Journal
NDT & E INTERNATIONAL
Volume 38, Issue 7, Pages 554-560Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2005.01.010
Keywords
ultrasonic evaluation; vibration; elastic moduli; resonant ultrasound spectroscopy; sphere
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Resonant ultrasound spectroscopy (RUS) is based on the principle that mechanical resonant response of solids depends on its elastic moduli, shape and density. Elastic moduli or the other properties can be identified from resonant frequencies as inverse problem. In this study, the method to determine elastic moduli of a spherical specimen without information of resonant mode was described. We confirmed that resonant frequencies have to be measured under condition of free surface, and adequate number of resonant frequencies used in calculation needs enough number to include the sensitive mode to Poisson's ratio. By this method, we determined elastic moduli of BK-7 glass. The calculated frequencies from the elastic moduli determined by this technique had good agreement with the measured, the absolute accuracies for the Delta f was less than 0.4%. (c) 2005 Elsevier Ltd. All rights reserved.
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