysis of the results of the fatigue tests and the numerical analysis combined with the studies of the microstructure revealed the possibility of their application in the aspect of forging tools’ durability as well thermo-mechanical fatigue strength.

      PubDate: 2017-11-03T09:23:31Z
      DOI: 10.1016/j.acme.2017.08.002
       
  • Novel non-invasive seismic upgradation strategies for gravity load
           designed exterior beam-column joints
    • Authors: Ashok Kumar Kanchana Devi; Ramajaneyulu Karusala; Mayank Tripathi; Saptarshi Sasmal
      Pages: 479 - 489
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Ashok Kumar Kanchana Devi, Ramajaneyulu Karusala, Mayank Tripathi, Saptarshi Sasmal
      Existing gravity load designed (GLD) structures are vulnerable to seismic event due to their inherent weaknesses. The present study, focuses on the development of non-invasive and feasible strategies for seismic upgradation of these non-seismically designed structures. Three novel schemes, namely (i) single haunch upgradation scheme (U1), (ii) straight bar upgradation scheme (U2) and (iii) simple angle upgradation scheme (U3) are proposed for seismic upgradation of GLD specimens. The efficacy and effectiveness of these upgradation schemes are evaluated by conducting the reverse cyclic load tests on control and upgraded GLD exterior beam-column sub-assemblages. The performance of the upgraded specimens is compared with that of the control GLD beam-column sub-assemblage, in terms of load–displacement hystereses, energy dissipation capacities and global strength degradation behaviour. Tremendous improvement in the energy dissipation capacity to the tune of 2.63, 2.83 and 1.54 times the energy dissipated by the control GLD specimen is observed in single haunch upgraded specimens, straight bar upgraded specimen and simple angle upgraded specimen respectively. The specimen with single haunch upgradation performed much better compared to the GLD specimens upgraded with the other two schemes, by preventing the brittle anchorage failure, delaying the joint shear damage and redirecting the damage partially towards the beam.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.08.005
       
  • Detection of strain localization in numerical simulation of sheet metal
           forming
    • Authors: Dmytro Lumelskyj; Jerzy Rojek; Marek Tkocz
      Pages: 490 - 499
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Dmytro Lumelskyj, Jerzy Rojek, Marek Tkocz
      This paper presents an investigation on the detection of strain localization in numerical simulation of sheet metal forming. Two methods to determine the onset of localized necking have been compared. The first criterion, newly implemented in this work, is based on the analysis of the through-thickness thinning (through-thickness strain) and its first time derivative in the most strained zone. The limit strain in the second method, studied in the authors’ earlier works, is determined by the maximum of the strain acceleration. The limit strains have been determined for different specimens undergoing deformation at different strain paths covering the whole range of the strain paths typical for sheet forming processes. This has allowed to construct numerical forming limit curves (FLCs). The numerical FLCs have been compared with the experimental one. Mesh sensitivity analysis for these criteria has been performed for the selected specimens. It has been shown that the numerical FLC obtained with the new criterion predicts formability limits close to the experimental results so this method can be used as a potential alternative tool to determine formability in standard finite element simulations of sheet forming processes.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.08.004
       
  • Microstructure and properties of CuCr0.6 and CuFe2 alloys after rolling
           with the cyclic movement of rolls
    • Authors: Kinga Rodak; Anna Urbańczyk-Gucwa; Magdalena Barbara Jabłońska
      Pages: 500 - 507
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Kinga Rodak, Anna Urbańczyk-Gucwa, Magdalena Barbara Jabłońska
      This work is focused on the effect of rolling with cyclic movement of rolls (RCMR) on microstructure, mechanical properties and electrical conductivity of CuCr0.6 and CuFe2 alloys in states after applying different heat treatments. The mechanical properties were determined by using MST QTest/10 machine equipped with digital image correlation (DIC). Scanning transmission electron microscopy (STEM) was used for microstructural characterization. The RCMR processed alloys shows high mechanical strength (UTS:539MPa for CuCr0.6 alloy and UTS:393MPa for CuFe2 alloy) attributed to the high density of coherent precipitates (after aging at 500°C/2h) and ultrafine grained structure. Plastically properties as uniform elongation (A gt) was about (∼1%) for both alloys after RCMR deformation. The RCMR processing induces a significant reduction of the electrical conductivity for samples, which were quenched before deformation, but for samples which were subjected to aging before deformation, the electrical conductivity was restored thanks to precipitation process.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.07.001
       
