Bodner-Partom Constitutive Model and Nonlinear Finite Element Analysis

[+] Author and Article Information
F. A. Kolkailah

California Polytechnic State University, San Luis Obispo, CA 93407

A. J. McPhate

Louisiana State University, Baton Rouge, LA 70803

J. Eng. Mater. Technol 112(3), 287-291 (Jul 01, 1990) (5 pages) doi:10.1115/1.2903325 History: Received April 20, 1989; Online April 29, 2008


In this paper, results from an elastic-plastic finite-element model incorporating the Bodner-Partom model of nonlinear time-dependent material behavior are presented. The parameters in the constitutive model are computed from a leastsquare fit to experimental data obtained from uniaxial stress-strain and creep tests at 650°C. The finite element model of a double-notched specimen is employed to determine the value of the elastic-plastic strain and is compared to experimental data. The constitutive model parameters evaluated in this paper are found to be in good agreement with those obtained by the other investigators. However, the parameters determined by the numerical technique tend to give response that agree with the data better than do graphically determined parameters previously used. The calculated elastic-plastic strain from the model agreed well with the experimental strain.

Copyright © 1990 by The American Society of Mechanical Engineers
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