Abstract
Results of a thorough study of the dynamic elastic moduli of polycrystalline silicon carbide at room temperature are presented. An improved resonant bar technique which uses a non-contacting optical device as the pick-up transducer is outlined. It provides a means for the unambiguous indexing of vibration modes. It is demonstrated that the effective shear coefficient, K, in flexure, can be determined from a study of the overtones of flexural resonance. The various approximate equations relating resonant frequencies to elastic moduli for rectangular section bars are compared. It is shown that Young's modulus values calculated from longitudinal, flatwise-flexural and edgewise-flexural modes are in very good agreement. The accuracy and self-consistency of the results are such that slight variability in specimen integrity can be detected by careful measurements of Young's modulus from flexural modes.
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