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Simonetti F, Cawley P. A guided wave technique for the characterization of highly attenuative viscoelastic materials. J Acoust Soc Am. 2003;114(1):158-65doi: 10.1121/1.1575749.
Simonetti, F., & Cawley, P. (2003). A guided wave technique for the characterization of highly attenuative viscoelastic materials. The Journal of the Acoustical Society of America, 114(1), 158-65. https://doi.org/10.1121/1.1575749
Simonetti, F, and Cawley, P. "A guided wave technique for the characterization of highly attenuative viscoelastic materials." The Journal of the Acoustical Society of America vol. 114,1 (2003): 158-65. doi: https://doi.org/10.1121/1.1575749
Simonetti F, Cawley P. A guided wave technique for the characterization of highly attenuative viscoelastic materials. J Acoust Soc Am. 2003 Jul;114(1):158-65. doi: 10.1121/1.1575749. PMID: 12880029.
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J Acoust Soc Am. 2003 Jul;114(1):158-65. doi: 10.1121/1.1575749.

A guided wave technique for the characterization of highly attenuative viscoelastic materials.

The Journal of the Acoustical Society of America

F Simonetti, P Cawley

Affiliations

  1. Department of Mechanical Engineering, Imperial College, London SW7 2AZ, United Kingdom.

PMID: 12880029 DOI: 10.1121/1.1575749

Abstract

The measurement of the acoustic properties of highly attenuative materials such as bitumen is very difficult. One possibility is to use measurements of the extent to which filling a cylindrical waveguide with the material affects the dispersion relationship of the cylinder. Torsional modes have been excited using piezoelectric transducers placed at one end of the cylinder, while the phase velocity and attenuation spectra have been measured by means of laser scanning. At each frequency, under the hypothesis of linear viscoelasticity, the phase velocity and attenuation of the fundamental torsional mode have been calculated as a function of the bulk shear velocity and the bulk shear attenuation of the inner core at that frequency. The resulting phase velocity and guided wave attenuation contour plots have been employed for deriving the unknown shear properties from the measured velocity and attenuation of the guided wave. The monochromaticity of the approach has not required a particular frequency dependence of the material properties to be assumed. Results for bitumen are given.

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