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Drinkwater BW, Castaings M, Hosten B. The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface. J Acoust Soc Am. 2003;113(6):3161-70doi: 10.1121/1.1568754.
Drinkwater, B. W., Castaings, M., & Hosten, B. (2003). The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface. The Journal of the Acoustical Society of America, 113(6), 3161-70. https://doi.org/10.1121/1.1568754
Drinkwater, Bruce W, et al. "The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface." The Journal of the Acoustical Society of America vol. 113,6 (2003): 3161-70. doi: https://doi.org/10.1121/1.1568754
Drinkwater BW, Castaings M, Hosten B. The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface. J Acoust Soc Am. 2003 Jun;113(6):3161-70. doi: 10.1121/1.1568754. PMID: 12822788.
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J Acoust Soc Am. 2003 Jun;113(6):3161-70. doi: 10.1121/1.1568754.

The measurement of A0 and S0 lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface.

The Journal of the Acoustical Society of America

Bruce W Drinkwater, Michel Castaings, Bernard Hosten

Affiliations

  1. Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom. [email protected]

PMID: 12822788 DOI: 10.1121/1.1568754

Abstract

Guided waves in an elastic plate surrounded by air propagate with very low attenuation. This paper describes the effect on this propagation of compressively loading an elastomer with high internal damping against one surface of the elastic plate. The propagation of both A0 and S0 Lamb modes is considered. The principal effect is shown to be increased attenuation of the guided waves. This attenuation is caused by leakage of energy from the plate into the elastomer, where it is dissipated due to high viscoelastic damping. It is shown that the increase in attenuation is strongly dependent on the compressive load applied across the solid-solid interface. This interface is represented as a spring layer in a continuum model of the system. Both normal and shear stiffnesses of the interface are quantified from the attenuation of A0 and S0 Lamb waves measured at each step of the compressive loading. The normal stiffness is also measured independently by normal incidence, bulk longitudinal wave ultrasound. The resulting predictions of wave propagation behavior, such as attenuation, obtained by the model are in excellent agreement with those measured experimentally.

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