Modeling of Particle Debonding and Void Evolution in Particulated Ductile Composites

Abstract

Damage characteristic of particulated ductile composites is a complex evolutionary phenomenon that includes particle debonding and void evolution with the accumulation of the plastic straining of the ductile matrix. In this paper, a micromechanical elastoplastic damage model for ductile matrix composites considering gradually incremental damage (particle debonding and void evolution) is proposed to predict the overall elastoplastic behavior and damage evolution in the composites. The constitutive damage model proposed in an earlier work by the authors [Kim and Lee (2009)] considering particle debonding is extended to accommodate the gradually incremental damage and elastoplastic behavior of the composites. On the basis of the ensemble-averaged effective yield criterion, a micromechanical framework for predicting the effective elastoplastic damage behavior of ductile composites is derived in the present study. A series of numerical simulations including parametric tests are carried out to illustrate stress-strain response of the proposed micromechanical framework. Furthermore, comparisons between the present predictions and experimental data available in the literature are also made to illustrate and assess the predictive capability of the proposed model.