鋭い環状切欠部に生じた低サイクル疲労き裂の弾塑性破壊力学的解析と伝ぱ寿命予測

概要

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Elastic-plastic stress/strain analyses were performed for the circumferentially grooved component using the finite element method. The semielliptical surface crack originating at the notch root changes its shape, being influenced by the stress/strain gradients produced in the cross section of the notched component. Such a change in the shape of the surface crack was successfully analyzed in terms of the elastic-plastic fracture mechanics. The transition from the semielliptical to circumferential crack, which occurred in the process of the crack extension at the notch root, was also satisfactorily predicted in the present analysis. The number of cycles required for the semielliptical crack to reach the circumferential crack and for the circumferential crack to grow to the final failure were estimated through the proposed elastic-plastic fracture mechanics approach. The calculations were in quite good agreement with the test data.
一般社団法人日本機械学会の論文
1990-07-25