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research article

Oligomodal metamaterials with multifunctional mechanics

Bossart, Aleksi  
•
Dykstra, David M. J.
•
van der Laan, Jop
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May 25, 2021
Proceedings Of The National Academy Of Sciences Of The United States Of America (PNAS)

Mechanical metamaterials are artificial composites that exhibit a wide range of advanced functionalities such as negative Poisson's ratio, shape shifting, topological protection, multistability, extreme strength-to-density ratio, and enhanced energy dissipation. In particular, flexible metamaterials often harness zeroenergy deformation modes. To date, such flexible metamaterials have a single property, for example, a single shape change, or are pluripotent, that is, they can have many different responses, but typically require complex actuation protocols. Here, we introduce a class of oligomodal metamaterials that encode a few distinct properties that can be selectively controlled under uniaxial compression. To demonstrate this concept, we introduce a combinatorial design space containing various families of metamaterials. These families include monomodal (i.e., with a single zero-energy deformation mode); oligomodal (i.e., with a constant number of zero-energy deformation modes); and plurimodal (i.e., with many zero-energy deformation modes), whose number increases with system size. We then confirm the multifunctional nature of oligomodal metamaterials using both boundary textures and viscoelasticity. In particular, we realize a metamaterial that has a negative (positive) Poisson's ratio for low (high) compression rate over a finite range of strains. The ability of our oligomodal metamaterials to host multiple mechanical responses within a single structure paves the way toward multifunctional materials and devices.

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Type
research article
DOI
10.1073/pnas.2018610118
Web of Science ID

WOS:000659439900007

Author(s)
Bossart, Aleksi  
Dykstra, David M. J.
van der Laan, Jop
Coulais, Corentin
Date Issued

2021-05-25

Publisher

National Academy of Sciences

Published in
Proceedings Of The National Academy Of Sciences Of The United States Of America (PNAS)
Volume

118

Issue

21

Article Number

e2018610118

Subjects

Multidisciplinary Sciences

•

Science & Technology - Other Topics

•

multifunctional

•

metamaterial

•

viscoelasticity

•

combinatorial

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open-cell foams

•

transition waves

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behavior

•

shape

•

pathways

•

design

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LWE  
Available on Infoscience
July 3, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/179610
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