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A design of active elastic metamaterials with negative mass density and tunable bulk modulus

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Abstract

In this paper, a design of active elastic metamaterial that possesses negative density and tunable bulk modulus is presented for the negative refraction of in-plane elastic waves at deep subwavelength scale. The metamaterial is fabricated in an aluminum plate, and the resonant structure in a unit cell of the metamaterial composes of a coated steel that functions as a translational resonator and a radially polarized piezoelectric transducer shunted with negative capacitance. Based on effective continuum theory, the effective mass density and bulk modulus are numerically determined. The passive and active elements work together to generate broad band double-negative material properties. Simulation results verified and demonstrated the negative refraction of elastic waves at the interface between proposed elastic metamaterials and natural solids. The proposed elastic metamaterial may thus be used as a flat lens with broad working frequency regime for in-plane elastic wave focusing.

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Authors and Affiliations

  1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, China

    Sheng Sang & Ziping Wang

  2. Department of Systems Engineering, University of Arkansas at Little Rock, Little Rock, USA

    Sheng Sang & Anwer Mhannawee

Authors
  1. Sheng Sang
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  2. Anwer Mhannawee
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  3. Ziping Wang
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Correspondence to Sheng Sang.

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Sang, S., Mhannawee, A. & Wang, Z. A design of active elastic metamaterials with negative mass density and tunable bulk modulus. Acta Mech 230, 1003–1008 (2019). https://doi.org/10.1007/s00707-018-2320-2

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  • DOI: https://doi.org/10.1007/s00707-018-2320-2

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