Anisotropic acoustic metafluid for underwater operation.

Journal Article (Journal Article)

The paper presents a method to design and characterize mechanically robust solid acoustic metamaterials suitable for operation in dense fluids such as water. These structures, also called metafluids, behave acoustically as inertial fluids characterized by anisotropic mass densities and isotropic bulk modulus. The method is illustrated through the design and experimental characterization of a metafluid consisting of perforated steel plates held together by rubber coated magnetic spacers. The spacers are very effective at reducing the effective shear modulus of the structure, and therefore effective at minimizing the ensuing coupling between the shear and pressure waves inside the solid effective medium. Inertial anisotropy together with fluid-like acoustic behavior are key properties that bring transformation acoustics in dense fluids closer to reality.

Full Text

Duke Authors

Cited Authors

  • Popa, B-I; Wang, W; Konneker, A; Cummer, SA; Rohde, CA; Martin, TP; Orris, GJ; Guild, MD

Published Date

  • June 2016

Published In

Volume / Issue

  • 139 / 6

Start / End Page

  • 3325 -

PubMed ID

  • 27369158

Electronic International Standard Serial Number (EISSN)

  • 1520-8524

International Standard Serial Number (ISSN)

  • 0001-4966

Digital Object Identifier (DOI)

  • 10.1121/1.4950754


  • eng