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RESEARCH PAPERS

Influence of Random Geometry on Effective Properties and Damage Formation In Composite Materials

[+] Author and Article Information
M. Ostoja-Starzewski, P. Y. Sheng, I. Jasiuk

Department of Materials Science and Mechanics, Michigan State University, East Lansing, MI 48824-1226

J. Eng. Mater. Technol 116(3), 384-391 (Jul 01, 1994) (8 pages) doi:10.1115/1.2904302 History: Received August 23, 1993; Revised February 06, 1994; Online April 29, 2008

Abstract

We study the effective moduli and damage formation in out-of-plane elasticity (i.e., two-dimensional conductivity) of matrix-inclusion composite materials with either randomly or periodically distributed inclusions (fibers). In this paper, we focus our attention on composites with isotropic phases, both of which have elastic-brittle response in damage. The elastic-brittle behavior is modeled with the help of a fine mesh finite-difference system, whereby damage evolution is simulated by sequentially removing/breaking bonds in this lattice in accordance with the state of stress/strain concentrations. The composite systems are specified by two parameters: stiffness ratio and strength ratio of both phases. In particular, we investigate the following aspects: basic classification of effective constitutive responses, geometric patterns of damage, varying degrees of randomness of the inclusions’ arrangements, and mesh resolutions of continuum phases.

Copyright © 1994 by The American Society of Mechanical Engineers
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