Experimental and numerical study of evanescent waves in the mini stopband of a 1D phononic crystal.

Abstract:

:This paper deals with the analysis of the guided evanescent waves in stopbands of a 1D phononic crystal (PC). A new numerical implementation is shown in order to get the complex values of the wavenumbers in a frequency range where a gap occurs. The considered phononic system is an aluminum plate with a one-dimensional sinusoidal grating. For this structure a mode-gap (mini stopband) occurs at low frequency: it involves the two fundamental Lamb modes A(0) and S(0). The numerical study is performed by using a finite element method (ATILA code). The experiments deal with a finite length grating and evanescent waves are characterized at the vicinity of the mini stopband.

journal_name

Ultrasonics

journal_title

Ultrasonics

authors

Bavencoffe M,Morvan B,Hladky-Hennion AC,Izbicki JL

doi

10.1016/j.ultras.2012.09.009

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

313-9

issue

2

eissn

0041-624X

issn

1874-9968

pii

S0041-624X(12)00179-5

journal_volume

53

pub_type

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