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 Nextel 720/AS, which consists of an alumina-silica matrix (AS) reinforced with a woven Nextel 720 fiber mat. The fracture behavior of notched Nextel 720/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 deg C to 1200 deg C, and under sustained (creep) loading at 1100 deg C. The results show that Nextel 720/AS is notch-insensitive at low temperatures (< or = < 1000 deg C) and approx. 22 % notch-sensitive at higher temperatures (> 1100 deg C ) under tensile loading. At 1100 deg C, the notch-sensitivity increased significantly under sustained loading.


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