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Foreign Object Damage Behavior of a SiC/SiC Composite at Ambient and Elevated Temperatures
- Publication Year :
- 2004
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 2004.
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Abstract
- Foreign object damage (FOD) behavior of a gas-turbine grade SiC/SiC ceramic matrix composite (CMC) was determined at 25 and 1316 C, employing impact velocities from 115 to 440 meters per second by 1.59-mm diameter stell-ball projectiles. Two different types of specimen support were used at each temperature: fully supported and partially supported. For a given temperature, the degree of post-impact strength degradation increased with increasing impact velocity, and was greater in a partially supported configuration than in a fully supported one. The elevated-temperature FOD resistance of the composite, particularly under partially supported loading at higher impact velocities greater than or equal to 350 meters per second, was significantly less than the ambient-temperature counterpart, attributed to a weakening effect of the composite. For fully supported loading, frontal contact stress played a major role in generating composite damage; whereas, for partially supported loading, both frontal contact and backside bending stresses were combined sources of damage generation. The SiC/SiC composite was able to survive higher energy impacts without complete structural failure but suffered more strength affecting damage from low energy impacts than AS800 and SN282 silicon nitrides.
- Subjects :
- Composite Materials
Subjects
Details
- Language :
- English
- Database :
- NASA Technical Reports
- Notes :
- 714-30-19
- Publication Type :
- Report
- Accession number :
- edsnas.20040111389
- Document Type :
- Report