Elastic/Viscoplastic Theory Examined Using Radial Cylindrical Stress Waves

[+] Author and Article Information
R. P. Swift

Physics International, San Leandro, Calif.

I. M. Fyfe

Department of Aeronautics and Astronautics, University of Washington, Seattle, Wash.

J. Appl. Mech 37(4), 1134-1140 (Dec 01, 1970) (7 pages) doi:10.1115/1.3408670 History: Received December 29, 1969; Revised April 20, 1970; Online July 12, 2010


Two distinct types of experiments are employed to examine an elastic/viscoplastic constitutive theory in a radial cylindrical configuration. One examines the plane-strain plastic response of hollow cylinders subjected to an internal finite-rise-time pressure pulse; the other examines the decay behavior of the cylindrical elastic precursor associated with high stress level impact loading. A linear and an exponential form of the viscoplastic strain-rate function are considered. For 1100-0 aluminum, solutions of the associated initial-boundary-value problems show that, of the two forms, only the exponential viscoplastic strain-rate function, based on an activation energy dislocation concept, can satisfy the results of both experiments.

Copyright © 1970 by ASME
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