抄録
The fatigue strength of metals is affected by various factors. Among them, the notch effect due to the stress concentration and the scale effect due to the scale of specimen are especially significant. Starting from the idea that the fatigue failure occurs when the mean stress over a certain depth from the surface reaches the fatigue strength of uniform specimen under alternating load of tension and compression, in this paper the author treated the notch and scale effects in a single formulation, where the depth is assumed to be a material constant independent of the shape and scale of specimen and the kind of load. Comparison with the available experimental results justifies this treatment.
