Theoretical analysis of damping effects of guided elastic waves at solid/fluid interfaces

Sylvain Ballandras (1) , Alexandre Reinhardt (1) , Abdelkrim Khelif (1) , Mikael Wilm (1) , Vincent Laude (1) , William Daniau (1) , Virginie Blondeau-Patissier (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

A theoretical description of ideal and viscous fluid media is proposed to address the problem of modeling damping effects of surface acoustic waves and more generally of any guided elastic waves at the interface between viscous fluids and solids. It is based on the Fahmy-Adler eigenvalue representation of the elastic propagation problem, adapted to provide Green's function of the considered media. It takes advantage of previous efforts developed to numerically stabilize Green's-function computation process. This function is used to compute a harmonic admittance according to the Blötekjaër approach. The influence of acoustic radiation and viscosity effects on different kinds of waves excited on various substrates is reported and discussed.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Sylvain Ballandras, Alexandre Reinhardt, Abdelkrim Khelif, Mikael Wilm, Vincent Laude, et al.. Theoretical analysis of damping effects of guided elastic waves at solid/fluid interfaces. Journal of Applied Physics, 2006, 99, pp.054907. ⟨10.1063/1.2168242⟩. ⟨hal-00073046⟩