界面き裂の弾塑性有限要素解析

概要

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An elastic-plastic finite strain/finite-element analysis was performed on a crack on a bimaterial interface to provide insight as to initiation of ductile fracture. The materials lying above and below the interface are taken to be different from each other in yield stress or in strain hardening exponent. Gurson's constitutive equation was employed in order to take account of the effect of void nucleation and growth on the near crack tip fields. The results are as follows: (1) There exists a singular field akin to the HRR field, and the j-integral can be an effective fracture mechanics parameter for an interfacial crack. (2) The microvoids give a larger effects on the stress and strain fields in the immediate vicinity of the crack tip than for a homogeneous material. (3) The plastic strain and microvoid volume fraction localize in a narrow band which grows into the softer material from the intersection of the interface and the periphery of the blunted crack tip at an inclination of about 15-45 degrees.
一般社団法人日本機械学会の論文
1990-03-25