Abstract
This study evaluates the material dependence on multiaxial low cycle fatigue in order to develop a suitable strain parameter for life prediction under non-proportional loading. Strain controlled multiaxial low cycle fatigue tests under 2 types of proportional and non-proportional loadings were carried out using SUS316NG and SGV410 hollow cylinder specimens at room temperature. The reduction in low cycle fatigue life due to non-proportional loading is discussed by connecting with an additional hardening and crack initiation and propagation behaviors. Fatigue lives decrease down to 1/5 due to non-proportional loading for SUS316NG and SGV410 steels, but degrees of additional hardening are different.
