Influence of process and material parameters on the twist springback prediction of a panel

Abstract Both advanced high strength steels and aluminum alloys gained increasing popularity because of the constant effort to meet social pressure reducing vehicle weight while keeping their safety. The ratio between material is much higher when compared other materials but, springback after forming one disadvantages these materials, particularly exhibiting twisting side wall curl, which are two most difficult types control compensate in die engineering. This study analysis influence several numerical parameters on prediction twist springback, using Twist Die. Two processing conditions were considered: (i) blank-holder force that constrains metal flow (ii) a stake bead, changes from draw stretch forming, at end process. modelling elastoplastic behavior sheet uses wide range experimental data, for DP980 steel 6xxx alloy. In addition effect following also analyzed numerically: friction coefficient; beads; (iii) modulus elasticity; (iv) work hardening law (v) yield criterion. All simulations performed with finite element in-house code DD3IMP. process parameter affects presence significantly springback. addition, reduction coefficient elastic leads an increase On hand, criterion has little this component. shows different trend alloy seems be related but distinct gap punch die.