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Biomass-derived carbon decorated with Ni0.5Co0.5Fe2O4 particles towards excellent microwave absorption performance
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Jin Sun , Juan Chen , Heyi Ge , Hao Sun , Yuxuan Yang , Youzhong Zhang
Yıl :
2022
Composites Part A: Applied Science and Manufacturing
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Searching for high efficiency microwave absorbers is to meet the requirements of elimination of electromagnetic pollution. Herein, the Ni0.5Co0.5Fe2O4 decorated pomelo peel-carbon microwave absorber with uniform particle size was prepared by a facile physical blending method. The skeleton structure formed by biomass carbon (BC) can not only effectively improve the conductive loss, but also extend the propagation path of electromagnetic waves. Besides, the absorber with a great quantity defects and heterogeneous interfaces delivers interfacial polarization and dipole polarization. Also, the Ni0.5Co0.5Fe2O4 particles with good dispersion on BC are beneficial toward dielectric-magnetic combination, resulting in impedance matching. The minimum reflection loss (RL) reaches −41.6 dB and the effective absorption bandwidth (EAB) (RL < −10 dB) is 4.3 GHz with the thickness of 3 mm. This work will promise a good approach to accomplish high performance of microwave absorption.
DOI : 10.1016/j.compositesa.2022.106850
Anahtar Kelimeler : A. Biocomposite, B. Magnetic properties D. Microstructural analysis, Electromagnetic wave absorption
ISSN: 1359-835X
Cilt: 156
Sayfa: 106850
2
Interlaminar fracture toughness of CFRP in Mode I and Mode II determined by Raman spectroscopy
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
H Miyagawa , C Sato , K Ikegami
Yıl :
2001
Composites Part A: Applied Science and Manufacturing
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Fracture toughness of multidirectional Carbon Fiber Reinforced Plastics (CFRP) for Mode I and Mode II was investigated using Double Cantilever Beam (DCB), End Notched Flexure (ENF) specimens and Raman Coating Method. The distribution of strain near the crack tip of CFRP was measured by Raman spectroscopy. Thin films of PbO on the measured surface of the DCB and ENF specimens were deposited by physical vapor deposition as the pretreatment to measure the strain by Raman spectroscopy. The fracture toughness of multidirectional CFRP in both Mode I and Mode II was determined using the results measured by Raman spectroscopy. This result coincided with those measured by conventional methods.
DOI : 10.1016/s1359-835x(00)00104-4
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), B. Fracture toughness, Stress intensity factor
ISSN: 1359-835X
Sayı: 3-4
Cilt: 32
Sayfa: 477-486
Sınıflandırma :
3
Tribological behaviour and wear of carbon nanotubes grafted on carbon fibres
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Claire Guignier , Marie-Ange Bueno , Brigitte Camillieri , Michel Tourlonias , Bernard Durand
Yıl :
2015
Composites Part A: Applied Science and Manufacturing
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Carbon nanotubes (CNTs) grafted on fibres are widely used to reinforce composites in order to improve their mechanical properties. This study concerned the tribological properties of CNTs grafted on carbon fibres by the flame method. The aim of this study was to determine whether CNTs on fibres suffer damage under stress, similar to those applied during composite manufacturing, which can damage composite properties, particularly fibre/matrix adhesion. For this purpose, reciprocating friction tests were performed to examine the resistance of CNTs and highlight a wear mechanism. The results showed that the presence of CNTs increased the coefficient of friction in the first friction cycles and then decreased it to close to the COF of the fibre without CNTs. The wear mechanism showed that after a small number of friction cycles, the CNTs were flattened out and formed a transfer film.
DOI : 10.1016/j.compositesa.2015.01.013
Anahtar Kelimeler : Carbon nanotubes, A. Carbon fibre, B. Wear, B. Surface properties
ISSN: 1359-835X
Cilt: 71
Sayfa: 168-175
Sınıflandırma :
4
Spring-in study of the aileron rib manufactured from advanced thermoplastic composite
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Lalit K. Jain , Meng Hou , Lin Ye , Yiu-Wing Mai
Yıl :
1998
Composites Part A: Applied Science and Manufacturing
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Owing to high processing temperatures, the residual stresses in thermoplastic composites are inevitable. These residual stresses lead to a reduction in the enclosed angle in channel or angle components. This reduction in enclosed angle is referred to as spring-in. In addition, the residual stresses may cause defects such as delamination, fibre waviness, microcracking, etc. This paper investigates the use of a spring-in model to assist with the design of a mould system for an aileron rib. The aileron rib was manufactured from carbon fibre/polyetherimide (CF/PEI) thermoplastic composite material by compression moulding technique. Through microscopic examination and void content measurement, the necessary processing temperature range was determined. The spring-in angle was then predicted based on this processing temperature and an allowance for this was made during tool design. Experimental results showed that there was good agreement between theoretical predictions and the final part angles.
