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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Metamaterials for simultaneous acoustic and elastic bandgaps
Waiel Elmadih1,2, Dimitrios Chronopoulos3,4, Jian Zhu5
1Institute for Aerospace Technology & The Composites Group, University of Nottingham, Nottingham, NG8 1BB, UK. Waiel.Elmadih1@nottingham.ac.uk.
Scientific Reports
|July 20, 2021
Summary
This study introduces a novel metamaterial capable of simultaneously blocking both acoustic and elastic waves. This breakthrough offers efficient, space-saving wave attenuation for diverse engineering applications.
Area of Science:
- Acoustic and Elastic Metamaterials
- Wave Propagation and Attenuation
- Materials Science and Engineering
Background:
- Simultaneous attenuation of acoustic and elastic waves is crucial for noise and vibration control in various engineering fields.
- Existing solutions often require bulky or multiple specialized materials, leading to space and weight inefficiencies.
- Metamaterials offer a promising avenue for achieving multi-domain wave manipulation with tailored properties.
Purpose of the Study:
- To design and demonstrate a single, low-profile metamaterial exhibiting simultaneous bandgaps for acoustic and elastic waves.
- To investigate the influence of geometric parameters on the metamaterial's acoustic and elastic wave attenuation capabilities.
- To validate the numerical predictions through experimental measurements of a fabricated metamaterial prototype.
Main Methods:
- Acoustic and elastic wave propagation through a specifically designed metamaterial was simulated by ensuring impedance mismatch in fluid and solid domains.
- Dispersion curves were calculated for various metamaterial designs (varying diameters and neck lengths) to determine acoustic and elastic bandgaps.
- A representative metamaterial sample was fabricated using laser powder bed fusion and its dynamic performance was experimentally evaluated using a dynamic shaker setup.
Main Results:
- The metamaterial demonstrated simultaneous bandgaps, effectively attenuating acoustic waves below 5 kHz and elastic waves below 10 kHz.
- Simulation results showed good agreement with experimental measurements, validating the metamaterial's performance.
- Key geometric parameters (diameter, neck length) were identified as effective means for tuning both acoustic and elastic bandgaps.
Conclusions:
- A single, low-profile metamaterial effectively achieves simultaneous acoustic and elastic wave attenuation.
- The developed metamaterial offers significant advantages in space and material savings for applications in construction, automotive, and aerospace industries.
- The design methodology and experimental validation provide a robust framework for future development of multi-functional metamaterials.
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