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Characterization of 3D fabric permeability with skew terms
Dergi Makalesi

Dergi Makalesi
Kaynak :
DSpace Makaleler
Dergi:
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Yayıncı:
ELSEVIER SCI LTDTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Yazar(lar) :
Minyoung Yun , Hatice Sas , Pavel Simacek , Suresh G. Advani
Konu :
Resin flow, Liquid composite molding, Permeability, Preform
Yıl :
2017
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Yayıncı Web Sitesi
 Piri Tam Metin Bulucu
Kaydet Alıntıla
Flow simulations can predict resin flow behavior and void formation locations in a preform. One important parameter for simulation is the preform permeability. For thick parts with distribution media on the surface, resin flow is three dimensional and through the thickness permeability is required for simulation. If the fabric is a 3D preform or unbalanced, the through the thickness (Kzz) and two skew components (Kxz and Kyz) must be characterized. The skew terms influence the flow behavior and hence the void formation. In this study, we present a measurement station that provides all six independent components of the permeability tensor from one experiment. The methodology uses the location data of the flow front with time and then couples it to an optimization algorithm and our flow simulation tool, LIMS (Liquid Injection Molding Simulation). The process is automated and experimental results are superimposed on the simulation results to confirm fidelity of the values determined. (C) 2017 Elsevier Ltd. All rights reserved.
DOI : 10.1016/j.compositesa.2016.12.030
Anahtar Kelimeler : Resin flow, Liquid composite molding, Permeability, Preform, article
Cilt: Volume 97 Page 51-59
ISSN: 1359-835X
Sınıflandırma :
2
High temperature and fire behaviour of continuous glass fibre/polypropylene laminates
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
A.G. Gibson , M.E. Otheguy Torres , T.N.A. Browne , S. Feih , A.P. Mouritz
Yıl :
2010
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper reports elevated temperature mechanical property measurements on woven glass fibre/polypropylene composites. Tensile and compressive stress rupture measurements were made on 12 mm thick laminate exposed to 50 kW m−2 heat flux. Behaviour was qualitatively similar to that of thermosetting laminates, but compressive behaviour was significantly inferior, due to a poorer resin–matrix bond, and to the loss of compressive properties at temperatures above the melting point. COM-FIRE, a finite difference implementation of the Henderson Equation, was able to model the thermal and residual resin profiles in the laminate during fire exposure. The thermal predictions were used, in conjunction with the measured mechanical property data, to model changes in elastic properties and stress rupture behaviour in fire. Because of the non-linearity of the tensile stress–strain curves, a 3-parameter model was needed to describe behaviour. In contrast the compressive response could be modelled by a simpler 2-parameter or saw-tooth model.
DOI : 10.1016/j.compositesa.2010.05.004
Anahtar Kelimeler : A. Thermoplastic resin, A. Glass fibres, B. High temperature properties, D. Mechanical testing
ISSN: 1359-835X
Sayı: 9
Cilt: 41
Sayfa: 1219-1231
Sınıflandırma :
3
High strain rate compression of epoxy based nanocomposites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Yan Tian , Hui Zhang , Jun Zhao , Tao Li , Bi-Xiong Bie , Sheng-Nian Luo , Zhong Zhang
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This work aimed to investigate the strain-rate effect (0.001–3000 s−1) on compressive properties of the highly cross-linked epoxy and the epoxy sample filled with 10 wt% sol-gel-formed silica nanoparticles. As the strain rate increased, the compressive modulus and transition strength of both samples went up distinctly, the strain at break and ultimate strength decreased more or less, while the strain energy at fracture nearly did not change. Adding the sol-gel-formed silica nanoparticles can improve effectively the compressive modulus, transition strength as well as strain energy at fracture of the epoxy polymer owing to their homogeneous dispersion in epoxy matrix.
DOI : 10.1016/j.compositesa.2016.06.008
Anahtar Kelimeler : A. Nanoparticles, A. Nanocomposites, A. Thermosetting resin, Split Hopkinson pressure bar (SHPB)
ISSN: 1359-835X
Cilt: 90
Sayfa: 62-70
Sınıflandırma :
4
Fracture toughness and electrical conductivity of epoxy composites filled with carbon nanotubes and spherical particles
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Long-Cheng Tang , Yan-Jun Wan , Ke Peng , Yong-Bing Pei , Lian-Bin Wu , Li-Min Chen , Li-Jin Shu , Jian-Xiong Jiang , Guo-Qiao Lai
Yıl :
2013
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The attainment of both high toughness and superior electrical conductivity of epoxy composites is a crucial requirement in some engineering applications. Herein, we developed a strategy to improve these performances of epoxy by combining the multi-wall carbon nanotubes (MWCNTs) and spherical particles. Two different types of spherical particles i.e. soft submicron-rubber and rigid nano-silica particles were chosen to modify the epoxy/MWCNT composites. Compared with the binary composites with single-phase particles, the ternary composites with MWCNTs and spherical particles offer a good balance in glass transition temperature, electrical conductivity, stiffness and strength, as well as fracture toughness, exhibiting capacities in tailoring the electrical and mechanical properties of epoxy composites. Based on the fracture surface analysis, the complicated interactions between multiscale particles and the relative toughening mechanisms were evaluated to explain the enhancement in fracture toughness of the ternary composites.
