Abstract
A microstructural-overall two-level elastoplastic and damage model is proposed to predict the overall mechanical behavior of particle-reinforced metal matrix composites. Unidirectionally aligned spheroidal elastic particles, some of which are partially debonded from the matrix, are randomly distributed in the ductile medium. These imperfect particles are modeled by fictitious orthotropic inclusions without debonding. An ensemble-volume averaged homogenization procedure is employed to estimate the effective yield function of the said composites. The associative plastic flow rule and the hardening law are postulated based on the continuum plasticity theory. The evolution of volume fraction of debonding particles is considered in accordance with Weibull’s statistical function to characterize the varying probability of reinforcement debonding. The uniaxial elastoplastic stress–strain behavior of particle composites is investigated as the first application. In particular, comparisons between the proposed uniaxial stress–strain predictions and experimental data are performed to illustrate the capability of the proposed method. Furthermore, the effect of stress triaxiality is discussed under either the purely hydrostatic or axisymmetric loading on the overall elastoplastic behavior of composites.
Published Version
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