DOI : 10.1016/s1359-835x(97)00085-7
Anahtar Kelimeler : A. carbon fibre, E. thermoplastic resin, A. polymeru2013matrix composites (PMCs), B. residual stress, C. analytical modelling
ISSN: 1359-835X
Sayı: 8
Cilt: 29
Sayfa: 973-979
Sınıflandırma :
5
The influence of nano/micro hybrid structure on the mechanical and self-sensing properties of carbon nanotube-microparticle reinforced epoxy matrix composite
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Weikang Li , Delong He , Jinbo Bai
Yıl :
2013
Composites Part A: Applied Science and Manufacturing
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Nano/micrometer hybrids are prepared by chemical vapor deposition growth of carbon nanotubes (CNTs) on SiC, Al2O3 and graphene nanoplatelet (GNP). The mechanical and self-sensing behaviors of the hybrids reinforced epoxy composites are found to be highly dependent on CNT aspect ratio (AR), organization and substrates. The CNT–GNP hybrids exhibit the most significant reinforcing effectiveness, among the three hybrids with AR1200. During tensile loading, the in situ electrical resistance of the CNT–GNP/epoxy and the CNT–SiC/epoxy composites gradually increases to a maximum value and then decreases, which is remarkably different from the monotonic increase in the CNT–Al2O3/epoxy composites. However, the CNT–Al2O3 with increased AR ⩾ 2000 endows the similar resistance change as the other two hybrids. Besides, when AR < 3200, the tensile modulus and strength of the CNT–Al2O3/epoxy composites gradually increase with AR. The interrelationship between the hybrid structure and the mechanical and self-sensing behaviors of the composites are analyzed.
DOI : 10.1016/j.compositesa.2013.07.002
Anahtar Kelimeler : A. Polymeru2013matrix composites (PMCs), A. Hybrid, B. Electrical properties, B. Mechanical properties
ISSN: 1359-835X
Cilt: 54
Sayfa: 28-36
Sınıflandırma :
6
A simple chemical approach to regenerating the strength of thermally damaged glass fibre
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
S.T. Bashir , L. Yang , R. Anderson , P.L. Tang , J.J. Liggat , J.L. Thomason
Yıl :
2017
Composites Part A: Applied Science and Manufacturing
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Process-induced strength loss is a major technical barrier to the effective reuse of thermally recycled glass fibres in composite applications. We have developed a novel approach to effectively restore strength in glass fibres through treatment in alkaline solutions. Glass fibres were treated at elevated temperature and experienced significant strength loss found typically after thermal recycling processes. Different alkaline treatments were then applied to the thermally damaged fibres in an attempt to restore strength which had been lost as a result of the heat conditioning procedure. Results indicated that these treatments were able to generate considerable fibre strength recovery. The degree of strength regeneration was found to be highly dependent on reaction conditions, which were investigated and optimised. The positive effect of these simple chemical treatments demonstrated great potential for facilitating the reuse of thermally recycled glass fibres in composite applications.
DOI : 10.1016/j.compositesa.2017.07.023
Anahtar Kelimeler : A. Glass fibres, A. Recycling, B. Strength, E. Surface treatments
ISSN: 1359-835X
Cilt: 102
Sayfa: 76-87
Sınıflandırma :
7
Hygrothermal ageing effects on FRP laminate and structural foam materials
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
J EARL , R SHENOI
Yıl :
2004
Composites Part A: Applied Science and Manufacturing
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A programme of dynamic mechanical thermal analysis (DMTA) tests is presented, which was carried out on FRP laminate and PVC foam materials typical of those employed in the sandwich construction of marine craft. The results are compared for as-manufactured material and material that had been aged by fresh water immersion at 40 and 60 °C, in order to determine the evolution of storage modulus, loss modulus, tan δ and glass transition temperature with increasing length and severity of hygrothermal exposure. It was found that plasticisation induced a progressive reduction in room temperature modulus, but there was also evidence of an antiplasticisation process and postcure caused by the elevated temperature immersion, which was revealed upon drying during the DMTA temperature ramp.
DOI : 10.1016/s1359-835x(04)00121-6
Anahtar Kelimeler : A. Foams, A. Laminates, B. Environmental degradation, D. Thermal analysis
ISSN: 1359-835X
Sayı: 11
Cilt: 35
Sayfa: 1237-1247
Sınıflandırma :
8
A modern account of Iosipescu testing
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Filip Stojcevski , Tim Hilditch , Luke C. Henderson
Yıl :
2018
Composites Part A: Applied Science and Manufacturing
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The Iosipescu or V-notch shear test is a method capable of determining the shear modulus and interfacial shear strength (IFSS) of composites at the fiber-matrix interface. Although it has many advantages relating to its simplicity and the creation of pure shear stress region, it remains significantly underutilized for composite testing in comparison to single fiber fragmentation testing (SFFT) and short beam shear (SBS). Here an update is provided on the current status of Iosipescu testing which highlights developments and advances in modelling, fixture arrangement, testing, and several other remaining concerns relating to implementation.
