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TECHNICAL PAPERS

A Model for Mechanically Induced Densification of Glassy Polymers

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

Institute for Industrial Mathematics, Four Hanachtom Street, Beersheba 84311, Israel

J. Appl. Mech. 66(3), 702-708 (Sep 01, 1999) (7 pages) doi:10.1115/1.2791621 History: Received June 23, 1998; Revised March 31, 1999; Online October 25, 2007

Abstract

Constitutive equations are derived for the isothermal viscoelastic response of glassy polymers at small strains. An amorphous polymer is modeled as a composite material consisting of a temporary network of long chains, immobile voids, and free volume gas diffusing through the network. The model is applied to analyze stress-induced densification of polymers in tensile and compressive relaxation tests. It is demonstrated that the stress-strain relations adequately predict a decrease in the specific volume observed in uniaxial experiments on polycarbonate.

Copyright © 1999 by The American Society of Mechanical Engineers
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