繰返し荷重を受ける銅環状切欠部に生じる平均応力について

概要

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Circumferentially notched components of annealed copper were low-cycle fatigued under load-controlled condition being accompanied with mean load. In addition, their cyclic stress-strain responses were calculated under the corresponding loading conditions by means of elastic-plastic finite element method, where the constitutive equation proposed by the authors in their earlier paper was employed. The calculated nominal stress-diametral strain response at the minimum cross-section was in quite good agreement with the experiment, showing the validity of the present computation. The compressive mean stress generated at first one cycle at the notch-apex shakes down to be attenuated during the following cyclic loading under the condition of the load ratio R_p = -1.0, while this changes very slightly in the same direction during the further cyclic loadings at the R_p = -1/3 and 0. The stress ratio at the notch root R_σ is generally smaller than R_p, and the difference between them is much greater at R_p = -1/3 and 0 than at R_p = -1.0, in the sharper notch than in the duller notch, and under smaller applied cyclic loading than under the greater one. Incidentally, the tensile mean stress was yielded in the center region at the minimum cross-section of the notched components.
一般社団法人日本機械学会の論文
2003-02-25