Volume 22, Issue 6 (November 1994)

    Temperature Dependence of Dynamic Young's Modulus and Mechanical Damping in a Nextel Fiber-Reinforced Glass Composite

    (Received 1 October 1993; accepted 27 May 1994)

    CODEN: JTEOAD

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    Abstract

    The piezoelectric ultrasonic composite oscillator technique (PUCOT), was used to measure the temperature dependence of dynamic Young's modulus and damping for a ceramic matrix composite (CMC) consisting of N51A glass as the matrix and Nextel 480 continuous fibers (volume fraction 0.29) as the reinforcement. The temperature range covered was 20 to 462°C. It was found that the Young's modulus decreased linearly with temperature, at a relatively low rate, and that the damping followed the form exp(-H/kT), where the value of the effective activation energy H was 0.07 ± 0.02 eV/atom, k is Boltzmann's constant, and T is temperature in Kelvin. Possible interpretations for this value of H are discussed. The glass transition temperature of the glass was found to be about 500°C.


    Author Information:

    Wolfenden, A
    Texas A&M University, College Station, TX

    Gill, JE
    Texas A&M University, College Station, TX

    Chawla, KK
    New Mexico Institute of Mining and Technology, Socorro, NM

    Vaidya, RU
    Los Alamos National Laboratory, Los Alamos, NM

    Venkatesh, R
    New Mexico Institute of Mining and Technology, Socorro, NM


    Stock #: JTE11863J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11863J

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    Title Temperature Dependence of Dynamic Young's Modulus and Mechanical Damping in a Nextel Fiber-Reinforced Glass Composite
    Symposium , 0000-00-00
    Committee E07