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  Subjects -> ENGINEERING (Total: 2287 journals)
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ENGINEERING (1206 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 6)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 234)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 7)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 30)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 15)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 8)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 259)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 181)
Composites Part B : Engineering     Hybrid Journal   (Followers: 236)
Composites Science and Technology     Hybrid Journal   (Followers: 216)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 14)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 58)

        1 2 3 4 5 6 7 | Last

Journal Cover Composites Part B : Engineering
  [SJR: 2.125]   [H-I: 75]   [236 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1359-8368
   Published by Elsevier Homepage  [3044 journals]
  • Sound transmission loss of composite and sandwich panels in thermal
           environment
    • Abstract: Publication date: 15 January 2018
      Source:Composites Part B: Engineering, Volume 133
      Author(s): Xiangyang Li, Kaiping Yu, Rui Zhao, Jingyong Han, Haiyang Song
      Composite sandwich structures are extensively applied in automotive, marine, aircraft because of superior stiffness-to-weight ratios. These structures are invariably exposed to the thermal and noise environment in their service life especially as a component of the hypersonic aircraft. The paper is originally focused on the sound transmission loss (STL) of the sandwich panels constituted of orthotropic materials in thermal environment. Firstly, the governing equations are obtained by applying Hamilton's principle. Both the natural frequencies and corresponding mode functions are derived with thermal stresses taking into account. The formulation of STL is obtained by using the mode superposition method. Then the published experimental result and numerical simulation are demonstrated to validate the accuracy of the analytical solution. Finally, the influences of temperature, elevation angle and azimuth angle of incident sound on the STL of finite sandwich panels are investigated systematically. It is observed that natural frequencies of the panel decrease and peaks of the STL tend to drop and flow to the lower frequencies with the increment of the temperature. The STL decreases with the increment of the elevation angle.

      PubDate: 2017-09-20T05:44:11Z
       
  • Mechanical properties and self-healing evaluation of strain-hardening
           cementitious composites with high volumes of hybrid pozzolan materials
    • Abstract: Publication date: 15 January 2018
      Source:Composites Part B: Engineering, Volume 133
      Author(s): Chung-Chan Hung, Yen-Fang Su, Yu-Min Su
      The study investigates the self-healing performance and mechanical behavior of strain-hardening cementitious composites (SHCCs) incorporating high volumes of blended ground-granulated blast-furnace slag and fly ash (GGBS-FA SHCCs). The prepared SHCC specimens are pre-cracked by imposing a 0.5% or 1% tensile strain at the age of 180 days, and then exposed to lab-controlled dry, water immersion, or natural weathering conditions for 90 days. Multiple performance evaluation approaches are employed, including compressive tests, tensile tests, resonant frequency measurements, scanning electron microscopy, and energy dispersive x-ray analysis. In comparison with the performance of SHCCs without GGBS, blending GGBS and fly ash in SHCCs is shown to improve the tensile and compressive strengths at 7, 28, and 90 days, while the strain capacity and the multiple narrow cracking pattern of SHCCs are weakened. Furthermore, the SHCCs with blended GGBS and fly ash have enhanced self-healing performance compared to the SHCCs incorporating only fly ash.

      PubDate: 2017-09-20T05:44:11Z
       
  • A partial-interaction approach for extracting FRP-to-concrete bond
           characteristics from environmentally loaded flexural tests
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Hasret Aydin, Rebecca J. Gravina, Phillip Visintin
      Bonding fibre-reinforced polymers (FRP) to reinforced concrete (RC) members has become a popular means for enhancing load-carrying capacity and extending service life. However, the long-term durability of flexurally strengthened members remains uncertain. In this paper, a numerical solution to a previously developed partial-interaction (PI) moment-rotation approach for intermediate crack (IC) debonding in FRP-strengthened RC flexural members is applied to a set of test results in published literature to extract bond characteristics. This is significant in four respects: (1) the model is based on fundamental PI theory, which directly simulates the formation and widening of cracks associated with the tension-stiffening mechanism, and explicitly allows for any changes at bond interfaces due to environmental loading or corrosion of the steel reinforcement. (2) The model also simulates the mechanism of compressive concrete softening should it occur prior to the complete debonding of FRP laminates. (3) Changes to local bond characteristics at the FRP-to-concrete interface due to environmental loading can be quantified by matching the experimental load-deflection response of deteriorated members. (4) The approach can be applied to a wide range of flexural test data, so as to broaden the bounds of bond-slip models, which are otherwise limited to the bounds of shear bond tests. Using the approach, a set of bond characteristic deterioration factors, derived from full-range load-deflection responses of environmental loaded flexural members, indicate that bond deterioration at the FRP-to-concrete interface generally compromises the ductility and strength of flexural members.

      PubDate: 2017-09-20T05:44:11Z
       
  • Atomistic study of interfacial creep behavior in epoxy-silica bilayer
           system
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Wei Jian, Lik-ho Tam, Denvid Lau
      Epoxy-bonded bilayer material systems are commonly used in various engineering applications. The mechanical durability of these material systems are generally related to the interfacial properties between the bonded materials, which have aroused great concern for ensuring the long-term performance. In this paper, the interfacial creep behavior in bilayer system consisting of SU-8 monomer and silica substrate is investigated using molecular dynamics simulations. The threshold stress is found for the onset of interfacial creep in bilayer material system. The relationship between creep displacement and applied constant force is quantified by an analytical model. The microstructural changes during creep process are captured to demonstrate creep deformation process, including extension and sliding movement of epoxy, which unravels the mechanism of creep behavior at atomistic level. This study provides a new approach to understand the creep deformation at the nanoscale, and the corresponding molecular dynamics simulations show the promising results to obtain the information of the interfacial creep behavior in the bilayer material system.
      Graphical abstract image

      PubDate: 2017-09-20T05:44:11Z
       
  • Investigations for mechanical properties of Hap, PVC and PP based 3D
           porous structures obtained through biocompatible FDM filaments
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Ravinder Sharma, Rupinder Singh, R. Penna, F. Fraternali
      In last two decades fused deposition modelling (FDM) has emerged as a standout amongst the most broadly utilized process for fabrication of 3D functional parts in bone tissue engineering. However this technique is still facing substantial problems to produce porous structure having sufficient mechanical strength. In this present research an exertion has been made to develop a bio-compatible FDM filament which has been further used to fabricate 3D porous structure. The results of the study highlighted the effect of FDM process parameters (infill percentage, infill speed and layer thickness) on the tensile properties (percentage elongation at peak, percentage elongation at break and yield stress) of the 3D functional prototypes. It has been observed that infill percentage has major contribution i.e. 92% towards peak elongation, 91% towards break elongation and 80% towards yield stress. The remaining two parameters have very less contribution towards mechanical properties of the 3D structures. For microscopic analysis the microphotographs of scanning electron microscope (SEM) have been taken to ensure the structure produced is porous enough and can be used in a variety of engineering and biomedical applications.

