Modeling of grain-size-dependent microfracture-controlled sliding wear in polycrystalline alumina
- Northwestern Univ., Evanston, IL (United States). Center for Engineering Tribology
To quantify grain-size-dependent sliding wear of polycrystalline alumina induced by grain-boundary microfracture, an attempt is made to extend and combine Cho et al.'s fracture mechanics analysis and Fu and Evans' simple microcracking theory. An analytical equation is derived to relate wear with microstructural parameters. Wear by intergranular microfracture occurs, provided that the combined stresses are greater than a threshold value. The critical sliding time to the wear transition decreases with increasing grain size, and the wear rate after the threshold is proportional to the grain size. The theoretical predictions are correlated with the lubricated sliding wear data of aluminas with different grain sizes reported by Cho et al.
- OSTI ID:
- 6082853
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:9; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
GRAIN BOUNDARIES
GRAIN SIZE
MATHEMATICAL MODELS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SIZE
WEAR