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Highly anisotropic elements for acoustic pentamode applications.

Christopher N Layman1, Christina J Naify, Theodore P Martin

  • 1National Research Council, Washington, DC 20001, USA. christopher.layman.ctr@nrl.navy.mil

Physical Review Letters
|July 30, 2013
PubMed
Summary
This summary is machine-generated.

Pentamode metamaterials, acoustic metafluids with tunable stiffness, are designed using an oblique honeycomb lattice. This enables highly anisotropic acoustic properties for advanced applications.

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Pentamode metamaterials are acoustic metafluids.
  • They exhibit anisotropic stiffness and isotropic mass density.
  • This allows them to mimic other fluid domains.

Purpose of the Study:

  • To present a novel pentamode metamaterial design.
  • To achieve customizable anisotropic acoustic properties.
  • To explore applications in transformation acoustics.

Main Methods:

  • Design of a pentamode metamaterial using an oblique honeycomb lattice.
  • Characterization of the material's anisotropic stiffness and isotropic mass density.
  • Analysis of the tunable properties for acoustic applications.

Main Results:

  • The oblique honeycomb lattice design produces customizable anisotropic properties.
  • Anisotropy in stiffness can exceed three orders of magnitude.
  • The material's properties are suitable for transformation acoustics.

Conclusions:

  • The proposed pentamode metamaterial offers significant control over acoustic properties.
  • This design provides a pathway for realizing advanced acoustic devices.
  • Customizable anisotropy opens new possibilities in transformation acoustics.