      PubDate: 2017-09-20T05:44:11Z
       
  • Friction welding for the manufacturing of PA6 and ABS structures
           reinforced with Fe particles
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Ranvijay Kumar, Rupinder Singh, I.P.S. Ahuja, Ada Amendola, Rosa Penna
      In the present work PA6 matrix reinforced with metal powder (Fe) has been joined by friction welding with ABS matrix reinforced with Fe powder for structural applications (like: joining of pavement sheets, assembly of pipe lines etc.). The melt flow index (MFI) of PA6+Fe powder was put approximately equivalent to MFI of ABS + Fe powder by varying the proportion of Fe powder in PA6 and ABS matrix. After fixing proportion of Fe powder in PA6 and ABS material, these materials were used for preparation of feed stock filament of fused deposition modelling filament (FDM) by screw extrusion process. Finally two FDM filaments of PA6+Fe powder and ABS + Fe powder were fed into FDM machine independently. The functional prototypes of circular cross-section were prepared on FDM machine (one with filament of PA6+ Fe powder and second with ABS + Fe powder). These geometrical shapes of two dissimilar plastic/polymer materials were used on friction welding setup. Finally under best parametric conditions of feed, rpm etc. these reinforced polymer materials were successfully joined. This study provides a response surface methodology (RSM) based statistical model for enhancing the weldability of dissimilar polymer materials (as an alternative method) with improved mechanical/metallurgical properties.

      PubDate: 2017-09-20T05:44:11Z
       
  • Nonlocal strain gradient shell model for axial buckling and postbuckling
           analysis of magneto-electro-elastic composite nanoshells
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): S. Sahmani, M.M. Aghdam
      The present study deals with the size-dependent nonlinear buckling and postbuckling characteristics of magneto-electro-elastic cylindrical composite nanoshells incorporating simultaneously the both of hardening-stiffness and softening-stiffness size effects. To accomplish this purpose, the nonlocal strain gradient elasticity theory is applied to the classical shell theory. Via the virtual work's principle, the size-dependent governing differential equations are constructed including the coupling terms between the axial mechanical compressive load, external magnetic potential and external electrical potential. The nonlinear prebuckling deformations and the large postbuckling deflections are taken into consideration based upon the boundary layer theory of shell buckling. Finally, an improved perturbation technique is employed to achieve explicit analytical expressions for nonlocal strain gradient stability curves of magneto-electro-elastic nanoshells under various surface electric and magnetic voltages. It is seen that a positive electric potential and a negative magnetic potential cause to increase both of the nonlocality and strain gradient size dependencies in the nonlinear instability behavior of axially loaded magneto-electro-elastic composite nanoshells, while a negative electric potential and a positive magnetic potential play an opposite role.

      PubDate: 2017-09-20T05:44:11Z
       
  • In-vitro studies of SS 316 L biomedical implants prepared by FDM, vapor
           smoothing and investment casting
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Daljinder Singh, Rupinder Singh, K.S. Boparai, Ilenia Farina, Luciano Feo, Anita Kamra Verma
      The function of biomedical implant is to replace the biological parts/limbs in body. Among various materials, metals and alloys like titanium, stainless steel (SS) are used as biomedical implants due to their superior mechanical properties, considerable bio-compatibility and easy manufacturing. In the present study, implants of SS 316L have been made with the combination of three processes namely fused deposition modelling, vapor smoothing and investment casting. Further, in-vitro test has been performed on the implants in order to analyze its corrosion behavior and bio-compatibility, to check its applicability and to verify the effect of manufacturing processes on its corrosion properties.

      PubDate: 2017-09-14T05:29:55Z
       
  • Influence of matrix ductility and toughness on strain energy release rate
           and failure behavior of woven-ply reinforced thermoplastic structures at
           high temperature
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): B. Vieille, M. Chabchoub, C. Gautrelet
      The purpose of the present work is to investigate damage evolution in 5-harness satin weave carbon fabric reinforced PolyPhenylene Sulphide (PPS) structures with an initial edge notch. To understand how the physical properties of the constituents (e.g. matrix toughness and ductility) and the architecture of reinforcement (woven-ply) affect the fracture behavior of C/PPS laminates, it is useful to have analytical representation of the translaminar failure modes based on fracture mechanics concepts, the strain energy release rate G especially. Translaminar failure is determined by the combination of loading, location of defect and material heterogeneity (presence of matrix-rich regions at the crimp area in woven-ply laminates). When translaminar failure is initiated from an existing notch, a sequence of energy-absorbing events (fiber breakage, matrix cracking, fibers pull-out, fiber/matrix debonding) occurs in a region surrounding the notch tip. The knowledge of energy-absorbing processes is therefore important since they are responsible for the toughness of the composite. Depending on laminates' stacking sequence, the contribution of matrix behavior to strain energy release rate can be evaluated during damage in both brittle and ductile composite laminates subjected to high temperature conditions (T > Tg) when matrix ductility and toughness are enhanced. Depending on the initial notch orientation (0 or 45°), the failure mode is either a mode I or a mixed mode (I + II). The acoustic energy associated with translaminar failure was correlated with the strain energy release rate during translaminar failure. The total strain energy release rate in quasi-isotropic (QI) laminates is 6 times as low as in angle-ply (AP) laminates, suggesting that large plastic deformation (due to a matrix-driven behavior and an enhanced matrix ductility at T > Tg) are instrumental in dissipating a great portion of the mechanical energy brought to the specimen in AP laminates. The “material” effect is combined with a structural one (rotation of the fibers) at the crack tip, and leads to ductile failure. Both effects contribute to high fracture toughness in AP laminates.

      PubDate: 2017-09-14T05:29:55Z
       
  • Facile fabrication of boron and nitrogen co-doped carbon@Fe2O3/Fe3C/Fe
           nanoparticle decorated carbon nanotubes three-dimensional structure with
           excellent microwave absorption properties
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Bo Zhong, Chaojun Wang, Guangwu Wen, Yuanlie Yu, Long Xia
      Herein, we report a facile process to massively synthesize three-dimensional (3D) boron and nitrogen co-doped carbon@Fe2O3/Fe3C/Fe nanoparticle decorated carbon nanotubes (B/N co-doped C@Fe2O3/Fe3C/Fe-CNTs). The fabrication involved a simple one-step chemical vapor deposition process. These as-synthesized 3D B/N co-doped C@Fe2O3/Fe3C/Fe-CNTs based absorbers exhibited excellent microwave absorption properties with tunable strong absorption wavebands in the frequency range of 2–18 GHz. A minimum reflection loss (RL) value of −42.6 dB was observed at 6.88 GHz with absorber thickness of 3.5 mm. Moreover, the absorption bandwidth for RL less than −10 dB was as large as 4.14 GHz when the absorber thickness dropped to 2.0 mm. A possible absorption mechanism was proposed in detail, which can be attributed to the synergy of the impedance matching and enhancement of multiple reflection among 3D B/N co-doped C@Fe2O3/Fe3C/Fe nanoparticles.
      Graphical abstract image

      PubDate: 2017-09-14T05:29:55Z
       
  • Determination of the excitation frequencies of laminated orthotropic
           non-homogeneous conical shells
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): A.H. Sofiyev, N. Kuruoglu
      The excitation frequencies of parametric vibration of laminated non-homogeneous orthotropic conical shells (LNHOCSs) under axial load periodically varying with time, are determined using the classical shell theory (CST). The basic equations are found using the Donnell-Mushtari shell theory and reduce to the Mathieu-Hill type differential equation, in which the instability is examined by the Bolotin method. To validate of current results was made a comparison with the previous studies. The effects of stacking sequences, axial load factors, non-homogeneity, as well as the variation of geometric characteristics on the backward and forward excitation frequencies (BFEFs) of conical shells are studied in detail.

