Failure behavior of a 2-D woven SiC fiber/SiC matrix composite at ambient and elevated temperatures
The failure behavior of a 2D woven SiC fiber/SiC matrix composite at ambient and elevated temperatures was studied by characterizing the R-curve behavior at ambient temperature and at 1200 C using compact tension fracture mechanics specimens. A rising R-curve behavior was observed at ambient temperature caused by fiber bridging and microcracking in the crack wake. Significant toughening was also generated by microcracking in the crack front zone. The R-curve effect at ambient temperature was substantially reduced at 1200 C as a result of degradation of the Nicalon fibers. Delamination crack growth was observed at 1200 deg indicative of a weakened fiber/matrix interface. Toughening at elevated temperature appears to result from a combination of crack branching and microcracking. 6 refs.
- OSTI ID:
- 7201617
- Report Number(s):
- CONF-920144-; CODEN: CESPD
- Journal Information:
- Ceramic Engineering and Science Proceedings; (United States), Vol. 13:7-8; Conference: 16. annual conference on composites, materials, and structures, Cocoa Beach, FL (United States), 13-16 Jan 1992; ISSN 0196-6219
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
FAILURE MODE ANALYSIS
FRACTURE PROPERTIES
SILICON CARBIDES
CRACK PROPAGATION
DEFORMATION
FIBERS
FRACTURE MECHANICS
INTERFACES
LAYERS
MATRIX MATERIALS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
CARBIDES
CARBON COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
SILICON COMPOUNDS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TEMPERATURE RANGE
360603* - Materials- Properties