[생산기술부문] 판재의 성형한계에 대한 변형경로 의존성에 대한 연구

This paper deals with the analytical study for predicting the path dependent forming limit for bilinear strain paths. To predict the forming limit diagram the analytical procedure was performed within the framework of Marciniak and Kuczynski approach by introducing the effect of the existence of strain gradient over the stretching punch. The predicted path dependent forming limit of anisotropic sheet was compared with experimental ones. It is found that the predicted path dependent forming limits are in good agreement with those experimental data.