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A method for the measurement of the shear properties of solid viscoelastic materials is presented. The viscoelastic material is cut into a cylindrical sample which is clamped between two rods. The transmission and reflection coefficient spectra of the fundamental torsional mode through the sample are measured by means of two pairs of piezoelectric transducers placed at the free ends of the rod-sample-rod system. Such spectra exhibit maxima and minima which occur approximately at the resonance frequencies of the free viscoelastic cylinder. Therefore, the shear velocity can be obtained by measuring the frequency interval between two consecutive maxima or minima. The shear attenuation is derived by best fitting the analytical expression of the reflection and transmission coefficients to the experimental spectra. The test is very quick to set up as the sample is simply clamped between the two rods. © 2004 Acoustical Society of America.

@article{simonetti_ultrasonic_2004, title = {Ultrasonic interferometry for the measurement of shear velocity and attenuation in viscoelastic solids}, volume = {115}, copyright = {© 2004 Acoustical Society of America}, url = {http://link.aip.org/link/?JAS/115/157/1}, doi = {10.1121/1.1631944}, abstract = {A method for the measurement of the shear properties of solid viscoelastic materials is presented. The viscoelastic material is cut into a cylindrical sample which is clamped between two rods. The transmission and reflection coefficient spectra of the fundamental torsional mode through the sample are measured by means of two pairs of piezoelectric transducers placed at the free ends of the rod-sample-rod system. Such spectra exhibit maxima and minima which occur approximately at the resonance frequencies of the free viscoelastic cylinder. Therefore, the shear velocity can be obtained by measuring the frequency interval between two consecutive maxima or minima. The shear attenuation is derived by best fitting the analytical expression of the reflection and transmission coefficients to the experimental spectra. The test is very quick to set up as the sample is simply clamped between the two rods. © 2004 Acoustical Society of America.}, number = {1}, urldate = {2012-09-28TZ}, journal = {The Journal of the Acoustical Society of America}, author = {Simonetti, F. and Cawley, P.}, year = {2004}, keywords = {acoustic wave interferometry, ultrasonic absorption, ultrasonic reflection, ultrasonic transmission, viscoelasticity}, pages = {157--164} }

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