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  Subjects -> ENGINEERING (Total: 2268 journals)
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CIVIL ENGINEERING (183 journals)                     

Showing 1 - 183 of 183 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: 35)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 28)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 30)
Architectural Engineering     Open Access   (Followers: 4)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 1)
Archives of Civil Engineering     Open Access   (Followers: 10)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 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: 15)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 15)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 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: 5)
Civil and Environmental Research     Open Access   (Followers: 19)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 17)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 10)
Civil Engineering Dimension     Open Access   (Followers: 8)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 265)
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: 16)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 14)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 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: 6)
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 2)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 22)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 16)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 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: 5)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 2)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 10)
International Journal of Structural Integrity     Hybrid Journal   (Followers: 2)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Built Environment     Open Access   (Followers: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 6)
International Journal Sustainable Construction & Design     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 15)
Journal of Building Engineering     Hybrid Journal   (Followers: 1)
Journal of Building Materials and Structures     Open Access   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 6)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 12)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 7)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Society     Hybrid Journal   (Followers: 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: 13)
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)
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)
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: 7)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 11)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 4)
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
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: 10)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 6)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Selected Scientific Papers - Journal of Civil Engineering     Open Access   (Followers: 3)
Slovak Journal of Civil Engineering     Open Access   (Followers: 2)
Soils and foundations     Full-text available via subscription   (Followers: 4)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 9)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Safety     Hybrid Journal   (Followers: 7)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 23)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 13)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 8)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access  
Teknik     Open Access  
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
The Structural Design of Tall and Special Buildings     Hybrid Journal   (Followers: 6)
Thin Films and Nanostructures     Full-text available via subscription   (Followers: 2)
Thin-Walled Structures     Hybrid Journal   (Followers: 4)
Transactions of the VŠB - Technical University of Ostrava. Construction Series     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Underground Space     Open Access  
Water Science & Technology     Partially Free   (Followers: 25)
Water Science and Technology : Water Supply     Partially Free   (Followers: 22)


Journal Cover Archives of Civil and Mechanical Engineering
  [SJR: 0.94]   [H-I: 19]   [1 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 1644-9665
   Published by Elsevier Homepage  [3048 journals]
  • 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
    • 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
    • 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
  • 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
  • An empirical examination of the thickness profile formation of
           twin-roll-cast magnesium strips
    • Authors: Claudia Kawalla; Michael Höck; Madlen Ullmann; Christian M. Ringle
      Pages: 227 - 234
      Abstract: Publication date: January 2018
      Source:Archives of Civil and Mechanical Engineering, Volume 18, Issue 1
      Author(s): Claudia Kawalla, Michael Höck, Madlen Ullmann, Christian M. Ringle
      The recently developed technology of twin-roll-cast (TRC) magnesium strips permits an efficient production of magnesium sheets, primarily for the automotive industry. The focus of the paper is to develop a structural equation model explaining the variance of the thickness profile formation. Hence, the complex and partially unknown relationships between twin-roll casting process parameters and the thickness profile formation are analyzed using latent variables, e.g. the deformation resistance, length of contact arc, etc., which consist of several observed parameters. The fundamental process variables and their effect on the thickness profile formation during twin-roll casting are investigated and evaluated by partial least squares structural equation modeling (PLS-SEM) – a statistical method that fits networks of constructs to empirical data. The results of the predictive modeling technique allow an approximation of the existing interrelationships between thickness profiles, rolling force as well as processes in the roll gap which are typically difficult to measure directly using sensors. In this context, it was identified that the thickness profile variation is primarily caused by the forming force, which is mainly driven by the length of contact arc. Moreover, implications for the control of the thickness profile are derived.

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

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

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

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

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

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

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

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

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

      PubDate: 2017-09-15T19:36:41Z
      DOI: 10.1016/j.acme.2017.06.007
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