Time-dependent reliability analysis of ceramic engine components

Conference · Fri Oct 01 04:00:00 EDT 1993

OSTI ID:142068

Nemeth, N N

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 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), 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. Two example problems demonstrating proof testing and fatigue parameter estimation are given.

• Research Organization: National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
• OSTI ID: 142068
• Report Number(s): N--94-22608; NASA-CP--3230; L--17321; NAS--1.55:3230; CONF-9210441--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
C CODES
CERAMICS
CRACK PROPAGATION
MECHANICAL PROPERTIES
RELIABILITY
THERMODYNAMICS
TIME DEPENDENCE