Rainbow trapping of torsional waves in a chirped rectangular beam (INVITED)

Abstract eng:
This work presents the demonstration of the rainbow trapping effect for torsional waves propagating in an aluminum beam with rectangular cross section. The beam contains a chirped structure that is machined with notches separated with the rule 7t: (aj-aj,1)/aj, where aj is the size of the cavity defined between notches j-l and j, and xi is the chirp intensity parameter. We have observed the temporarily trapping of waves at positions in the beam that depend of the central frequency of the wave packet. This demonstration for torsional waves is encouraging and opens the possibility of its extension to more complex elastic waves.

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