545 脆性材料の破壊挙動に及ぼす微視き裂の影響

概要

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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 containing initial cracks were numerically simulated. The mean stress model was adopted as the condition of the initiation of micro-cracks. The micro-cracks were located in a regular manner as the bonds of a square lattice. The critical strength of the bond was given as random variables. When the initial crack length was small, the calculated relationship between the applied strain and the stress became linear. Variance of the critical strength of micro-crack initiation had significant effect to the linearity. The fracture strength decreased with increasing the size of the initial crack. 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. As the variance of the critical strength increased, the increasing rate of the resistance curve became large.
社団法人日本機械学会の論文
2002-09-20