STP1201

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

    Published: Jan 1994


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    Abstract

    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.

    Keywords:

    CARES, CARES/LIFE, ceramic design, fatigue, reliability, Batdorf, Weibull, subcritical crack growth


    Author Information:

    Nemeth, NN
    Research engineer and manager, NASA Lewis Research Center, Cleveland, OH

    Powers, LM
    Research associate, Cleveland State University, Cleveland, OH

    Janosik, LA
    Research engineer and manager, NASA Lewis Research Center, Cleveland, OH

    Gyekenyesi, JP
    Research engineer and manager, NASA Lewis Research Center, Cleveland, OH


    Paper ID: STP12795S

    Committee/Subcommittee: C28.02

    DOI: 10.1520/STP12795S


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