粒子分散複合材料におけるはく離損傷および粒子寸法効果を考慮した微視力学モデル

抄録

This paper deals with a micromechanics model of particle-reinforced composites which can describe debonding damage of particles-matrix interface, matrix plasticity and particle size effect on deformation and damage. The Tohgo-Chou-Weng's incremental damage theory of particle-reinforced composites based on the Eshelby's equivalent inclusion method and Mori-Tanaka's mean field concept has been extended to consider the particle size effect by using the Nan-Clarke's simple method. The particle size effect on deformation is realized by introducing dislocation plasticity for stress-strain relation of in-situ matrix in composites, and the particle size effect on damage is described by a strain energy release rate criterion for particle-matrix interfacial debonding. Furthermore, for the composites containing particles of various sizes, the effect of a particle size distribution is incorporated into the model. Influence of the debonding damage and particle size on the stress-strain response of composites is discussed based on numerical results by the proposed model.