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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Guiding near-source elastic waves in a semi-infinite medium.

Kemeng Cui1, Zhao-Dong Xu1, Antonio Palermo2

  • 1China-Pakistan Belt and Road Joint Laboratory on Smart Disaster Prevention of Major Infrastructures, School of Civil Engineering, Southeast University , Nanjing 211189, People's Republic of China.

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Summary
This summary is machine-generated.

Researchers developed elastic metamaterials that steer bulk waves using phase discontinuities. This innovation enables precise control over wave propagation for applications like vibration isolation and energy harvesting.

Keywords:
elastic wave manipulationgeneralized Snell’s lawmetamaterialswavefront modulation

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Area of Science:

  • Solid mechanics
  • Materials science
  • Acoustics

Background:

  • Elastic metamaterials offer unique wave manipulation capabilities.
  • Controlling bulk wave propagation in semi-infinite media presents significant challenges.

Purpose of the Study:

  • To propose and demonstrate elastic metamaterials with phase discontinuities for steering near-source bulk waves.
  • To achieve wavefront manipulation for directional refraction and energy focusing.

Main Methods:

  • Design of subwavelength resonators with tailored masses to achieve a complete phase shift.
  • Utilizing dispersion diagrams and the generalized Snell's law.
  • Employing a multiple scattering formulation for analytical demonstration.

Main Results:

  • Successful demonstration of wavefront manipulation through tailored phase discontinuities.
  • Achieved diverse wave functionalities including directional refraction and energy focusing.
  • Validated the effectiveness of the proposed metamaterial design.

Conclusions:

  • The proposed elastic metamaterials effectively steer bulk wave propagation.
  • This design offers potential advancements in guiding elastic waves.
  • Applications include ground-borne vibration isolation and energy harvesting.