DOI : 10.1016/j.compositesa.2018.02.011
Anahtar Kelimeler : Iosipescu, V-notch shear, Interfacial shear strength, Composites
ISSN: 1359-835X
Cilt: 107
Sayfa: 545-554
Sınıflandırma :
9
5447589 Method for cutting fabrics, especially composite fabrics
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yıl :
1996
Composites Part A: Applied Science and Manufacturing
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Kaydet Alıntıla
DOI : 10.1016/1359-835x(96)81186-9
ISSN: 1359-835X
Sayı: 2
Cilt: 27
Sayfa: 157
Sınıflandırma :
10
Improving the mechanical properties of epoxy using multiwalled carbon nanotubes functionalized by a novel plasma treatment
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Zhiqiang Chen , Xiujuan J. Dai , Kevin Magniez , Peter R. Lamb , David Rubin de Celis Leal , Bronwyn L. Fox , Xungai Wang
Yıl :
2013
Composites Part A: Applied Science and Manufacturing
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Kaydet Alıntıla
Achieving both uniform dispersion and good interfacial adhesion have been long-term challenges in optimizing the properties of carbon nanotube reinforced polymer nanocomposites. A novel and effective plasma method, which combines continuous and pulsed plasma modes in a nitrogen and hydrogen gas mixture (15% H2), has been developed to better meet this need. It has yielded high levels of primary amines on the surface of multiwalled carbon nanotubes which improved their dispersion and interfacial bonding with an epoxy resin. By adding just 0.1 wt% of these nanotubes to Bisphenol F epoxy resin, the mechanical properties of the nanocomposites, from nano to macro, were significantly improved. Nanoindentation tests showed that the hardness and elastic modulus increased by 40% and 19%, respectively, using the functionalized nanotubes. Macro-mechanical properties from thermo-mechanical and flexural analysis were also enhanced, with a nearly 40% improvement in toughness.
DOI : 10.1016/j.compositesa.2012.09.005
Anahtar Kelimeler : A. Particle-reinforcement, B. Mechanical properties, D. Surface analysis, E. Surface treatments
ISSN: 1359-835X
Cilt: 45
Sayfa: 145-152
Sınıflandırma :
11
Enhanced dielectric constant of PVDF-based nanocomposites with one-dimensional core-shell polypyrrole/sepiolite nanofibers
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Shaonan Chen , Sheng Chen , Rui Qiao , Haoran Xu , Zijin Liu , Hang Luo , Dou Zhang
Yıl :
2021
Composites Part A: Applied Science and Manufacturing
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Kaydet Alıntıla
In this paper, the natural sepiolite nanofibers (Sep) were selected to be as the dispersion supporter of conductive polymer polypyrrole (PPy) owing to low cost, natural nanowires and well dispersibility in the PVDF matrix. The one-dimensional core-shell polypyrrole/sepiolite ([email protected]) nanofibers were synthesized by in-situ polymerization and subsequently introduced into the PVDF matrix by the solution blending method. The experimental results demonstrated that PPy was uniformly coated on the Sep surface. The [email protected] nanofibers could disperse in PVDF matrix well and produce the effect of heterogeneous nucleation on PVDF crystallization. With the increasing content of [email protected] from 1 wt% to 5 wt%, the dielectric constant of PVDF-based nanocomposites improved from 12 to 40 at 100 Hz because of the hierarchical interfacial polarization originating from the PPy/Sep interface and PPy/PVDF interface and microcapacitor effect. Meanwhile, a low dielectric loss was observed in the nanocomposites.
DOI : 10.1016/j.compositesa.2021.106384
Anahtar Kelimeler : Polymer-matrix composites, Electrical properties, Nanofibers, Sepiolite
ISSN: 1359-835X
Cilt: 145
Sayfa: 106384
12
Modeling of resin transfer molding of composite materials with oriented unidirectional plies
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Douglas S Cairns , Dell R Humbert , John F Mandell
Yıl :
1999
Composites Part A: Applied Science and Manufacturing
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One of the limiting factors in the application of composites to primary structural applications has been the relatively high cost of converting basic material forms to structural configurations. One potential manufacturing method is Resin Transfer Molding (RTM). In RTM, resin is injected into a fibrous preform. In this study, the processing parameters are defined and investigated analytically and experimentally. A basic model is proposed that incorporates Darcy's law in fibrous bundle regions and channel flow equations between bundles. A model description is provided along with experimental procedures. The model results are compared to experimental data for unidirectional, stitched preforms, and multi-layer configurations with good experimental agreement. It was found that incorporating channel flow is an important feature for properly modeling the RTM process. Pressure profiles, resin velocities, and resin flow fronts are predicted accurately, and are available for manufacturing process development. The same materials were compared to fully stitched preforms. It was found that although the shapes for resin flow are similar between experimental and analytical results, the stitching affects the permeability such that unidirectional ply data do not accurately capture the times for resin flow.
