FINITE-ELEMENT SIMULATION OF V-DIE BENDING - A COMPARISON WITH EXPERIMENTAL RESULTS

A major problem in sheet bending is to compensate for springback. Anal ytical descriptions are not sufficiently general to accommodate influe nces from the material and the geometry due to the simplifications tha t have to be made. Practical experiments are still needed to be able t o compensate for springback. The aim of this work has been to lest the finite-element method on its abilities to predict springback for free bending in a V-die. The work shows that the finite-element method can be used to predict springback off-line. The true stress-true strain c urve from a tensile test is used as the material description. Springba ck has been studied for eight different materials of varying thickness . The process has been simulated with the code Nike2d and the results from the simulations compared with those from experiments, good correl ation between the simulations and the experiments being achieved. (C) 1997 Elsevier Science S.A.