Nonlinear Viscoelastic Analysis of a Unidirectional Composite Material

[+] Author and Article Information
B. G. Schaffer, D. F. Adams

Department of Mechanical Engineering, University of Wyoming, Laramie, Wyo. 82071

J. Appl. Mech 48(4), 859-865 (Dec 01, 1981) (7 pages) doi:10.1115/1.3157746 History: Received August 01, 1980; Revised January 01, 1981; Online July 21, 2009


The single-integral nonlinear viscoelastic constitutive equations developed by Schapery from thermodynamic theory have been adapted to analyze the time-dependent response of a unidirectional composite material. This viscoelastic analysis has been combined with an existing time-independent elastoplastic micromechanics analysis, to permit the study of nonlinear time-dependent response of materials loaded beyond their elastic limit. Literature values as well as a brief series of creep-recovery tests on a typical epoxy resin were used to characterize the nonlinear viscoelastic response of the matrix constituent of a composite material. Composite response under transverse loading at various stress levels was then predicted, and the results compared with actual composite creep data.

Copyright © 1981 by ASME
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