WS1e6 - SHEET FORMING SIMULATION BASED ON BARLAT'S PLANAR ANISOTROPIC YIELD CRITERION

Abstract

Modeling of sheet metal forming processes requires an accurate description of anisotropic material behavior. However, the majority of FEM simulations still assume isotropy, even though sheet metals usually show anisotropic properties after they are fabricated by thermo-mechanical processes. There have been some efforts to include anisotropy, but most of them are limited to planar isotropy (equivalently,“through-thickness anisotropy”), and the efforts to include planar anisotropy are still rare. This paper describes the finite element (FEM) simulation results obtained using Barlat's six-component anisotropic yield function, developed recently. A cup drawing test was modeled for a 2008-T4 aluminum alloy, using this new yield function incorporated into ABAQUS. Good agreement was found between the FEM simulation and the experiment. The result shows that a better mathematic tool is now available which can be used to enhance the forming simulation of planar anisotropic metals.