On the Prediction of Stress Relaxation From Known Creep of Nonlinear Materials

[+] Author and Article Information
D. Touati, G. Cederbaum

The Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel

J. Eng. Mater. Technol 119(2), 121-124 (Apr 01, 1997) (4 pages) doi:10.1115/1.2805982 History: Received March 02, 1996; Revised September 07, 1996; Online November 27, 2007


A method to predict the nonlinear relaxation behavior from creep experiments of nonlinear viscoelastic materials is presented. It is shown that for given nonlinear creep properties, and creep compliance represented by the Prony series, the Schapery creep model can be transformed into a set of first order nonlinear equations. The solution of these equations enables the obtaining of the nonlinear stress relaxation curves. The strain-dependent constitutive equation can then be constructed for a given nonlinear viscoelastic model, as needed for engineering applications. A comparison example of the calculated stress relaxation curves, with test data for polyurethane demonstrates the very good accuracy of the proposed method.

Copyright © 1997 by The American Society of Mechanical Engineers
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