The effects of interfacial debonding on the elastoplastic response of unidirectional silicon carbide—titanium composites

2010 ◽  
Vol 224 (2) ◽  
pp. 259-269 ◽  
Author(s):  
M J Mahmoodi ◽  
M M Aghdam ◽  
M Shakeri
Keyword(s):  
Volume Fraction ◽  
Yield Criterion ◽  
Fibre Volume Fraction ◽  
Three Dimensional ◽  
Fibre Volume ◽  
Interfacial Debonding ◽  
Successive Approximation Method ◽  
Interface Damage ◽  
The Matrix ◽  
Von Mises

A three-dimensional micromechanics-based analytical model is presented to investigate the effects of initiation and propagation of interface damage on the elastoplastic behaviour of unidirectional SiC—Ti metal matrix composites (MMCs) subjected to off-axis loading. Temperature-dependent properties are considered for the matrix. Manufacturing process thermal residual stress (RS) is also included in the model. The selected representative volume element consists of r× c unit cells in which a quarter of the fibre is surrounded by matrix sub-cells. The constant compliance interface model is used to model interfacial debonding and the successive approximation method together with von Mises yield criterion is used to obtain elastoplastic behaviour. Dominance mode of damage including fibre fracture, interfacial debonding, and matrix yielding and ultimate tensile strength of the SiC—Ti MMC are predicted for various loading directions. The effects of thermal RS and fibre volume fraction on the stress—strain response of the SiC—Ti MMC are studied. Results revealed that for more realistic predictions, both interface damage and thermal RS effects should be considered in the analysis. The contribution of interfacial debonding and thermal RS in the overall behaviour of the material is also investigated. Comparison between results of the presented model shows very good agreement with the finite-element micromechanical analysis and experiment for various off-axis angles.

scholarly journals Thermal conductivity of textile reinforcements for composites

2018 ◽  
Vol 1 ◽  
pp. 251522111775115 ◽  
Author(s):  
Yue El-Hage ◽  
Simon Hind ◽  
François Robitaille
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fibre ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Three Dimensional ◽  
Fibre Volume ◽  
Published Data ◽  
Manufacturing Processes ◽  
Composites Manufacturing ◽  
The Relationship

Thermal conductivity data for dry carbon fibre fabrics are required for modelling heat transfer during composites manufacturing processes; however, very few published data are available. This article reports in-plane and through-thickness thermal conductivities measured as a function of fibre volume fraction ( Vf) for non-crimp and twill carbon reinforcement fabrics, three-dimensional weaves and reinforcement stacks assembled with one-sided carbon stitch. Composites made from these reinforcements and glass fibre fabrics are also measured. Clear trends are observed and the effects of Vf, de-bulking and vacuum are quantified along with orthotropy ratios. Limited differences between the conductivity of dry glass and carbon fibre fabrics in the through-thickness direction are reported. An unexpected trend in the relationship between that quantity and Vf is explained summarily through simple simulations.

scholarly journals Fabrication and Characterization of Unidirectional Silk Fibre Composites

2011 ◽  
Vol 471-472 ◽  
pp. 20-25 ◽  
Author(s):  
Mansur Ahmed ◽  
Md. Saiful Islam ◽  
Qumrul Ahsan ◽  
Md Mainul Islam
Keyword(s):  
Volume Fraction ◽  
Flexural Modulus ◽  
Fibre Volume Fraction ◽  
Initial Study ◽  
Fibre Volume ◽  
Silk Fibre ◽  
Specific Strength ◽  
Pull Out ◽  
The Matrix ◽  
Strength And Stiffness

Natural fibres offer a number of benefits as reinforcement for synthetic polymers since they have high specific strength and stiffness, high impact strength, biodegradability etc. The aim of this study is to fabricate and determine the performance of unidirectional silk fibre reinforced polymer composites. In the present initial study, alkali treated silk fibres were incorporated as reinforcing agent, while a mixture of 20% maleic anhydride grafted polypropylene (MAPP) and commercial grade polypropylene (PP) was used as matrix element. The unidirectional composites were fabricated by using hot compression machine under specific pressure, temperature and varying fibre loading. Tensile, flexural, impact and hardness tests were carried out by varying silk fibre volume fraction. Composites containing 45% fibre volume fraction had higher tensile and flexural strength, Young’s modulus and flexural modulus compared to other fabricated composites including those with untreated silk fibres. SEM micrographs were taken to examine composite fracture surface and interfacial adhesion between silk fibre and the matrix. These micrographs suggested less fibre pull out and better interfacial bonding for 40% fibre reinforced composites.

