Crack propagation behavior of polycrystalline alumina under static and cyclic load
- Toyota Technological Inst., Nagoya (Japan)
- Japan Fine Ceramics Center, Nagoya (Japan)
Various causes for cyclic-loading fatigue in ceramics have been proposed. Degradation in the grain-bridging effect is the most important cause for cyclic-loading fatigue in non-transforming ceramics. Cyclic- and static-loading crack propagation behavior in terms of crack propagation rate, load-strain curve, and R-curve in compact tension specimens of polycrystalline aluminas with two types of average grain size is reported. Significant bridging is observed in coarse-grained alumina. The results are consistent with the proposal that grain bridging increases with grain size and that degradation in grain bridging increases with grain size and that degradation in grain bridging is the most important cause for cyclic-loading fatigue in alumina ceramics.
- OSTI ID:
- 7114789
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:5; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRACK PROPAGATION
CRYSTALS
DATA
EXPERIMENTAL DATA
GRAIN SIZE
INFORMATION
MATERIALS TESTING
MECHANICAL TESTS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
SIZE
TESTING