Numerical simulation of forming limit curves using reduced scale samples

Résumé

In this paper, a numerical simulation of an alternative solution to Haşek conventional method for forming limit curves determination is proposed. New types of samples, for the experimental research, were used, which dimensions are reduced three times in comparison with the conventional one. This numerical study was made with DYNAFORM software. The Belytschko-Lin-Tsay shell element based on a combined co-rotational and velocity-strain formulation was chosen to analyze the elasto-plastic process with complex geometrical nonlinearity. The geometrical modeling of the die-binder-blank-punch assembly request the calculations of the characteristic profiles of the working surfaces. A series of conclusions obtained from the numerical simulation of the forming limit curves using the new types of samples and a comparison with experimental one, are shown at the end.