Bulk shear wave propagation in an epoxy: attenuation and phase velocity over five decades of frequency

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Yujie WangMarion E Unwin

Abstract

Proportionality between the ultrasonic wave attenuation coefficient in epoxies and other polymers and frequency is a commonly observed but little understood phenomenon. How it is ultimately explained will depend on the breadth of the frequency range over which it is significant. This paper presents results of experiments to measure loss in a single epoxy material over 5 decades of frequency using 4 complementary techniques--dynamic mechanical analysis, microwave excited low-frequency resonances, a novel guidedwave technique based on a metal-epoxy-metal sandwich, and a conventional pulse mode ultrasonic spectrometer. The results are confined to bulk shear waves in the epoxy. They confirm the linear relationship between attenuation and frequency, and it is shown that the broadband behavior of the attenuation and shear wave phase velocity is consistent with the Kramers- Kronig relationships.

References

Jul 26, 2003·The Journal of the Acoustical Society of America·F Simonetti, P Cawley
Dec 31, 2005·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Alexander N Kalashnikov, Richard E Challis
Feb 2, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·C D Todd, R E Challis
Jul 4, 2009·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Richard E ChallisXiaoning Guo

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Citations

Jan 10, 2012·The Journal of the Acoustical Society of America·Jean-Gabriel MinonzioPascal Laugier

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