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Crystals 2019, 9(3), 121; https://doi.org/10.3390/cryst9030121

Elastic Wave Propagation of Two-Dimensional Metamaterials Composed of Auxetic Star-Shaped Honeycomb Structures

1
Department of Mechanical Engineering, National Cheng Kung University, University Road, Tainan City 701, Taiwan
2
Department of Digital Design and Information Management Chung Hwa University of Medical Technology, Tainan City 717, Taiwan
*
Author to whom correspondence should be addressed.
Received: 29 January 2019 / Revised: 18 February 2019 / Accepted: 25 February 2019 / Published: 26 February 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
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Abstract

In this paper, the wave propagation in phononic crystal composed of auxetic star-shaped honeycomb matrix with negative Poisson’s ratio is presented. Two types of inclusions with circular and rectangular cross sections are considered and the band structures of the phononic crystals are also obtained by the finite element method. The band structure of the phononic crystal is affected significantly by the auxeticity of the star-shaped honeycomb. Some other interesting findings are also presented, such as the negative refraction and the self-collimation. The present study demonstrates the potential applications of the star-shaped honeycomb in phononic crystals, such as vibration isolation and the elastic waveguide. View Full-Text
Keywords: phononic crystal; auxetic structure; star-shaped honeycomb structure; wave propagation phononic crystal; auxetic structure; star-shaped honeycomb structure; wave propagation
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Chang, S.-Y.; Chen, C.-D.; Yeh, J.-Y.; Chen, L.-W. Elastic Wave Propagation of Two-Dimensional Metamaterials Composed of Auxetic Star-Shaped Honeycomb Structures. Crystals 2019, 9, 121.

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