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Subcritical crack growth in soda-lime glass in combined mode I and mode II loadingSubcritical crack growth under mixed-mode loading was studied in soda-lime glass. Pure mode I, combined mode I and mode II, and pure mode II loadings were achieved in precracked disk specimens by loading in diametral compression at selected angles with respect to the symmetric radial crack. Crack growth was monitored by measuring the resistance changes in a microcircuit grid consisting of parallel, electrically conducting grid lines deposited on the surface of the disk specimens by photolithography. Subcritical crack growth rates in pure mode I, pure mode II, and combined mode I and mode II loading could be described by an exponential relationship between crack growth rate and an effective crack driving force derived from a mode I-mode II fracture toughness envelope. The effective crack driving force was based on an empirical representation of the noncoplanar strain energy release rate. Stress intensities for kinked cracks were assessed using the method of caustics and an initial decrease and a subsequent increase in the subcritical crack growth rates of kinked cracks were shown to correlate with the variations of the mode I and the mode II stress intensities.
Document ID
19930068154
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Singh, Dileep
(NASA Lewis Research Center Cleveland, OH, United States)
Shetty, Dinesh K.
(Utah Univ. Salt Lake City, United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1990
Publication Information
Publication: American Ceramic Society, Journal
Volume: 73
Issue: 12
ISSN: 0002-7820
Subject Category
Nonmetallic Materials
Accession Number
93A52151
Funding Number(s)
CONTRACT_GRANT: NAG3-789
Distribution Limits
Public
Copyright
Other

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