변형률 속도에 따른 인장/압축 경화 거동의 근사를 위한 수정 Two-surface 모델

Abstract

This paper suggests a modified two-surface model to describe the tension/compression hardening curves of auto-body steel sheets with the variation of the strain rate. Tension/compression tests of auto-body steel sheets were carried out by utilizing the simple clamping device developed by Bae et al. [~] in order to obtain tension/compression hardening curves. To consider the strain rate effect on the hardening behavior, a gap function used for the two-surface model was modified by inserting the strain rate hardening term. The approximation results show that the modified two-surface model can accurately describe the tension/compression hardening behavior with the variation of the strain rate.