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Ceramics Analysis and Reliability Evaluation of Structures (CARES). Users and programmers manualThis manual describes how to use the Ceramics Analysis and Reliability Evaluation of Structures (CARES) computer program. The primary function of the code is to calculate the fast fracture reliability or failure probability of macroscopically isotropic ceramic components. These components may be subjected to complex thermomechanical loadings, such as those found in heat engine applications. The program uses results from MSC/NASTRAN or ANSYS finite element analysis programs to evaluate component reliability due to inherent surface and/or volume type flaws. CARES utilizes the Batdorf model and the two-parameter Weibull cumulative distribution function to describe the effect of multiaxial stress states on material strength. The principle of independent action (PIA) and the Weibull normal stress averaging models are also included. Weibull material strength parameters, the Batdorf crack density coefficient, and other related statistical quantities are estimated from four-point bend bar or unifrom uniaxial tensile specimen fracture strength data. Parameter estimation can be performed for single or multiple failure modes by using the least-square analysis or the maximum likelihood method. Kolmogorov-Smirnov and Anderson-Darling goodness-of-fit tests, ninety percent confidence intervals on the Weibull parameters, and Kanofsky-Srinivasan ninety percent confidence band values are also provided. The probabilistic fast-fracture theories used in CARES, along with the input and output for CARES, are described. Example problems to demonstrate various feature of the program are also included. This manual describes the MSC/NASTRAN version of the CARES program.
Document ID
19900018783
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Nemeth, Noel N. (Aerospace Design and Fabrication, Inc., Brook Park OH., United States)
Manderscheid, Jane M. (NASA Lewis Research Center Cleveland, OH, United States)
Gyekenyesi, John P. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1990
Subject Category
Structural Mechanics
Report/Patent Number
E-4722-1
NAS 1.60:2916
NASA-TP-2916
Accession Number
90N28099
Funding Number(s)
PROJECT: RTOP 505-63-1B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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