• Piri Keşif Aracı

Arama ipuçları nelerdir?
1.  sayfa ve
1
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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
2
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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
3
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
Yayıncı Web Sitesi
Tam Metin
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 :
4
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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
5
Vibration-based delamination detection in curved composite plates
Dergi Makalesi

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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
6
Analysis of the mechanical properties of a reinforced thermoplastic pipe (RTP)
Dergi Makalesi

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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
7
Bubble motion through non-crimp fabrics during composites manufacturing
Dergi Makalesi

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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
8
Rheology and structuring in organo-ceramic composites
Dergi Makalesi

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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
9
Effect of thermal cycling on the microstructure of continuous carbon fibre reinforced copper matrix composites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
J. Koráb , G. Korb , P. Štefánik , H.P. Degischer
Yıl :
1999
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Copper reinforced by continuous carbon fibres is a candidate material for heat sinks of electronic modules. The thermal expansion can be matched to the adjacent ceramics and the thermal conductivity is higher than that of alternative materials. Because the material is expected to work in cyclic thermal conditions during application its structure must withstand such a load without any severe damage. The structure of unidirectionally and cross-ply fibre reinforced samples was observed before and after thermal cycling by optical microscopy and Scanning Electron Microscopy (SEM). SEM was used for examining the fibre-matrix interface before and after thermal cycling. Optical microscopy showed the arrangement of individual monolayers. The influence of adding copper foils between individual monolayers on the structure of the material is reflected in a reduction in the number of cracks in monolayers.
DOI : 10.1016/s1359-835x(98)00200-0
Anahtar Kelimeler : A. Metal matrix composites (MMCs), Thermal cycling
ISSN: 1359-835X
Sayı: 8
Cilt: 30
Sayfa: 1023-1026
Sınıflandırma :
10
The Double Drum Peel (DDP) test: A new concept to evaluate the delamination fracture toughness of cylindrical laminates
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
F. Daghia , C. Cluzel , L. Hébrard , F. Churlaud , B. Courtemanche
Yıl :
2018
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Standard delamination tests of monolithic composites prescribe configurations where the crack is a symmetry plane for both overall geometry and stacking sequence, ensuring a controlled mode ratio. These normalized configurations do not enable testing of curved specimens, like those manufactured by filament winding. Here, we propose a new concept for the delamination testing of cylindrical laminates, the Double Drum Peel, related to the peel tests used for adhesives or thin-films debonding. A global energy analysis, including all sources of energy release and dissipation, provides the expression of the critical strain energy release rate. As in the classical peel test, the energy dissipated by mechanisms other than delamination should be accounted for to determine intrinsic interface properties. The local mode mixity is evaluated based on analytical results on the classical peel test. Tests using carbon-peek rings manufactured by laser assisted tape placement are presented to illustrate the potential of the DDP.
DOI : 10.1016/j.compositesa.2018.07.020
Anahtar Kelimeler : B. Delamination, D. Mechanical testing, E. Filament Winding, E. Tape placement
ISSN: 1359-835X
Cilt: 113
Sayfa: 83-94
Sınıflandırma :
11
Synergetic effect of Fe3O4 nanoparticles and carbon on flexible poly (vinylidence fluoride) based films with higher heat dissipation to improve electromagnetic shielding
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Haoran Cheng , Shengnan Wei , Youxin Ji , Jinsheng Zhai , Xiaoli Zhang , Jingbo Chen , Changyu Shen
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Flexible Poly (vinylidene fluoride) (PVDF)/Fe3O4/carbon films were prepared through the solution processing and compression molding method. The electrical conductivity and the electromagnetic interference (EMI) shielding properties of these composites were gradually increased with the increasing of CNTs or GNPs content, as well as the film thickness. Total shielding of the 8 wt% CNTs (Carbon Nanotubes) and GNPs (Graphenes) filled PVDF/Fe3O4 composites increased from 14.1 to 32.7 dB, and 16.2 to 35.6 dB, while the film thickness was increased from 0.5 to 1.1 mm, respectively. Due to the synergetic effect of Fe3O4 nanoparticles and CNTs or GNPs, the final EMI shielding of the composites could be mainly attributed to the absorption process. Moreover, the fabricated films possess higher thermal conductivities, which can convert microwave energy into Joule heating systems. These functional films have the potential usage in making high-efficiency EMI shielding devices with rapid heat dissipation.