      PubDate: 2017-09-14T05:29:55Z
       
  • Alkali activated waste fly ash as sustainable composite: Influence
           of curing and pozzolanic admixtures on the early-age physico-mechanical
           properties and residual strength after exposure at elevated temperature
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): MessinaFeroneColangeloRovielloCioffi
      Waste fly ash, referred in literature also as “weathered”, represents a major management issue for coal-fired power plants. The low qualification of this relevant fraction of produced fly ash is not adequate for recycling in structural concrete. Non-structural applications may represent an economically feasible solution to maximize the recovery of coal fly ash from power plants. A potentially valuable recycling track may be represented by alkaline activation for the production of sustainable precast elements based on geopolymeric binders. In this work, three mineral admixtures, namely blast furnace slag, silica fume and metakaolin, were used to synthesize binary alkali activated binders whose major volumetric fraction was waste fly ash. Three curing temperatures (20, 40, 60 °C) were also considered. Early age kinetics and properties development were assessed by means of strength development and ultrasonic pulse velocity. Residual compressive strength after exposure at high temperature was also assessed in order to highlight typical geopolymeric thermal resistance which is generally observed for higher value raw materials. Furthermore, microstructural analysis was carried out by means of scanning electron microscopy. Silica fume exhibited an increasing detrimental effect (formation of agglomerates/partial foaming) with early age curing temperature, while blast furnace slag and metakaolin revealed to be effective admixtures without strict need of higher curing temperatures.

      PubDate: 2017-09-14T05:29:55Z
       
  • Comparison of carbon nanotubes and graphene oxide coated carbon fiber for
           improving the interfacial properties of carbon fiber/epoxy composites
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Xuming Yao, Xinyu Gao, Jianjun Jiang, Chumeng Xu, Chao Deng, Junbiao Wang
      By designing the fiber/matrix interface, the properties of the carbon fiber-reinforced composite can be changed significantly. In this work, carboxylic-functionalized carbon nanotubes (CNTs) and graphene oxide (GO) were separately deposited on the carbon fiber (CF) surface to increase the interfacial properties of composites. The properties of fibers such as the surface topography, surface chemical composition and surface energy were examined, and the interfacial shear strength between the fibers and the matrix was examined using a microdroplet test. In addition, CNT-coated, GO-coated and pristine unidirectional carbon fiber fabrics were used to manufacture CF/epoxy composites via the vacuum-assisted resin transfer molding method, and their moisture absorption and interlaminar shear strength were measured. The results reveal that both CNTs and GO can significantly improve the interfacial properties of composites. The CNT/CF-reinforced composites have higher shear strength, and the GO/CF-reinforced composites have better humidity resistance. The interfacial reinforcing mechanisms of the composites with CNTs and GO were compared.

      PubDate: 2017-09-14T05:29:55Z
       
  • Design and characterization of radar absorbing structure based on
           gradient-refractive-index metamaterials
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Lixian Yin, Jonathan Doyhamboure--Fouquet, Xiaoyong Tian, Dichen Li
      A gradient-refractive-index radar absorbing structure(GRINRAS) for stealth aircraft is proposed in this paper. It is a layered shell composed of a gradient-refractive-index (GRIN) refractor, an absorber and a reflector. The GRIN refractor consists of the isotropic non-resonant woodpile metamaterials, which was designed according to the permittivity distribution equation of the electromagnetic(EM) black hole to bend and match the waves from the air to the radar absorbing structure. The absorber dissipates the EM waves and transforms them into the heat energy. The reflector reflects the EM waves to the absorber and prevents them from entering the inner space of the structure. A ring and a board GRINRAS were designed, and then fabricated by the three-dimensional (3D) printing process of stereolithography (SL). Simulation and experimental results show that the GRINRASes can control the wave propagation and their absorption capacity is better than −10 dB in the broadband of 12–18 GHz. The GRIN refractor and the absorber have almost equal contributions to the absorption capability. This is the first radar absorbing composite structure composed of the gradient 3D metamaterials. It demonstrates the feasibility of using the metamaterials and 3D printing technology in the innovative radar absorbing structure (RAS) of the stealth aircraft.
      Graphical abstract image

      PubDate: 2017-09-14T05:29:55Z
       
  • Morphology controllable microwave absorption property of polyvinylbutyral
           (PVB)-MnO2 nanocomposites
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Pritom J. Bora, Irthasa Azeem, K.J. Vinoy, Praveen C. Ramamurthy, Giridhar Madras
      This work reports the synthesis of polyvinylbutyral (PVB)-MnO2 nanocomposites and their microwave absorption property. Anisotropic nanoparticles loaded polymer nanocomposites have better dielectric properties. Therefore, to investigate the morphology controlled microwave absorption property, MnO2 nanorods and MnO2 nanospheres were synthesized by low temperature chemical precipitation method and PVB-MnO2 nanocomposites were solution processed. The microwave absorption of PVB was enhanced by MnO2 nanorods compared to MnO2 nanospheres, for both X-band (8.2–12.4 GHz) and Ku-band (12.4–18 GHz). The lowest reflection loss (RL) of PVB-MnO2 nanorod composites was found to be - 37 dB with a large bandwidth at the thickness of 2 mm while PVB-MnO2 nanosphere composites show almost a linear decrease of RL with a minimum value −10 dB. It was observed that the enhancement of electromagnetic attenuation constant (α) and dielectric loss is the major factor responsible for the enhanced microwave absorption of PVB-MnO2 nanorod composite. Further, morphology controls the microwave absorption property of PVB-MnO2 nanocomposites through effective permittivity, degree of EM impedance matching (Δ), antenna mechanism, and dielectric dissipation that enhances high loss factor (LF %). The obtained high LF (84%) of PVB-MnO2 nanorod composite indicates the excellent microwave absorption property and can be treated as a novel coating polymer nanocomposite for microwave absorption based applications.

      PubDate: 2017-09-14T05:29:55Z
       
  • In-plane frictional resistances in dry block masonry walls and
           rocking-sliding failure modes revisited and experimentally validated
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): C. Casapulla, L.U. Argiento
      This paper presents new findings in the assessment of the lateral strength of dry block masonry walls under in-plane loading, based on an existing macro-modelling approach using limit analysis methods. The evaluation of the in-plane frictional resistances activated at the onset of the rocking-sliding mechanisms is revisited and two equivalent formulations accounting for the self weight of the wall and additional loads are presented. The accuracy and robustness of the analytical results are assessed by experimentally testing both the resultant frictional resistances and their applications points. The solution procedure of the previous macro-block model providing upper and lower bounds for the ultimate load factor is also reconsidered and the computation of the “exact” load factor falling within the range is proposed. A satisfactory comparison is found with a micro-block and other macro-block models existing in the literature. This comparison is carried out through a parametric analysis, in terms of both the load factor and the failure mode and with reference to the effects of chosen parameters (wall aspect, unit aspect, unit size ratios and overload) on the load factor.

