Measurement of elastic moduli from the impact sound of ceramic matrix composites at elevated temperatures
- Takushoku Univ., Tokyo (Japan). Dept. of Mechanical Systems Engineering
- Ishikawajima-Harima Heavy Industries Co., Ltd., Tanashi (Japan)
A simple instrumentation system is developed for determining the elastic moduli of ceramic matrix composites from the sound produced by the impact of a sphere on a specimen which is suspended by thin 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 these frequencies using Timoshenko`s beam theory and also Saint-Venant`s torsion theory. Two or three specimens are cut out from different orientations of the test materials in order to measure anisotropic elastic moduli. The validity of the measurement method is demonstrated by preliminary tests on ceramic and metallic specimens of known elastic moduli. Ceramic matrix composites are tested at elevated temperatures up to 1,100 C and the temperature dependence of the elastic moduli is shown in the graphs.
- OSTI ID:
- 89761
- Report Number(s):
- CONF-9409291--; ISBN 1-56676-220-0
- Country of Publication:
- United States
- Language:
- English
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