DOI : 10.1016/j.compositesa.2019.03.019
Anahtar Kelimeler : A: Polymer-matrix composites, B: Electrical properties, B: Magnetic properties, B: Microstructures
ISSN: 1359-835X
Cilt: 121
Sayfa: 139-148
Sınıflandırma :
12
Formulation optimization of bioreinforced composites from polyolefins and dried distillers’ grains using statistical methods
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Nima Zarrinbakhsh , Amar K. Mohanty , Manjusri Misra
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Polymer composites of polyolefins and dried distillers’ grains (DDG), a coproduct of corn ethanol industries, are investigated. The matrix contains polypropylene (PP), maleated PP (PPgMA), and maleated ethylene-propylene-diene monomer rubber (EPDMgMA). Utilizing DDG as a filler and/or reinforcing agent in novel bioreinforced polymer composites ultimately leads to value-addition to this material and increases its profitability to the corn ethanol sector. Several mechanical, thermomechanical and physical properties are investigated in this work. By implementing statistical methodologies and tools to optimize the composite formulation, it is observed that replacing PP partially by 10, 2.4 and 2.2 wt% of DDG, PPgMA and EPDMgMA, respectively, results in a composite formulation with mechanical and physical properties very comparable to the studied neat PP but with higher bio-based content. Also through statistical analysis, a composite formulation is identified that exhibits more than 200% improvement in impact strength compared to the studied neat PP.
DOI : 10.1016/j.compositesa.2019.01.017
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), A. Particle-reinforcement, C. Statistical properties/methods, D. Mechanical testing
ISSN: 1359-835X
Cilt: 119
Sayfa: 246-260
Sınıflandırma :
13
Material characterisation and calibration of a meso-mechanical damage model for braid reinforced composites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
A.K. Pickett , M.R.C. Fouinneteau
Yıl :
2006
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Cost effective braid reinforced composites are a potential substitute for metals in many automotive structural applications where good mechanical performance combined with high energy absorption are of special interest. This paper presents experimental work undertaken to characterise braided composites and a meso-mechanical damage model suitable for the impact and crash analysis of braided composites. The model presented correctly represents stiffness, initial failure and the post failure damage response, which is of particular importance for crash applications. Furthermore, work is presented that describes testing procedures, which should be followed in order to obtain the correct material parameters for analysis. Finally, validation of the testing procedures and the constitutive model is made against a structural braid reinforced composite beam loaded to failure under four point bending.
DOI : 10.1016/j.compositesa.2005.03.034
Anahtar Kelimeler : C. Damage mechanics, D. Mechanical testing, C. Finite element analysis, Composites
ISSN: 1359-835X
Sayı: 2
Cilt: 37
Sayfa: 368-377
Sınıflandırma :
14
Behavior of 3D orthogonal woven CFRP composites. Part I. Experimental investigation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Ping Tan , Liyong Tong , G.P. Steven , Takashi Ishikawa
Yıl :
2000
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
This paper presents an experimental investigation of the mechanical behavior and failure mechanism of three-dimensional (3D) orthogonal woven CFRP composite panels. The 3D composite panels are preformed using Torayca T-300 (3K) carbon fiber, and then infused with the Epicote 828 epoxy resin. The nominal proportions of the stuffer yarn, the filler yarn and the warp weaver (or z yarn) are 1:1.2:0.2, respectively, and the overall fiber volume fraction is 43%. The 3D fiber architectures are measured and visualized in a micrograph form. Quasi-static tensile coupon tests are carried out to measure the in-plane Young's modulus, Poisson's ratio, tensile failure strengths and failure strains in both stuffer and filler yarn directions. Test results reveal that the average Young's modulus in the filler yarn direction is higher than that in the stuffer yarn direction, and the average failure strain in the filler yarn direction is lower than that in the stuffer yarn direction. The average failure strength in the filler yarn direction is slightly higher than that in the stuffer yarn direction. The fracture surfaces are studied using the scanning electron microscope (SEM) and the failure mechanism are then discussed. It is noted by studying the fracture surface that the fracture surface is always perpendicular to the loading direction. The crack causes the z yarn/matrix interface to debond. Also, the