DOI : 10.1016/j.compositesa.2012.09.012
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), A. Nano-structures, B. Fracture toughness, B. Electrical properties
ISSN: 1359-835X
Cilt: 45
Sayfa: 95-101
Sınıflandırma :
5
Effects of inter-fiber spacing on fiber-matrix debond crack growth in unidirectional composites under transverse loading
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Linqi Zhuang , Andrejs Pupurs , Janis Varna , Ramesh Talreja , Zoubir Ayadi
Yıl :
2018
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The energy release rate (ERR) of a fiber–matrix debond crack in a unidirectional composite subjected to transverse tension is studied numerically. The focus of the study is the effect of the proximity of the neighboring fibers on the ERR. For this, a hexagonal pattern of fibers in the composite cross-section is considered. Assuming one fiber to be debonded at certain initial debond arc-length, the effect of the closeness of the surrounding six fibers on the ERR of the crack is studied with the inter-fiber distance as a parameter. Using an embedded cell consisting of discrete fibers in a matrix surrounded by the homogenized composite, a finite element model and the virtual crack closure technique are used to calculate the ERR. Results show that the presence of the local fiber cluster accelerates the crack growth up to a certain initial crack angle, beyond which the opposite effect occurs. It is also found that the residual stress due to thermal cooldown reduces the ERR. However, the thermal cooldown is found to enhance the debond growth in plies within a cross-ply laminate.
DOI : 10.1016/j.compositesa.2018.03.031
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), B. Debonding, C. Finite element analysis (FEA)
ISSN: 1359-835X
Cilt: 109
Sayfa: 463-471
Sınıflandırma :
6
Experimental and numerical study of reinforced concrete specimens strengthened with composite plates
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Mickael Muller , Evelyne Toussaint , Jean-François Destrebecq , Michel Grédiac
Yıl :
2004
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The present paper deals with the refined analysis of reinforced concrete specimens strengthened with composite plates and subjected to tension tests. A particular attention is paid to the characterization of cracks that develop in the concrete when tensile tests are carried out. A non-contact optical method based on image correlation is used to determine the displacement field onto the surface of the specimens during the tests. Both unstrengthened and strengthened specimens are tested in purely axial tension. The latter ones are first precracked, then repaired with composite plates bonded onto the concrete. The influence of the composite plates is studied in terms of distribution and width of cracks, especially in the vicinity of the composite. A model for the prediction of crack width in a repaired specimen is proposed. This model is validated by experiments and 3D finite element simulations.
DOI : 10.1016/j.compositesa.2004.01.009
Anahtar Kelimeler : A. Laminates, B. Anisotropy, C. Laminate mechanics, Optimization
ISSN: 1359-835X
Sayı: 7-8
Cilt: 35
Sayfa: 885-893
Sınıflandırma :
7
Stiffness and failure behaviour of folded sandwich cores under combined transverse shear and compression
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
M. Kintscher , L. Kärger , A. Wetzel , D. Hartung
Yıl :
2007
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
For efficiently simulating the failure behaviour of sandwich structures made of stiff face sheets and a light-weight core, macroscopic material stiffness and strength values are essential. The investigated folded cores are made from Nomex paper coated with epoxy resin. Due to their channel-like structure, folded cores are air ventilated, which can help to reduce the danger of deterioration, which is a big advancement for applications in the aerospace industry. Folded core structures were tested under combined transverse compression and shear in order to get the stiffness values and the failure criterion under a multi-axial stress state. For this purpose a new test device was developed, which allows a simultaneous application of shear and compression loads. The test results are presented and discussed using a nonlinear description of the stiffness and failure behaviour of the folded core structure. Additionally, the results are compared to the stiffness and the failure behaviour of honeycomb cores.
