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RESEARCH PAPERS

Role of Porosity in Estimates of Composite Elastic Constants

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

Lawrence Livermore National Laboratory, P.O. Box 808 L-202, Livermore, CA 94551-9900

J. Energy Resour. Technol 116(2), 87-96 (Jun 01, 1994) (10 pages) doi:10.1115/1.2906023 History: Received March 07, 1993; Revised February 03, 1994; Online April 16, 2008

Abstract

The presence of small amounts of residual void space (on the order of one percent by volume) is sufficient to make estimates of composite elastic constants (obtained while ignoring this porosity) violate the Hashin-Shtrikman bounds in many cases. Experimental values falling below the incorrectly estimated lower bound is the normal direction of violation, but erroneous neglect of porosity in “pure” samples can also lead to experimental values rising above the incorrectly computed upper bound. Examples are presented to illustrate the nature of the error and methods of correcting it for data on composite ceramics. The result is improved agreement between the Hashin-Shtrikman bounds, effective medium theory estimates, and experimental data.

Copyright © 1994 by The American Society of Mechanical Engineers
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