      PubDate: 2017-09-14T05:29:55Z
       
  • Diameter-dependent elastic properties of carbon nanotube-polymer
           composites: Emergence of size effects from atomistic-scale simulations
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): M. Malagù, M. Goudarzi, A. Lyulin, E. Benvenuti, A. Simone
      We propose a computational procedure to assess size effects in nonfunctionalized single-walled carbon nanotube (CNT)-polymer composites. The procedure upscales results obtained with atomistic simulations on a composite unit cell with one CNT to an equivalent continuum composite model with a large number of CNTs. Molecular dynamics simulations demonstrate the formation of an ordered layer of polymer matrix surrounding the nanotube. This layer, known as the interphase, plays a central role in the overall mechanical response of the composite. Due to poor load transfer from the matrix to the CNT, the reinforcement effect attributed to the CNT is negligible; hence the interphase is regarded as the only reinforcement phase in the composite. Consequently, the mechanical properties of the interface and the CNT are not derived since their contribution to the elastic response of the composite is negligible. To derive the elastic properties of the interphase, we employ an intermediate continuum micromechanical model consisting of only the polymer matrix and a three-dimensional fiber representing the interphase. The Young's modulus and Poisson's ratio of the equivalent fiber, and therefore of the interphase, are identified through an optimization procedure based on the comparison between results from atomistic simulations and those obtained from an isogeometric analysis of the intermediate micromechanical model. Finally, the embedded reinforcement method is employed to determine the macroscopic elastic properties of a representative volume element of a composite with various fiber volume fractions and distributions. We then investigate the role of the CNT diameter on the elastic response of a CNT-polymer composite; our simulations predict a size effect on the composite elastic properties, clearly related to the interphase volume fraction.

      PubDate: 2017-09-14T05:29:55Z
       
  • Cover 2: Editorial Board
    • Abstract: Publication date: 1 December 2017
      Source:Composites Part B: Engineering, Volume 130


      PubDate: 2017-09-14T05:29:55Z
       
  • Influence of thermal conditioning on tensile behaviour of single basalt
           fibres
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Fabrizio Sarasini, Jacopo Tirillò, Maria Carolina Seghini
      This article presents an experimental investigation of the effects of temperature and atmosphere on the tensile behaviour of basalt fibres. The heating conditions have been chosen in order to mimic those used in thermal recycling of polymer matrix composites. The change of properties is investigated at room temperature on fibres heat-treated for 1 h up to 600 °C in air and in inert atmosphere (argon). The loss in fibre strength was found to be affected by both temperature and atmosphere with a significant strength loss occurring under the heating conditions used for high temperature incineration of polymer composites. Scanning electron images of fibre fracture surfaces after tensile tests for different environments and temperatures confirmed that failure originated from the fibre surface. The modulus of thermally-treated basalt fibres increased with conditioning temperature and these effects have been discussed in terms of decomposition of the organic sizing and structural relaxation during thermal treatment while X-ray diffraction excluded the effect of crystallization phenomena on the strength loss of basalt fibres after thermal exposure.

      PubDate: 2017-09-08T07:37:27Z
       
  • Carbon from waste source: An eco-friendly way for strengthening polymer
           composites
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Aamer Khan, Pravin Jagdale, Massimo Rovere, Marc Nogués, Carlo Rosso, Alberto Tagliaferro
      Carbon nano materials (CNMs) from waste polyethylene bags were synthesized in two different morphologies namely carbon nano beads (P1) and a mix of carbon nano tubes and carbon nano beads (P2) using chemical vapour deposition (CVD) technique. Morphology of the CNMs were studied through field emission scanning electron microscope (FESEM) and the purity through thermogravimetric analysis (TGA) and Raman spectroscopy. Epoxy composites were produced using these CNMs as filler in 1% and 3% by weight. Mechanical properties and tribological properties were compared with the composites of commercial Multi Walled Carbon Nano Tubes (MWCNT). It is observed that the in house generated CNMs composites show overall better mechanical and tribology properties compared to the blank epoxy and the commercial MWCNTs based composites. Morphology of the composites was analysed through FESEM to study the interaction of the filler with the matrix that lead to improved performances.
      Graphical abstract image

      PubDate: 2017-09-08T07:37:27Z
       
  • A validation of a modified Paris relation for fatigue delamination growth
           in unidirectional composite laminates
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Liaojun Yao, Yi Sun, Licheng Guo, Liyong Jia, Meiying Zhao
      The aim of this paper is to provide evidence on the validation of a modified Paris relation in fatigue crack growth with fibre bridging. Energy principles were first applied to investigate energy release in fatigue delamination growth. A comparison between the Paris and the modified Paris relations was completed subsequently. The application of the Paris relation can artificially cause different resistance curves of fatigue delamination with fibre bridging, violating the hypothesis of similitude and the energy dissipation results. However, the use of the modified Paris relation can result in a master resistance curve, which is physically consistent with the law of similitude and the energy release regulations. This derives from using an appropriate similitude parameter in data reduction. It is therefore reasonable to use the strain energy release rate (SERR) actually applied on the crack front, rather than the total applied SERR, as similitude to correlate fatigue crack growth. The master resistance curve was finally employed to predict fatigue results from literature. Acceptable agreement between predictions and experiments was achieved, validating the effectiveness of the modified Paris relation in determining fatigue crack growth with fibre bridging.

      PubDate: 2017-09-08T07:37:27Z
       
  • Nonlinear dynamic responses of fiber-metal laminated beam subjected to
           moving harmonic loads resting on tensionless elastic foundation
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Yang Chen, Yiming Fu, Jun Zhong, Chang Tao
      The nonlinear dynamic responses of the fiber-metal laminated beam resting on a tensionless elastic foundation and subjected to a moving harmonic load and thermal load are investigated in the paper. The beam-foundation interaction force that only reacts in compression is established by introducing the hyperbolic tangent function, and the steady temperature field is deduced by solving the one-dimensional steady-state heat transfer equation. The nonlinear governing equations are derived by application of Hamilton principle and solved by finite difference method, Newmark method and Newton-Raphson method. In numerical results, FML beams constrained by different boundary conditions are selected to reveal the dynamic properties of FML beams. The effects of some parameters are discussed in detail, and some meaningful conclusions are concluded.

      PubDate: 2017-09-08T07:37:27Z
       
  • Controlled evolution of surface patterns for ZnO coated on stretched PMMA
           upon thermal and solvent treatments
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Haibao Lu, Yingzhi Liu, Wei Min Huang, Changchun Wang, David Hui, Yong Qing Fu
      Poly (methyl methacrylate) (PMMA) possesses the excellent optical properties and thermal stabilities, its shape memory effect can be triggered by heating or solvent absorption. Zinc oxide (ZnO) films, the most common semiconductor materials, were usually deposited on polymer substrates as a transparent conductive element for applications to electro-optical devices. In this paper, ZnO films with different thicknesses were deposited on PMMA substrates with different pre-strains. The influences of the shape memory effect (SME), thermal expansion mismatch, and ethanol soaking on the evolutions of surface topographies were systematically investigated. Results revealed that the isotropic wrinkles without any preferential orientation were induced by the thermal expansion coefficient mismatch between ZnO film and PMMA substrate during annealing. The well-aligned wrinkles perpendicular to the direction of pre-strain resulted from the SME of PMMA triggered by heating. In addition, cracks appeared instead of wrinkles since the isotropic swelling of PMMA upon soaking in ethanol.

