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Effects of subcritical crack growth on fracture toughness of ceramics assessed in chevron-notched three-point bend testsA numerical computational study was carried out to assess the effects of subcritical crack growth on crack stability in the chevron-notched three-point bend specimens. A power-law relationship between the subcritical crack velocity and the applied stress intensity were used along with compliance and stress-intensity relationships for the chevron-notched bend specimen to calculate the load response under fixed deflection rate and a machine compliance. The results indicate that the maximum load during the test occurs at the same crack length for all the deflection rates; the maximum load, however, is dependent on the deflection rate for rates below the critical rate. The resulting dependence of the apparent fracture toughness on the deflection rate is compared to experimental results on soda-lime glass and polycrystalline alumina.
Document ID
19880067049
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chao, L. Y.
(Utah Univ. Salt Lake City, UT, United States)
Singh, D.
(Utah Univ. Salt Lake City, UT, United States)
Shetty, D. K.
(Utah, University Salt Lake City, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1988
Subject Category
Structural Mechanics
Report/Patent Number
ASME PAPER 88-GT-185
Accession Number
88A54276
Funding Number(s)
CONTRACT_GRANT: NAG3-789
Distribution Limits
Public
Copyright
Other

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