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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.
Scientific Reports
|January 21, 2022
Summary
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.
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.
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