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Effect of particle cracking on elastoplastic behaviour of metal matrix composites

✍ Scribed by L. Z. Sun; H. T. Liu; J. W. Ju

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
205 KB
Volume
56
Category
Article
ISSN
0029-5981

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✦ Synopsis

Abstract

A micromechanics‐based elastoplastic and damage constitutive model is proposed to predict the overall mechanical behaviour of particle‐reinforced metal matrix composites. Unidirectionally aligned spheroidal elastic particles, some of which contain penny‐shaped cracks, are randomly distributed in the elastoplastic metal matrix. These imperfect particles, attributed to progressive particle cracking, are modelled by using the double‐inclusion concept. An ensemble‐volume averaged homogenization procedure is employed to estimate the effective yield function of the damaged composites. The associative plastic flow rule and the hardening law are postulated based on the continuum plasticity theory. The underlying damage evolution of particles is considered in accordance with the Weibull's statistical function to characterize the varying probability of reinforcement cracking. The elastoplastic mechanical behaviour of particulate composites under uniaxial loading conditions is simulated and compared with available experimental results. Copyright © 2003 John Wiley & Sons, Ltd.

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