Influence of Material Models on the Accuracy of the Sheet Forming Simulation

Abstract

This article is devoted to a comprehensive testing of the advanced materials models as implemented in the finite-element code. The influence of the numbers of the mechanical parameters on the accuracy of the sheet metal forming simulation has been studied for two materials (DC 04 steel grade and Ac121-T4 aluminum alloys). The results presented in the article prove the ability of the BBC2005 yield criterion to provide an accurate description of the anisotropic behavior for both steel and aluminium alloys. The performances of the model have been evaluated using the experimental data obtained from cross-die benchmark tests. The results demonstrate that for an accurate prediction of the sheet metal forming simulation it is crucial to take not only the uniaxial yield stresses and r-values into account but also the biaxial yield stress.

Keywords:

• Advanced yield criteria
• Forming simulation
• Sheet metal

ACKNOWLEDGMENTS

DB's work was supported by the Romanian National University Research Council (CNCSIS), Program PCCE, Grant No. 6/2010.