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Nature-inspired designs for disordered acoustic bandgap materials
1Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Soft Matter
|October 20, 2023
Summary
Bio-inspired amorphous metamaterials create tunable acoustic bandgaps. These defect-tolerant, isotropic bandgaps offer new possibilities for vibration isolation and mechanical waveguides.
Area of Science:
- Materials Science
- Mechanical Engineering
- Acoustics
Background:
- Cell packing in biological tissues exhibits spatial stiffness heterogeneity.
- This heterogeneity influences biological tissue mechanics and cancer invasion.
- Bio-inspired designs can lead to novel mechanical metamaterials.
Purpose of the Study:
- To design and investigate amorphous mechanical metamaterials inspired by cellular packing.
- To explore the creation of tunable acoustic bandgaps in these bio-inspired structures.
- To demonstrate the isotropic and defect-robust nature of these bandgaps.
Main Methods:
- Constructing amorphous metamaterials using a bio-inspired design template.
- Analyzing the impact of local stiffness heterogeneity on acoustic properties.
- Calculating transmission coefficients under dynamic sinusoidal wave perturbations.
- Investigating bandgap manipulation via elastic modulus and stiffness heterogeneity.
Main Results:
- Amorphous cellular solids exhibit large, tunable acoustic bandgaps.
- Bandgaps are directionally isotropic and robust to defects due to lack of positional order.
- Transmission coefficient valleys confirm the existence and location of bandgaps.
Conclusions:
- The bio-inspired metamaterial design enables the engineering of self-assembled acoustic structures.
- Acoustic bandgaps can be controlled through mechanical tuning.
- Potential applications include vibration isolation and mechanical waveguides.
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