金属の疲労破壞の統計的性質

概要

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The previously reported data concerning two kinds of steel at three different stress ranges have been analysed. The number of specimens used was about seventy to hundred per stress range. The analysis used the method of plotting for the survivorship function proposed by Gumbel and independently by Weibull. When fatigue fracture is regarded as a problem of stochastic process, the survivorship function, p, is approximately given by the form : p exp (-NAS^γ) where A and γ are constants. The apparent incubation interval of repeated cycles is considered to correspond to the actual incubation interval during which dislocations pile up at obstacles, and to the apparent incubation interval which the micro-crack or crack nucleus takes in order to grow up to the macro-crack or lead to rupture of the whole specimen.
宇宙航空研究開発機構の論文
1954-03-15