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

Thesis/Dissertation · Tue Jan 01 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CRACK PROPAGATION
FRACTURE PROPERTIES
GLASS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
SILICON NITRIDES
STRESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES