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RESEARCH PAPERS: Gas Turbines: Vehicular

Durability Evaluation of Ceramic Components Using CARES/LIFE

[+] Author and Article Information
N. N. Nemeth, L. A. Janosik, J. P. Gyekenyesi

NASA Lewis Research Center, Cleveland, OH 44135

L. M. Powers

Department of Civil Engineering, Cleveland State University, Cleveland, OH 44135

J. Eng. Gas Turbines Power 118(1), 150-158 (Jan 01, 1996) (9 pages) doi:10.1115/1.2816531 History: Received February 11, 1994; Online November 19, 2007

Abstract

The computer program CARES/LIFE calculates the time-dependent reliability of monolithic ceramic components subjected to thermomechanical and/or proof test loading. This program is an extension of the CARES (Ceramics Analysis and Reliability Evaluation of Structures) computer program. CARES/LIFE accounts for the phenomenon of subcritical crack growth (SCG) by utilizing the power law, Paris law, or Walker equation. The two-parameter Weibull cumulative distribution function is used to characterize the variation in component strength. The effects of multiaxial stresses are modeled using either the principle of independent action (PIA), the Weibull normal stress averaging method (NSA), or the Batdorf theory. Inert strength and fatigue parameters are estimated from rupture strength data of naturally flawed specimens loaded in static, dynamic, or cyclic fatigue. Application of this design methodology is demonstrated using experimental data from alumina bar and disk flexure specimens, which exhibit SCG when exposed to water.

Copyright © 1996 by The American Society of Mechanical Engineers
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