Strain-Rate Effect in the Endochronic Theory of Viscoplasticity

[+] Author and Article Information
H.-C. Lin

Components Technology Division, Argonne National Laboratory, Argonne, Ill.

H.-C. Wu

Division of Materials Engineering, The University of Iowa, Iowa City, Iowa

J. Appl. Mech 43(1), 92-96 (Mar 01, 1976) (5 pages) doi:10.1115/1.3423803 History: Received November 01, 1974; Revised July 01, 1975; Online July 12, 2010


An explicit function of material parameter β1 is proposed to accommodate the strain-rate effect in the endochronic theory of viscoplasticity developed by Valanis. The strain-rate effects are treated in a manner that includes strain-rate history dependence. The theoretical stress-strain curves at constant strain rates are presented and compared with the existing experimental data. Based on this constitutive equation, the solution of one-dimensional plastic wave propagation in thin rods is obtained for annealed aluminum and copper. The theoretical strain-time profiles are in qualitative and quantitative agreement with the experimental results. It has been shown theoretically that the consideration of the strain-rate effect in the endochronic theory lowers the final constant strain states in the strain-time profiles.

Copyright © 1976 by ASME
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