Method for resonant measurement

Details Method for resonant measurement Method for resonant measurement

1993-06-10

1996-03-05

Noland, Thomas P.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73602, G01H 1300

Patent

active

054957630

ABSTRACT:
A method of measurement of objects to determine object flaws, Poisson's ratio (.sigma.) and shear modulus (.mu.) is shown and described. First, the frequency for expected degenerate responses is determined for one or more input frequencies and then splitting of degenerate resonant modes are observed to identify the presence of flaws in the object. Poisson's ratio and the shear modulus can be determined by identification of resonances dependent only on the shear modulus, and then using that shear modulus to find Poisson's ratio using other modes dependent on both the shear modulus and Poisson's ratio.

REFERENCES:
patent: 5355731 (1994-10-01), Dixon
Visscher, et al., "Vibration of elastic objects", J. Acoust. Soc. Am., vol. 90, No. 4, Pt. 1, Oct. 1991, pp. 2156-2162.

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