混合モード荷重下における延性き裂先端のすべり線場法による鈍化の解析

概要

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Crack tip blunting in ductile material was analyzed under a small-scale yielding subject to mixed mode loadings of Mode I and Mode Ii. The material was assumed to be an elastic perfectly-plastic solid with Poisson's ratio being 1/2. The slip line field for a sharp crack under mixed mode loading was first determined by means of elastic-plastic finite element analysis. It was shown that only one elastic sector exists in the vicinity of the crack tip differing from the possibility of the existence of two elastic sectors discussed by Gao. The result for the sharp crack obtained was used as the boundary condition for the analysis of crack tip blunting. The characteristic shape of the crack tip blunting was obtained, which is just like the tip of a Japanese sword. Also, the stress field was determined around the blunted crack tip.
一般社団法人日本機械学会の論文
1986-01-25