Isothermal and nonisothermal fatigue behavior of a metal matrix composite
- NASA, Lewis Research Center, Cleveland, OH (USA)
The isothermal and nonisothermal fatigue resistance of a metal matrix composite (MMC) consisting of Ti-15V-3Cr-3Al-3Sn (Ti-15-3) matrix reinforced by 33 vol pct continuous SiC fibers was investigated. The fibers were nominally oriented parallel to the specimen axis. Isothermal fatigue tests were performed in air at 300 and 550 C. The MMC had good isothermal fatigue resistance at low cyclic stress, with fatigue cracks initiating from fiber-matrix interfaces and foil laminations. At high cyclic stresses, stress relaxation in the matrix reduced isothermal composite fatigue resistance at 550 C. Nonisothermal fatigue loading substantially degraded composite fatigue resistnce. This degradation was produced by a thermomechanical fatigue damage mechanism associated with the fiber-matrix interfaces. 19 refs.
- OSTI ID:
- 6735046
- Journal Information:
- Journal of Composite Materials; (USA), Journal Name: Journal of Composite Materials; (USA) Vol. 24; ISSN JCOMB; ISSN 0021-9983
- Country of Publication:
- United States
- Language:
- English
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Cermets
& Refractories-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
COMPOSITE MATERIALS
CRACKS
EXPANSION
FATIGUE
FIBERS
HEAT TREATMENTS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
SILICON CARBIDES
SILICON COMPOUNDS
THERMAL EXPANSION
TIN ALLOYS
TITANIUM ALLOYS
VANADIUM ALLOYS