Harnessing fractal cuts to design robust lattice metamaterials for energy dissipation

Zhennan Zhang, Fabrizio Scarpa, Brett A Bednarcyk, Yanyu Chen*

*Corresponding author for this work

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

Abstract

Lattice metamaterials exhibit remarkable mechanical properties and novel functionalities, such as high specific stiffness, fracture toughness, tunable vibroacoustic properties, and energy absorption. This study explores a group of lattice metamaterials with fractal cuts that feature energy dissipation via structural sliding friction mechanisms and intrinsic material damping. Lattice metamaterials with three types of fractal cuts patterns were designed and fabricated using additive manufacturing. Three-point bending tests and numerical analysis have been combined to investigate their bending behavior. Experimental results show that the structural bending compliance of the metamaterials can be sharply enhanced by increasing the fractal orders, while at the same time keeping the shape recoverability during cyclic loading. Loss factors associated with the cyclic bending of these metamaterials are almost independent of the fractal order used, which is attributed to the synergistic effect between friction and viscoelasticity. It is further demonstrated via validated finite element models that the sliding friction plays a critical role by investigating the effects of the bending displacement and sample thickness on the flexural behavior. Results suggest that the magnitude of the maximum bending displacement has a negligible effect on the loss factors, and a power scaling law exists between bending stiffness and sample thickness. This study suggests that fractal lattice metamaterials have unique energy dissipation properties, with potential applications in many industrial sectors such as defense, energy, and transportation.
Original languageEnglish
Article number102126
Number of pages10
JournalAdditive Manufacturing
Volume46
Early online date24 Jun 2021
DOIs
Publication statusE-pub ahead of print - 24 Jun 2021

Bibliographical note

Funding Information:
YC gratefully acknowledges the NASA KY Space Grant and the start-up fund from the Department of Mechanical Engineering at the University of Louisville. FS acknowledges the support of the Faculty of Engineering of the University of Bristol. The National Aeronautics & Space Administration ( NASA ), (No: 3200003095-21-068 ).

Funding Information:
YC gratefully acknowledges the NASA KY Space Grant and the start-up fund from the Department of Mechanical Engineering at the University of Louisville. FS acknowledges the support of the Faculty of Engineering of the University of Bristol. The National Aeronautics & Space Administration (NASA), (No: 3200003095-21-068).

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

  • metamaterials
  • fractal
  • friction
  • energy dissipation
  • 3D printing

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