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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Sound absorption by a metasurface comprising hard spheres in a soft medium
Alex Skvortsov1, Gyani Shankar Sharma2, Ian MacGillivray1
1Maritime Division, Defence Science and Technology, Melbourne, Australia.
The Journal of the Acoustical Society of America
|September 2, 2021
Summary
This study introduces a new theoretical framework for acoustic wave propagation in metasurfaces. The model accurately predicts wave behavior in soft elastic materials with embedded inclusions, validated by numerical simulations.
Area of Science:
- Acoustics
- Materials Science
- Solid Mechanics
Background:
- Metasurfaces offer unique acoustic wave manipulation capabilities.
- Understanding wave propagation in soft elastic materials with inclusions is crucial for advanced acoustic applications.
Purpose of the Study:
- To develop a theoretical framework for acoustic wave propagation in a hexagonal lattice metasurface.
- To model the effective properties of homogenized layers within the metasurface.
- To incorporate multiple scattering effects using an analogy with creeping flow dynamics.
Main Methods:
- Approximation of inclusion layers as homogenized layers with effective properties.
- Implementation of an analogy between fluid dynamics (creeping flows) and elastodynamics of soft materials.
- Analytical derivation of acoustic wave propagation characteristics.
Main Results:
- The theoretical framework accurately describes acoustic wave propagation in the specified metasurface.
- Analytical results show excellent agreement with numerical simulations.
- The model effectively accounts for multiple scattering in resonant inclusions.
Conclusions:
- The developed theoretical framework provides a reliable method for analyzing acoustic wave propagation in soft elastic metasurfaces.
- The homogenization and fluid dynamics analogy approach is validated for predicting metasurface acoustic behavior.
- This work contributes to the design and application of advanced acoustic materials.
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