Local-Global Analysis of Crack Growth in Continuously Reinforced Ceramic Matrix Composites

[+] Author and Article Information
R. Ballarini, S. Ahmed

Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106

J. Eng. Gas Turbines Power 112(4), 512-520 (Oct 01, 1990) (9 pages) doi:10.1115/1.2906197 History: Received January 23, 1989; Online April 24, 2008


This paper describes the development of a mathematical model for predicting the strength and micromechanical failure characteristics of continuously reinforced ceramic matrix composites. The local-global analysis models the vicinity of a propagating crack tip as a local heterogeneous region (LHR) consisting of springlike representations of the matrix, fibers, and interfaces. This region is embedded in an anisotropic continuum (representing the bulk composite), which is modeled by conventional finite elements. Parametric studies are conducted to investigate the effects of LHR size, component properties, interface conditions, etc. on the strength and sequence of the failure processes in the unidirectional composite system. The results are compared with those predicted by the models developed by Marshall et al. (1985) and by Budiansky et al. (1986).

Copyright © 1990 by The American Society of Mechanical Engineers
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