A General Orthotropic von Mises Plasticity Material Model With Mixed Hardening: Model Definition and Implicit Stress Integration Procedure

[+] Author and Article Information
M. Kojić, N. Grujović, R. Slavković, M. Živković

University of Kragujevac, UI. S. Janjic 6 34000 Kragujevac, Serbia, Yugoslavia

J. Appl. Mech 63(2), 376-382 (Jun 01, 1996) (7 pages) doi:10.1115/1.2788875 History: Revised August 08, 1994; Revised April 19, 1995; Online October 26, 2007


A general orthotropic von Mises plasticity model, with an extension of the Hill’s yield criterion to include mixed hardening, is introduced in the paper. Material constants and equivalent stress-equivalent plastic strain curves are defined in a way to suggest their experimental determination. The model represents a special case of a general anisotropic metal plasticity model proposed by the authors. An implicit stress integration procedure, representing an application of the governing parameter method (GPM) introduced by the first author, is presented. The GPM is briefly described, and the computational procedure, together with calculation of the consistent tangent moduli, are given in some detail for a general three-dimensional deformation, with direction of application to plane stress/shell conditions. Numerical examples illustrate applicability of the model and effectiveness of the computational algorithm.

Copyright © 1996 by The American Society of Mechanical Engineers
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