DOI : 10.1016/j.compositesa.2006.11.008
Anahtar Kelimeler : Sandwich core, B. Transverse cracking, C. Damage mechanics, D. Mechanical testing
ISSN: 1359-835X
Sayı: 5
Cilt: 38
Sayfa: 1288-1295
Sınıflandırma :
8
A parametric study of mechanical and flammability properties of biochar reinforced polypropylene composites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Shafaq Ikram , Oisik Das , Debes Bhattacharyya
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A parametric study of biochar/wood/polypropylene (PP) composites has been conducted in order to evaluate the significant material factors that could affect the mechanical and flammability properties of the resulting composites. The presence/absence of coupling agent and wood, particle size of biochar and melt flow index of PP are the four factors investigated employing the Taguchi’s design of experiment technique. Eight composite samples were manufactured by extrusion and injection moulding to be tested for their mechanical and flammability properties. Experimental results indicate that the presence of coupling agent and wood (in conjunction with biochar) play a critical role in achieving improved tensile and flexural properties. It is interesting to note that in terms of flammability properties, there does not appear to be much difference in the values of peak heat release rate amongst the composites, thus allowing the selection of the composition that would essentially be best suited for mechanical properties.
DOI : 10.1016/j.compositesa.2016.10.010
Anahtar Kelimeler : A. Biocomposite, B. Mechanical properties, B. Thermal properties, C. Statistical properties/methods
ISSN: 1359-835X
Cilt: 91
Sayfa: 177-188
Sınıflandırma :
9
Polyamide 46/multi-walled carbon nanotube nanocomposites with enhanced thermal, electrical, and mechanical properties
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Fang-Chyou Chiu , Gow-Feng Kao
Yıl :
2012
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Polyamide 46 (PA 46)/modified multi-walled carbon nanotube (m-MWNT) nanocomposites were prepared using a solution mixing technique. The efficient modification of the MWNTs was confirmed by Raman spectrometry with a 0.52 intensity ratio of the D–G bands. Scanning electron microscopy images demonstrated sufficient adhesion between the m-MWNTs and PA 46. Differential scanning calorimetry results illustrated that the m-MWNTs facilitated the nucleation of PA 46 (up to ca. 11 °C rise), leading to smaller PA 46 crystallites. Avrami analysis showed a decrease in the dimension of PA 46 crystal growth in the composites because of a nanoconfined/constrained environment formation. The equilibrium melting temperature ( Tm°) of PA 46 increased in the composites, with an increase of 5.8 °C at 3 wt.% m-MWNT loading. The hardness increased to 34% for the composites compared with neat PA 46. An electrical percolation threshold between 2 wt.% and 3 wt.% m-MWNT loading was identified.
DOI : 10.1016/j.compositesa.2011.10.010
Anahtar Kelimeler : A. Nano-structures, A. Polymeru2013matrix composites (PMCs), B. Mechanical properties, B. Thermal properties
ISSN: 1359-835X
Sayı: 1
Cilt: 43
Sayfa: 208-218
Sınıflandırma :
10
Cellulose nanofiber reinforced poly(vinyl alcohol) composite film with high visible light transmittance
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Chunyi Tang , Haiqing Liu
Yıl :
2008
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
In this paper, we presented the fabrication and characterization of poly(vinyl alcohol) (PVA) composite film reinforced with high volume of electrospun cellulose nanofibrous mat (CNM). Its visible light transmittance and mechanical properties were examined in relation to fiber content in the composite. Optimal CNM content in the composite was found to be 40 wt% in terms of its overall properties. This composite film exhibited visible light transmittance of 75%, and its mechanical strength and Young’s modulus were increased by 50% and 600%, respectively, as compared to neat PVA film.
DOI : 10.1016/j.compositesa.2008.07.005
Anahtar Kelimeler : A: Nano-structures, A. Polymer fiber, B: Mechanical properties, E: Casting
ISSN: 1359-835X
Sayı: 10
Cilt: 39
Sayfa: 1638-1643
Sınıflandırma :
11
Exploring the potential of waste leaf sheath date palm fibres for composite reinforcement through a structural and mechanical analysis
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Alain Bourmaud , Hom Dhakal , Anouck Habrant , Justine Padovani , David Siniscalco , Michael H. Ramage , Johnny Beaugrand , Darshil U. Shah
Yıl :
2017
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This work proposes a multi-scale study of the properties of leaf sheath date palm fibres currently considered as agricultural waste. Firstly, by using optical and electronic microscopy, two main types of bundles were identified which have profoundly different structures. Biochemical analysis and X-ray diffraction (XRD) revealed a low degree of crystallinity but a significant lignin content of about 17% giving the bundles a very cohesive structure as well as a good thermal stability in addition to a singular behaviour in dynamic vapour sorption. An average cell wall stiffness in the order of 16 GPa was highlighted by Atomic Force Microscopy in mechanical mode but tensile tests on bundles have revealed low stiffness and strength but a high elongation. These results combined with the cellular structure of these bundles, provides the potential of these wastes as cost effective and environmentally friendly composite reinforcements for high energy absorption and improved acoustics functions.
