Ceramic Component Reliability With the Restructured NASA/CARES Computer Program

Abstract

The Ceramics Analysis and Reliability Evaluation of Structures (CARES) integrated design program on statistical fast fracture reliability of monolithic ceramic components is enhanced to include the use of a neutral data base, two-dimensional modeling and variable problem size. The data base allows for the efficient transfer of element stresses, temperatures and volumes/areas from the finite element output to the reliability analysis program. Elements are divided to insure a direct correspondence between the subelements and the Gaussian integration points. Two-dimensional modeling is accomplished by assessing the volume flaw reliability with shell elements. To demonstrate the improvements in the algorithm, example problems are selected from a round-robin conducted by WELFEP (WEakest Link failure probability prediction by Finite Element Postprocessors).