DOI : 10.1016/s1359-835x(98)00081-5
Anahtar Kelimeler : Darcy's law, Resin transfer moulding (RTM)
ISSN: 1359-835X
Sayı: 3
Cilt: 30
Sayfa: 375-383
Sınıflandırma :
13
Defect and damage analysis of advanced discontinuous carbon/epoxy composite materials
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Paolo Feraboli , Tyler Cleveland , Marco Ciccu , Patrick Stickler , Luciano DeOto
Yıl :
2010
Composites Part A: Applied Science and Manufacturing
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Recent composite technology research and development efforts have focused on discontinuous carbon fiber/epoxy molding systems derived from chopped aerospace-grade unidirectional tape prepreg. This study analyzes in detail the meso-structure of this class of materials, which exhibit point-to-point variations associated with the random chip distribution, by means of destructive and non-destructive inspections, in the attempt to identify characteristic traits that can yield insight in its quality and performance. Results show that several types of defects can be encountered within the molded panel, such as macro-voids, fiber kinking and swirling, or resin-rich areas. However, it is found that failure may or may not occur in proximity of these hot spots, independently from their size and location, even for specimens containing the circular hole. Therefore it appears that for this class of materials conventional ultrasonic inspection and defect classification may not be suitable as criteria for part acceptance or rejection.
DOI : 10.1016/j.compositesa.2010.03.002
Anahtar Kelimeler : A. Discontinuous reinforcement, E. Compression moulding, A. Carbon fiber, B. Defects
ISSN: 1359-835X
Sayı: 7
Cilt: 41
Sayfa: 888-901
Sınıflandırma :
14
Lightweight, flexible and superhydrophobic composite nanofiber films inspired by nacre for highly electromagnetic interference shielding
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Ting-Ting Li , Yanting Wang , Hao-Kai Peng , Xuefei Zhang , Bing-Chiuan Shiu , Jia-Horng Lin , Ching-Wen Lou
Yıl :
2020
Composites Part A: Applied Science and Manufacturing
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Inspired by the hierarchical structure of nacre, this study prepared a lightweight, flexible, and superhydrophobic polyacrylonitrile (PAN)@SiO2-Ag composite nanofibrous film with high performance electromagnetic-interference shielding via electrospinning. SiO2 incorporated into PAN electro-spun films provided the adhesion site for Ag nanoparticles (AgNPS). AgNPS were then deposited onto the surface of [email protected]2 electrospinning nanofibers via facile wet electroless deposition, thus endowing the resulting nanofibers with a core–shell structure. After finishing with a PTDT agent, [email protected]2-Ag composite nanofiber films had super hydrophobic property, and their water contact angle reached 156.99°. This scenario also presented high conductivity (approximately 17,788 S/m), average shielding effectiveness (SE), specific SE (SSE), and SSE/t, achieving 82 dB, 367 dB cm3g−1 and 73,478 dB cm2g−1, respectively. This study provides an easy method to prepare bioinspired composite films with high conductive and electromagnetic shielding and high potential applications, such as in wearable and flexible sensors.
DOI : 10.1016/j.compositesa.2019.105685
Anahtar Kelimeler : Super-hydrophobicity, Electromagnetic interference shielding effectiveness, Ag nanoparticles, Core-shell
ISSN: 1359-835X
Cilt: 128
Sayfa: 105685
Sınıflandırma :
15
Monodisperse highly ordered chitosan/cellulose nanocomposite foams
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Sébastien Andrieux , Lilian Medina , Michael Herbst , Lars A. Berglund , Cosima Stubenrauch
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
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In solid foams, most physical properties are determined by the pore size and shape distributions and the organisation of the pores. For this reason, it is important to control the structure of porous materials. We recently tackled this issue with the help of microfluidic-aided foam templating, which allowed us to generate monodisperse and highly ordered chitosan foams. However, the properties of foams also depend on the properties of the pore wall constituents. In case of chitosan-based foams, the foams have poor absolute mechanical properties, simply due to the fact that the solubility of chitosan in water is very low, so that the relative density of the freeze-dried foams becomes very small. Drawing inspiration from the field of nanocomposites, we incorporated cellulose nanofibres into the foamed chitosan solutions, with a view to strengthening the pore walls in the foam and thus the mechanical properties of the final foam. We report here how the cellulose nanofibres affect the structure of both the liquid foam template and the solid foam. The resulting nanocomposite foams have improved mechanical properties, which, however, are not proportional to the amount of cellulose nanofibres in the composites. One reason for this observation is the disturbance of the porous structure of the solid foams by the cellulose nanofibres.
