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RESEARCH PAPERS

Thermal Expansion of Elastic-Plastic Composite Materials

[+] Author and Article Information
G. J. Dvorak

Department of Civil Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Appl. Mech 53(4), 737-743 (Dec 01, 1986) (7 pages) doi:10.1115/1.3171852 History: Received October 21, 1985; Online July 21, 2009

Abstract

Exact relationships are derived between instantaneous overall thermal stress or strain vectors and instantaneous overall mechanical stiffness or compliance, for two binary composite systems in which one of the phases may deform plastically. Also, the local instantaneous thermal strain and stress concentration factors are related in an exact way to the corresponding mechanical concentration factors. The results depend on instantaneous thermoelastic constants and volume fractions of the phases. They are found for fibrous composites with two distinct elastically isotropic or transversely isotropic phases, and for any binary composite with elastically isotropic phases. The results indicate that in the plastic range the thermal and mechanical loading effects are coupled even if the phase properties do not depend on changes in temperature. The derivation is based on a novel decomposition procedure which shows that spatially uniform elastic strain fields can be created in certain heterogeneous media by superposition of uniform phase eigenstrains with local strains, caused by piecewise uniform stress fields which are in equilibrium with prescribed surface tractions. The method is extended to discretized microstructures, and also to the analysis of moisture absorption and phase transformation effects on overall response and on local fields in the two composite materials.

Copyright © 1986 by ASME
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