Noninteractive Macroscopic Reliability Model for Ceramic Matrix Composites With Orthotropic Material Symmetry

[+] Author and Article Information
S. F. Duffy

Dept. of Civil Engineering and Engineering Mechanics, Cleveland State University, Cleveland, OH 44115

J. M. Manderscheid

Structural Integrity Branch, NASA Lewis Research Center, Cleveland, OH 44135

J. Eng. Gas Turbines Power 112(4), 507-511 (Oct 01, 1990) (5 pages) doi:10.1115/1.2906196 History: Received January 23, 1989; Online April 24, 2008


A macroscopic noninteractive reliability model for ceramic matrix composites is presented. The model is multiaxial and applicable to composites that can be characterized as orthotropic. Tensorial invariant theory is used to create an integrity basis with invariants that correspond to physical mechanisms related to fracture. This integrity basis is then used to construct a failure function per unit volume (or area) of material. It is assumed that the overall strength of the composite is governed by weakest link theory. This leads to a Weibull-type model similar in nature to the principle of independent action (PIA) model for isotropic monolithic ceramics. An experimental program to obtain model parameters is briefly discussed. In addition, qualitative features of the model are illustrated by presenting reliability surfaces for various model parameters.

Copyright © 1990 by The American Society of Mechanical Engineers
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