Creep of 2618 Aluminum Under Step Stress Changes Predicted by a Viscous-Viscoelastic Model

[+] Author and Article Information
J. S. Lai

School of Civil Engineering, Georgia Institute of Technology, Atlanta, Ga. 30332

W. N. Findley

Division of Engineering, Brown University, Providence, R. I. 02912

J. Appl. Mech 47(1), 21-26 (Mar 01, 1980) (6 pages) doi:10.1115/1.3153623 History: Received April 01, 1979; Revised August 01, 1979; Online July 21, 2009


Nonlinear constitutive equations are developed and used to predict from constant stress data the creep behavior of 2618 Aluminum at 200°C (392°F) for tension or torsion stresses under varying stress history including stepup, stepdown, and reloading stress changes. The strain in the constitutive equation employed includes the following components: linear elastic, time-independent plastic, nonlinear time-dependent recoverable (viscoelastic), nonlinear time-dependent nonrecoverable (viscous) positive, and nonlinear time-dependent nonrecoverable (viscous) negative. The modified superposition principle, derived from the multiple integral representation, and strain-hardening theory were used to represent the recoverable and nonrecoverable components, respectively, of the time-dependent strain in the constitutive equations. Excellent-to-fair agreement was obtained between the experimentally measured data and the predictions based on data from constant-stress tests using the constitutive equations as modified.

Copyright © 1980 by ASME
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