Abstract
The fatigue life expressed as an S-N curve exhibits quite a large difference depending on the type of loading ; cyclic bending fatigue life is larger than the push-pull fatigue life. This is mainly caused by the difference in cyclic deformation occurring under two loading conditions. The present authors aimed to estimate the cyclic strain and the life in cyclic bending fatigue, based on the results of push-pull loading in JIS S45C steel. The cyclic softening occurring in cyclic bending fatigue was successfully analyzed by introducing the simplified push-pull cyclic softening behavior into the numerical elastic-plastic calculation, and the difference in cyclic deformation between the two types of loading was quantitatively clarified. Furthermore, the fatigue life curve under cyclic bending load was satisfactorily estimated by combining the push-pull fatigue life curve and the above calculated cyclic strains.
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