Test for Elastic Properties of Glass and Glass-Ceramic by Resonance
Test for Elastic Properties of Glass and Glass-Ceramic by Resonance
Some inherent resonance frequencies are present in glass and glass-ceramic materials. The test specimen’s density, elastic moduli, and geometry affect the resonance frequency. Understanding these criteria makes it easier to determine a material’s resonance frequency. In ASTM C623 testing, the resonance frequency value can be used to determine glass and glass-ceramic elastic properties.
Young’s modulus is calculated using the resonance frequency in the flexural vibration mode. Torsional resonance vibrations determine the shear modulus, also known as the stiffness modulus. Poisson’s ratio is calculated using Young’s modulus and shear modulus.
ASTM C623 can test any elastic, homogeneous, glass- or glass-ceramic material. Some materials cannot be examined using this approach because they have voids or cracks, which indicate in-homogeneities in the substance. Testing cannot be done on materials that are not prepared in a suitable geometry.