DOI : 10.1016/j.compositesa.2017.10.017
Anahtar Kelimeler : Natural fibres, Chemical analysis, Microstructural analysis, Mechanical properties
ISSN: 1359-835X
Cilt: 103
Sayfa: 292-303
Sınıflandırma :
12
In situ neutron diffraction observations of Ti-TiB composites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Harshpreet Singh , Muhammad Hayat , Zhen He , Vanessa K. Peterson , Raj Das , Peng Cao
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper characterizes and evaluates TiB/Ti composites during thermal treatment using in situ neutron diffraction. The composites were developed using a conventional press and sinter technique. Pure titanium (Ti) was chosen as the matrix, and different concentrations of TiB2 were used as the boron source for the in situ development of the TiB phase. The conversion of phases from TiB2 (2–10 wt.%) to TiB during heating and cooling in the Ti matrix was studied for the first time using in situ neutron diffraction. No metastable phases were observed during heat-treating of the samples. Microstructural evolution and tensile properties of these composites were also evaluated with the highest tensile strength recorded of 684.95 MPa for the sample containing 5 wt.% TiB2.
DOI : 10.1016/j.compositesa.2019.105501
Anahtar Kelimeler : A. Metal matrix composites (MMCs), B. Mechanical properties, B. Microstructures, D. Neutron diffraction
ISSN: 1359-835X
Cilt: 124
Sayfa: 105501
Sınıflandırma :
13
Interfacial adhesion between carbon fibers and nylon 6: Effect of fiber surface chemistry and grafting of nano-SiO2
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Tao Zhang , Yue Xu , Hongfu Li , Boming Zhang
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
In this study, the effect of carbon fiber (CF) surface chemistry and grafting of nano-SiO2 on CF surface with respect to the interfacial adhesion of CF-reinforced nylon 6 composites was investigated. CFs were oxidized and reacted with poly(oxypropylene) diamines to modify the surface chemistry. The oxidized CFs were modified with 3-aminopropyltriethoxysilane and then grafted with SiO2 nanoparticles. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microcopy (SEM), and atomic force microscopy (AFM) were used to characterize the chemistry and topographies of the CF surface. The transverse fiber bundle strength of CF oxidized and grafted nano-SiO2 increased to 31.92 MPa and 39.35 MPa, respectively, from 12.57 MPa for untreated CF. The results indicated that the reaction between the carboxyl group and nylon 6 led to chemical bonding at the interface and it meanwhile was strengthened and toughened by uniformly distributed SiO2 nanoparticles on the CF surface.
DOI : 10.1016/j.compositesa.2019.03.029
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), B. Carbon fibers, C. Thermoplastic resin, D. Interface/interphase
ISSN: 1359-835X
Cilt: 121
Sayfa: 157-168
Sınıflandırma :
14
Towards a better understanding of wood cell wall characterisation with contact resonance atomic force microscopy
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
O. Arnould , R. Arinero
Yıl :
2015
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Nowadays, the multi-scale modelling of wood has a great need for measurements of structural, chemical and mechanical properties at the lowest level. In this paper, the viscoelastic properties in the layers of a wood cell wall are investigated using the contact resonance mode of an atomic force microscope (CR-AFM). A detailed experimental protocol suitable for obtaining reproducible and quantifiable data is proposed. It is based on three main steps: sample preparation to obtain a good surface state, calibration of the contact modulus using reference samples, and image processing to produce the viscoelastic images. This protocol is applied on chestnut tension wood. The obtained topography and semi-quantitative viscoelastic maps are discussed with respect to the cell wall structure, sample preparation effects, and AFM measurement specificity compared with nanoindentation.
DOI : 10.1016/j.compositesa.2015.03.026
Anahtar Kelimeler : A. Wood, B. Mechanical properties, A. Fibres, D. Mechanical testing
ISSN: 1359-835X
Cilt: 74
Sayfa: 69-76
Sınıflandırma :
15
Transient gas flow technique for inspection of fiber preforms in resin transfer molding
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Sun K. Kim , Isaac M. Daniel
Yıl :
2005
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A transient gas flow method was developed to determine the quality of fibrous preforms in resin transfer molding (RTM) prior to resin injection. The method aims at detecting defects resulting from preform misplacement in the mold, accidental inclusions, preform density variations, race tracking, shearing, etc. Unlike the previously developed method based on steady-state gas flow, the new method allows for the acquisition of continuous time-varying pressure data from multiple ports during a single test. The validity of the method was confirmed by one-dimensional flow experiments.
