Unified Constitutive Equations of Foam Materials

[+] Author and Article Information
Fu S. Chang, Y. Song, D. X. Lu

Ford Motor Co., Room A110, VOGO, P.O. Box 1586, Dearborn, MI 48121

C. N. DeSilva

Mechanical Engineering Department, Wayne State University, Detroit, MI 48202

J. Eng. Mater. Technol 120(3), 212-217 (Jul 01, 1998) (6 pages) doi:10.1115/1.2812345 History: Received September 24, 1995; Revised December 23, 1997; Online November 27, 2007


A unified constitutive equation with the effect of compression strain rate, tension strain, and shear strain for foam materials with very low Poisson’s ratio has been developed. The mathematical derivation of the constitutive equation is described in detail. The effect of each parameter in the constitutive equation is studied. Numerical formula and procedure are also included in the paper. The test data of two types of energy absorbing foam materials are used for correlation study: polyurethane foam, which was tested at five compressive strain rates, and polypropylene foam, which was tested for quasi-static compression, tension, and shear. Good correlations have been concluded for both cases.

Copyright © 1998 by The American Society of Mechanical Engineers
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