ISSN: 0090-3973
Page Count: 3

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

Wolfenden, A
Texas A&M University,TX,

Gill, JE
Texas A&M University,TX,

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

Vaidya, RU
Los Alamos National Laboratory,NM,

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

(Received 1 October 1993; accepted 27 May 1994)

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.

Keywords:
ceramics, glass, fibers, composites, Young's modulus, damping, internal friction, temperature, piezoelectric, ultrasonic, dynamic, Nextel 480

Paper ID: JTE11863J
DOI: 10.1520/JTE11863J
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