SYMPOSIA PAPER Published: 01 January 1994

Time-Dependent Reliability Analysis of Monolithic Ceramic Components Using the Cares/Life Integrated Design Program


The computer program CARES/LIFE calculates the time-dependent reliability of monolithic ceramic components subjected to thennomechanical 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 either the power or Paris law relations. 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), Weibull's normal stress averaging method (NSA), or Batdorf's theory. Inert strength and fatigue parameters are estimated from rupture strength data of naturally flawed specimens loaded in static, dynamic, or cyclic fatigue. Two example problems demonstrating component reliability analysis and fatigue parameter estimation are included.

Author Information

Nemeth, NN
NASA Lewis Research Center, Cleveland, OH
Powers, LM
Cleveland State University, Cleveland, OH
Janosik, LA
NASA Lewis Research Center, Cleveland, OH
Gyekenyesi, JP
NASA Lewis Research Center, Cleveland, OH
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Developed by Committee: C28
Pages: 390–408
DOI: 10.1520/STP12795S
ISBN-EB: 978-0-8031-5268-7
ISBN-13: 978-0-8031-1864-5