SYMPOSIA PAPER Published: 01 January 2000
STP15013S

Notch-Sensitivity of a Woven Oxide/Oxide Ceramic Matrix Composite

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Oxide/oxide ceramic matrix composites (CMC) are currently being demonstrated in high-temperature aerospace applications. An oxide/oxide CMC under consideration by the U.S. Air Force is Nextel720/AS, which consists of an alumina-silica matrix (AS) reinforced with a woven Nextel720 fiber mat. The fracture behavior of notched Nextel720/AS at room and expected service temperatures is discussed in this paper. Specimens with semi-circular and narrow double-edge notches were tested under monotonic loading in laboratory air at 23 to 1200°C, and under sustained (creep) loading at 1100°C. The results show that Nextel720/AS is notch-insensitive at low temperatures (≤ 1000°C) and ≈22% notch-sensitive at higher temperatures (≥ 1100°C) under tensile loading. At 1100°C, the notch-sensitivity increased significantly under sustained loading.

Author Information

John, R
Materials & Manufacturing Directorate (AFRL/MLLN), Air Force Research Laboratory, Wright-Patterson AFB, OH
Buchanan, DJ
University of Dayton Research Institute, Dayton, OH
Zawada, LP
Materials & Manufacturing Directorate (AFRL/MLLN), Air Force Research Laboratory, Wright-Patterson AFB, OH
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Details
Developed by Committee: C28
Pages: 172–181
DOI: 10.1520/STP15013S
ISBN-EB: 978-0-8031-5440-7
ISBN-13: 978-0-8031-2872-9