Extending the Theory of Creep to Viscoplasticity

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

National Aeronautics and Space Administration, Lewis Research Center, Materials Division, MS 105-1, Cleveland, OH 44135-3191

K. P. Walker

Engineering Science Software, Inc., Smithfield, RI 02917

M. J. Verrilli

National Aeronautics and Space Administration, Lewis Research Center, Structures Division, MS 49-7, Cleveland, OH 44135-3191

J. Pressure Vessel Technol 116(1), 67-75 (Feb 01, 1994) (9 pages) doi:10.1115/1.2929560 History: Received April 13, 1993; Revised September 08, 1993; Online June 17, 2008


A viscoplastic theory is developed that reduces to creep theory analytically under steady-state conditions. A fairly simple model is constructed from this theoretical framework by defining material functions that have close ties to the physics of inelasticity; consequently, the model is characterized easily. The computational characteristics of the model are enhanced, in general, by converting the kinetics equation from a hyperbolic relationship to a power-law relationship. The resulting model is applied to copper and to the copper alloy, NARloy Z.

Copyright © 1994 by The American Society of Mechanical Engineers
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