Yield Strength induced by Cyclic Loading

Abstract

The handling of the yield strength by cyclic loading becomes a problem, when the metal fatigue is examined from the initial stage. There is an example of making the stress in proportion to the strain of 0.2% on cyclic stress strain curve to be the cyclic yield strength. This time, the validity of the fact is not described, though the similar handling has been done without asking ductility and brittleness of the material. It is whether yield strength elongation by the tension load happens under cyclic loading, and it seems to determine the propriety of the fact. It seems to determine the propriety of the fact by whether yield strength elongation by the tension load occurs under cyclic loading or not. The handling method of the cyclic yield strength is determined, if this problem clears, and in addition, it seems to be useful for the investigation of the fatigue phenomenon in the initial stage. Here, it is tried to obtain cyclic stress strain curve by the constructed measurement system.