Constitutive model of plasticity in finite deformation

An elastoplastic constitutive model for large strains is proposed using three kinds of equi-plastic strain surfaces, a yield surface and two other surfaces from which the power law for stress-strain relation is confined. The prediction by the model gives no oscillatory stress in simple shear, even though the Jaumann stress rate is utilized. Torsion with free- and fixed end conditions are also predicted by the model, which shows good agreement with experimental results of SUS 304. (C) 1999 Elsevier Science Ltd. All rights reserved.