静的な荷重下における材料表面に生起した残留応力のその場測定

抄録

The formation of a compressive residual stress layer on surfaces improves the fatigue properties of steel. However, compressive residual stress relaxation occurs during the fatigue process, necessitating the examination of this behavior. Herein, an on-site residual stress measurement system that can measure the residual stress under various load conditions was built. The load was changed in a stepwise manner and the residual stress was measured at each step to investigate compressive residual stress relaxation during the early stages of the fatigue process. During first compressive loading process, serrated compressive residual stress changes were observed; it was greatly relaxed. This relaxation was caused by the stepwise local slip deformation in residual stress layer.