  • An input–output damage detection method using static equivalent
           formulation of dynamic vibration
    • Authors: Mohsen Mousavi; Amir H. Gandomi
      Pages: 508 - 514
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Mohsen Mousavi, Amir H. Gandomi
      In this study, a new damage detection method is developed which directly uses input–output data of a forced vibration of a structure. For this, the dynamic vibration formulation of an FE model has been integrated within the time domain of the vibration of the structure. Also, the static condensation scheme is used to reduce required measured degrees of freedom (DOF's). Hence, the main characteristic of the proposed method is that it just uses translational time history response of a structure at specified nodes corresponding to the finite element model of that structure. Also, the only required data from the original FE model of the structure is its stiffness matrix. To assess the capability of the proposed method in damage detection in beam type structures a cantilever beam is studied. Not only can the method locate damaged elements, but also the quantity of damage in every damaged element is computed successfully. Also, it has been shown that as the frequency of the applied load in simulated experiment approaches to the first natural frequency of the beam, the accuracy dwindles significantly. Hence, for obtaining more reliable results, the frequency of the applied load shall be far enough from the first natural frequency of the free vibration of the beam. The results demonstrate that the integrated displacements in specified nodes through the time of vibration carry enough information about damages in elements and the proposed method can be successfully used for damage detection in beam type structures.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.01.007
       
  • Effect of heat treatment parameters on abrasive wear and corrosion
           resistance of austenitic nodular cast iron Ni–Mn–Cu
    • Authors: Daniel Medyński; Andrzej Janus
      Pages: 515 - 521
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Daniel Medyński, Andrzej Janus
      Influence of heat treatment parameters on abrasive wear and corrosion resistance of nodular cast iron Ni–Mn–Cu was examined. Chemical composition was selected in such a way, that austenitic matrix was obtained in raw castings (relatively good machinability). Heat treatment, consisting of soaking (450, 550, 650°C for 4, 8, 12h) and air cooling, led to partial transformation of austenite. At the lowest temperature, martensite was formed. Raising the temperature and prolonging the soaking time caused increase of austenite transformation degree. At the same time, a gradual change in morphology of the coniferous phase was observed in the direction of fine-acicular ferrite found in bainite or ausferrite. As a result, significant increase in hardness and wear resistance of castings was observed. The heat treatment caused slight changes in gravimetric corrosion rate. However, potentiodynamic studies indicate, that the nature of corrosion from local to uniform was changed. From the point of view of corrosion resistance, this is a very beneficial phenomenon.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.08.001
       
  • Analysis of resistance welding processes and expulsion of liquid metal
           from the weld nugget
    • Authors: Zygmunt Mikno; Adam Pilarczyk; Marcin Korzeniowski; Paweł Kustroń; Andrzej Ambroziak
      Pages: 522 - 531
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Zygmunt Mikno, Adam Pilarczyk, Marcin Korzeniowski, Paweł Kustroń, Andrzej Ambroziak
      The article presents the process of resistance welding in relation to the expulsion of liquid metal from the weld nugget. The research-related tests involved the synchronic recording of welding process parameters such as welding current and voltage as well as electrode force and travel. The phenomenon of expulsion was filmed using a high speed camera. The tests aimed to determine the most effective parameter as regards the detection of expulsion as well as the accurate determination of the moment of expulsion in relation to the above-named parameter. During the tests it appeared that the most favourable parameter was the force of electrodes. The tests required the precise synchronisation of the recording of process parameters with the recording of images (using the camera). The uncertainty of expulsion time determination was estimated at 0.1ms. The research-related experimental tests were focused on the possibility of eliminating expulsion by stopping (blocking) the flow of welding current. In the case of expulsion, the process of welding was continued with a delayed second current pulse. The force signal, on the basis of which the expulsion detection was performed, was analysed using a dedicated controller which implementing the algorithm of discreet differentiation. The tests were performed using an inverter welding machine having an internal transformation frequency of 10kHz. In this study, SORPAS software-aided FEM analysis was performed to analyse the possibility of the effective reduction of the expulsion phenomenon.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.08.003
       
