Fatigue crack growth in ceramic materials at ambient and elevated temperatures
The mechanics and mechanisms of stable fatigue crack growth in a wide variety of ceramics and ceramic composites are examined in detail. Experimental results on crack growth, numerical analyses and microscopic observations of crack-tip damage zones are presented to illustrate fatigue processes with: (1) a mode of failure that is distinctly different from that seen under static loads; (2) kinematic irreversibility of microscopic deformation which leads to cyclic damage zones, analogous to cyclic plastic zones in metal fatigue; and (3) crack velocities which are distinctly different from those found under static load failure due to a mechanical-environmental synergistic effect or as a result of purely mechanical contact phenomena such as crack closure, crack bridging by grains or reinforcements, or wedging of crack faces by debris particles. 19 refs., 6 figs.
- Research Organization:
- Brown Univ., Providence, RI (USA). Div. of Engineering
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-84ER45167
- OSTI ID:
- 7009088
- Report Number(s):
- DOE/ER/45167-2; CONF-900764-2; ON: DE90008418
- Resource Relation:
- Conference: Fatigue 90 international conference, Honolulu, HI (USA), 15-20 Jul 1990
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM OXIDES
CRACK PROPAGATION
CERAMICS
SILICON CARBIDES
COMPRESSION
DEFORMATION
FATIGUE
WHISKERS
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTALS
MECHANICAL PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
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360203* - Ceramics
Cermets
& Refractories- Mechanical Properties