微視的き裂の発生と伝ぱに関する統計的性質 : 続報, S20C焼ならし平滑材の回転曲げ疲労

概要

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The statistical property of the fatigue behavior was investigated for normalized 0.21% carbon steel plain specimens. An emphasis is to investigate separately the statistical properties of the initiation and propagation of microcracks through successive observations of the specimen surface by the plastic replica method. Results show that the distributions of crack initiation life and microcrack propagation life are expressed as two- or three-parameter Weibull distributions. More-over, the three-parameter Weibull distribution is well fitted to the crack length distribution, and the value of the shape parameter m in this case decreases with an increase in the relative cycle ratio N / N_f. As the main reason for the decrease in m, we can point out the decrease in the number of newly initiated cracks at each N / N_f.
一般社団法人日本機械学会の論文
1990-01-25