fracture of specimen cut along the x- (or stuffer yarn) direction causes filler yarn/matrix interface to debond and stuffer yarn to break, and the fracture of specimen cut along the y- (or filler yarn) direction causes stuffer yarn/matrix interface to debond and filler yarn to break. The testing results are then used to validate the developed models in Parts II and III of these series papers. In Part II, simplified analytical and finite element models are proposed to predict the mechanical property and failure strengths for the 3D orthogonal woven CFRP composites. In Part III, a curved beam model resting on an elastic foundation is presented to predict the tensile strength in the filler direction, and then to investigate the effect of some geometrical parameters on the tensile failure strength in the filler yarn direction.
DOI : 10.1016/s1359-835x(99)00070-6
Anahtar Kelimeler : 3D orthogonal woven CFRP composites, B. Strength, B. Mechanical properties, B. Fracture
ISSN: 1359-835X
Sayı: 3
Cilt: 31
Sayfa: 259-271
Sınıflandırma :
15
Enhanced breakdown strength of aligned-sodium-titanate- nanowire/epoxy nanocomposites and their anisotropic dielectric properties
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Siyu Chen , Yonghong Cheng , Qian Xie , Bing Xiao , Zhengdong Wang , Jingya Liu , Guanglei Wu
Yıl :
2019
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
In this work, sodium titanate (Na2Ti6O13) nanowire/epoxy nanocomposites with different nanowire alignments and thicknesses were fabricated by employing the DC electric field during curing process. Nanocomposites showed obvious anisotropic dielectric properties. When nanowires were aligned perpendicularly to the electric field directions (X-Y-aligned), the breakdown strength (EB) of nanocomposites with thickness of 1 mm and 0.5 wt% nanowires increased by 9.6% or 11%, compared to that of pure epoxy or no-alignment nanocomposites. When the thickness decreases to 10 μm, the EB enhancement further increased to 87%, compared to that of no-alignment samples. Thermally stimulated discharge current (TSDC) results indicated that more electronic deep traps were introduced perpendicular to alignment direction of nanowires and more shallow traps existed in the direction parallel to the oriented nanowires. The origin of the anisotropy in EB of nanocomposites was studied by analyzing the orientations of interfaces and the nanowires’ anisotropic crystal structure. This work gives invaluable guidelines for designing of thermoset functional materials.
DOI : 10.1016/j.compositesa.2019.02.024
Anahtar Kelimeler : Epoxy nanocomposites, Directional orientation, Anisotropy, Dielectric properties, Breakdown strength
ISSN: 1359-835X
Cilt: 120
Sayfa: 84-94
Sınıflandırma :
16
Design guidance and structural integrity of bonded connections in GRE pipes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
E.M Knox , S Lafferty , M.J Cowling , S.A Hashim
Yıl :
2001
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Extensive research, involving a large programme of both experimental and numerical analyses, has been undertaken into the structural integrity of adhesively bonded GRE composite taper/taper pipe joints. Initial studies investigated the short-term static performance under various modes of loading and these were followed by studies of long-term creep performance. A significant element of the research was a study of the effect that defects in the adhesive bond have on the overall performance of the bonded joint-pipe system. The numerical analyses were correlated with the experimental data for validation of the computer simulations and failure predictions. The results of the research demonstrate the substantial defect tolerance of the bonded composite components. From the results it is possible to present guidelines for residual strength, deflection and the effects of defect size, as a function of pipe diameter, temperature and time. Such guidelines may be used at the initial design stage or to inform inspection and repair strategies.
DOI : 10.1016/s1359-835x(00)00114-7
Anahtar Kelimeler : A. Polymeru2013matrix composites, B. Defects, C. Finite element analysis, Pipe joints/joining
ISSN: 1359-835X
Sayı: 2
Cilt: 32
Sayfa: 231-241
Sınıflandırma :
17
Influence of the anisotropy of sisal fibers on the mechanical properties of high performance unidirectional biocomposite lamina and micromechanical models
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Bernardo Zuccarello , Carmelo Militello , Francesco Bongiorno
Yıl :
2021
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
High performance biocomposites reinforced by sisal fibers, are between the most promising materials that could be used in various fields, from automotive to civil constructions, thanks to their good mechanical performance, as well as to the low cost and the great availability of the fiber. Nevertheless, at present their practical use is prevented by the limited knowledge of their mechanical performance. The results of the present study have shown that the intimate fibrillar structure of the sisal fiber is associated with a high anisotropy involving not only the elastic parameters, but also the damage processes with typical fiber splitting phenomena, that influence noticeably the biocomposite strength under transversal tensile/compressive, longitudinal compressive and shear loading. Also, they have permitted to implement new micromechanical models that can be used at the design stage, in all practical structural applications where low cost green biocomposites reinforced by sisal long fiber could be advantageously used.
