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
Ultrasonicsjournal_title
Ultrasonicsauthors
Bavencoffe M,Morvan B,Hladky-Hennion AC,Izbicki JLdoi
10.1016/j.ultras.2012.09.009subject
Has Abstractpub_date
2013-02-01 00:00:00pages
313-9issue
2eissn
0041-624Xissn
1874-9968pii
S0041-624X(12)00179-5journal_volume
53pub_type
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