Measurement of Elastic Moduli by Rectangular Parallelepiped Resonance Method II

The rectangular parallelepiped resonance method can be a very powerful method if universal procedure to obtain elastic moduli from measured resonance frequencies is established. The procedure proposed in this paper has the possibility to determine all elastic moduli of crystals with symmetry down to orthorhombic symmetry. However, we have only confirmed that the method gives correct elastic moduli of specimen with cubic symmetry without previous information. Although we need a great many of measured resonance frequencies from the lowest frequency to very high frequencies to determine all independent elastic moduli of specimen having lower symmetry than cubic symmetry, we can determine the shear moduli (C 44, C 55, C 66) from much fewer of measured resonance frequencies.