DOI : 10.1016/j.compositesa.2021.106320
Anahtar Kelimeler : A. Biocomposite, A. Natural fibers, B. Anisotropy, C. Micro-mechanics
ISSN: 1359-835X
Cilt: 143
Sayfa: 106320
18
Quantitative assessment of nanofiller dispersion based on grayscale image analysis: A case study on epoxy/carbon nanocomposites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Federica Zaccardi , M. Gabriella Santonicola , Susanna Laurenzi
Yıl :
2018
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Filler dispersion in polymer matrices plays an important role in defining the performance of nanocomposite materials. Here, a novel method for the quantitative assessment of filler dispersion is reported. The method is based on the direct analysis of optical images using an algorithm implemented in MATLAB, which considers the distance of each pixel with respect to pixels of same value and to pixels of different value. A dispersion index is determined by comparing the grayscale optical image with the corresponding uniformly dispersed image. The algorithm was used to study the dispersion state of samples containing different types of graphene nanoplatelets dispersed in Prime 20 LV epoxy at different concentrations and sonication times. Image analysis via the proposed algorithm resulted to be coherent with the qualitative assessment which can be inferred from visual inspection, that is the dispersion degree becomes worse at increasing loading and improves when increasing the sonication time.
DOI : 10.1016/j.compositesa.2018.10.003
Anahtar Kelimeler : A. Dispersion, A. Nanocomposites, B. Quantitative analysis, C. Graphene nanoplatelets
ISSN: 1359-835X
Cilt: 115
Sayfa: 302-310
Sınıflandırma :
19
Towards the design of sandwich panel composites with enhanced mechanical and thermal properties by variation of the in-plane Poisson's ratios
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
J.P.M. Whitty , A. Alderson , P. Myler , B. Kandola
Yıl :
2003
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The finite element (FE) method has been used to study the mechanical and thermal properties of both conventional and re-entrant (i.e. negative Poisson's ratio) honeycombs, which may be used as the cores of sandwich panel composites. Failure of the honeycomb structures was simulated using a crack propagation method developed in-house. The cell-wall stress build up in the conventional honeycomb was calculated to be significantly reduced relative to the re-entrant honeycomb under (2D) hydrostatic loading, implying that the conventional core will undergo significantly less internal damage than the re-entrant core. Conversely, the re-entrant honeycomb performs better than the conventional honeycomb under thermal loading conditions. The size and pathway of the crack formed during the simulation is dependent on the failure stress distribution used in the crack propagation routine.
DOI : 10.1016/s1359-835x(03)00058-7
Anahtar Kelimeler : Auxetic, A. Honeycomb, B. Defects, C. Finite element analysis
ISSN: 1359-835X
Sayı: 6
Cilt: 34
Sayfa: 525-534
Sınıflandırma :
20
Experimental comparative study of the variants of high-temperature vacuum-assisted resin transfer moulding
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Masoud Bodaghi , Ricardo Costa , Rui Gomes , João Silva , Nuno Correia , Fernando Silva
Yıl :
2020
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A considerable collection of VARTM choices for composite manufacturing techniques can be both found in literature as well as in industry. Each manufacturing process provides different benefits that must be carefully considered depending on the final application of the desired composite. Here, we present a performance comparison in terms of process effectiveness related to fibre volume fraction, the magnitude of thickness variation, and void contents of 16 laminated composites manufactured by different variants of VARTM (DBVI, VAP, and CAPRI) as well as HIPRTM. Non-crimp carbon textile reinforcements and five-harness satin woven carbon textile reinforcements with a PRISM® EP2400 resin system as base constituents are used to produce composite panels. After manufacturing 16 composite panels, an evaluation of the pros and cons of the processing vs properties/performance obtained with each of them is discussed.
DOI : 10.1016/j.compositesa.2019.105708
Anahtar Kelimeler : A. Resin transfer moulding, E. Vacuum infusion, B. Defects, D. Fabrics
ISSN: 1359-835X
Cilt: 129
Sayfa: 105708
Sınıflandırma :
21
Effect of process engineering on the performance of natural fiber reinforced cellulose acetate biocomposites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
A.K Mohanty , A Wibowo , M Misra , L.T Drzal
Yıl :
2004