Analysis of Interfacial Debonding in Three-Dimensional Composite Microstructures

2005 ◽  
Vol 128 (1) ◽  
pp. 96-106 ◽  
Author(s):  
Shriram Swaminathan ◽  
N. J. Pagano ◽  
Somnath Ghosh
Keyword(s):  
Cohesive Zone ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Interfacial Debonding ◽  
Fiber Model ◽  
Unidirectional Fibers ◽  
Fiber Spacing ◽  
Commercial Code ◽  
Initiation And Propagation ◽  
The Matrix

This paper is aimed at analyzing stresses and fiber-matrix interfacial debonding in three-dimensional composite microstructures. It incorporates a 3D cohesive zone interface model based element to simulate interfacial debonding in the commercial code ABAQUS. The validated element is used to examine the potential debonding response in the presence of fiber–fiber interactions. A two-fiber model with unidirectional fibers is constructed and the effect of relative fiber spacing and volume fraction on the stress distribution in the matrix is studied. In addition, the effect of fiber orientation and spacing on the nature of initiation and propagation of interfacial debonding is studied in a two-fiber model. These results are expected to be helpful in formulating future studies treating optimal fiber orientations and payoff in controlling fiber spacing and alignment.

Effect of Different Vacuum Pressure on the Tensile Properties of Sugar Palm Frond Fibre Reinforced Polyester Composites

2013 ◽  
Vol 701 ◽  
pp. 23-27
Author(s):  
S.A. Syed Azuan ◽  
M.M. Saufi ◽  
M.G. Azniah ◽  
J.M. Juraidi
Keyword(s):  
Tensile Properties ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Tensile Modulus ◽  
Fibre Volume ◽  
Vacuum Pressure ◽  
The Matrix ◽  
Polyester Composites ◽  
The One ◽  
Palm Frond

Sugar palm frond fibre has a potential to be as reinforcement in natural fibres reinforced polyester composites. This paper investigates the tensile properties of sugar palm frond fibre reinforced polyester composites. The sugar palm frond fibres were mixed with polyester composites at the 5 % fibre volume fraction with three different vacuum pressure of 5, 10 and 15 psi. The composites panels were fabricated using a vacuum bagging techniques. The tensile test was carried out in accordance to ASTM D638 respectively. The results showed that the vacuum pressure at 15 psi gave maximum value for tensile strength and tensile modulus. The results indicate that by increasing the vacuum pressure, it created a better bonding between fibre and the matrix. Minitab software was used to perform the one-way ANOVA analysis to measure the significant. From the analysis, there is a significant effect of vacuum pressure on the tensile properties.

The Strength of Fibres in All-Ceramic Composites

1986 ◽  
Vol 78 ◽  
Author(s):  
Kevin Kendall ◽  
N. Mcn. Alford ◽  
J. D. Birchall
Keyword(s):  
Elastic Modulus ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Ceramic Composites ◽  
Fibre Volume ◽  
Matrix Cracking ◽  
Fibre Strength ◽  
All Ceramic ◽  
The Matrix ◽  
Fibre Matrix

ABSTRACTWhen considering the strength of a fibre reinforced ceramic composite, it is often assumed that the fibres retain their full strength of several GPa after cracking of the weaker matrix. The strength of the composite after matrix cracking is then calculated by the rule of mixtures as the product of fibre volume fraction and fibre strength. This paper demonstrates that such a calculation is not consistent with the principles of fracture mechanics for an isolated fibre embedded in an elastic matrix of the same elastic modulus, because the strength of the fibre is much reduced by the stress concentration arising from the matrix crack. Experimental measurements of the strength of a glass fibre embedded in a brittle matrix support the theory. The case of a fibre in a matrix of different elastic modulus is also considered, together with the proDlem of cracking along the fibre-matrix interface.

scholarly journals The Elastic Properties of Unidirectional Bamboo Fibre Reinforced Epoxy Composites

2019 ◽  
Vol 8 (3) ◽  
pp. 7187-7193
Keyword(s):  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Three Dimensional ◽  
Weight Ratio ◽  
Natural Fibre ◽  
Fibre Volume ◽  
Good Choice ◽  
Fibre Reinforcement ◽  
Bamboo Fibre ◽  
Structural Applications

Natural fibres such as kenaf, jute, bamboo, flax and wood have been the subject of intensive researches in the area of fibre reinforced composite due to their environmental advantages of being renewable, biodegradable and sustainable. Bamboo fibre can be a good choice of natural fibre reinforcement for structural applications due to its excellent strength to weight ratio that is comparable to that of mild steel. In this study, mechanical properties of both continuous and short bamboo fibre reinforced composites are predicted using micromechanical approaches. The finite element method was used where three-dimensional micromechanical representative volume element with square and hexagonal packing geometry was implemented. The results were then compared with the findings from analytical approach that includes the rule of mixture and the Halpin-Tsai model. It was found that for all properties, the FEM and analytical methods give comparable trends of property on volume fraction plots. Furthermore, the longitudinal modulus given by all models are in excellent agreement as it increases linearly with the increase in bamboo fibre volume fraction.

