Back
Full-text
Journal article

Composite 3D-printed metastructures for low-frequency and broadband vibration absorption.

  • Matlack KH Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zurich, Switzerland; matlackk@ethz.ch.
  • Bauhofer A Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zurich, Switzerland;
  • Krödel S Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zurich, Switzerland;
  • Palermo A Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zurich, Switzerland; Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, 40126 Bologna, Italy.
  • Daraio C Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zurich, Switzerland;
  • 2016-07-14
Published in:
  • Proceedings of the National Academy of Sciences of the United States of America. - 2016
3D printing
band gaps
metamaterials
phononic crystals
vibration absorption
English 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.
Language
  • English
Open access status
bronze
Identifiers
Persistent URL
https://sonar.ch/global/documents/277253
Statistics
Document views: 36 File downloads:
  • Full-text: 0