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Title: Fracture of structural ceramics in combined mode I and mode II loading

Abstract

Fracture toughness and subcritical crack growth behavior of structural ceramics were studied in combined mode I and mode II loading using precracked chevron-notched diametral compression disk specimens. Different stress states such as pure mode I, combined mode I and mode II and pure mode II were achieved in precracked disk specimens by loading in diametral compression at selected angles with respect to the symmetric radial crack. Mixed-mode fracture toughness for soda-lime glass, alumina, ceria-partially stabilized zirconia (Ce-TZP) and silicon nitride were assessed. The resulting fracture envelopes showed significant deviation to higher fracture toughness in mode II relative to the predictions of linear elastic fracture mechanics theory. The deviation was smallest for soda-lime glass and largest for polycrystalline alumina. Subcritical crack-growth behavior in combined mode was studied in soda-lime glass. 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.

Authors:
Publication Date:
Research Org.:
Utah Univ., Salt Lake City, UT (United States)
OSTI Identifier:
5463016
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph.D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; FRACTURE PROPERTIES; GLASS; CRACK PROPAGATION; SILICON NITRIDES; ZIRCONIUM OXIDES; CERIUM OXIDES; STRESSES; ALUMINIUM COMPOUNDS; CERIUM COMPOUNDS; CHALCOGENIDES; MECHANICAL PROPERTIES; NITRIDES; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PNICTIDES; RARE EARTH COMPOUNDS; SILICON COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360203* - Ceramics, Cermets, & Refractories- Mechanical Properties

Citation Formats

Singh, D. Fracture of structural ceramics in combined mode I and mode II loading. United States: N. p., 1991. Web.
Singh, D. Fracture of structural ceramics in combined mode I and mode II loading. United States.
Singh, D. 1991. "Fracture of structural ceramics in combined mode I and mode II loading". United States.
@article{osti_5463016,
title = {Fracture of structural ceramics in combined mode I and mode II loading},
author = {Singh, D},
abstractNote = {Fracture toughness and subcritical crack growth behavior of structural ceramics were studied in combined mode I and mode II loading using precracked chevron-notched diametral compression disk specimens. Different stress states such as pure mode I, combined mode I and mode II and pure mode II were achieved in precracked disk specimens by loading in diametral compression at selected angles with respect to the symmetric radial crack. Mixed-mode fracture toughness for soda-lime glass, alumina, ceria-partially stabilized zirconia (Ce-TZP) and silicon nitride were assessed. The resulting fracture envelopes showed significant deviation to higher fracture toughness in mode II relative to the predictions of linear elastic fracture mechanics theory. The deviation was smallest for soda-lime glass and largest for polycrystalline alumina. Subcritical crack-growth behavior in combined mode was studied in soda-lime glass. 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.},
doi = {},
url = {https://www.osti.gov/biblio/5463016}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}

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