Fatigue behavior of continuous fiber-reinforced ceramic-matrix composites (CFCCs) at room and elevated temperatures
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
Fabric orientation effects on the fatigue behavior of Nicalon/Al{sub 2}O{sub 3} and Nicalon/SiC composites were investigated by performing the mechanical tests at room temperature (RT) in air, and at 1,000 C in an argon environment. It was observed that the flexural-fatigue behavior of the Nicalon/Al{sub 2}O{sub 3} composite at ambient and elevated temperatures was significantly affected by the orientation of the loading direction to the fabric plies. Also, there was a significant reduction in the fatigue life of the Nicalon/Al{sub 2}O{sub 3} composite at 1,000 C, relative to that at RT. In contrast, the fatigue behavior of the Nicalon/SiC composite was not noticeably influenced by either the fabric orientation or the test temperature. The micromechanisms responsible for the differences in the fatigue behavior of the Nicalon/Al{sub 2}O{sub 3} and Nicalon/SiC composites are elucidated in this paper.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 293105
- Report Number(s):
- CONF-970980--; ISBN 0-87339-382-1
- Country of Publication:
- United States
- Language:
- English
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