微視損傷の発生および連結に基づくぜい性材料の破壊解析

概要

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Numerical simulation method for analyzing the fracture behavior of brittle materials was developed on the basis of the initiation of micro-cracks. Deformation and fracture behavior of porous ceramics with initial cracks were numerically simulated. The mean stress model was abopted as the condition of the initiation and propagation of micro-cracks. The micro-cracks were located in a regular manner as the bonds of a square lattice. The stress distribution and stress intensity factors at micro-crack tips were calculated numerically by the body force method. As the variance of the critical strength increased, and as the initial crack length became long, the stress-strain relationship became nonlinear. When the initial crack length was small, the fracture occurred not from initial crack tip. The size of the non-damaging defects could be evaluated by the proposed method. The resistance curve calculated was independent of the initial crack length. The calculated results agreed very well with the experimental results.
社団法人日本機械学会の論文
2004-01-25