Application of the Radial Return Method to Compute Stress Increments From Mroz’s Hardening Rule

Abstract

Abstract It is well known in the literature that the isotropic hardening rule in plasticity is not realistic for handling plastic deformation in a simulation of a full sheet metal forming process including springback. An anisotropic hardening rule proposed by Mroz is more realistic. For an accurate computation of the stress increment for a given strain increment by using Mroz’s rule, the conventional sub-interval integration takes excessive computing time. This paper proposes the radial return method to compute such stress increment for saving computing time. Two numerical examples show the efficiency of the proposed method. Even for a sheet model with more than 10000 thin shell elements, the radial return method takes only 40% of the overall computing time by the sub-interval integration.