半だ円延性表面き裂進展挙動の評価 : き裂アスペクト比の簡易的予測

概要

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Finite element analyses are performed on the assumption of the power-law hardening and the deformation theory of plasticity. The J-integral values under the fully plastic condition are estimated for four semi-elliptical. The J-integral values under the fully plastic condition are estimated for four semi-elliptical surface cracks in a plate subjected to uniform tension. Both local and global estimations are employed, varying the manner of the virtual crack extension. Some discussions are made on the J-integral distribution along the crack front. Especially for a deep crack, the maximum J-integral value is found at some location between the deepest point and the free surface. Also, the numerical solutions are applied to the experimental results obtained by the multi-specimen method. The crack aspect rations during ductile growth are predicted well with reasonable fracture resistance.
一般社団法人日本機械学会の論文
1987-06-25