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Eco-friendly green/biocomposites were fabricated from chopped hemp fiber and cellulose ester biodegradable plastic through two process engineering approaches: powder impregnation through compression molding (process I) and extrusion followed by injection molding (process II). Cellulose ester, e.g. cellulose acetate (CA) plasticized with 30 wt% citrate plasticizer (CAP) was used as the matrix polymer for biocomposite fabrication. Intimate mixing due to shear forces experienced in process II produced superior strength biocomposites over their counterparts made using process I. Biocomposite fabricated through process II containing 30 wt% hemp natural fiber showed an improvement of storage modulus by 150% over the virgin matrix polymer. The coefficient of thermal expansion of the said biocomposite decreased from the CAP polymer by 60% whereas the heat deflection temperature improved by 30% versus the virgin bioplastic, indicating superior thermal behavior of the biocomposite. Plasticized cellulose acetate is proved to be much better matrix than non-polar polypropylene (PP) for hemp fiber (HF) reinforcements because of the better interaction of polar cellulose ester with the polar natural fiber. Fabricated through process II and with same content of hemp (30 wt%) the CAP-HF based biocomposite exhibited flexural strength of 78 MPa and modulus of elasticity of 5.6 GPa as contrast to 55 MPa and 3.7 GPa for the corresponding PP-HF based composite. The experimental findings of tensile modulus of the biocomposites are compared with the theoretical modulus using the rule of mixture. The fiber-matrix adhesion is evaluated through environmental scanning electron microscopy studies.
DOI : 10.1016/j.compositesa.2003.09.015
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), B. Thermomechanical, E. Extrusion, E. Injection moulding, Natural fibers
ISSN: 1359-835X
Sayı: 3
Cilt: 35
Sayfa: 363-370
Sınıflandırma :
22
The influence of fibre length and concentration on the properties of glass fibre reinforced polypropylene: 7. Interface strength and fibre strain in injection moulded long fibre PP at high fibre content
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
J.L. Thomason
Yıl :
2007
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The mechanical performance of injection moulded long glass fibre reinforced polypropylene with a glass fibre content in the range 0–73% by weight has been investigated. The composite modulus exhibited a linear dependence on fibre content over the full range of the study. Composite strength and impact resistance exhibited a maximum in performance in the 40–50% by weight reinforcement content range. The residual fibre length, average fibre orientation, interfacial shear strength, and fibre strain at composite failure in the samples have been characterised. These parameters were also found to be fibre concentration dependent. The interfacial shear strength was found to be influenced by both physical and chemical contributions. Theoretical calculations of the composite strength using the measured micromechanical parameters enabled the observed maximum in tensile strength to be well modelled.
DOI : 10.1016/j.compositesa.2006.01.007
Anahtar Kelimeler : A. Glass fibres, A. Thermoplastic resin, B. Interface, E. Injection moulding
ISSN: 1359-835X
Sayı: 1
Cilt: 38
Sayfa: 210-216
Sınıflandırma :
23
5483043 Induction heating of polymer matrix composites in a mold press
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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
DOI : 10.1016/1359-835x(96)88895-6
ISSN: 1359-835X
Sayı: 11
Cilt: 27
Sayfa: 1109-1110
Sınıflandırma :
24
Study on UV laser machining quality of carbon fibre reinforced composites
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Z.L. Li , H.Y. Zheng , G.C. Lim , P.L. Chu , L. Li
Yıl :
2010
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
The large differences in material properties of the carbon fibre and the epoxy resin in carbon fibre reinforced plastic (CFRP) composite make laser processing very challenging. The heat affected zone (HAZ) has been the major obstacle for wide industry applications of laser machining of CFRP composites. This paper investigates the quality of CFRP machined by a diode pumped solid state (DPSS) UV laser. The results show that minimum HAZ (about 50 μm) is achievable in machining of CFRP composite by using short pulsed UV laser. The study found that heat is easily accumulated in the material during laser processing, especially when the carbon fibres are sliced into small pieces. The paper discusses how to make use of the heat accumulation and how to avoid potential damage by the heat accumulation. Bearing strengths test and fracturing mechanisms study were conducted. Method of characterization of thermal damage in polymer matrix is developed.
DOI : 10.1016/j.compositesa.2010.05.017
Anahtar Kelimeler : A. Carbon fibre, A. Polymeru2013matrix composite, D. Mechanical testing, E. Cutting
ISSN: 1359-835X
Sayı: 10
Cilt: 41
Sayfa: 1403-1408
Sınıflandırma :
25
Influence of thermoplastic diffusion on morphology gradient and on delamination toughness of RTM-manufactured composites
Dergi Makalesi

