Lattice Metamaterials with Mechanically Tunable Poisson’s Ratio for Vibration Control

Yanyu Chen, Tiantian Li, Fabrizio Scarpa, Lifeng Wang

Research output: Contribution to journalArticle (Academic Journal)peer-review

142 Citations (Scopus)
858 Downloads (Pure)

Abstract

Metamaterials with artificially designed architectures are increasingly considered as new paradigmatic material systems with novel physical properties. Here we report a class of architected lattice metamaterials with mechanically tunable negative Poisson’s ratios and vibration mitigation capability. The proposed lattice metamaterials are built by replacing regular straight beams with sinusoidally shaped ones, which are highly stretchable under uniaxial tension. Our experimental and numerical results indicate that the proposed lattices exhibit extreme Poisson’s ratios variations between -0.7 and 0.5 over large tensile deformations up to 50%. This large variation of Poisson’s ratio values is attributed to the deformation pattern switching from bending to stretch within the sinusoidally shaped beams. The interplay between the multiscale (ligament and cell) architecture and wave propagation also enables remarkable broadband vibration mitigation capability of the lattice metamaterials, which can be dynamically tuned by an external mechanical stimulus. The material design strategy provides new insights into the development of classes of architected metamaterials with potential applications including energy absorption, tunable acoustics, vibration control, responsive devices, soft robotics, and stretchable electronics.
Original languageEnglish
Article number024012
Number of pages11
JournalPhysical Review Applied
Volume7
Issue number2
Early online date9 Feb 2017
DOIs
Publication statusPublished - Feb 2017

Keywords

  • lattice material
  • metamaterials
  • auxetic
  • negative Poisson’s ratio
  • band gaps

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