A Thermo-Viscoplastic Constitutive Equation Based on Hyperbolic-Shape Thermo-Activated Barriers

[+] Author and Article Information
Li-Lih Wang

Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui, The People’s Republic of China

J. Eng. Mater. Technol 106(4), 331-336 (Oct 01, 1984) (6 pages) doi:10.1115/1.3225726 History: Received December 21, 1983; Revised May 22, 1984; Online September 15, 2009


A thermo-viscoplastic constitutive equation is proposed on the basis of thermoactivated mechanism with a spectrum of hyperbolic-shape barriers, suitable for a wide range of strain rate and temperature. Relations with other existing models or rate theories, which may be regarded a special cases of present model, are examined. Good agreement with experimental data for both fcc and bcc metals is shown. The activation volume is found dependent on temperature according to an exponential law. A simple parameter, which describes the equivalence between strain rate effects and temperature effects on flow stress, is suggested similar to Zener-Hollomon parameters

Copyright © 1984 by ASME
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