Anisotropic plasticity model coupled with strain dependent plastic strain and stress ratios

作者：Volk Wolfram^*; Kim Jae Kun; Suh Joungsik; Hoffmann Hartmut

来源：CIRP Annals - Manufacturing Technology, 2013, 62(1): 283-286.

DOI：10.1016/j.cirp.2013.03.055

• Metal forming
• Anisotropy
• Finite element method (FEM)

It is necessary to describe properly anisotropic material behavior for realistic numerical analyses of sheet metal forming processes. The implementation of many yield criteria in finite element analysis is very complicated. Various material tests are also required to determine yield function coefficients. Stress ratios and anisotropy coefficients are not constant during forming processes due to deformation induced anisotropy. This paper introduces a yield function using strain dependent plastic strain ratios and stress ratios. The main advantage is to fully utilize the data of uniaxial tensile tests. The described material behavior shows a significantly improved agreement with experimental data.

• 出版日期2013