Composite 3D-printed metastructures for lowfrequency and broadband vibration absorption

Kathryn H. Matlack, Anton Bauhofer, Sebastian Krödel, Antonio Palermo, Chiara Daraio

Research output: Contribution to journalArticlepeer-review

Abstract

Architected materials that control elastic wave propagation are essential in vibration mitigation and sound attenuation. Phononic crystals and acoustic metamaterials use band-gap engineering to forbid certain frequencies from propagating through a material. However, existing solutions are limited in the low-frequency regimes and in their bandwidth of operation because they require impractical sizes and masses. Here, we present a class of materials (labeled elastic metastructures) that supports the formation of wide and low-frequency band gaps, while simultaneously reducing their global mass. To achieve these properties, the metastructures combine local resonances with structural modes of a periodic architected lattice. Whereas the band gaps in these metastructures are induced by Bragg scattering mechanisms, their key feature is that the band-gap size and frequency range can be controlled and broadened through local resonances, which are linked to changes in the lattice geometry. We demonstrate these principles experimentally, using advanced additive manufacturing methods, and inform our designs using finite-element simulations. This design strategy has a broad range of applications, including control of structural vibrations, noise, and shock mitigation.

Original languageEnglish (US)
Pages (from-to)8386-8390
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume113
Issue number30
DOIs
StatePublished - Jul 26 2016

Keywords

  • 3D printing
  • Band gaps
  • Metamaterials
  • Phononic crystals
  • Vibration absorption

ASJC Scopus subject areas

  • General

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