DOI : 10.1016/j.compositesa.2019.105516
Anahtar Kelimeler : Cellulose (A), Foams (A), Nanocomposites (A), Mechanical testing (D)
ISSN: 1359-835X
Cilt: 125
Sayfa: 105516
Sınıflandırma :
16
Analysis of flexible bending behavior of woven preform using non-orthogonal constitutive equation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Woong Ryeol Yu , Michael Zampaloni , Farhang Pourboghrat , Kwansoo Chung , Tae Jin Kang
Yıl :
2005
Composites Part A: Applied Science and Manufacturing
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Kaydet Alıntıla
Previous studies by Yu et al. [Yu WR, Pourboghrat F, Chung K, Zampaloni M, Kang TJ. Non-orthogonal constitutive equation for woven fabric reinforced composites. Composites Part A 2002;33:1095–1105; Yu WR, Zampaloni M, Pourboghrat F, Chung K, Kang TJ. Sheet hydroforming of woven FRT composites: non-orthogonal constitutive equation considering shear stiffness and undulation of woven structure. Compos Struct 2003;61:353–62; Yu WR, Zampaloni M, Pourboghrat F, Liu L, Chen J, Chung K, Kang TJ. Sheet forming analysis of woven FRT composites using picture-frame shear test and non-orthogonal constitutive equation. Int J Mater Prod Tech 2004;21(1/2/3):71–88] have illustrated the validity of the non-orthogonal constitutive relationship for predicting deformation behavior and changes in fiber angle in situations where woven preform was constrained by tools such as the die and blank holders. In the previous studies, the bending rigidity for out-of-plane deformation was assumed to be dependent on the in-plane stiffness; thereby the non-orthogonal constitutive equation being developed was based on the in-plane deformation geometry. The assumption for the bending rigidity was modified in this study by modeling the bending property using an asymmetric axial modulus. The asymmetric axial modulus was considered in order to utilize its ease in calculating bending rigidity from the in-plane stiffness, defining bilinear behavior over the range of tension to compression. The asymmetric factor, the ratio of compression and tensile modulus, for a woven preform was determined through simple cantilever deflection in the warp and weft directions, the validity of which was proven by conducting a cantilever deflection test and simulation in the bias direction. Finite element simulation of three-dimensional bending deformation was performed by using a non-orthogonal constitutive equation and the asymmetric axial modulus. The results show that the draped shape obtained numerically is in good agreement with the experiments in both overall deflected shape and projected contour. A shaping process was also simulated to show the usefulness of the current approach. By including the gravity and contact loading, successful prediction was made but a need was identified that extends linear asymmetric factor into nonlinear form in order to simulate large deformation in bending.
DOI : 10.1016/j.compositesa.2004.10.026
Anahtar Kelimeler : A. Preform, B. Mechanical properties, C. Computational modeling, Asymmetric axial modulus
ISSN: 1359-835X
Sayı: 6
Cilt: 36
Sayfa: 839-850
Sınıflandırma :
17
Arthropod cuticle: a natural composite shell system
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Julian F.V. Vincent
Yıl :
2002
Composites Part A: Applied Science and Manufacturing
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The cuticle of arthropods (jointed-limb animals), and especially of insects is, by biological standards, a relatively simple composite. It is a single external layer of material forming the skeleton and many sense organs. The fibrous phase is crystalline chitin making nanofibrils of about 3 nm diameter, a few hundreds of nanometers long and a modulus probably in excess of 150 GPa. At least two surfaces of the nanofibril can have silk-like protein attached through specific H-bonds; the rest of the protein is globular. The protein matrix stiffens through dehydration controlled by the introduction of hydrophobic phenolics. Crustacea add up to 40% calcium salts. The stiffness of cuticle can range from tens of GPa to 1 kPa. It can be hardened by the addition of Zn or Mn. It can form springs and change its stiffness and plasticity under the control of the animal.
DOI : 10.1016/s1359-835x(02)00167-7
Anahtar Kelimeler : A. Fibres, A. Nano-structures, B. Fibre/matrix bond, B. Mechanical properties
ISSN: 1359-835X
Sayı: 10
Cilt: 33
Sayfa: 1311-1315
Sınıflandırma :
18
Tensile deformation and fracture behaviour of a titanium-alloy metal-matrix composite
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
T.S. Srivatsan , W.O. Soboyejo , R.J. Lederich
Yıl :
1997
Composites Part A: Applied Science and Manufacturing
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In this paper, the microstructure, tensile behaviour and quasi-static fracture characteristics of a Ti-6Al-4V alloy reinforced with discontinuous whiskes of titanium boride, are presented and discussed. Microstructural analysis of the composite revealed a non-uniform dispersion of the whisker reinforcements in the Ti-6Al-4V matrix. The elastic modulus of the composite was better than that of the unreinforced matrix. The ambient-temperature yield strength of the Ti-6Al-4V/TiB composite was higher than the yield strength of the unreinforced matrix. The strength decreased with increase in test temperature. The increased strength of the composite is rationalized in terms of concurrent and mutually interactive influences of mechanisms based on work hardening and the substructure that evolves from the presence of additional dislocations. The intrinsic mechanisms and micromechanisms governing the tensile fracture process are discussed.
