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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Fatigue Cracking in Fiber-Reinforced Metal Matrix Composites Under Mechanical and Thermal Loads

[+] Author and Article Information
G. Bao

Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218

R. M. McMeeking

Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106

J. Eng. Gas Turbines Power 118(2), 416-423 (Apr 01, 1996) (8 pages) doi:10.1115/1.2816606 History: Received March 18, 1995; Online November 19, 2007

Abstract

This article reviews micromechanical models developed for fatigue cracking in fiber-reinforced metal matrix composites under mechanical and thermal loads. Emphasis is placed on the formulae and design charts that can quantify the fatigue crack growth and fiber fracture. The composite is taken to be linear elastic, with unidirectional aligned fibers. Interfacial debonding is assumed to occur readily, allowing fibers to slide relative to the matrix resisted by a uniform shear stress. The fibers therefore bridge any matrix crack that develops. The crack bridging traction law includes the effect of thermal expansion mismatch between the fiber and the matrix and a temperature dependence of the frictional shear stress. Predictions are made of the crack tip stress intensities, matrix fatigue crack growth, and maximum fiber stresses under mechanical or thermomechanical loads. For composites under thermomechanical load, both in-phase and out-of-phase fatigue are modeled. The implications for life prediction for fiber-reinforced metal matrix composites are discussed.

Copyright © 1996 by The American Society of Mechanical Engineers
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