Nonlinear phononic crystals based on chains of disks alternating with toroidal structures

We study experimentally the acoustic response of a load-bearing, phononic crystal composed of alternating steel disks and polytetrafluoroethylene o-rings under precompression. The crystal allows for axial, rocking, and shear-polarized wavemodes when excited by a broad band signal applied offaxis. Finite element analysis is employed to determine the system’s wave modes. The nonlinear interaction between disks and o-rings supports a dynamic response that is tunable with variations of static precompression, leading to controllable frequency shifts of a large bandgap. A modal analysis reveals that four of the six principal wave modes are susceptible to external precompression while two modes are not.


Published in:
Applied Physics Letters, 98, 16, 161901-3
Year:
2011
Publisher:
American Institute of Physics
ISSN:
0003-6951
Keywords:
Laboratories:




 Record created 2011-05-02, last modified 2018-03-17

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