DOI : 10.1016/j.compositesa.2005.03.002
Anahtar Kelimeler : A. Preform, B. Defects, D. Process monitoring, E. Resin transfer moulding (RTM)
ISSN: 1359-835X
Sayı: 12
Cilt: 36
Sayfa: 1694-1699
Sınıflandırma :
16
An experimental and numerical investigation into damage mechanisms in tapered laminates under tensile loading
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Bing Zhang , Luiz F. Kawashita , Mike I. Jones , James K. Lander , Stephen R. Hallett
Yıl :
2020
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Through-thickness thickness reductions in laminated composites are essential for weight and aerodynamic efficiency, but they can also be the site of damage initiation. Tensile failure mechanisms of modestly tapered laminates, loaded via gripping their thick and thin ends, and a severely tapered laminate, loaded by contact at its tapered section, were investigated via experiments and high-fidelity finite element modelling. The primary failure mode is by delamination, initiated from a terminated ply in the tapered region, which is quite sensitive to a small delamination defect at a ply drop location. Experimental measurements and FE predictions correlate very well in all cases for both location and load. In the severely tapered case, the contact stress influences the delamination and so a fibre failure criterion also needs to be considered, including both the fibre direction tensile stress and its interaction with through-thickness direct and shear stresses imposed by the contact.
DOI : 10.1016/j.compositesa.2020.105862
Anahtar Kelimeler : A. Laminates, B. Delamination, C. Cohesive interface modelling, Ply drops
ISSN: 1359-835X
Cilt: 133
Sayfa: 105862
Sınıflandırma :
17
4D printing of electroactive shape-changing composite structures and their programmable behaviors
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Xinyu Dong , Fenghua Zhang , Linlin Wang , Yanju Liu , Jinsong Leng
Yıl :
2022
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
4D printing is an advanced manufacturing technology that combines the convenience of additive manufacturing and uses stimuli-responsive materials, which has great application potentials in the field of smart structures. Using electroactive shape memory polymer composites (SMPCs), smart devices with remote control capabilities without a heat source can be prepared by 4D printing. In this work, a variety of 4D printed structures based on PLA/CNT composites were fabricated by FDM. Electroactive SMPC filaments with different CNT contents were prepared, and their electrical, thermal, and shape-memory properties were investigated. Moreover, a series of 2D and 3D printed complex structures were designed and manufactured to realize their shape recovery behavior under the electrical field. The relationship between the electroactive shape-memory performance of 4D printed structures, structural design, and printing parameters was obtained. This work could provide a new feasible way for the design and manufacturing of electroactive devices in the future.
DOI : 10.1016/j.compositesa.2022.106925
Anahtar Kelimeler : A. Smart materials, A. Multifunctional composites, E. 3-D Printing
ISSN: 1359-835X
Cilt: 157
Sayfa: 106925
18
A simple mechanistic model to predict the macroscopic response of fibreglass–aluminium laminates under low-velocity impact
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
G. Caprino , V. Lopresto , P. Iaccarino
Yıl :
2007
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Low-velocity impact tests were carried out on fibreglass–aluminium laminates made of 2024 T3 sheets and S2-glass/epoxy prepreg layers, using an instrumented falling weight machine. In the tests, the impactor mass was held constant, whereas the energy was varied by adjusting the drop height. The load–displacement curves obtained were highly non-linear, with the specimen stiffness rapidly increasing with increasing the displacement. From the analysis of the data, the material response was unaffected by the actual speed adopted. Simple second-order polynomials, together with additional hypotheses supported by the results generated, were used to represent the load variation as a function of displacement during both the loading and the rebound phase. The resulting model, aiming to predict the contact history, consisted of three parameters, which could be determined by a minimum of experimental tests. From the model, the fundamental impact features, such as the overall force–time curve, dissipated energy, and contact duration, were effectively calculated. The damage progression with increasing the impact energy was assessed by ultrasonic C-scan and destructive analysis. Even when considerable failures were detected in the material, no clear sign of their occurrence was yielded by the fundamental impact parameters usually provided by an instrumented impact test, i.e. the force–time and force–displacement curves, the residual displacement, and the contact time. Only the extent of the damage area, plotted against the energy, underwent a sudden change in slope when a major damage took place.
DOI : 10.1016/j.compositesa.2006.04.005
Anahtar Kelimeler : A. Hybrid, A. Layered structures, B. Impact behaviour, C. Analytical modelling
ISSN: 1359-835X
Sayı: 2
Cilt: 38
Sayfa: 290-300
Sınıflandırma :
19
Towards the design of a new standard for composite stiffness identification
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
X. Gu , F. Pierron
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper presents a step towards the design of a novel test for simultaneous identification of all the stiffness components of orthotropic composite materials. A simulator was adopted to numerically simulate the whole identification process. Synthetic images were generated and then processed by Digital Image Correlation (DIC) to calculate the strain fields. The Virtual Fields Method (VFM) was used to identify the material stiffness parameters and error functions were finally defined to evaluate the identification error. Two steps of optimization were applied to obtain the best design variables of different specimens and the optimal DIC processing parameters. Four types of test configuration were simulated including short off-axis tensile test, short off-axis open-hole tensile test, off-axis Brazilian disc and off-axis unnotched Iosipescu test and the most promising configuration was identified.
