Journal Published Online: 01 November 1994
Volume 22, Issue 6

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



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
Pages: 3
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: JTE11863J
ISSN: 0090-3973
DOI: 10.1520/JTE11863J