      PubDate: 2017-09-02T07:34:21Z
       
  • Characterization and application of a natural polymer obtained from
           Hydrangea macrophylla as a thermal insulation biomaterial
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Juan Pablo Cárdenas-R, Mara Cea, Katherinne Santín, Gonzalo Valdés, Renato Hunter, Rodrigo Navia
      Thermal insulation materials play a significant role in improving the energy efficiency of buildings and therefore many studies focus their efforts on developing low environmental impact materials. In this context, the aim of this work was to study a natural polymer obtained from Hydrangea Macrophylla (HM) and its application as a thermal insulation material. The natural polymer was chemically, physically and mechanically characterized and compared to polyurethane (PU) and expanded polystyrene (EPS). In addition, a composite material blended in a mold using HM stems and sprayed with PU was used to evaluate possible applications. The results obtained from morphological studies conducted on HM showed it to be an interesting natural porous structure with a smooth surface similar to those found in closed cell insulation materials and highly compatible with PU foam. This composite showed good thermal stability, an outstanding thermal conductivity for a natural insulation material, high density and good behavior under compression. HM polymer in a PU matrix like a block type was shown to be an appropriate thermal insulation material, providing an excellent opportunity to reduce the environmental impacts of these types of insulating foams.

      PubDate: 2017-09-02T07:34:21Z
       
  • On folding mechanics of multi-cell thin-walled square tubes
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Zhonggang Wang, Jiefu Liu, Song Yao
      Multi-cell metallic thin-walled tubes have gained wide popular in recent years, due to their significantly improvements in mechanical behaviors comparing with general single sample. In this investigation, some attempts to learn of the mechanism of folding process of multi-cell thin-walled square tubes were carried out. The half-wave length has been fully determined theoretically by the means of Super Folding Element. The relationship between the half-wave length as well as mean load versus cell amounts has been given. Afterwards, comprehensive numerical simulations were also conducted after necessary experimental validation, with the cell amounts range from 1 × 1 to 15 × 15 which have the equal weight but different thickness. Detailed evolutional process of deformation mode, half-wave length, and energy absorption capability were analyzed parametrically. The results turned out that the vital influence factor on mechanical properties of multi-cell tubes directly lies in the half-wave length caused by different cell amounts. With the increasing of cells, the half-wave length decreases while the energy absorption capability promotes. Evidently promotion can be observed compared with general single cell tube. All these achievements shed a light on disclosing the multi-cell effect on mechanical properties.

      PubDate: 2017-09-02T07:34:21Z
       
  • Development and mechanism of ultralow dielectric loss and toughened
           bismaleimide resins with high heat and moisture resistance based on unique
           amino-functionalized metal-organic frameworks
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Xianchao Han, Li Yuan, Aijuan Gu, Guozheng Liang
      High dielectric loss is the main factor that leads to easy aging and low service reliability of electronic and insulation products. Herein, novel heat and moisture-resistant bismaleimide (BD) resins with ultralow dielectric loss and high toughness were developed through synthesizing unique amino-functionalized metal-organic framework (sN-MIL) with small pore diameter and low specific surface. The addition of only 0.3 wt% sN-MIL into BD resin effectively improves impact strength and fracture toughness to about 1.70 times; meanwhile significantly reducing dielectric loss to only 0.0004 (100 Hz), which is almost the lowest dielectric loss reported among porous filler/polymer composites. The origin behind these attractive performances of sN-MIL/BD composites was intensively discussed.
      Graphical abstract image

      PubDate: 2017-09-02T07:34:21Z
       
  • Analysis of the 3D draping behavior of carbon fiber non-crimp fabrics with
           eddy current technique
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Georg Bardl, Andreas Nocke, Matthias Hübner, Thomas Gereke, Matthias Pooch, Martin Schulze, Henning Heuer, Marko Schiller, Richard Kupke, Marcus Klein, Chokri Cherif
      Assessing and controlling the complex deformation behavior of textile reinforcements fabrics remains one of the major challenges in the production of fiber-reinforced plastics. In this paper, the draping of +45°/-45° biaxial non-crimp fabrics to a hemispherical shape is investigated with an eddy current imaging technique. After an automated draping process, the textiles are scanned with a robot-guided eddy current measurement system. From the resulting conductivity maps of the samples, the local yarn directions are extracted by image analysis and the paths of individual yarns are reconstructed for both the upper and the lower layer. Experiments are carried out for different forming speeds, blank holder forces and different non-crimp fabric parameters (stitch length, stitch type, stitch tension and yarn count). The influences of these parameters are compared and discussed, with the conclusion that blank holder forces have by far the most significant influence on the draping result. Sample experimental results are compared to results from an FEM draping simulation.

      PubDate: 2017-09-02T07:34:21Z
       
  • Evaluation of the thermal, mechanical and dynamic mechanical
           characteristics of modified graphite nanoplatelets and graphene oxide
           high-density polyethylene composites
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): Sean Lin, Muhammad A.S. Anwer, Yannan Zhou, Apoorv Sinha, Luke Carson, Hani E. Naguib
      The effectiveness of graphitic nanoplatelets (GNPs) and graphene oxide (GO) as reinforcing fillers in a high-density polyethylene (HDPE) matrix was evaluated based on morphological, tensile, dynamic mechanical, and thermal property improvements over the neat polymer. Simple melt compounding and injection moulding were used for sample fabrication. Filler loadings ranged from 0.1% to 10% for GNP, and 0.05%–1.5% for GO. Improvements in mechanical properties were observed in both composites for all investigated filler loadings, though more pronounced in the GNP composites, which saw a 56% increase in elastic modulus and 23% increase in maximum stress over neat HDPE for the 10% GNP composite. A slight increase in crystallization temperature was observed for the GNP composites, while a similar drop in melting point was recorded for both systems. SEM imaging revealed that agglomeration was present in both composites, though dispersion was better for the GNP/HDPE composites.

      PubDate: 2017-09-02T07:34:21Z
       
  • Hybrid composites manufactured by resin infusion with a fully recyclable
           bioepoxy resin
    • Abstract: Publication date: 1 January 2018
      Source:Composites Part B: Engineering, Volume 132
      Author(s): G. Cicala, E. Pergolizzi, F. Piscopo, D. Carbone, G. Recca
      Bioepoxy based monomers were formulated with a cure inhibitor and a cleavable amine to obtain a recyclable epoxy system suitable for resin infusion at room temperature. Hybrid flax/carbon fiber layup were used. Tensile, flexural and dynamo-mechanical properties for the composites were studied. The cured laminates were chemically recycled obtaining from the epoxy matrix a thermoplastic. The recycled was processed by fused deposition modelling (FDM) and injection molding after mixing with short kenaf fibers.

      PubDate: 2017-09-02T07:34:21Z
       
  • Absorption and mechanical properties of SiCp/PVDF composites
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Qiong Wu, Lei Li, Yi-Du Zhang, Wei Jia Shui
      The wide utilization of stealth technology in military has increased the interest for composite materials that possess good absorption properties and mechanical behaviors. This study examined the composites of polyvinylidene fluoride (PVDF) and silicon carbide particles (SiCps) produced through blending and hot-molding technique. The absorption properties of SiCp/PVDF composite material film and the mechanical performance of composites, which are the main influencing factors in the practical applications of the present SiC composites, were primarily investigated. Given that the SiC particulates were transformed into solid spheres that were randomly distributed in the PVDF matrix, the mathematical model of the elastic modulus was obtained by using ANSYS Parameter Design Language (APDL). The elastic modulus of the composites was obtained by conducting a tensile experiment. The influence of mass fraction and size of SiC particles on the elastic modulus of SiCp/PVDF composites was determined by method of APDL simulation and tensile test. Results revealed the positive correlation between the SiCp mass percent and elastic modulus, whereas a negative correlation between the SiCp measure and elastic modulus. Thus, the most suitable mass fraction and size of SiCps were selected as a reference for engineering applications of the composites.
      Graphical abstract image

