Attenuation of Lamb waves in the vicinity of a forbidden band in a phononic crystal.
When a Lamb wave propagates on a plate engraved by a periodic grating, it may exhibit attenuation. This attenuation is related to a coupling of this incident mode with other propagating modes. As the propagation takes place in a periodic medium, the dispersion curves of the modes are of interest because they exhibit passbands and stopbands related to the geometry of the waveguide. The goal of this work is to quantitatively establish the relation between the value of the attenuation of the propagating waves and the width of the forbidden bands appearing inside the Brillouin zone. This study is performed by using a finite element method (ATILA code).
Bavencoffe
Maxime
M
Laboratoire Ondes et Milieux Complexes, FRE-3102 CNRS, Groupe Ondes Acoustiques, University of Le Havre, France. maxime.bavencoffe@univ-lehavre.fr
Hladky-Hennion
Anne-Christine
AC
Morvan
Bruno
B
Izbicki
Jean-Louis
JL