抄録
This study deals with an analysis of a crack-tip field of particulate-reinforced composites which can describe the evolution of debonding damage, matrix plasticity and particle size effect on deformation and damage. Numerical analysis was carried out on a crack-tip field in elastic-plastic matrix composites reinforced with elastic particles. The particle size effect on dcformation is realized by introducing dislocation plasticity for stress-strain relation of in situ matrix in composites using the Nan-Clarke's simple method, and the particle size effect on damage is described by a critical energy criterion for particle-matrix interfacial debonding. The stress distribution ahead of the crack-tip field shifts upward with decreasing particle size. The debonding damage initiates from a crack tip and progresses ahead of the crack-tip. The larger the particle size is, the larger the damage zone is. The stress distribution shifts downward in the progressive damage zone.
