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--
- Journal Information:
- Ceramic Engineering and Science Proceedings; (United States), Journal Name: Ceramic Engineering and Science Proceedings; (United States) Vol. 13:7-8; ISSN 0196-6219; ISSN CESPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRACK PROPAGATION
DEFORMATION
FAILURE MODE ANALYSIS
FIBERS
FRACTURE MECHANICS
FRACTURE PROPERTIES
INTERFACES
LAYERS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MECHANICS
SILICON CARBIDES
SILICON COMPOUNDS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K