Dynamic fracture toughness and microstructural fracture mechanisms in ceramics

Conference · Wed Aug 01 00:00:00 EDT 1990 · Ceramic Engineering and Science Proceedings; (USA)

OSTI ID:6191202

Kishi, T; Takeda, N; Kim, B N

The dynamic fracture toughness of ceramics was evaluated by the strain-gage method, the applicability of which was demonstrated by the two-dimensional dynamic finite element method. Five kinds of ceramics were tested: Al{sub 2}O{sub 3}, ZrO{sub 2} (TZP), Si{sub 3}N{sub 4}, SiC, and sialon. The fracture toughness of Al{sub 2}O{sub 3} and TZP increased with increasing loading rate, while that of the others remained almost constant. For Al{sub 2}O{sub 3}, the increased toughness was explained by microcracking and branching near the precrack tip. In TZP, on the other hand, transformation to the monoclinic phase contributed to the increased toughness. 15 refs.

• OSTI ID: 6191202
• Report Number(s): CONF-900160--
• Journal Information: Ceramic Engineering and Science Proceedings; (USA), Journal Name: Ceramic Engineering and Science Proceedings; (USA) Vol. 11; ISSN 0196-6219; ISSN CESPD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CRYSTAL STRUCTURE
DYNAMIC LOADS
FRACTURE MECHANICS
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES