Fatigue limit estimation of stainless steels with new dissipated energy data analysis

Abstract

In this paper, a new fatigue limit estimation scheme for austenitic stainless steel based on the dissipated energy is proposed. The new scheme utilizes the phase 2f lock-in infrared method which is a technique for improving the accuracy of a dissipated energy measurement, and evaluates the fatigue limit based on the increasing rate of dissipated energy. This scheme is applied to the pre-strained austenitic stainless steel specimen. The fatigue limit of austenitic stainless steel specimen is increased by the plastic forming process. The phase 2f lock-in infrared method can remove the apparent dissipated energy which is caused by thermoelastic temperature change due to harmonic vibration of fatigue testing machine. The estimation scheme based on the increasing rate of dissipated energy against the stress level can evaluate the fatigue limit of the pre-strained specimen with greater accuracy than the conventional scheme.