DOI : 10.1016/j.compositesa.2016.03.026
Anahtar Kelimeler : Digital image correlation, Virtual fields method, Simulated experiments, Test optimization
ISSN: 1359-835X
Cilt: 91
Sayfa: 448-460
Sınıflandırma :
20
Facile synthesis of lanthanum hypophosphite and its application in glass-fiber reinforced polyamide 6 as a novel flame retardant
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Gang Tang , Xin Wang , Rui Zhang , Wei Yang , Yuan Hu , Lei Song , Xinglong Gong
Yıl :
2013
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
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Kaydet Alıntıla
This work developed flame retarded glass fiber reinforced polyamide 6 (FR-GFPA) composites with excellent mechanical properties, thermal stability and flame retardancy using a novel flame retardant, lanthanum hypophosphite (LaHP). The flame-retarded properties of FR-GFPA composites were characterized by limiting oxygen index, Underwriters Laboratories 94 testing and cone calorimeter test. FR-GFPA composite with 20 wt% LaHP reached V-0 rating and a high LOI value (27.5 vol%). The mechanical performance analysis showed that both the storage modulus and tensile strength increased and then decreased with the increase of LaHP loading. For FR-GFPA composite with 15 wt% LaHP loading, the storage modulus was 164% higher than that of glass fiber reinforced polyamide 6 (GFPA). Thermogravimetric analysis (TGA) and char residue characterization showed that the addition of LaHP can promote the formation of compact physical char barrier, reduce the mass loss rate and thus improve the flame retardancy of FR-GFPA composites.
DOI : 10.1016/j.compositesa.2013.07.001
Anahtar Kelimeler : A. Glass fibers, A. Polymeru2013matrix composites (PMCs), A. Particle-reinforcement, B. Mechanical properties
ISSN: 1359-835X
Cilt: 54
Sayfa: 1-9
Sınıflandırma :
21
Size effects in hybrid unidirectional polymer composites under longitudinal tension: A micromechanical investigation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Jose M. Guerrero , Joan A. Mayugo , Josep Costa , Albert Turon
Yıl :
2021
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
While fibre hybrid composites result in hybrid effects and improved ductility compared to non-hybrid laminates, it is unclear how material size influences hybrid properties (i.e. the so-called ‘size effect’). This paper addresses this phenomenon in a carbon–carbon hybrid composite by means of micromechanical modelling using a progressive failure model. Results demonstrate that increasing either the length or the cross-section of the virtual Representative Volume Element (RVE) causes an earlier failure, slightly decreases ductility and significantly improves the hybrid effect. In addition, increasing the RVE volume results in a higher maximum cluster size, while the presence of ductility does not alter the magnitude of the size effects. Further, the presence of a larger hybrid effect does not necessarily translate into greater ductility.
DOI : 10.1016/j.compositesa.2020.106186
Anahtar Kelimeler : Size effects, A. Hybrid, C. Computational modelling, C. Micro-mechanics
ISSN: 1359-835X
Cilt: 140
Sayfa: 106186
22
The influence of inter-laminar thermal contact resistance on the cooling of material during laser assisted fiber placement
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Ozan Çelik , S.M. Amin Hosseini , Ismet Baran , Wouter J.B. Grouve , Remko Akkerman , Daniël M.J. Peeters , Julie J.E. Teuwen , Clemens A. Dransfeld
Yıl :
2021
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The effect of thermal contact resistance (TCR) correlated to the degree of intimate contact (DIC) between the incoming tape and the substrate on the temperature history during laser-assisted fiber placement (LAFP) was investigated. A novel experimental methodology was designed to understand the effect with a non-contact method which did not influence the local consolidation quality. To assess the influence of TCR numerically, a three-dimensional optical-thermal model was developed. Experimental results indicated that, for the same tape temperature near the nip point, an increase in the compaction force resulted in a decrease in the temperature at the roller exit and the following cooling phase, in correlation with an increase in the final DIC. Also, the effect of the laser power on the final DIC was less pronounced than the compaction force. In the thermal model, when TCR at the tape-substrate interface was not considered, the temperature predictions underestimated the experimental measurements.
