Elastic Properties of Novel Materials Using PVDF Film and Resonance UltrasoundSpectroscopy

摘要

Elastic properties are of fundamental interest in condensed matter physics,material science, geoscience, and many branches of engineering. This paper describes the use of a relatively new technique, known as 'Resonant Ultrasound Spectroscopy' (RUS), with which the elastic properties of a small sample may be found in a single measurement, by analyzing a sufficient number of the sample's normal modes of free vibration. The present work describes the use of polyvinylidene (PVDF) thin-film transducers to extend the above method to very small -100 micrograms, fragile samples. The method is calibrated by measuring the elastic constants of a well-characterized material, cubic silicon. Measurements and analyses of several novel materials, including spherical ceramic particles ('proppants') and an aluminum alloy 'quasicrystal', are subsequently presented. Second-order perturbations of the normal mode frequencies due to minor sample preparation errors are also discussed.