  • Probabilistic mechanical properties and reliability of carbon nanotubes
    • Authors: Amir Hossein Esbati; Saied Irani
      Pages: 532 - 545
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Amir Hossein Esbati, Saied Irani
      Carbon nanotubes (CNTs) and their products such as polymer nanocomposite (PNC) are an undeniable part of future materials. To use such future materials, it is necessary to have an accurate evaluation of their properties. Several uncertainties such as structural defects and their distributions cause change in the properties of CNTs that could be considered probabilistic variables. A novel procedure is presented for evaluating CNTs’ probabilistic fracture properties and structural reliability using stochastic finite element methods. By employing two dimensionless parameters, both types of Stone–Wales 5-7-7-5 defects are randomly applied to CNTs. Section defect density and critical section defect density are defined and used to manage the distribution and geometrical configuration of CNTs’ structural defects. A probabilistic method is used to evaluate the effect of defects’ distribution on Young's modulus, ultimate strain, and ultimate stress. It has been observed that normal and Weibull distribution functions are suitable for describing Young's modulus distribution and ultimate stress distribution, respectively. Defect density ratio is defined and, using this parameter, the effect of aggregated defects on mechanical properties is evaluated. It is demonstrated that the defects out of critical section have an unavoidable effect on Young's modulus and ultimate strain; but they have an insignificant effect on ultimate stress. A reliability analysis is performed on armchair (15,15) CNTs and it is investigated that the reliability of CNTs depends on critical defect density significantly. In addition, the reliability is equal to one for the stress of less than 50GPa and this value is equal to zero for the stress of higher than 100GPa, independent from the changes of critical defect density. Eventually, a procedure is described to estimate the reliability of armchair CNTs using critical defect density and the results’ accuracy is discussed and evaluated.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.05.001
       
  • Vacuum brazing of Ti2AlNb and TC4 alloys using Ti–Zr–Cu–Ni and
           Ti–Zr–Cu–Ni+Mo filler metals: Microstructural evolution and
           mechanical properties
    • Authors: Ying Wang; Man Jiao; Zhenwen Yang; Dongpo Wang; Yongchang Liu
      Pages: 546 - 556
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Ying Wang, Man Jiao, Zhenwen Yang, Dongpo Wang, Yongchang Liu
      Two kinds of filler metal, Ti–Zr–Cu–Ni and Ti–Zr–Cu–Ni+Mo, were used to vacuum braze Ti2AlNb and TC4 alloys. The interfacial microstructures and the room temperature (RT) and elevated temperature shear strengths of the brazed joints were analysed. Moreover, the effects of the brazing parameters and filler metal Mo content on the microstructure and corresponding mechanical properties of the brazed joints were investigated. The results showed that the typical brazed joint mainly contained α-Ti, (Ti,Zr)2(Cu,Ni), β-Ti, and Ti-rich phases. The addition of the Mo particles was beneficial to inhibit the eutectoid transformation of β-Ti during cooling, resulting in the formation of residual β-Ti instead of α-Ti. In addition, Mo particles can also make the microstructure more homogeneous. The highest RT shear strength of the joints brazed with the Ti–Zr–Cu–Ni filler metal was 351MPa when the joint was brazed at 980°C for 10min. Under the same brazing parameters, the RT shear strength reached 437MPa with the addition of 8wt.% Mo particles to the filler metal. Moreover, the shear strengths of the joints brazed with the Mo-free and 8wt.% Mo filler metals tested at 600°C were 272MPa and 393MPa, respectively.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.10.006
       
  • Cyclic testing of steel frames infilled with concrete sandwich panels
    • Authors: Seyed Jafar Hashemi; Javad Razzaghi; Abdolreza S. Moghadam; Paulo B. Lourenço
      Pages: 557 - 572
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Seyed Jafar Hashemi, Javad Razzaghi, Abdolreza S. Moghadam, Paulo B. Lourenço
      In-plane seismic behaviour of concrete sandwich panel-infilled steel frame (CSP-ISF) was experimentally and numerically investigated. Four large-scale, single bay and single story steel frame specimens were tested under reversed cyclic lateral loading. Three infilled frames with different aspect ratios along with one bare frame were considered. It was found that addition of sandwich panels leads to considerable increase in the lateral stiffness and strength, ductility, energy dissipation capacity as well as equivalent viscous damping ratio of the steel frames. Furthermore, the maximum shear capacity of CSP-ISF specimens was validated by analytical approaches which showed good agreement with experimental results. Based on the present experiments, structural performance levels required for Performance-based Analysis are also proposed for concrete sandwich panel used as infill walls. Finally, a numerical model is presented to analyze the nonlinear behaviour of CSP-ISFs.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.10.007
       
