Durability evaluation of ceramic components using CARES/LIFE

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2816531· OSTI ID:207762

Nemeth, N N; Janosik, L A; Gyekenyesi, J P ^[1]; Powers, L M ^[2]

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1. National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
2. Cleveland State Univ., OH (United States). Dept. of Civil Engineering

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.

• Sponsoring Organization: USDOE
• OSTI ID: 207762
• Report Number(s): CONF-940626--
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 1 Vol. 118; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

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