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Effect of Environment on Stress-Rupture Behavior of a Carbon Fiber-Reinforced Silicon Carbide (C/SiC) Ceramic Matrix CompositeStress-rupture tests were conducted in air, vacuum, and steam-containing environments to identify the failure modes and degradation mechanisms of a carbon fiber-reinforced silicon carbide (C/SiC) composite at two temperatures, 600 and 1200 C. Stress-rupture lives in air and steam containing environments (50 - 80% steam with argon) are similar for a composite stress of 69 MPa at 1200 C. Lives of specimens tested in a 20% steam/argon environment were about twice as long. For tests conducted at 600 C, composite life in 20% steam/argon was 20 times longer than life in air. Thermogravimetric analysis of the carbon fibers was conducted under similar conditions to the stress-rupture tests. The oxidation rate of the fibers in the various environments correlated with the composite stress-rupture lives. Examination of the failed specimens indicated that oxidation of the carbon fibers was the primary damage mode for specimens tested in air and steam environments at both temperatures.
Document ID
Document Type
Preprint (Draft being sent to journal)
Verrilli, Michael J. (NASA Glenn Research Center Cleveland, OH, United States)
Opila, Elizabeth J. (Cleveland State Univ. Cleveland, OH, United States)
Calomino, Anthony (NASA Glenn Research Center Cleveland, OH, United States)
Kiser, J. Douglas (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 21, 2013
Publication Date
November 26, 2002
Subject Category
Composite Materials
Funding Number(s)
WBS: WBS 22-708-73-13
Distribution Limits
Public Use Permitted.
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