      PubDate: 2017-09-02T07:34:21Z
       
  • Mechanical characterization of a Low Density Sheet Molding Compound
           (LD-SMC): Multi-scale damage analysis and strain rate effect
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): M. Shirinbayan, J. Fitoussi, N. Abbasnezhad, F. Meraghni, B. Surowiec, A. Tcharkhtchi
      This paper presents the results of an overall experimental characterization of the mechanical behavior of a Low Density Sheet Molding Compound (LD-SMC). LD-SMC is a polyester matrix containing mineral charge (CaCO3) reinforced by discontinuous bundles of glass fibers and Hollow Glass Microspheres (HGM). After a description of its specific microstructure using several experimental methods (notably a new ultrasonic method), the overall mechanical response of two microstructure configurations (Randomly Oriented (RO) and Highly oriented (HO)) is analyzed at both macroscopic and microscopic scales in the case of tensile and compression tests. HGMs are homogeneously distributed into the overall volume of the material. At the microscopic scale, in-situ tensile tests inside a SEM and fracture surfaces observations allows analyzing the specific damage mechanisms occurring during tensile and compression loading performed in the mold flow direction (HO-0°) and perpendicularly to it (HO-90°). A strong coupled influence of the presence of the HGM and fibers orientation has been emphasized. The results show that for HO-0° configuration fiber-matrix debonding appears to be the predominant damage mechanism, whereas for HO-90° configuration HGM-matrix debonding appears to be the predominant damage mechanism. High speed tensile tests are achieved using servo-hydraulic test equipment in order to study the strain rate effects (until 80 s−1) on mechanical macroscopic responses of HO-0°, RO and HO-90° samples. Strain rate has an obvious influence on the inelastic properties of LD-SMCs samples for all microstructures particularly on the damage threshold.

      PubDate: 2017-09-02T07:34:21Z
       
  • Investigation on structure and impact-resistance property of polyurethane
           foam filled three-dimensional fabric reinforced sandwich flexible
           composites
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Shih-Yu Huang, Ching-Wen Lou, Ruosi Yan, Qi Lin, Ting-Ting Li, Yueh-Sheng Chen, Jia-Horng Lin
      This study investigates the static-bursting and low-velocity impact property of the sandwich flexible composites. The sandwich flexible composites were composed of a three-dimensional (3D) fabric filled flexible polyurethane (PU) foam core, and two compound laminates as face sheet. Foam filled fabric reinforced sandwich flexible structure were designed to explore the effect on the static-bursting and low-velocity impact properties of the sandwich flexible composites. The results represent that the static-bursting strength of the foam could increase to 324% by reinforced with the filling-resistant 3D fabric. The fiber blending ratio of the filling resistant 3D fabric had a prominent influence on the static-bursting strength. Finally, the sandwich flexible composites with the filling resistant 3D fabric have great elongation that is favorable to the low-velocity impact strength.

      PubDate: 2017-09-02T07:34:21Z
       
  • Reinforced concrete beams strengthened in flexure with near-surface
           mounted (NSM) CFRP strips: Current status and research needs
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): S.S. Zhang, T. Yu, G.M. Chen
      The near-surface mounted (NSM) FRP strengthening technique has attracted worldwide attention as an effective alternative to the externally bonded (EB) FRP strengthening technique. In the NSM FRP strengthening method, grooves are first cut in the concrete cover of a concrete member for the FRP reinforcement to be inserted and embedded using an adhesive. The NSM FRP method has many advantages over the EB FRP method, including a higher bonding efficiency and a better protection of the FRP reinforcement. Existing experimental studies have shown that FRP strips owned a better bond efficiency compared with other section shapes (e.g. round bars and square bars), due to the fact that they had a larger perimeter-to-cross-sectional area ratio. This paper presents a state-of-the-art review, particularly on the flexural strengthening of RC beams with NSM CFRP strips. The observed failure modes in laboratory experiments of such FRP-strengthened RC beams are classified and the existing strength models are examined along with the failure mechanisms behind. The main knowledge gaps to be bridged in future studies are also identified. This review partially formed the basis of the development of design provisions on the NSM strengthening technique in the relevant Hong Kong design guideline.

      PubDate: 2017-09-02T07:34:21Z
       
  • Strain and damage monitoring in SBR nanocomposites under cyclic loading
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): G. Georgousis, K. Roumpos, E. Kontou, A. Kyritsis, P. Pissis, S. Koutsoumpis, M. Mičušík, M. Omastová
      In the present work a comparative study of the piezoresistivity behavior of two series of elastomeric nanocomposites, based on Styrene-Butadiene Rubber (SBR), reinforced with carbon black (CB) and carbon nanotubes (CNTs) has been performed. The relative resistance change with strain was recorded under monotonic and cyclic testing, revealing different response between CB and CNTs. The piezoresistivity response was more repeatable for the elastomeric nanocomposites which have been previously deformed and relaxed under zero stress. Moreover, the strain softening behavior of the materials under loading-unloading was examined by employing a rubber-softening empirical model developed in previous works.

      PubDate: 2017-09-02T07:34:21Z
       
  • Exact solutions for static analysis of laminated, box and sandwich beams
           by refined layer-wise theory
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): A. Pagani, Y. Yan, E. Carrera
      In the present work, a close-form solution based on a unified one-dimensional model is proposed and then applied to static response analyses of cross-ply laminated and sandwich beams subjected to simply supported boundary conditions. The hierarchical beam model is derived within the framework of the Carrera Unified Formulation (CUF), which makes use of Lagrange polynomials to express the three-dimensional (3D) displacement field via arbitrary order approximation of pure displacement variables at each layer over the cross section, in a Layer-Wise (LW) sense. The governing equations are derived via the principle of virtual work and a Navier-type close-form solution is employed to solve the resulting boundary value problem. Four benchmark numerical examples are carried out to demonstrate the efficiency of this novel method, including compact multi-layered cross-ply laminated beams, a thin-walled composite box beam and a composite sandwich-box beam. The results show that accurate displacement and stress components can be obtained as the order of the expansion increases, accompanied by a significant reduction in computational costs in comparison with the 3D finite element solutions. Besides, numerical cases in this research may be taken as benchmarks for future assessments in this field.

      PubDate: 2017-09-02T07:34:21Z
       
  • A new approach to the production of partially graded and laminated
           composite material composed of SiC-reinforced 7039 Al alloy plates at
           different rates
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Uğur Avci, Şemsettin Temiz


      PubDate: 2017-09-02T07:34:21Z
       
  • Multiscale modeling and analysis of graphene nanoplatelet/carbon
           fiber/epoxy hybrid composite
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): O. Aluko, S. Gowtham, G.M. Odegard
      The elastic response of Graphene Nano Platelet/carbon fiber/epoxy hybrid composite was investigated using multiscale modeling and analysis. The importance of volume fraction of graphene, GNP dispersion, and strain rates on the mechanical behaviors was determined. The analysis entailed the building of computational molecular dynamic model, involving multilayer graphene nano-platelets in epoxy composite, and micromechanical modeling. The predicted results show that the elastic responses of the hybrid composite increase with increased GNP volume fraction, dispersion, and strain rates.

