RESEARCH PAPERS: Gas Turbines: Ceramics

Dynamic Fatigue Testing of Candidate Ceramic Materials for Turbine Engines to Determine Slow-Crack-Growth Parameters

[+] Author and Article Information
N. R. Osborne, G. A. Graves

Metals and Ceramics Division, University of Dayton Research Institute, Dayton, OH 45469

M. K. Ferber

High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831

J. Eng. Gas Turbines Power 119(2), 273-278 (Apr 01, 1997) (6 pages) doi:10.1115/1.2815570 History: Received March 02, 1995; Online November 19, 2007


The purpose of this study was to evaluate the mechanical strength and slow-crack-growth parameter values for two commercially available silicon nitrides, SN-88 and NT164, at three high-temperature conditions. Weibull analysis and dynamic fatigue slow-crack-growth parameters were used to characterize the material strength and resistance to slow crack growth at high temperatures for use in life prediction models. Although both materials are commercially available Si3 N4 , their high-temperature behavior was found to be significantly different.

Copyright © 1997 by The American Society of Mechanical Engineers
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