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Deeply subwavelength giant monopole elastodynamic metacluster resonators.
Philip A Cotterill1, David Nigro2, William J Parnell1
1Department of Mathematics, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Proceedings. Mathematical, Physical, and Engineering Sciences
|July 11, 2022
Summary
Interaction between nearby voids significantly alters acoustic material properties. By arranging voids into metaclusters, researchers can tune resonance frequency, scattering, and directionality for novel material design.
Area of Science:
- Acoustic metamaterials
- Solid mechanics
- Materials science
Background:
- Giant monopole resonance is key to tuning composite materials with voids.
- Low-frequency resonance in elastomers has been exploited for decades.
- The effect of void interaction on resonance is not well understood.
Purpose of the Study:
- Investigate how void proximity affects monopole resonance.
- Explore void configuration's impact on acoustic properties.
- Demonstrate tunable resonance through void metaclusters.
Main Methods:
- Analyzed planar elastodynamics of circular cylindrical voids.
- Studied near-field shear coupling effects.
- Investigated void metaclusters with varying numbers and configurations.
Main Results:
- Near-field shear coupling significantly modifies monopole resonance.
- Void metaclusters allow tailoring of directionality, scattering amplitude, and resonant frequency.
- Metaclusters exhibit lower resonant frequencies than single voids, e.g., nearly 16% reduction for two touching voids.
Conclusions:
- Void interaction and configuration are critical for acoustic response.
- Metaclusters offer a novel approach to designing elastic materials with tailored dynamic properties.
- This work opens avenues for creating advanced acoustic metamaterials.