      PubDate: 2017-09-02T07:34:21Z
       
  • Characterization of recycled thermoplastics-based nanocomposites:
           Polymer-clay compatibility, blending procedure, processing condition, and
           clay content effects
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Ruey Shan Chen, Sahrim Ahmad, Sinyee Gan
      Nanocomposites were prepared from recycled polyolefin and clay via melt-blending. The absence/presence of compatibilizer, the blending procedure, and the processing conditions were varied to study their independent effects. First, the compatibilizers ethylene-glycidyl methacrylate (E-GMA) and/or maleic anhydride polyethylene (MAPE) were incorporated with the clay. Second, the initial one-step blending procedure was replaced with a two-step blending procedure in the preparation of the rHDPE/rPET/clay/E-GMA nanocomposite. Third, the extrusion temperature profile and screw rotation speed (30, 60, 90, 120 and 150 rpm) were altered. The overall results from XRD analysis and flexural testing showed that a combination involving the E-GMA compatibilizer, the two-step blending procedure, a high extrusion temperature and a screw rotation speed of 90 rpm was the most effective for obtaining improved clay dispersion and increasing the flexural properties. In the final investigation, various nanoclay contents (1, 3, 5, 7 and 9 wt.%) were introduced. The results showed that the flexural properties, the dispersion of the clay, the thermal stability and the flammability resistance increased with the nanoclay content.

      PubDate: 2017-09-02T07:34:21Z
       
  • Thermal stress analysis of functionally graded plates with
           temperature-dependent material properties using theory of elasticity
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Munise Didem Demirbas
      Based on the three-dimensional elasticity theory, the transient thermal residual stress analyses of one-dimensional functionally graded rectangular plates (FGPs) have been performed under in-plane constant heat flux for different compositional gradient exponents. The thermo-mechanical properties of FGPs were assumed to be vary with a power law along an in-plane direction, not through the plate thickness direction and temperature-dependent/independent. The Heat Transfer and Navier's Equations in cartesian coordinates which represent the two-dimensional thermoelastic problem were resolved by means of the Finite-Difference Method (FDM), and the set of linear equations were solved using the pseudo singular value method. The effect of the coordinate derivatives of material properties were considered in both Heat Transfer and Navier's Equations. The current study aims at determining the effect of temperature dependence and temperature independence of material properties and the compositional gradient exponents in FGPs on the levels of temperature, strain and stress. The FGPs with temperature-dependent material properties showed higher levels of temperature, strain and stress than those with temperature-independent material properties. In order to verify the results of this study, two-dimensional thermo-elastic problem was resolved using the Finite Element Method (FEM) and the results are compared.

      PubDate: 2017-09-02T07:34:21Z
       
  • Novel sound insulation materials based on epoxy/hollow silica nanotubes
           composites
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Xuejun Shi, Jingyi Wu, Xiaoen Wang, Xingping Zhou, Xiaolin Xie, Zhigang Xue
      The performance of a sound insulation material is highly dependent on the technology adopted for its construction. In this study, we synthesized the hollow silica nanotubes (HSNTs) and used them as functional fillers to fabricate a sound insulation nanocomposite based on the epoxy. The sound transmission loss (STL) values of the nanocomposites were measured using a four-microphones standing wave tube. The results showed that for samples with thickness of 3 mm, the STL values of the pure epoxy resin and of nanocomposites with 3 wt% of HSNTs loading were 17 dB and 43 dB, respectively. When the thickness of the nanocomposite increased to 10 mm, the STL value increased to 57.9 dB. The improved sound insulation performances of nanocomposites have been attributed to the unique hollow structure of the hollow silica nanotubes. The mechanical properties and the thermal stability of the nanocomposites were also improved by adding HSNTs into the epoxy matrix.

      PubDate: 2017-09-02T07:34:21Z
       
  • A corrugated flexible composite skin for morphing applications
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): J.B. Bai, D. Chen, J.J. Xiong, R.A. Shenoi
      This paper deals with a novel corrugated flexible composite skin (FCS) for morphing application. The FCS is constructed with two thin-walled curved fibre-reinforced-plastics (FRP) composite shells which can be extended through pure elastic deformation during a large deformation process. Thus, the area of the FCS can be changed significantly. Geometrical equations are established for describing the extensional deformation of the FCS. Based on equilibrium equations and laminate theory, analytical solutions are derived for calculating the mechanical properties of the FCS in an extensional deformation process. In order to validate the FCS design and the analytical model, FCS specimens made from T300/5228 prepreg were fabricated using vacuum bag and co-bonding methods. Tensile tests on the FCS specimens were successfully carried out. Load versus displacement curves, tensile stiffness versus tensile load curves and relative deformation versus tensile load curves were measured. Comparisons between the theoretical predictions and the experiments were conducted. It is shown that the predictions using the new model correlates well with the experiments. The theoretical analysis and experimental validation thus show that the new FCS design was effective and feasible.

      PubDate: 2017-09-02T07:34:21Z
       
  • Fracture toughness and ductile characteristics of diglycidyl ether of
           bisphenol-A resins modified with biodegradable epoxidized linseed oil
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Yoon-Ji Yim, Kyong Yop Rhee, Soo-Jin Park
      Epoxidized linseed oil (ELO) was synthesized to improve the biodegradability and fracture toughness of the diglycidyl ether of bisphenol-A (DGEBA). The ELO was characterized using Fourier transform infrared (FT-IR) spectroscopy, gel permeation chromatography (GPC), and epoxy equivalent weight (EEW) tests. DGEBA was blended with ELO contents from 10 to 40 wt% to obtain a modified network. DGEBA and the DGEBA/ELO blends were characterized by their biodegradability, thermal properties, and fracture toughness. The thermal properties of the DGEBA/ELO blends were investigated using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The fracture toughness of the DGEBA/ELO blends was studied by measuring the Izod impact strength and the critical stress intensity factor (K IC). The morphologies were observed by scanning electron microscopy (SEM). In the biodegradability results, the DGEBA/ELO blends degraded 5% of the initial weight. The thermal property results confirmed that the crosslinking density of the epoxy networks decreased. The impact strength of the DGEBA/ELO blends was significantly improved with the addition of ELO owing to the reduced cross-linking density of the epoxy network.

      PubDate: 2017-09-02T07:34:21Z
       
  • High-speed 3D digital image correlation of low-velocity impacts on
           composite plates
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Mark Flores, David Mollenhauer, Vipul Runatunga, Timothy Beberniss, Daniel Rapking, Mark Pankow
      Composites are beginning to be used in a variety of different applications throughout industry. However, certification and damage tolerance is a growing concern in many aerospace and marine applications. Transverse impact of composites results in damage in the form of transverse matrix crack, delamination, fiber breakage and permanent deformation. Low-velocity impact experiments were conducted on 3.2 mm thick IM7/977-3 composites with 10 J of energy (1.888 m/s). High-speed digital photography was used to capture impact phenomenon of a composite's back surface. The specimens were speckled to perform 3D digital image correlation to analyze the displacements and strains that occurred on the back surface. The results from this study provide basic knowledge of the impact event such as deformation, strains, residual strains, damage threshold load, transverse matrix crack initiation and propagation.