Dergi Makalesi
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
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
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 :
26
A novel montmorillonite with β-nucleating surface for enhancing β-crystallization of isotactic polypropylene
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Xin Dai , Zishou Zhang , Chunguang Wang , Qian Ding , Juan Jiang , Kancheng Mai
Yıl :
2013
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Montmorillonite (MMT) generally has α-nucleating ability for isotactic polypropylene (iPP). A novel MMT with β-nucleating surface (β-MMT) supported by chemically calcium pimelate (CaA) was prepared through the chemical reaction between pimelic acid (HA) and calcium ion on the surface of MMT in the first time. Infrared spectrometry and thermogravimetric analysis confirmed the formation of CaA on the surface of MMT. The differential scanning calorimeter and X-ray diffraction illustrated that the iPP nanocomposites filled by MMT and β-MMT exhibit different heterogeneous nucleation. The heterogeneous nucleation of the prepared MMT surface has changed from α-nucleation into β-nucleation and a novel MMT with β-nucleating surface is obtained. Even, the heterogeneous β-nucleating ability of β-MMT is much stronger than that of CaA. Addition of MMT with β-nucleating surface into iPP matrix significantly increased the spherulite nuclei density and decreased the spherulite size, and can easily prepare the β-iPP nanocomposites with high relative β-phase content.
DOI : 10.1016/j.compositesa.2013.01.016
Anahtar Kelimeler : A. Polymeru2013matrix composites (PMCs), B. Thermal properties, D. Optical microscopy Physical methods of analysis, E. Surface treatments
ISSN: 1359-835X
Cilt: 49
Sayfa: 1-8
Sınıflandırma :
27
Micro-CT analysis of internal geometry of chopped carbon fiber tapes reinforced thermoplastics
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Yi Wan , Ilya Straumit , Jun Takahashi , Stepan V. Lomov
Yıl :
2016
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Adequate characterization of the internal geometry of random fiber composites for prediction of their properties requires acquisition and analysis of vast amount of data. The present work proposes a method to measure and quantify the internal geometry of ultra-thin chopped carbon fiber tape reinforced thermoplastics (UT-CTT), a kind of randomly oriented strands, using the X-ray micro-CT. The two-scale fiber orientation distributions (orientation of the tapes and of the fibers inside the tapes), tape morphology, 3D structure and orientation misalignment were characterized using a specialized image processing methodology. The results indicate that the applied method can provide detailed information like primary orientation directions, tape waviness and splitting of the internal geometry of UT-CTT. UT-CTTs produced with different molding pressure were studied to confirm the capability of the methodology in distinguishing subtle structure changes caused by different molding conditions.
DOI : 10.1016/j.compositesa.2016.10.013
Anahtar Kelimeler : A. Polymer-matrix composites (PMCs), B. Microstructures, D. CT analysis, D. Microstructural analysis
ISSN: 1359-835X
Cilt: 91
Sayfa: 211-221
Sınıflandırma :
28
Finite element modelling of the impact response of fibre metal laminates under tension preloading
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
M. Rathnasabapathy , A.P. Mouritz , A.C. Orifici
Yıl :
2022
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
