Effect of hardening rule on springback prediction for an open-channel shaped part of dp600 steel

The material parameters of Chaboche nonlinear isotropic/kinematic hardening rule were identified based on the stress-stain curve of DP600 and Hill´48 yielding criterion. A FEM model was established in ABAQUS to investigate effect of different hardening rules on springback prediction for an open-channel shaped part. According to the FEM results, the prediction based on Chaboche nonlinear isotropic/kinematic hardening rule is consistent with the experimental data, while isotropic hardening rule makes imprecise prediction. This is because internal stress and moment of the part after forming are over-estimated when neglecting the Bauschinger effect.