  • Multi-sensor evaluation of the concrete within the interlayer bond with
           regard to pull-off adhesion
    • Authors: Łukasz Sadowski; Andrzej Żak; Jerzy Hoła
      Pages: 573 - 582
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Łukasz Sadowski, Andrzej Żak, Jerzy Hoła
      The article presents the results of multi-sensor evaluation of the concrete within the interphase between overlay and existing substrate with regard to pull-off adhesion. It has been shown that both the effective surface area of the existing concrete substrate and the contribution of the exposed aggregate on this substrate, as a result of concrete substrate surface treatment, have a significant impact on pull-off adhesion. The highest adhesion was obtained when the surface of the existing concrete substrate was shot-blasted. This method of surface treatment provides both a high coarseness of the surface of the existing concrete substrate and considerable exposure of the aggregate on this surface. In order to clarify why this method of surface treatment of existing concrete substrate is advantageous with regard to the possibility of obtaining high adhesion, scanning electron microscopy (SEM) was used. SEM microstructural analysis was performed on concrete cubic specimens taken from the interphase zone between the overlay and existing concrete substrate. The results of these studies, including the contact type between the overlay made of cement mortar and the existing concrete substrate, are presented in the study.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.09.008
       
  • Comparative evaluation of various experimental and numerical simulation
           
    • Authors: Adam Sajek; Jerzy Nowacki
      Pages: 583 - 591
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Adam Sajek, Jerzy Nowacki
      The aim of this article is to provide a quantitative comparison and efficiency verification of the methods of estimating t 8/5 cooling time in the process of HPAW of S960QL steel. The measurements of t 8/5 welding time were conducted at the face of weld with the use of thermoelectric, pyrometric and thermovision methods. A FEM model of the joint was made, and welding simulation was done. The results of the calculations were then confronted with experimental data, and measuring methods were evaluated. Differences in the results of t 8/5 time measurements were determined for the analysed methods and arranged according to the precision of results presented; the applicability of FEM for predicting the value of t 8/5 time was investigated. The usability of temperature measuring methods for determining cooling time was determined, the weaknesses of non-contact measurement in terms of diversification of cooling time in a section of a welded joint were shown, and the advantages of numerical method were demonstrated. It was established that joining experimental methods for measuring cooling time of a joint with FEM analysis allows to obtain a desired resolution of prediction. In this way, the technology for hybrid welding of advanced high-strength steels can be designed more efficiently.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.10.001
       
  • Simplified reliability analysis of multi hazard risk in gravity dams via
           machine learning techniques
    • Authors: Mohammad Amin Hariri-Ardebili; Farhad Pourkamali-Anaraki
      Pages: 592 - 610
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Mohammad Amin Hariri-Ardebili, Farhad Pourkamali-Anaraki
      Deterministic analysis does not provide a comprehensive model for concrete dam response under multi-hazard risk. Thus, the use of probabilistic approach is usually recommended which is problematic due to high computational demand. This paper presents a simplified reliability analysis framework for gravity dams subjected to flooding, earthquakes, and aging. A group of time-variant degradation models are proposed for different random variables. Response of the dam is presented by explicit limit state functions. The probability of failure is directly computed by either classical Monte Carlo simulation or the refined importance sampling technique. Next, three machine learning techniques (i.e., K-nearest neighbor, support vector machine, and naive Bayes classifier) are adopted for binary classification of the structural results. These methods are then demonstrated in terms of accuracy, applicability and computational time for prediction of the failure probability. Results are then generalized for different dam classes (based on the height-to-width ratio), various water levels, earthquake intensity, degradation rate, and cross-correlation between the random variables. Finally, a sigmoid-type function is proposed for analytical calculation of the failure probability for different classes of gravity dams. This function is then specialized for the hydrological hazard and the failure surface is presented as a direct function of the dam's height and width.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.09.003
       
  • Vibrational analysis of armchair phosphorene nanotubes by a DFT-based
           finite element model
    • Authors: Saeed Rouhi; Ayoub Shahnazari; Reza Ansari
      Pages: 611 - 621
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Saeed Rouhi, Ayoub Shahnazari, Reza Ansari
      A finite element model based upon the density functional theory is developed to investigate the vibrational characteristics of armchair phosphorene nanotubes. To this end, the PP bonds are simulated by beam elements whose elastic properties are obtained from the analogy of molecular and structural mechanics. The effects of nanotube length, diameter and boundary conditions on the frequencies of armchair phosphorene nanotubes are evaluated. It is shown that the effect of nanotube radius on its natural frequency is weakened by increasing the nanotube aspect ratio. Comparing the first ten frequencies of armchair phosphorene nanotubes with different diameters, it is observed that the effect of diameter on the vibrational behavior of phosphorene nanotubes is more pronounced at higher modes.

