An Associated and Nonassociated Flow Rule Comparison for AISI 439-430TI Forming: Modeling and Experimental Analysis

Abstract The plastic anisotropy behavior of ferritic stainless steel (FSS) sheets was analyzed and modeled under associated nonassociated flow rule approaches. Three orthotropic functions, known as quadratic Hill48 nonquadratic (Yld2000-2d BBC2005), were developed employed an hypothesis. For the NAFR based on initial anisotropy, mechanical described by nonexponential model functions Yld2000-2d BBC2005 to predict directional dependence parameters. It provided a considerable advantage in terms flexibility good agreement with experiment. According results, polynomial fit transverse versus longitudinal true strain curve used describe designated properties corresponding selected level strain. To evolution anisotropic hardening potential hardening, seven different loading conditions considered. proposed evolutionary non-AFR criteria showed accuracy predicting yield Lankford coefficients depending deformation.