Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 313, Issue 1-2, Pages 34-45Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)01144-3
Keywords
particle-reinforced metal-matrix composite; finite element modelling; microstructure; elastic-plastic mechanical properties
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A multi-particle 2D finite element model of a 20% particulate reinforced metal-matrix composite was developed on a statistical basis faking into account the correlations between the position, size and orientation of the ceramic particles in the matrix. The stress-strain curves in tension and compression given by the clustered multi-particle model are compared with the curves obtained from one-particle unit cell simulations. It is shown that clustering of particles increases the plastic strain accumulated in the matrix leading to a higher strain hardening and thus to a higher flow stress. The size of the representative volume element (RVE) should be at least equal to the correlation length of the geometrically relevant correlation functions, which was similar to 2.4 times larger than the average interparticle distance for the experimentally studied case. Reasonable agreement is obtained between computed residual strains and data available in the literature. (C) 2001 Elsevier Science B.V. All rights reserved.
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