DOI : 10.1016/j.compositesa.2021.106367
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), C. Process modeling, D. Microstructural analysis, E. Automated fiber placement (AFP)
ISSN: 1359-835X
Cilt: 145
Sayfa: 106367
23
Durability of glass fibre reinforced composites experimental methods and results
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
H. Cuypers , J. Wastiels , P. Van Itterbeeck , E. De Bolster , J. Orlowsky , M. Raupach
Yıl :
2006
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Even today a main topic of consideration for glass–fibre reinforced cementitious composites is the durability. Several damage mechanisms occur if glass fibres are inserted in a cementitious mixture. To diminish chemical attack of the fibres by hydroxyl ions, inorganic phosphate cement (IPC) was developed at the ‘Vrije Universiteit Brussel’, providing a non-alkaline environment. Since chemical attack is diminished by application of this non-alkaline matrix, IPC is an ideal reference material to study other damage mechanisms. In this paper typical damage mechanisms, occurring in cementitious composites are studied: both the effects of constant environmental loading (typical accelerated ageing tests) and variable environmental loading are studied. A new method to determine the matrix–fibre bundle efficiency is also introduced.
DOI : 10.1016/j.compositesa.2005.03.027
Anahtar Kelimeler : A. Ceramic-matrix composites (CMCs), B. Environmental degradation, C. Micro-mechanics, D. Mechanical testing
ISSN: 1359-835X
Sayı: 2
Cilt: 37
Sayfa: 207-215
Sınıflandırma :
24
IFC - Editorial Board
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yıl :
2009
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1016/s1359-835x(08)00331-x
ISSN: 1359-835X
Sayı: 2
Cilt: 40
Sayfa: IFC
Sınıflandırma :
25
Wettability, reactivity and stress relaxation of an NiAl(Ti)/Al2O3 composite
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
J.F. Silvain , J.C. Bihr , J. Douin
Yıl :
1998
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Sessile drop experiments, auger electron spectroscopy (AES) and transmission electron microscopy (TEM) analysis have been performed on composites: NiAl or NiAl(Ti) intermetallic matrix reinforced by α-alumina fibres. The role of Ti on the wettability behaviour at the fibre/matrix interface has been emphasized, as well as the reactivity of the fibre and the matrix during processing, and the effect of residual stress induced dislocations in the absence of NiAl and NiAl(Ti) cracks.
DOI : 10.1016/s1359-835x(98)00016-5
ISSN: 1359-835X
Sayı: 9-10
Cilt: 29
Sayfa: 1175-1183
Sınıflandırma :
26
Design of composite structures reinforced curvilinear fibres using FEM
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
A.V. Malakhov , A.N. Polilov
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper describes a method of modelling a curvilinear reinforcement structure, for a composite plate with a hole that allows trajectories of fibres to be adapted to geometric discontinuities (holes, notches, bolts, etc.). For this method, it is assumed that the trajectories of fibres are curvilinear and continuous, as well as located along the trajectories of maximum principal stress. On the basis of these trajectories, the functionally graded material is simulated by means of the finite element method (FEM). Each element of this structure has its own mechanical properties, depending on the fibre direction and a change in the distance between the fibres. It is demonstrated that the maximum value of the stress concentration factor in the fibre direction for the plate with the curvilinear reinforcement structure reduces by 3.2 times in comparison with the same plate with a rectilinear reinforcement structure (orthotropic material).
DOI : 10.1016/j.compositesa.2016.04.005
Anahtar Kelimeler : B. Directional orientation, B. Stress concentrations, C. Computational modelling, C. Finite element analysis (FEA)
ISSN: 1359-835X
Cilt: 87
Sayfa: 23-28
Sınıflandırma :
27
Formation of three-dimensional honeycomb-like nitrogen-doped graphene for use in energy-storage devices
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Dongxu He , Wenjian Wang , Yufeng Fu , Rui Zhao , Weidong Xue , Wencheng Hu
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
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Kaydet Alıntıla
We have developed a one-step method to produce three-dimensional honeycomb-like nitrogen-doped graphene. Interlaminated hybrid composites of phthalocyanine (Pc) and graphene oxide (GO) swell up when hydrogen is released from the layers during the solid-state pyrolysis process, producing the three-dimensional graphene. The unique micro-structural features of the honeycomb-like nitrogen-doped graphene possesses a high surface area of ∼230 m2 g−1 and a substantial content of nitrogen (∼4.03%). The planar-N configuration is found to significantly enhance the electrochemical property, due to the improved electrical conductivity and enhanced capacitance in KOH aqueous electrolyte in reversible Faradic redox reactions. The supercapacitor based on the honeycomb-like nitrogen-doped graphene presented outstanding specific capacitance (175 F·g−1 at 0.5 A·g−1) and a long cycle life of more than 5000 cycles. This work provides an opportunity for the mass production of 3D nitrogen-doped graphene for industrial application.
