A micromechanical analysis of a local failure criterion for particle-reinforced composites (original) (raw)
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Particle shape influence on elastic-plastic behaviour of particle-reinforced composites
Archives of materials science and engineering, 2014
Particle-reinforced composite materials very often provide unique and versatile properties. Modelling and prediction of effective heterogeneous material behaviour is a complex problem. However it is possible to estimate an influence of microstructure properties on effective macro material properties. Mentioned multi-scale approach can lead to better understanding of particle-reinforced composite behaviour. The paper is focused on prediction of an influence of particle shape on effective elastic properties, yield stress and stress distribution in particle-reinforced metal matrix composites. Design/methodology/approach: This research is based on usage of homogenization procedure connected with volume averaging of stress and strain values in RVE (Representative Volume Element). To create the RVE geometry Digimat-FE software is applied. Finite element method is applied to solve boundary value problem, in particular a commercial MSC.Marc software is used. Findings: Cylindrical particles provide the highest stiffness and yield stress while the lowest values of stiffness and yield stress are connected with spherical particles. On the other hand stress distribution in spherical particles is more uniform than in cylindrical and prismatic ones, which are more prone to an occurrence of stress concentration. Research limitations/implications: During this study simple, idealised geometries of the inclusions are considered, in particular sphere, prism and cylinder ones. Moreover, uniform size and uniform spatial distribution of the inclusions are taken into account. However in further work presented methodology can be applied to analysis of RVE that maps the real microstructure. Practical implications: Presented methodology can deal with an analysis of composite material with any inclusion shape. Predicting an effective composite material properties by analysis of material properties at microstructure level leads to better understanding and control of particle-reinforced composite materials behaviour. Originality/value: The paper in details presents in details an investigation of influence of inclusion shape on effective elastic-plastic material properties. In addition it describes the differences between stress distributions in composites with various inclusion shapes.
A micromechanics-based constitutive model for linear viscoelastic particle-reinforced composites
Mechanics of Materials, 2019
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Composites Part A: Applied Science and Manufacturing, 2008
A numerical method was used to study the interaction between a crack and the filler phase in a particle-reinforced polymer composite. The simulation was achieved by implementing a progressive damage-and-failure material model and element-removal technique through finite element analysis, providing a framework for the quantitative prediction of the deformation and fracture response of the composite. The effect of an interphase on composite toughness was also studied. Results show that a thin and high strength interphase results in efficient stress transfer between particle and matrix and causes the crack to deflect and propagate within the matrix. Alternatively, a thick and low strength interphase results in crack propagation within the interphase layer, and crack blunting. Further analysis of the effect of volume fraction and particleparticle interactions on fracture toughness as well as prediction of the fracture toughness can also be achieved within this framework.
Micromechanics for Particulate-Reinforced Composites
Mechanics of Advanced Materials and Structures, 1997
A set of micromechanics equations for the analysis of particulate reinforced composites is developed using the mechanics of materials approach. Simplified equations are used to compute homogenized or equivalent thermal and mechanical properties of particulate reinforced composites in terms of the properties of the constituent materials. The microstress equations are also presented here to decompose the applied stresses on the overall composite to the microstresses in the constituent materials. The properties of a "generic" particulate composite as well as those of a particle reinforced metal matrix composite are predicted and compared with other theories as well as some experimental data. The micromechanics predictions are in excellent agreement with the measured values. SYMBOLS C heat capacity E normal modulus G shear modulus K thermal conductivity Vf Volume fraction of particles quantities with tilde refer to particle cell tx coefficient of thermal expansion E strain v Poisson's ratio v density o stress Subscripts b binder p particles pc particulate composite 17. SECURITY CLASSIFICATION
Failures analysis of particle reinforced metal matrix composites by microstructure based models
Materials & Design, 2010
This paper discusses the methodology of microstructure based elastic–plastic finite element analysis of particle reinforced metal matrix composites. This model is used to predict the failure of two dimensional microstructure models under tensile loading conditions. A literature survey indicates that the major failure mechanism of particle reinforced metal matrix composites such as particle fracture, interfaces decohesion and matrix yielding is mainly dominated by the distribution of particles in the matrix. Hence, analyses were carried out on the microstructure of random and clustered particles to determine its effect on strength and failure mechanisms. The finite element analysis models were generated in ANSYS, using scanning electron microscope images. The percentage of major failures and stress–strain responses were predicted numerically for each microstructure. It is evident from the analysis that the clustering nature of particles in the matrix dominates the failure modes of particle reinforced metal matrix composites.
Composites Science and Technology, 2004
The effect of particle clustering on the effective response and damage evolution in particle reinforced Al/SiC composites is studied numerically and analytically. A probability of material failure is determined on the basis of the model of a composite as an array of subdomains, and with the use of the probabilistic analysis of failure of matrix ligaments between particles. It was found that the clustered particle arrangement leads to the three times higher probability of specimen failure than the random uniform particle arrangement. Mesomechanical finite element simulations of damage evolution in the composite with clustered and uniform particle arrangements, and different amounts, sizes and volume contents of SiC particles have been carried out. Tensile stress-strain curves and the fraction of failed particles plotted versus the applied far-field strain curves were determined numerically for all the microstructures. It was shown that the failure stress of composites increases with increasing the average nearest-neighbor distance between the particles in the composite, and with decreasing the degree of clustering of particles.
Elastic modulus and interface stress constraint of particle-reinforced composites
Materials Science and Engineering: A, 1993
A theoretical investigation was carried out of the role of particle-reinforced composites. A model is proposed which describes the deformation behavior of materials based on shear stress constraint and the strain compatibility at the interface of a spherical particle in a cuboid. The model is derived from stress analysis and calculation methods combining series and parallel models with an integral method. Using this method, the elastic properties of composites reinforced with spherical particles can be expressed analytically. Good agreement with experimental data was obtained for AI/SiC, SiC/ AI, WC/Co and Co/WC particle-reinforced composites. The constraining effect of shear stress at the interface is also discussed in this model.
Experimental and numerical study of the micro-mechanical failure in composites
The fibre/matrix interfacial debonding is found to be the first microscale failure mechanism leading to subsequent macroscale transverse cracks in composite materials under tensile load. In this paper, the micromechanical interface failure in fiber-reinforced composites is studied experimentally and by numerical modeling by means of the finite element analysis. Two fibers embedded in the matrix are subjected to a remote transverse tensile load (see Fig. 1a). The trapezoidal cohesive zone model proposed by Tvergaard and Hutchinson [14] is used to model the fracture of the fiber-matrix interfaces. This study is based on the comparison between the results of numerical modeling and those corresponding to the experimental tests by employing two parameters: The angle from the load direction to the crack tip and the crack normal opening. This comparison aims to investigate the interfacial properties and also assess the progressive fiber-matrix debonding by focusing on the interaction of two fibers with dissimilar interfacial strengths.
Journal of Materials Processing Technology, 2008
This paper reports microstructure-based finite element analysis of particle-reinforced metal–matrix composite (PRMMC) to evaluate the stress–strain and failure behavior. The optimization of properties was carried out from analysis of microstructure of MMC since the properties depend on particles arrangement in microstructure. The microstructure with random particle arrangement and particle clusters were analysed. In order to model the microstructure for finite element analysis (FEA), the microstructures were converted into equivalent CAD file format. The FEA meshes were generated on the CAD model in ANSYS 7. The failures such as particle fracture, interface decohesion and matrix yielding were predicted for particle clustered and non-clustered microstructures. The effects of particles arrangement on the failure mechanisms were analysed.