Data-driven estimation of plastic properties in work-hardening model combining power-law and linear hardening using instrumented indentation test

In this study, a method for determining the additional material constant in a modified work-hardening model combining power-law and linear hardening was proposed without additional experimental data, based on the two stress--plastic strain curves of the power-law and linear hardening models. Consequently, the material constants can be determined using an existing approach. In this study, a data-driven estimation approach using the response surfaces of the loading curvature of a load--depth curve and the pile-up height of an indentation impression is established. The proposed approach was applied to high-work-hardening steel for validation.