Measurement of elastic moduli from the impact sound of engineering ceramics and composites at elevated temperatures
- Tokyo Inst. of Tech. (Japan). Dept. of Mechanical Engineering Science
A simple instrumentation system is developed for determining the elastic moduli of engineering ceramics and their composites from the sound produced by the impact of a sphere on a specimen which is suspended by thin wires or ceramic threads in a furnace. The natural frequencies of the flexural and torsional vibration modes are measured from the impact noise by using a fast Fourier transform analyzer. Elastic moduli are then computed from those frequencies by using Timoshenko`s beam theory and also Saint-Venant`s torsion theory. The validity of the measurement method is demonstrated by room-temperature tests on ceramic and metallic specimens of known elastic moduli. SiAlON and Al-Al{sub 2}O{sub 3} composites are tested at elevated temperatures up to 900 C. It is shown that the Young`s and shear moduli of the materials tested decrease with an increase in temperature, while Poisson`s ratio remains almost constant.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 136502
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 11 Vol. 78; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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