Cyclic damage zones ahead of tensile fatigue cracks in ceramic materials
- Brown Univ., Providence, RI (USA). Div. of Engineering
- Aluminum Co. of America, Alcoa Center, PA (USA). Alcoa Research Lab.
The development of a reversed flow or cyclic plastic zone is known to play an important role in influencing the growth of fatigue cracks in ductile metals subjected to constant and variable amplitude cyclic loads. In this paper, we present a detailed finite element analysis of the evolution of cyclic damage zones ahead of stationary cracks in brittle materials subjected to zero-tension fatigue loading. The damage mechanism considered here involves isotropic microcracking along grain boundaries and/or interfaces. It is shown that cyclic damage zones are induced ahead of tensile fatigue cracks in microcracking brittle solids when there is irreversible deformation at the crack-tip. The size of the cyclic damage zone and the variation of residual stress fields within the zone have been computed as a function of the extent of irreversibility of crack-tip damage. 15 refs., 5 figs.
- Research Organization:
- Brown Univ., Providence, RI (USA). Div. of Engineering
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-84ER45167
- OSTI ID:
- 6964803
- Report Number(s):
- CONF-900764-1; ON: DE90008372
- Resource Relation:
- Conference: Fatigue 90 international conference, Honolulu, HI (USA), 15-20 Jul 1990
- Country of Publication:
- United States
- Language:
- English
Similar Records
[High temperature fatigue crack growth in ceramics and ceramic composites]. [Annual report, August 1991--July 1992]
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ALUMINIUM OXIDES
CRACK PROPAGATION
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SILICON CARBIDES
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CRACKS
FATIGUE
FINITE ELEMENT METHOD
GRAIN BOUNDARIES
INTERFACES
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
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MICROSTRUCTURE
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OXIDES
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360203* - Ceramics
Cermets
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