Prediction of Propagation and Nonpropagation of Short Fatigue Cracks at Notches Under Mean Stresses

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概要

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• A resistance-curve method was proposed for predicting the growth threshold of short fatigue cracks emanating from the notch root under an arbitrary stress ratio. The resistance-curve was determined from the experimental result obtained from the fatigue tests of single-edge-notched plates of low-carbon steel under several stress ratios. The relation between the crack opening stress intensity factor at threshold, K_<opth>, and the nonpropagating crack length, c_<np>, was approximated by K_<opth>=K_<opth∞> [nemerical formula] c_1≤c_<np>≤c_2 K_<opth>=K_<opth∞> c_2≤c_<np>,where K_<opth∞> was the value for long cracks, c_2 was a linear function of K_<opth∞>, and c_1 was constant. Under compressive mean stresses, the effect of notch plasticity on crack closure was superposed on the above-mentioned closure. Good agreement between prediction and experiment was obtained for the fatigue limit for fracture and the nonpropagating crack length. The fatigue limit for crack initiation of a Stage II crack was almost constant and equal to the value predicted for the case of R = -1.

• 一般社団法人日本機械学会の論文
• 1990-07-15

著者

• Akiniwa Yoshiaki

  Faculty Of Engineering Kyushu Institute Of Technology

• TANAKA Keisuke

  Faculty of Engineering, Nagoya University

• TANIGUCHI Naomasa

  Asahi Glass Co. Ltd.

• Tanaka Keisuke

  Faculty Of Engineering Kyoto University

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