Stress-Strain Curves under Variable Stresses

Abstract

Repeating plastic strain is an essential factor of fatigue phenomena. M. Kawamoto and K. Koibuchi have already reported "Hereditary method" concerning the estimation of fatigue lives under service load on the basis of plastic strain. Here, experiments of stress-strain curves under several variable stress sequences have been done and analysed by Hereditary method. And also, it has been tried to express these curves qualitatively, using a mechanical model consisting of springs and sliders.