scholarly journals Review on Manufacture of Military Composite Helmet

2021 ◽  
Author(s):  
Yazhen Liang ◽  
Xiaogang Chen ◽  
Constantinos Soutis
Keyword(s):  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Structural Heterogeneity ◽  
Processing Parameters ◽  
Fibre Volume ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Protective Function ◽  
The Matrix ◽  
Manufacturing Technologies

AbstractDespite of the fact that more and more accessory devices are integrated to functionalize a ballistic helmet system, its core ballistic protective function needs to be improved with weight reduction was and still is the main course in engineering design. The two major generic classes of synthetic fibres for ballistic composites are Ultra High Molecular Weight Polyethylene (UHMWPE) fibre (0.97 g/cm3) and aramid fibre (1.44 g/cm3). In the area of military helmets, these fibres are constructed into different topologies, draping/forming into double-curvature geometric shape in multiple plies, serving as reinforcement for composite shell. The preforming ways influence the subsequent impregnation / solidification and curing step in manufacture, in terms of the fibre orientation and fibre volume fraction. The inherent structural heterogeneity thus leads to scatter in permeability and composite thickness, and have further impact in generating process-induced defects. During the processing, the fibre continuity without wrinkles, together with voids-free are determinative factors to a quality final part. The aim of this paper is to review the manufacturing technologies characterised by thermo-mechanical forming and Liquid Composite Moulding (LCM), relating their processing parameters respectively to the properties of reinforcements in one dimension (1D), two dimensions (2D) and three dimensions (3D), along with that of the matrix in dry or wet phase, interdependency of them are sought.

scholarly journals DAYA SERAP AIR DAN KANDUNGAN SERAT (FIBER CONTENT) KOMPOSIT POLIESTER TIDAK JENUH (UNSATURATED POLYESTER) BERPENGISI SERAT TANDAN KOSONG SAWIT DAN SELULOSA

2013 ◽  
Vol 2 (3) ◽  
pp. 17-21 ◽  
Author(s):  
Michael ◽  
Elmer Surya ◽  
Halimatuddahliana
Keyword(s):  
Water Absorption ◽  
Palm Oil ◽  
Volume Fraction ◽  
Unsaturated Polyester ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Cellulose Content ◽  
Content Increase ◽  
Empty Fruit Bunch ◽  
The Matrix

This study was aimed to investigate the effect of empty fruit bunch palm oil and cellulose content as filler in water absorption and fibre volume fraction of the unsaturated polyester composites. The composites were made by hand-lay up method by mixing unsaturated polyester with the composition of each fillers (empty fruit bunch palm oil and cellulose) of 5,10,15,20 wt%. The parameter which was carried on the prepared samples was water absorption for each sample every 24 hours until the composites have constant absorption. It was found that the addition of fillers to the matrix caused the water absorption of composites increased at each of composition of fillers (empty fruit bunch palm oil and cellulose) and the fibre volume fraction increased as the filler content increase.

Computational micromechanical modelling of the material removal process in a carbon fibre composite under single-erodent particle impact

2020 ◽  
Vol 234 (10) ◽  
pp. 1605-1617
Author(s):  
Ajaz A Deliwala ◽  
Chandra S Yerramalli
Keyword(s):  
Carbon Fibre ◽  
Volume Fraction ◽  
Matrix Material ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Erosion Behaviour ◽  
The Matrix ◽  
Material Erosion ◽  
Erodent Particle

A multiscale model is developed to understand the material removal process in a unidirectional carbon fibre epoxy composite impacted by a single-erodent particle. The embedded cell approach is used to model the carbon fibre and epoxy at a microscale. The micromodel is embedded centrally in the macroscale lamina of the composite plate. The carbon fibre is considered to be elastic with orthotropic strain limits as the failure criteria. The epoxy matrix is modelled as an elastic--plastic material with multilinear isotropic hardening. The maximum equivalent plastic strain limit is used as the matrix material failure limit. Using this embedded micromechanics model, the role of matrix and the fibre in developing the composite material erosion behaviour has been clearly elucidated. The results from the simulation indicate the change in the matrix erosion behaviour as a function of the fibre volume fraction. For the current thermoset matrix, material erosion response changes from brittle behaviour to ductile behaviour with an increase in fibre volume fraction. The current study has been able to highlight the individual role of matrix and the fibre in developing the semi-ductile erosion response peculiar to a fibre-reinforced composite material.

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