Abstract
Rotating bending and push-pull fatigue tests in a low cycle region were carried out with plain and notched specimens of machine structural steels. Fatigue strength and cyclic strain amplitude at the surface of the specimen under the above applied stress were compared with each other. In addition, the notch effect on rotating bending fatigue properties under low cycle fatigue were investigated. The conclusions are summarized as follows; (1) In the case of expression by nominal stress, which is usually used, rotating bending fatigue strength is remarkably higher than push-pull. This is because the cyclic strain amplitude at the surface of the specimen under rotating bending is considerably smaller than the push-pull one. (2) It is found that the fatigue strength of both applied stress types shows good agreement by re-arranging the cyclic strain amplitude at the surface of the specimens. (3) Low cycle fatigue strength of notched specimens under rotating bending can be also arranged with plan specmens by re-arranging the cyclic strain amplitude at the notch bottom surface of notched specimens.
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