Development of bending limit strain and stress curves of bendability prediction for assembling automotive body panels

In the automobile industry, bending and hemming processes are normally used to supplement car body panels. However, Forming Limit Curve (FLC) inappropriately induces predict bendability in process as it has a different failure mechanism deformed sheet metals can undergo greater than predicted by FLC. this work, newly developed Bending (BLC) based on strain stress were experimentally numerically proposed for prediction tools of assembling automotive For experimental procedures, BLC dual phase steel grade DP590 with thickness 1.0 mm was determined simulative tests. Firstly, various sample geometries pre-stretched using modified Marciniak in-plane stretch-forming tests realistic reflection stamping before process. Afterwards, establish BLC, samples conducted three-point test. Moreover, influence radius 0.4 2.0 investigated both BLCs Stress Curves (BLSCs). The obtained BLSCs plastically calculated data corresponding punch plate radii, which coupled anisotropic yield criteria namely, Hill’48 Yld2000-2d Swift hardening model. It found that exhibited level Obviously, higher established lower BLSC, respectively. have similar trend their curves same criterion. conclusion, completely accomplished realistically not sensitive non-linear paths establishes