Viscoplastic Model Development With an Eye Toward Characterization

[+] Author and Article Information
Alan D. Freed

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135

Kevin P. Walker

Engineering Science Software, Inc., Smithfield, RI 02917

J. Eng. Mater. Technol 117(1), 8-13 (Jan 01, 1995) (6 pages) doi:10.1115/1.2804377 History: Received October 30, 1992; Revised February 24, 1994; Online November 27, 2007


A viscoplastic theory is developed that reduces analytically to creep theory under steady-state conditions. A viscoplastic model is constructed within this theoretical framework by defining material functions that have close ties to the physics of inelasticity. As a consequence, this model is easily characterized—only steady-state creep data, monotonic stress-strain curves, and saturated stress-strain hysteresis loops are required. The model is applied to the copper alloy NARloy Z.

Copyright © 1995 by The American Society of Mechanical Engineers
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