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Published on: September 2, 2011
Effects of the interface roughness in metal-adhesive-metal structure on the propagation of shear horizontal waves
Mounsif Ech Cherif El Kettani1, Damien Leduc1, Catherine Potel2
1Laboratoire Ondes et Milieux Complexes, Unité Mixte de Recherche CNRS 6294, University of Normandy, Le Havre, France.
Abstract:
The influence of the interface roughness in a three-layer metal-adhesive-metal structure on the propagation of shear horizontal waves and more particularly on the transmission coefficient versus the frequency is studied in the particular case of a periodic grating of triangular grooves. For given phonon frequencies, the interaction of an incident shear horizontal mode with the periodical grating gives rise to a retro-converted mode. A numerical finite element simulation permits us to predict the existence of the phonon mode in the three-layer structure and to obtain the evolution of the transmission coefficient around the phonon frequency. An experimental study, based on a generation of waves by a piezocomposite contact transducer and a reception by a laser vibrometer, then confirms these predictions. Finally, a parametric numerical study is performed: the influence of the depth of the roughness and of the number of spatial periods of the grooves on the transmission coefficient is studied.
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