STP1392

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

    Published: Jan 2000


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    Abstract

    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.

    Keywords:

    ceramic matrix composite, creep, fracture, notch-sensitivity, notch strength, oxide/oxide, sustained loading


    Author Information:

    John, R
    Materials research engineers, Materials & Manufacturing Directorate (AFRL/MLLN), Air Force Research Laboratory, Wright-Patterson AFB, OH

    Buchanan, DJ
    Associate research engineer, University of Dayton Research Institute, Dayton, OH

    Zawada, LP
    Materials research engineers, Materials & Manufacturing Directorate (AFRL/MLLN), Air Force Research Laboratory, Wright-Patterson AFB, OH


    Paper ID: STP15013S

    Committee/Subcommittee: C28.07

    DOI: 10.1520/STP15013S


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