A finite element (FE) model to accurately compute the low energy impact response and impact damage to fibre metal laminates (FMLs) under tension preloading is described. The FE model can predict the initiation and progression of impact damage that includes metal plastic deformation, delamination damage, and debonding along the metal-composite interfaces. The accuracy of the FE model is evaluated using experimental data for an aluminium/glass-epoxy FML. The FML was impacted at different energy levels while preloaded to different tension strain levels. The FE model accurately predicted the peak impact load, impact-time response, absorbed impact energy and bulk deformation of the FML for the different impact energy and preload conditions. The FE model also accurately calculated the amount of plastic deformation damage to the metal sheets and delamination damage to the composite sheet, which were dependent on the tension preload strain.
DOI : 10.1016/j.compositesa.2022.106930
Anahtar Kelimeler : Finite element modelling, Fibre Metal Laminates, Preload, Impact
ISSN: 1359-835X
Cilt: 157
Sayfa: 106930
29
Auto-catalytic high-performance recyclable carbon fiber reinforced epoxy composites mediated by neighboring group participation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier BV
Yazar(lar) :
Zihan Zhao , Jianqiao Wu , Liang Gao , Haojie Gong , Zhongkai Guo , Baoyan Zhang , Min-Hui Li , Jun Hu
Yıl :
2022
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
Epoxy-based carbon fiber reinforced composites (CFRCs) are leading contenders in high-tech fields. However, the majority of CFRCs consisted of thermoset matrix and carbon fibers (CFs) are costly to produce and difficult to recycle. In this study, this problem has been solved by a simple strategy to prepare high-performance recyclable CFRCs from commercial-scale low-cost phthalic anhydride (PA) and diglycidyl ester of aliphatic cyclo (DGEAC). The rigid DGEAC/PA networks resulted in a glass transition temperature of ∼214°C, a tensile strength of ∼79 MPa, and a Young’s modulus of ∼1.84 GPa. More importantly, the neighboring group participation (NGP) effect facilitated the transesterification reactions (TERs), making DGEAC/PA networks degradable in ethylene glycol. Accordingly, the CF/DGEAC/PA composites exhibited good mechanical properties comparable to conventional epoxy CFRCs, and the CFs could be recycled completely with similar features of the virgin CFs. This work provides an auto-catalytic sustainable approach for high-performance degradable CFRCs.
DOI : 10.1016/j.compositesa.2022.107160
Anahtar Kelimeler : (A) Polymer-matrix composites (PMCs), (A) Thermosetting resin, (A) Recycling, (D) Microstructural analysis
ISSN: 1359-835X
Sayfa: 107160
30
Improvement of the mechanical properties and thermal conductivity of poly(ether-ether-ketone) with the addition of graphene oxide-carbon nanotube hybrid fillers
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Composites Part A: Applied Science and Manufacturing
Yayıncı:
Elsevier
Yazar(lar) :
Yongseon Hwang , Myeongjin Kim , Jooheon Kim
Yıl :
2013
Composites Part A: Applied Science and Manufacturing
Yayıncı Web Sitesi
Tam Metin
Kaydet Alıntıla
An organic/inorganic nanocomposite was prepared based on poly(ether-ether-ketone) (PEEK) containing either ethyl-aminated or phenyl-aminated GO/MWCNT (E-GC or P-GC) hybrid fillers. The introduction of E-GC and P-GC to the PEEK matrix improved the thermal conductivity and mechanical properties. The thermal conductivities of 1 wt.% GO/PEEK increased to 0.36 W/mK and the introduction of 0.5 wt.% ethyl-aminated and phenyl-aminated MWCNT with 1 wt.% chlorinated GO in the PEEK showed enhanced thermal conductivities. The storage modulus of PEEK composite was higher than that of raw PEEK, and the P-GC containing PEEK had the most enhanced value.
DOI : 10.1016/j.compositesa.2013.08.010
Anahtar Kelimeler : A. Polymeru2013matrix composites (PMCs), B. Thermal properties, C. Finite element analysis (FEA), D. Thermal analysis
ISSN: 1359-835X
Cilt: 55
Sayfa: 195-202
Sınıflandırma :
Kimya %30
Nanokimya %30

Yayın Yılı

Sınırla

Doküman Türü
Tümü

Veri Tabanı
Tümü

  Tüm Veritabanlarını Gör

Dergi İsmi
Tümü

Disiplin
Tümü

Disipline Göre İlgililik

Alt Disiplin
Tümü

Konu
Tümü

Yayıncı
Tümü

Lisan
Tümü

X
Filtreler