室内空気中および乾燥空気中における炭素鋼S38Cの耐久限度付近における確率疲労特性(<小特集>粉体小特集)

概要

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The statistical fatigue tests were carried out on S38C steel specimens in two environments by using two sets of rotating bending machines, each capable of testing ten specimens at the same time. One environment was an uncontrolled room atmosphere and the other was a dry atmosphere where the relative humidity at 21℃ was reduced to about one percent. Fifty specimens were equally allocated to each stress level, covering the failure probabilities from zero to 100 percent. From the experimental results, Weibull three parameters were evaluated by maximizing the correlation coefficient, and their stress dependence was inveatigated. Moreover, the beta distribution was used to approximate the distribution of endurance limit and good agreement was obtained throughout the failure probabilities from zero to unity for both environments. The effect of the reduction of humidity was distinct: the fatigue life as well as the endurance limit were improved in a dry atmosphere.
社団法人日本材料学会の論文
1987-11-15