Cyclic Fatigue-Crack Growth in Grain Bridging Ceramics

[+] Author and Article Information
Reinhold H. Dauskardt

Center for Advanced Materials, Materials Science Division, Lawrence Berkeley Laboratory; Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720

J. Eng. Mater. Technol 115(3), 244-251 (Jul 01, 1993) (8 pages) doi:10.1115/1.2904214 History: Received August 15, 1992; Online April 29, 2008


Cyclic fatigue degradation is contemplated in polycrystalline ceramics exhibiting grain bridging as the principle toughening mechanism. A frictional-wear mechanism based on repetitive sliding wear degradation of frictional grain bridges is discussed. A micromechanical model is developed which provides an insight into the effects of salient mechanical and microstructural variables such as wear rate at the grain/matrix interface and initial residual stress of bridging grains, on fatigue-crack growth behavior. Results of the analysis are compared to experimentally observed fatigue-crack growth rates in coarse grained alumina and silicon nitride.

Copyright © 1993 by The American Society of Mechanical Engineers
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