A Nonlinear Kinematic Hardening Model for Elastoplastic Deformations in Grey Cast Iron

[+] Author and Article Information
B. L. Josefson, H. E. Hjelm

Division of Solid Mechanics, Chalmers University of Technology, S-412 96 Göteborg, Sweden

U. Stigh

Department of Engineering Science, Högskolan i Skövde, Box 408, S-541 28 Skövde, Sweden

J. Eng. Mater. Technol 117(2), 145-150 (Apr 01, 1995) (6 pages) doi:10.1115/1.2804521 History: Received December 17, 1993; Revised August 06, 1994; Online November 27, 2007


A kinematic hardening model including an associated flow rule is proposed for elastoplastic deformations in graphitic grey cast iron. Quantitatively good results are obtained when comparing with previously performed biaxial experiments. Use of a nonassociated flow rule is found to result in an undesirable weakening behavior that can be explained as a deficiency with the combination of kinematic hardening and the present choice of yield potential. The model proposed is also extended to include multilinear kinematic hardening. With this model qualitatively good agreement with experimental cyclic results from the literature is obtained. A three-dimensional FE-analysis of a cylinder head for a heavy duty Diesel engine is performed as an application. To predict initiation of thermal fatigue cracks, it is essential to use an elastoplastic material model.

Copyright © 1995 by The American Society of Mechanical Engineers
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