微視的き裂の挙動に基づくS20C焼なまし材の確率疲労特性の検討

概要

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Rotating bending fatigue tests of annealed 0.21% C steel plain specimens were carried out for three stress ranges. Sixteen to 18 specimens were fatigued at each stress range, and the behavior of cracks which led to the fracture of specimens was observed successively by the plastic replica method. The scatter characteristics of fatigue life were studied on the basis of the behavior of microcracks. The results show that the scatter in fatigue life is controlled mainly by that in N_<0.3>, 0.3mm crack initiation life. The coefficient of variation, CV, for N_<0.3> is especially large at stress right near the fatigue limit. On the other hand, the scatter in the propagation life from 0.3 mm up to fracture, N_<0.3→f>, is not so large. Significant dependence ofσa on CV for N_<0.3→f> is not observed.
一般社団法人日本機械学会の論文
1992-08-25