DOI : 10.1016/s1359-835x(96)00136-4
Anahtar Kelimeler : metal-matrix composites, discontinuous reinforcement, microstructure, strengthening mechanisms
ISSN: 1359-835X
Sayı: 4
Cilt: 28
Sayfa: 365-376
Sınıflandırma :
19
Erratum to “Tribological and mechanical properties of the composites made of carbon fabrics modified with various methods” Composites Part A 36 (2005) 1601–1607
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Feng-hua Su , Zhao-zhu Zhang , Kun Wang , Wei Jiang , Wei-min Liu
Yıl :
2006
Composites Part A: Applied Science and Manufacturing
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DOI : 10.1016/j.compositesa.2006.06.001
ISSN: 1359-835X
Sayı: 10
Cilt: 37
Sayfa: 1842
Sınıflandırma :
20
Vibration-based delamination detection in curved composite plates
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Zhifang Zhang , Jingwen Pan , Weili Luo , Karthik Ram Ramakrishnan , Hemant Kumar Singh
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
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Delamination is one of common damages in fibre-reinforced composite laminates. It is known to cause changes in the vibration characteristics of the laminates, which allows for the use of vibration-based indicators for assessing structural health conditions and identifying potential risk of catastrophic failures. This paper presents a vibration-based approach to assess delamination in fibre reinforced composite curved plates through frequency shifts as indicative parameters. Two algorithms based on computational intelligence, namely artificial neural network (ANN) and surrogate assisted genetic algorithm (SAGA), were employed as inverse algorithms for predicting the location, size and interface of the delamination. The validation of the two algorithms is realized numerically through finite element (FE) studies conducted using a structured selection of parameters of genetic algorithms, number of frequency shifts and database size. Experimental modal testing was conducted using scanning laser vibrometer on five carbon fibre reinforced polymer (CFRP) curved plates. Among these, one was intact and the other four were manufactured with artificially induced laminations. It was confirmed that the two inverse algorithms were able to reasonably predict delamination parameters in curved composite plates. Among the two, SAGA’s performance was observed to be better. A sensitivity analysis was further conducted by adding artificial noise to the numerical data to simulate measurement errors for investigating the influence of noise on the accuracy of the two algorithms.
DOI : 10.1016/j.compositesa.2019.02.002
Anahtar Kelimeler : Curved plate, Delamination detection, Structural health monitoring, Natural frequency, Surrogate model, Genetic algorithm, Artificial neural network
ISSN: 1359-835X
Cilt: 119
Sayfa: 261-274
Sınıflandırma :
21
Influence of thermoplastic diffusion on morphology gradient and on delamination toughness of RTM-manufactured composites
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Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
P. Van Velthem , W. Ballout , D. Daoust , M. Sclavons , F. Cordenier , E. Henry , D. Dumont , V. Destoop , T. Pardoen , C. Bailly
Yıl :
2015
Composites Part A: Applied Science and Manufacturing
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We explore the influence of the interdiffusion of two thermoplastic tougheners and RTM6 epoxy resin precursors on the resulting morphologies after curing and the consequences on delamination toughness of the corresponding carbon fiber reinforced composites. Two thermoplastics with contrasting Tg and compatibility, i.e. poly(ether sulfone) (PES) and phenoxy are compared. The dramatic improvement of the interlaminar fracture toughness (GIC) found for the phenoxy-RTM6 system as compared to the pure thermoset reference can be ascribed to the broad morphology gradient only observed for that system. By contrast, the PES-RTM6 system is characterized by a steep morphology gradient and a corresponding decrease of as compared to the reference.
DOI : 10.1016/j.compositesa.2015.02.012
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), B. Fracture toughness, B. Microstructures, E. Resin transfer molding (RTM)
ISSN: 1359-835X
Cilt: 72
Sayfa: 175-183
Sınıflandırma :
22
Deformation and damage mechanisms in fibre-reinforced aluminium alloy composites under tension
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
A.S. Chen , R.S. Bushby , V.D. Scott
Yıl :
1997
Composites Part A: Applied Science and Manufacturing
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A well-consolidated composite consisting of aluminium alloy reinforced with continuous alumina-based fibres has been made by liquid metal infiltration and its mechanical behaviour investigated by destructive and non-destructive means. The methods involve monotonic and unload/reload tensile testing, and include acoustic emission and slip-line studies to monitor deformation. The longitudinal composite subjected to tensile stress showed three-stage stress-strain behaviour. Stages I and II were linear and associated with elastic and plastic deformation of the matrix, respectively, whilst stage III was related to fibre damage. With the transverse specimen, the stress-strain curve showed a linear stage I and a progressively decreasing slope in stage II as plastic deformation continued, but no well-defined stage I/II transition: some degree of damage was again associated with fibre breakage. Differences of yield stress in directions parallel and perpendicular to fibres were attributed to residual stress in the matrix produced during manufacture of the composite. Heat treatment increased the yield stress of the composites but the heat-treatment potential of the matrix alloy was not fully realized because of increased brittleness of the age-hardened matrix.
