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Measuring Crack Length in Coarse Grain CeramicsDue to a coarse grain structure, crack lengths in precracked spinel specimens could not be measured optically, so the crack lengths and fracture toughness were estimated by strain gage measurements. An expression was developed via finite element analysis to correlate the measured strain with crack length in four-point flexure. The fracture toughness estimated by the strain gaged samples and another standardized method were in agreement.
Document ID
20100017326
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Salem, Jonathan A. (NASA Glenn Research Center Cleveland, OH, United States)
Ghosn, Louis J. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
March 1, 2010
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA/TM-2010-216242
E-17229
Funding Number(s)
WBS: WBS 441261.04.22.04.03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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