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Updated: May 9, 2026

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
Published on: June 28, 2024
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
Abstract:
Pentamode metamaterials are a class of acoustic metafluids that are characterized by a divergence free modified stress tensor. Such materials have an unconventional anisotropic stiffness and isotropic mass density, which allow themselves to mimic other fluid domains. Here we present a pentamode design formed by an oblique honeycomb lattice and producing customizable anisotropic properties. It is shown that anisotropy in the stiffness can exceed 3 orders of magnitude, and that it can be realistically tailored for transformation acoustic applications.
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