DOI : 10.1016/s1359-835x(96)00134-0
Anahtar Kelimeler : fibres, metal, aluminium alloy composites, deformation
ISSN: 1359-835X
Sayı: 3
Cilt: 28
Sayfa: 289-297
Sınıflandırma :
23
Impact of the NSF State/Industry/University Cooperative Research Center on low-cost, high-speed polymer composites processing on the research and educational programs at Michigan State University
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
M Hawley , K Jayaraman , J Sticklen , B Moore , L Drzal , R.L McCullough
Yıl :
2001
Composites Part A: Applied Science and Manufacturing
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The objectives of the National Science Foundation (NSF) State of Michigan/Industry/University Cooperative Research Center on low-cost, high-speed polymer composites processing at Michigan State University (MSU) are design, development and deployment of technology and knowledge-based systems that will reduce costs of polymer composites processing by (a) insuring faster processes, (b) reducing component costs, and (c) reducing implementation times of new composite designs. Significant accomplishments have been made in research, education and technology transfer in the areas of novel processing, liquid molding, thermoplastic processing, intelligent design and process modeling, and interphases and joining. The Center's primary educational activities were supported by the National Institute of Standards and Technology-Advanced Technology Program (NIST-ATP) with General Motors and General Electric, and the Technology Reinvestment Project (TRP) with the University of Delaware and the US Department of Defense. The Center's role in the four-year NIST-ATP was to disseminate injection-molded thermoplastics design methodologies to automotive, appliance, computer and other key US industries. The program enabled the Center to develop course material, a CD-ROM design manual, and workshop materials on state of the art thermoplastics design knowledge. To date, hundreds of individuals have participated in the workshops, and the material developed in this program is being integrated into undergraduate, graduate and continuing education offerings. The TRP program brought together the NSF Center at MSU and the composite materials center at the University of Delaware (UD) in a collaborative composite materials education and training effort for the Department of Defense and the durable goods industry. Educational developments included incorporation of knowledge derived from the TRP program into 49 new or existing engineering courses (23 at MSU and 26 at UD); six experiments for a new teaching laboratory; four workshops; four videotaped instructional modules (two each for liquid molding RTM technology and the injection molding technology); interactive WEB-based simulations and tutorials; and development of knowledge-based software.
DOI : 10.1016/s1359-835x(01)00030-6
Anahtar Kelimeler : Polymer composites, B. Mechanical properties
ISSN: 1359-835X
Sayı: 8
Cilt: 32
Sayfa: 1175-1179
Sınıflandırma :
24
Enhanced thermal conductivity of commercial polystyrene filled with core-shell structured BN@PS
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Weifang Han , Yufeng Bai , Shicai Liu , Chunhua Ge , Lixia Wang , Zhiyan Ma , Yuxuan Yang , Xiangdong Zhang
Yıl :
2017
Composites Part A: Applied Science and Manufacturing
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Polystyrene-wrapped boron nitride/commercial polystyrene ([email protected]/CPS) composites with high thermal conductivity were fabricated by a novel approach. The route included two steps, [email protected] core-shell structured fillers were prepared by using modified BN and styrene (St) as the raw materials via suspension polymerization, and then the [email protected] were kneaded with the CPS by mechanically mixed method. The composite achieves a high thermal conductivity of 0.692 W/mK containing 30 wt% [email protected] (∼15.9 wt% BN), which is 3.72 times higher than that of pure CPS of ∼0.186 W/mK and 1.78 times higher than that BN/CPS blend composite with at the same BN loading of 0.332 W/mK. Compared with traditional routes, the novel preparation process requires less BN fillers when improving the same thermal conductivity. Importantly, other polymers can also encapsulate BN through this strategy, which paves a new way for preparing thermally conductive polymer-matrix composites.
DOI : 10.1016/j.compositesa.2017.08.012
Anahtar Kelimeler : A. Polystyrene-wrapped boron nitride/commercial polystyrene (email protected/CPS) composites, B. email protected filler, C. Modelling, D. Thermal properties
ISSN: 1359-835X
Cilt: 102
Sayfa: 218-227
Sınıflandırma :
Kimya %43
25
Analysis of the mechanical properties of a reinforced thermoplastic pipe (RTP)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
M KRUIJER , L WARNET , R AKKERMAN
Yıl :
2005
Composites Part A: Applied Science and Manufacturing
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This paper describes the analysis of a long length reinforced thermoplastic pipe. For this new class of pipe, which is constructed of a polyethylene liner pipe over wrapped with two layers of non-impregnated twisted aramid cords, peculiar deformation behaviour was observed when a pipe was pressurised. This behaviour was found to be a result of a difference in cord-slack between the two reinforcement layers in conjunction with an unbalanced torsion moment generated by the two reinforcing layers. Cord slack is a certain surplus length of the reinforcing cords relative to the pipe geometry. The cord-slack is estimated for the two different layers and first incorporated into an earlier published model, based on a plane stress characterisation. As no substantial improvement has been achieved by this approach, a new model based on a plane strain characterisation is introduced. This model shows good agreement with the experimentally determined strains for the hydrostatic pressure load-case.
DOI : 10.1016/s1359-835x(04)00168-x
Anahtar Kelimeler : A. Thermoplastic resin, B. Mechanical properties, D. Mechanical testing, On-shore oil industry composite pipe
ISSN: 1359-835X
Sayı: 2
Cilt: 36
Sayfa: 291-300
Sınıflandırma :
26
Bubble motion through non-crimp fabrics during composites manufacturing
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Vilnis Frishfelds , T. Staffan Lundström , Andris Jakovics
Yıl :
2008
Composites Part A: Applied Science and Manufacturing
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Bubbles motion through interbundle channels in biaxial non-crimp fabrics is modelled. The scenario is that formed bubbles move with the resin through these channels and are trapped if the channels become too narrow. By usage of a permeability network model, existing criteria on bubble deformation and a variety of analytical and probabilistic methods it is found that the paths of the bubbles depend significantly on the position of the threads keeping the fabric together and the number of fibres crossing the interbundle channels. Another result is that the pressure difference over a trapped bubble increases with 50% in a 3D geometry possible helping the bubble to escape. A third result is that, on average, the bubbles move biased to the direction of the tows. Finally, it is found that the predicted void distribution of bubbles after a major part of bubbles have moved through the system are in qualitative agreement with experimental data.
