REVIEW ARTICLES: Viscoplasticity: Experiment and Modelling

Steady-State and Transient Zener Parameters in Viscoplasticity: Drag Strength Versus Yield Strength

[+] Author and Article Information
A. D. Freed

NASA - Lewis Research Center, Cleveland, OH 44135

K. P. Walker

Engineering Science Software, Smithfield, RI 02917

Appl. Mech. Rev 43(5S), S328-S337 (May 01, 1990) doi:10.1115/1.3120836 History: Online April 30, 2009


A hypothesis is put forth which enables the viscoplastician to formulate a theory of viscoplasticity that reduces, in closed form, to the classical theory of creep. This hypothesis is applied to a variety of drag and yield strength models. Because of two theoretical restrictions that are a consequence of this hypothesis, three different yield strength models and one drag strength model are shown to be theoretically admissible. One of these yield strength models is selected as being the most appropriate representation for isotropic hardening.

Copyright © 1990 by American Society of Mechanical Engineers
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