FINITE-ELEMENT SIMULATIONS OF EARING IN POLYCRYSTALLINE MATERIALS USING A TEXTURE-ADJUSTED STRAIN-RATE POTENTIAL

A subroutine has been written that describes the plastic behavior of a material by a strain-rate potential and its associated normality rule. A recent method to fit an analytical potential to the crystallographic one has been used, which allows us to obtain its coefficients directly from the texture coefficients of the material. The subroutine, based on a fourth-order potential, has been implemented in ABAQUS and simple finite-element simulations of deep drawing have been performed. The use of the dual potential does not increase drastically the computing time; moreover, the selected potential reproduces most of the anisotropic features of the tested Al alloy and mild steel and can also predict six ears for particular textures; finally, the predicted ear profiles are of a reasonable order of magnitude compared to some experimental values determined on similar alloys.