DOI : 10.1016/j.compositesa.2007.10.020
Anahtar Kelimeler : E. Resin transfer moulding (RTM), C. Statistical methods, C. Void formation, A. Non-crimp fabrics, B. Permeability
ISSN: 1359-835X
Sayı: 2
Cilt: 39
Sayfa: 243-251
Sınıflandırma :
27
Characterization of conjugated polymer/anodic aluminum oxide nanocomposites fabricated via template wetting
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Joseph P. Cannon , Steven D. Bearden , Scott A. Gold
Yıl :
2010
Composites Part A: Applied Science and Manufacturing
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Solution-based template wetting is demonstrated as an effective means of producing semiconductor–insulator nanocomposites. The properties of such nanocomposites formed by incorporating two commonly investigated semiconducting polymers, poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene (MEH-PPV) and poly(3-hexylthiophene-2,5-diyl) (P3HT), along with their blend, into nanoporous aluminum oxide (AAO) are investigated electronically and spectroscopically. Significant improvement in hole mobility of amorphous MEH-PPV in a nanocomposite with AAO while such improvement is absent when the crystalline P3HT is utilized to fabricate the AAO nanocomposites. Spectral evidence indicates that increased molecular order is responsible for this observation. Carrier mobility intermediate to the homopolymer nanocomposites was observed in composites fabricated from an MEH-PPV:P3HT blend and an AAO membrane. Spectral evidence indicates that these two polymers phase segregate in the composite.
DOI : 10.1016/j.compositesa.2010.02.014
Anahtar Kelimeler : A. Nanostructures, B. Chemical properties, B. Electrical properties
ISSN: 1359-835X
Sayı: 7
Cilt: 41
Sayfa: 836-841
Sınıflandırma :
28
Rheology and structuring in organo-ceramic composites
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
A.J McHugh , J.A Walberer
Yıl :
2001
Composites Part A: Applied Science and Manufacturing
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The processing–structure–property relationships for calcium aluminate based organo-ceramic composites are reviewed. Processing behavior was measured with a torque-outfitted Banbury mixer, structuring behavior was analyzed with electron microscopy, and mechanical properties were determined using flexural strength measurements. These results are discussed for composites composed of either a polyvinyl alcohol or phenol formaldehyde resin organic phase. The two materials have different processing behaviors, driven by different paste formation mechanisms, but are observed to have similar microstructure and mechanical properties. The rheology of model, non-calcium aluminate based composites was studied using a lubricated squeezing flow rheometer. The relaxation modulus following a step strain was measured for reactive systems that stiffened due to a crosslinking polymer phase or a polymerizing polymer phase and compared to that measured for non-reactive polydimethyl siloxane (PDMS) systems with filler fractions from 0 to 65% by volume and 65% filled PDMS of differing molecular weights. Comparison of the normalized relaxation moduli of the model reactive and non-reactive materials suggests similarities between the effect of filler amount and crosslinking amount and between the combined effects of molecular weight and filler amount and the degree of polymerization.
DOI : 10.1016/s1359-835x(00)00179-2
Anahtar Kelimeler : A. Ceramicu2013matrix composites (CMCs), B. Mechanical properties, D. Electron microscopy, Rheology
ISSN: 1359-835X
Sayı: 8
Cilt: 32
Sayfa: 1085-1093
Sınıflandırma :
29
IFC - Editorial Board
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yıl :
2014
Composites Part A: Applied Science and Manufacturing
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DOI : 10.1016/s1359-835x(13)00331-x
ISSN: 1359-835X
Cilt: 57
Sayfa: IFC
Sınıflandırma :
30
Fibre orientation of novel dynamically sheet formed discontinuous natural fibre PLA composites
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
M.G. Aruan Efendy , K.L. Pickering
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
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This paper describes work carried out to fabricate and to assess the fibre orientation in PLA reinforced by aligned discontinuous harakeke and hemp fibre mats produced using a dynamic sheet former (DSF). These mats were combined with PLA sheets to make composites with fibre contents of 5–40 wt% using a hot press. It was found that the fibre orientation factors (Kθ) for both harakeke and hemp fibre composites were higher than those values seen in the literature for composites prepared using injection moulding and hot pressed using randomly oriented fibre mats, but slightly lower than the highest values obtained with aligned fibre nonwoven preform composites utilising more processing stages. The highest Kθ values for harakeke and hemp fibres in this work were found to be 0.58 and 0.44 respectively. Kθ decreased, reflecting increased fibre misalignment as fibre content increased, believed to be due to fibre agglomeration and the higher pressure required during processing.
DOI : 10.1016/j.compositesa.2016.07.003
Anahtar Kelimeler : A: Discontinuous reinforcement, C: Analytical modelling, D: Mechanical testing, E: Compression moulding
ISSN: 1359-835X
Cilt: 90
Sayfa: 82-89
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