110 粒子分散複合材料における粒子寸法効果とはく離損傷を考慮した有限要素解析とき裂先端場の評価(OS1-3 微視構造を有する材料の変形と破壊 : シミュレーション)

概要

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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.
2010-10-09