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Some design considerations for ceramic components in heat engine applicationsThe design methodology for brittle material structures which is being developed and used at the Lewis Research Center for sizing ceramic components in heat engine applications is reviewed. Theoretical aspects of designing with structural ceramics are discussed, and a general purpose reliability program for predicting fast fracture response due to volume distributed flaws is described. Statistical treatment of brittle behavior, based on the Weibull model, is reviewed and its advantages, as well as drawbacks, are listed. A mechanistic statistical fracture theory, proposed by Batdorf to overcome the Weibull model limitations and based on Griffith fracture mechanics, is summarized. Failure probability predictions are made for rotating annular Si3N4 disks using various fracture models, and the results are compared to actual failure data. The application of these design methods to Government funded ceramics engine demonstration programs is surveyed. The uncertainty in observed component performance emphasizes the need for proof testing and improved nondestructive evaluation to guarantee adequate structural integrity.
Document ID
19880014491
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gyekenyesi, John P.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1986
Publication Information
Publication: Structural Ceramics
Subject Category
Nonmetallic Materials
Accession Number
88N23875
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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