      PubDate: 2017-11-10T10:21:02Z
      DOI: 10.1016/j.acme.2017.10.004
       
  • Parametric study on cement treated aggregate panel under impact load
    • Authors: Saima Ali; Xuemei Liu; David Thambiratnam; Sabrina Fawzia; Yuantong Gu; Jun Wu; Alex Remennikov
      Pages: 622 - 629
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Saima Ali, Xuemei Liu, David Thambiratnam, Sabrina Fawzia, Yuantong Gu, Jun Wu, Alex Remennikov
      The cement treated aggregate (CTA) is increasingly used as base or sub-base layer for pavement to withstand various traffic and dynamic loads. Under extreme events, the CTA layer of the pavement is expected to absorb significant amount of impact energies subjected to different loading conditions including accidents, mobile vehicles, heavy aircrafts, machinery, or even terrorist attack. However, no research has been found on the resistance of CTA under drop weight impact load. To fill up this gap, a detailed study was carried out to investigate the impact resistance of CTA under impact loading through both experimental and finite element analysis (FEA). Moreover, detailed parametric studies were carried out based on the validated model to determine the significance of selected key parameters on the impact resistance of CTA.

      PubDate: 2017-11-23T08:24:01Z
      DOI: 10.1016/j.acme.2017.10.002
       
  • Determination of coupled mechanical and thermal fields using 2D digital
           image correlation and infrared thermography: Numerical procedures and
           results
    • Authors: Marcin Nowak; Michał Maj
      Pages: 630 - 644
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Marcin Nowak, Michał Maj
      The objective of the work is to develop numerical method for determining coupled thermo-mechanical fields based on experimental data obtained from two cameras working in the visible and infrared mode. The sequence of images recorded by the first camera is used to determine the displacement field on the sample surface using the 2D digital image correlation (DIC) method. The resulting field from DIC analysis in a form of a set of discrete points with the corresponding in-plane displacement vector is used as the input for the next step of analysis, where the coupled temperature field is computed. This paper provides a detailed description of the numerical procedures, that allow, to obtain coupled thermal and mechanical fields together with the specification of experimental data needed for calculations. The presented approach was tested on an experimental data obtained during uniaxial tension of the multicrystalline aluminum. The developed numerical routine has been implemented in dedicated software, which can be used for the testing of materials on both a macro and micro scales.

      PubDate: 2017-11-23T08:24:01Z
      DOI: 10.1016/j.acme.2017.10.005
       
  • Numerical analysis of temperature and residual stresses in hot-rolled
           steel strip during cooling in coils
    • Authors: Szczepan Witek; Andrij Milenin
      Pages: 659 - 668
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Szczepan Witek, Andrij Milenin
      The main factors influencing on the level of residual stresses in hot rolled steel strips are related with uneven temperature and microstructure changes during cooling on the run-out table and in a coil. That is why in this work, development of coil cooling model with taking into account the influence of radial stresses on the effective thermal conductivity in the radial direction was performed. In order to assess the influence of the phase transformations in the coil on the level of residual stresses, the different laminar cooling strategies were applied. The results of numerical simulations obtained in this work were validated in industrial conditions. It is shown that the end of phase transformations in the strip coil has a significant influence on the level of residual stresses.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.11.002
       
  • Analytical modeling of grinding process in rail profile correction
           considering grinding pattern
    • Authors: Yue Ming Liu; Tian Yong Yang; Zhe He; Jian Yong Li
      Pages: 669 - 678
      Abstract: Publication date: February 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 2
      Author(s): Yue Ming Liu, Tian Yong Yang, Zhe He, Jian Yong Li
      An analytical introduction to rail grinding was presented in this paper where a newly-designed profile serves as the targeted ground profile to extend the rail's service life. A method for determining eliminated metal due to rail grinding is established as an initial consideration in the process of rail profile correction. The analytical model of material removal contains grinding wheel characteristics such as rotation speed, feeding speed, and applied pressure to the ground rail. The assumed coefficient in this model was fitted by a scratch test between a single abrasive grain and rail specimen. The sectional area s of removed metal can be used to estimate grinding capacity rather than the traditional grinding depth. An algorithm that generates personalized grinding patterns is proposed to arrange grinding wheel location and proper sequence. The whole procedure was indirectly validated in terms of grinding quality and rail profile error through rail grinding field data. A grinding pattern was generated by the proposed method that can effectively simulate the ground rail profile within a pre-determined tolerance. The area difference of predicted and target profiles was 13 mm2 (6.6%) and the experimental result was 12.2mm2 at rail cross-section.

      PubDate: 2017-12-26T19:33:57Z
      DOI: 10.1016/j.acme.2017.10.009
       
  • 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
       
  • 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
       
 
 
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