This paper reports a comprehensive modeling and experimental characterization of a three-dimensional phononic crystal composed of a single material, endowed with an ultra-wide complete bandgap. The phononic band structure shows a gap-mid gap ratio of 132% that is by far the greatest full 3D bandgap in literature for any kind of phononic crystals. A prototype of the finite crystal structure has been manufactured in polyamide by means of additive manufacturing technology and tested to assess the transmission spectrum of the crystal. The transmission spectrum has been numerically calculated taking into account a frequency-dependent elastic modulus and a Rayleigh model for damping. The measured and numerical transmission spectra are in good agreement and present up to 75 dB of attenuation for a three-layer crystal.
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28 November 2016
Research Article|
December 02 2016
Modeling and experimental verification of an ultra-wide bandgap in 3D phononic crystal
L. D'Alessandro;
L. D'Alessandro
1Department of Civil and Environmental Engineering,
Politecnico di Milano
, Milano 20133, Italy
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E. Belloni
;
E. Belloni
a)
2Department of Mechanical Engineering,
Politecnico di Milano
, Milano 20156, Italy
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R. Ardito;
R. Ardito
1Department of Civil and Environmental Engineering,
Politecnico di Milano
, Milano 20133, Italy
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A. Corigliano;
A. Corigliano
1Department of Civil and Environmental Engineering,
Politecnico di Milano
, Milano 20133, Italy
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F. Braghin
F. Braghin
2Department of Mechanical Engineering,
Politecnico di Milano
, Milano 20156, Italy
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a)
Electronic mail: edoardo.belloni@polimi.it
Appl. Phys. Lett. 109, 221907 (2016)
Article history
Received:
August 10 2016
Accepted:
November 17 2016
Citation
L. D'Alessandro, E. Belloni, R. Ardito, A. Corigliano, F. Braghin; Modeling and experimental verification of an ultra-wide bandgap in 3D phononic crystal. Appl. Phys. Lett. 28 November 2016; 109 (22): 221907. https://doi.org/10.1063/1.4971290
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