Algorithmic Formulations of Evolutionary Anisotropic Plasticity Models Based on Non-Associated Flow Rule

Abstract In the present paper, orthotropic elasto-plastic constitutive formulations for sheet metal forming based on non-associated flow rule that assume distortion of yield function/plastic potential with ongoing deformation process are analyzed. The yield function/plastic potential are considered as two different functions with functional form as orthotropic quadratic Hill or non-quadratic Karafillis-Boyce stress function. Based on the principle of plastic work equivalence, anisotropy parameters of the utilized yield function/plastic potential are set as functions of the equivalent plastic s...