Abstract
A new hypothesis for formation of non-propagating cracks at fatigue of metals is proposed. The hypothesis is based on coaxing effect and strain hardening effect and others, which the related material receives at the tip of a fatigue crack. Due to these effects, the material at the tip of fatigue crack is considered to be stronger at inner parts than at near surface. The fatigue strength for formation of cracks and that for destruction are considered. A critical value of the fatigue strength reduction factor, which means the minimum value of it for formation of non-propagating crack, is also considered. The relation between the critical fatigue strength reduction factor and the fatigue strength of two kinds above mentioned is obtained from the hypothesis proposed. The reduced relations is compared with the results of experiments made on rotating bending and repeated torsion, and good agreement is noticed.
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