      PubDate: 2017-09-02T07:34:21Z
       
  • Molecular dynamics simulations on adhesion of epoxy-silica interface in
           salt environment
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Yohannes L. Yaphary, Zechuan Yu, Raymond H.W. Lam, David Hui, Denvid Lau
      Epoxy-silica interface exists in various types of newly built as well as aging concrete structures which include flooring and anchoring systems. Sea environment and deicing salt often let the concrete structures be exposed to sodium chloride solution. It is observed from the laboratory evaluation that such exposure often leads to the poor bond durability of epoxy-concrete interface. Yet, there is still a lack of such fundamental understanding as the existing investigations are merely limited to macroscale or mesoscale. Indeed, bond at the interface is governed by the interactions between dissimilar materials lying at the atomistic scale, where atomistic modeling and molecular dynamics simulations can effectively reflect the mechanical behaviors of the bilayer interface. Herein, molecular dynamics simulations together with Bell's model are employed to evaluate the effect of sodium chloride solution on the adhesion at interface between epoxy and silica. It is shown that sodium chloride solution weakens the adhesion significantly. This finding indicates that the bond deterioration at epoxy-concrete interface is critical in the presence of salt solution, which must be considered in the engineering design strategy for offshore and marine structures.
      Graphical abstract image

      PubDate: 2017-09-02T07:34:21Z
       
  • Micro-mechanical evaluation of SiC-SiC composite interphase properties and
           debond mechanisms
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): J. Kabel, Y. Yang, M. Balooch, C. Howard, T. Koyanagi, K.A. Terrani, Y. Katoh, P. Hosemann
      SiC-SiC composites exhibit exceptional high temperature strength and oxidation properties making them an advantageous choice for accident tolerant nuclear fuel cladding. In the present work, small scale mechanical testing along with AFM and TEM analysis were employed to evaluate PyC interphase properties that play a key role in the overall mechanical behavior of the composite. The Mohr-Coulomb formulation allowed for the extraction of the internal friction coefficient and debonding shear strength as a function of the PyC layer thickness, an additional parameter. These results have led to re-evaluation of the Mohr-Coulomb failure criterion and adjustment via a new phenomenological equation.

      PubDate: 2017-09-02T07:34:21Z
       
  • Alumina-graphene hybrid filled epoxy composite: Quantitative validation
           and enhanced thermal conductivity
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): M. Wasim Akhtar, Yun Seon Lee, Dong Jin Yoo, Jong Seok Kim
      Alumina-graphene hybrid fillers (Gr-Al2O3) were synthesized and added to the epoxy matrix to improve thermal properties of the epoxy composite. The alumina particles were surface modified with silane coupling agents like 3-Aminopropyl triethoxysilane (A-Al2O3). 3-Glycidyloxypropyl trimethoxysilane (GPTMS) was used for the surface modification of the graphene (G-Graphene). These modifications on the filler surface help to develop the interface between the fillers and the epoxy matrix, which might help to form the effective 3D thermal conductive networks. The generation of these 3D networks facilitated in reducing the Kapitza resistance and increases the transportation of phonons in the matrix, Furthermore; it improved the integral procedure decomposition temperature (IPDT) and activation energy (Ea) of the composite. Alumina-graphene hybrid filled epoxy composite (hAG-Epoxy) with 50 vol% of hybrid filler (Gr-Al2O3) expressed the considerable improvement in in-plane thermal conductivity and IPDT by ∼8.4 and ∼3.1 folds in comparison with neat epoxy, respectively. The significant improvement in thermal conductivity was related to the generation of effective 3D thermal conductive pathways formed by 2D graphene and 1D alumina in the composite.
      Graphical abstract image

      PubDate: 2017-09-02T07:34:21Z
       
  • An interface-dependent model of plateau fracture toughness in
           multidirectional CFRP laminates under mode I loading
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Libin Zhao, Yana Wang, Jianyu Zhang, Yu Gong, Zizi Lu, Ning Hu, Jifeng Xu
      Obvious R-curve behavior exists in multidirectional carbon fiber reinforced polymers (CFRP) laminates under mode I loading, in which the plateau fracture toughness represents the steady-state delamination growth behavior. By decomposing the fracture toughness into the fracture work for pure delamination at the interface and that for the intra-ply damage of adjacent layers, a mechanism-based correlation between the plateau value of interface mode I fracture toughness in multidirectional laminates and the interface angle and/or the two angles of the fiber orientations of the two layers surrounding the crack tip was developed, which is an explicitly interface-dependent formula. Static tests were performed on six types of DCB specimen with different interfaces. The analytical calculations agreed well with the experimental data, verifying the proposed correlation. The intra-ply damage and fiber bridging during delamination along different interfaces were evaluated, which provides a justification for the proposed model.

      PubDate: 2017-09-02T07:34:21Z
       
  • Analytical analysis of dynamic stress distribution of fiber reinforced
           polymer rod based on realistic boundary shear stress
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Wen Chen, Jianzhong Hao, Ming Tang
      A closed-form analytical solution of the dynamic stress distribution of the fiber reinforced polymer (FRP) rod is presented in this paper. It is derived based on a trilinear model from a boundary shear stress of the FRP rod. The dynamic stress distribution of the FRP rod during the pull-out process can be modelled by this analytical solution, which is correlated against experimental data. Especially, the stress distributions of the rod at six evolution points are studied. This analytical solution offers a new approach for predicting the ultimate load bearing capacity of the FRP rod.

      PubDate: 2017-09-02T07:34:21Z
       
  • Dynamic modeling and analysis of a rotating flexible beam with smart ACLD
           treatment
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Liang Li, Dingguo Zhang, Yongbin Guo
      Dynamics of a rotating flexible beam with fully covered active constrained lamped damping (ACLD) treatment is investigated. The ACLD beam consists of three sub-layer beams: a piezo-constraining layer, a visco-elastic layer, and a base beam layer. By using the method of assumed modes to describe the deformations of the three sub-layer beams, with the longitudinal shrinking caused by transverse deformation included and all the high-order terms retained, the high-order approximate coupling (HOAC) dynamic equations of a hub-ACLD beam system are derived. The dynamic stiffening effect is considered in this new dynamic model and the model can be used to study the dynamics of a hub-ACLD system undergoing large overall rotating motions. An active/passive hybrid vibration control strategy is adopted to control the vibration of the rotating beam. Simulation results indicate that the proposed method has better parametric adaptability and numerical stability than the other available in the literature. Performances of the system controlled by ACLD technology are superior to those controlled by pure active control technology. By solving the characteristic complex eigenvalue problems of the system numerically, vibration frequencies and damping ratios of the system are obtained and verified. The results of this work can be helpful to the design of smart composite structures for vibration suppression and control in rotating rigid-flexible coupling structures such as robotic arms.

      PubDate: 2017-09-02T07:34:21Z
       
  • Design for structural vibration suppression in laminate acoustic
           metamaterials
    • Abstract: Publication date: 15 December 2017
      Source:Composites Part B: Engineering, Volume 131
      Author(s): Z.C. He, X. Xiao, Eric Li
      This paper investigates the stopband of laminate acoustic metamaterials, which is composed of carbon-fiber-reinforced polymer (CFRP) and a periodic array of mass-spring-damper subsystems integrated with the laminates to act as vibration absorbers. Based on the mathematical model derived in this work, a wide stopband is observed by dispersion analysis. The frequency response analysis is performed to confirm its stopband behavior for a finite laminate acoustic metamaterial. Due to the superior strength to weight ratio of CFRP, the laminate acoustic metamaterials are able to have a much wider stopband than the conventional metamaterial plates proposed in recent years. In addition, the effects of the relevant parameters on the stopband of laminate acoustic metamaterial are discussed in this work. The excellent performance of laminate acoustic metamaterials has been applied to design the vehicle door, and the vibration of the vehicle door is suppressed significantly.

      PubDate: 2017-09-02T07:34:21Z
       
 
 
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