DOI : 10.1016/j.compositesa.2016.08.032
Anahtar Kelimeler : Honeycomb, Graphene, Phthalocyanine, Capacitance
ISSN: 1359-835X
Cilt: 91
Sayfa: 140-144
Sınıflandırma :
28
Characterization of strain-softening behavior and failure mechanisms of composites under tension and compression
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
N. Zobeiry , R. Vaziri , A. Poursartip
Yıl :
2015
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A methodology is presented to directly measure the damage properties and strain softening response of laminated composites by conducting over-height compact tension (OCT) and compact compression (CC) tests. Through the use of digital image correlation (DIC) technique, and analysis of the measured surface displacement/strain data, the strain-softening response of composites is constructed. This method leads to a direct determination of the Mode I translaminar fracture properties with the assumption that the shear stress is negligible around the damage zone and the crack growth occurs in the symmetric opening mode. Using this methodology, and by correlating the observed failure mechanisms with the strain-softening curves, the interaction of failure mechanisms leading to the final failure and also the distinction between the tensile and compressive failure mechanisms can be studied. The effectiveness of the method in accurate identification of the damage parameters is demonstrated through sectioning and deplying techniques. As a consistency check and further verification of the method, the obtained strain-softening curves are fed into a numerical damage mechanics model and successfully used to simulate the detailed response of the very same OCT and CC specimens from which the strain-softening curves were extracted.
DOI : 10.1016/j.compositesa.2014.09.009
Anahtar Kelimeler : A. Polymeru2013matrix composites (PMCs), B. Fracture, B. Fracture toughness, C. Damage mechanics
ISSN: 1359-835X
Cilt: 68
Sayfa: 29-41
Sınıflandırma :
29
Thermoplastic prepreg with partially polymerized matrix: Material and process development for efficient part manufacturing
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Jung Hwan Shin , Daniel Kim , Timotei Centea , Steven R. Nutt
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Extensive use of thermoplastic composites has been restricted by processing challenges emerging from high melt viscosities. We demonstrate the feasibility of thermoplastic prepreg with partially polymerized poly(methyl methacrylate) (PMMA) matrix and carbon fiber reinforcement. The low viscosity pre-polymer resin allowed part consolidation at low temperature and pressure. The chemical kinetics and rheology of PMMA polymerization were characterized, and an aging study was conducted to assess pre-polymer stability. Prepregs were fabricated using lab-scale methods, and a fabrication map was constructed to determine the optimal extent of polymerization for the prepreg. The prepregs were tested for tack and drape at ambient temperature, and thermoformed for microstructural and chemical analysis. The results show that auto-acceleration drives both the rate of polymerization and viscosity evolution, while refrigeration delays pre-polymer out-time effects. The thermoformed laminates exhibited near-zero porosity. This work establishes material and process development guidelines for reactive thermoplastic prepreg, and highlights potential advantages of the proposed prepreg.
DOI : 10.1016/j.compositesa.2019.01.009
Anahtar Kelimeler : A. Prepreg, A. Thermoplastic resin, D. Thermal analysis, E. Prepreg processing
ISSN: 1359-835X
Cilt: 119
Sayfa: 154-164
Sınıflandırma :
30
Tensile mechanical properties and surface chemical sensitivity of technical fibres from date palm fruit branches (Phoenix dactylifera L.)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Salah Amroune , Abderrezak Bezazi , Ahmed Belaadi , Chenchen Zhu , Fabrizio Scarpa , Sameer Rahatekar , Abdellatif Imad
Yıl :
2015
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The paper describes the manufacturing process and the characterization of the tensile mechanical properties of treated and untreated palm dates long technical fibres. The fibres extracted from Fruit Bunch Branch of Palm Date (FBBPD) have been subjected to alkaline treatment with different NaOH concentrations at room temperature. The experimental results show that the chemical technical fibre treatments provide an increase of the mechanical properties (tensile strength and Young’s modulus) under quasi-static tensile loading. A specific treatment leads a threefold increase of the failure stress. An analysis of stress at failure has been performed over a population of 630 samples using Weibull statistics with two and three-parameters, together with a one-way analysis of variance (ANOVA). FBBPD technical fibres show stiffness and strength performance comparable to the ones of agave Americana L fibres, and higher failure at strength than okra fibres.
DOI : 10.1016/j.compositesa.2014.12.011
Anahtar Kelimeler : A. Wood, B. Mechanical properties, C. Statistical properties/methods, D. Optical microscopy
ISSN: 1359-835X
Cilt: 71
Sayfa: 95-106
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