Application of a Unified Constitutive Theory to the Nonproportional Multiaxial Strain Deformation of 1045 Steel

[+] Author and Article Information
J. A. Sherwood

Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824

E. M. Fay

Bird-Johnson Co., 110 Norfolk St., Walpole, MA 02081

J. Eng. Mater. Technol 114(2), 147-155 (Apr 01, 1992) (9 pages) doi:10.1115/1.2904154 History: Received February 01, 1991; Revised October 12, 1991; Online April 29, 2008


An automated procedure for the determination of the material constants in a constitutive equation which is used to model the multiaxial nonlinear material behavior of isotropic materials is discussed. The material model used in this research is a unified theory where the time-dependent strain (creep) and time-independent strain (plasticity) are treated as one (unified) inelastic strain. The flow equation considers the inelastic rate of strain and it is assumed that inelastic strain is present at all levels of stress. Application of the model to proportional and nonproportional biaxial loadings is presented.

Copyright © 1992 by The American Society of Mechanical Engineers
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