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Octet lattice-based plate for elastic wave control.

Giulia Aguzzi1, Constantinos Kanellopoulos2, Richard Wiltshaw3

  • 1Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, 8093, Switzerland. aguzzi@ibk.baug.ethz.ch.

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This study explores octet-lattice metastructures for controlling flexural waves in plates. Customized designs enable effective wave mitigation and focusing, offering new possibilities for vibration isolation and energy manipulation.

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Area of Science:

  • * Solid Mechanics
  • * Metamaterials
  • * Acoustics

Background:

  • * Lattice structures are crucial in various scientific and engineering fields.
  • * Metastructures offer unique wave manipulation capabilities, including mitigation and guiding.
  • * Octet-topology lattices provide a foundation for advanced metamaterial designs.

Purpose of the Study:

  • * To numerically investigate flexural wave propagation in octet-lattice metastructures.
  • * To design and analyze metabarriers for wave inhibition and metalenses for wave guiding.
  • * To explore the impact of added masses and variable node thickness on wave phenomena.

Main Methods:

  • * Numerical determination of dispersion curves for octet-lattice arrays.
  • * Design and simulation of metabarriers and metalenses (Luneburg and Maxwell types).
  • * Parametric analysis of added masses and node thickness for graded designs.

Main Results:

  • * A broad bandgap was identified and utilized to create effective metabarriers for wave transmission inhibition.
  • * Graded designs incorporating added masses and variable node thickness enabled wave filtering via rainbow trapping.
  • * Luneburg and Maxwell metalenses successfully steered wavefronts to a focal point.

Conclusions:

  • * Octet-like lattices are versatile for designing advanced metastructures.
  • * The study demonstrates effective wave mitigation and focusing using customized octet designs.
  • * Results offer new perspectives for applications in vibration isolation and energy focusing.