Cyclic damage zones ahead of tensile fatigue cracks in ceramic materials

Conference · Wed Nov 01 00:00:00 EST 1989

OSTI ID:6964803

Suresh, S ^[1]; Brockenbrough, J R ^[2]

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1. Brown Univ., Providence, RI (USA). Div. of Engineering
2. 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

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CRACK PROPAGATION
CERAMICS
SILICON CARBIDES
COMPOSITE MATERIALS
CRACKS
FATIGUE
FINITE ELEMENT METHOD
GRAIN BOUNDARIES
INTERFACES
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties