混合モード荷重下のき裂先端近傍における空孔の成長解析

概要

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A large deformation finite element analysis has been performed to study the near crack tip growth of a long circular cylindrical hole aligned parallel to the crack plane under mixed mode conditions. The effect of microvoids is taken into account by employing Gurson's constitutive equation. Under the mixed mode condition, one corner of the crack tip sharpens while the other corner becomes blunt. A hole near the sharpened corner flattens without growing and hardly effects the crack tip deformation and distribution of the microvoid volume fraction. However, a hole near the blunted corner grows rapidly and changes its shape to an approximately elliptical cylinder under a strong interaction between the crack and the hole. The strain and the void volume fraction of microvoids became concentrated in the ligament between the crack tip and the hole. Unloaded regions also appear near the tip and the deformation of the near crack tip region is rather involved.
一般社団法人日本機械学会の論文
1989-04-25