高低温サイクル疲労の切欠き効果に及ぼすひずみ保持時間の影響 : ASMEコードケースN-47とノイバー則の評価を含めて

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The hold-time effect on notch sensitivity in low-cycle fatigue life was studied at 600℃ in air by using austenitic stainless steel SUS 316. The total strain controlled tests with the hold-time t_H from 10 min. to 60 min. were performed by use of the round notched specimens with the stress concentration factor K_t of 2. 6, 4. 2 and 6.0. From the tests, the following conclusions were obtained. The number of cycles to failure of the notched specimen decreased with an increase of t_H. But the rate of decrease in fatigue life with an increase of t_H was the most at t_H of 10 min. and at a longer hold-time the life was almost constant. Particularly, for the case of K_t of 2. 6 the fatigue life increased slightly with an increase of t_H in connection with notch-strengthening of the metal tested. Also, the life prediction method of " Modified both frequency ,ν and K_t fatigue life rule " of N_f=N_<fo>K^m_tν^l, was applicable in order to predict accurately the life of a notched specimen at any condition of K_t and t_H. The life prediction rule which corresponds to ASME Biler & Pressure Vessel Code Case N-47 was evaluated and the prediction was found inaccurate in comparison with that mentioned above. Furthermore, Neuber's rule was examined from the elasto-plastic solution for a semi-infinite plate with a semi-elliptic notch under anti-plane shear and the modified rule of K^b_t=K_σK_ε was found applicable to the prediction in creep-fatigue interaction, where b takes the numerical value from 1 to 2.
社団法人日本材料学会の論文
1981-09-15

高低温サイクル疲労の切欠き効果に及ぼすひずみ保持時間の影響 : ASMEコードケースN-47とノイバー則の評価を含めて

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