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Fracture toughness of polycrystalline ceramics in combined mode I and mode II loadingThe present investigation of the fracture of alumina and zirconia polycrystalline ceramic specimens of precracked-disk type, in diametral compression, evaluated fracture toughness in pure mode I, combined mode I/mode II, and pure mode II, depending on the alignment of the center crack relative to the loading diameter. The mixed-mode fracture-toughness envelope thus obtained exhibits significant deviation to higher fracture toughness in mode II, relative to the predictions of linear elastic fracture mechanics theory. Crack-surface resistance due to grain-interlocking and abrasion are identified as the primary sources of increased fracture resistance in mode II loading of the polycrystalline ceramics.
Document ID
19890039086
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Singh, Dileep
(Utah Univ. Salt Lake City, UT, United States)
Shetty, Dinesh K.
(Utah, University Salt Lake City, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: American Ceramic Society, Journal
Volume: 72
ISSN: 0002-7820
Subject Category
Nonmetallic Materials
Accession Number
89A26457
Funding Number(s)
CONTRACT_GRANT: NAG3-789
Distribution Limits
Public
Copyright
Other

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