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

Miscellaneous · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5463016

Singh, D

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.

• Research Organization: Utah Univ., Salt Lake City, UT (United States)
• OSTI ID: 5463016
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

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