Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 26, 2022 - September 28, 2022
In order to improve fatigue properties of metallic materials, mechanical surface modification such as shot peening is one of powerful methods. Major key parameters of the material properties on the improvement are work hardening and introduction of compressive residual stress. In the case of measurement by using an indentation test, hardness which relates resistance on plasticity such as yield stress is evaluated, and residual stress is also affected by residual stress. Namely, elastic properties such as compressive residual stress can be measured by the indention test as well as material flow stress characteristic of the transition from elastic to plastic deformation. In the present paper, an evaluation method of elastic and plastic properties of mechanical surface modified layer by the indentation test was proposed. In view point of practical application, as the indentation test which was similar to Rockwell superficial hardness was useful, the ratio of preliminary minor load and additional major load was investigated.
