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Composite hexagonal pentamode acoustic metamaterials with tailored properties.

Qi Li^1,2, Mingquan Zhang¹

¹Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian, 116026, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|September 2, 2020

Summary

This study introduces composite pentamode metamaterials for advanced acoustic cloaking. These engineered materials offer tunable properties for novel acoustic wave manipulation.

Keywords:

composite structures hexagonal unit cell pentamode metamaterials phononic band structures tailored properties

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Area of Science:

Acoustic Metamaterials
Solid Mechanics
Wave Physics

Background:

Acoustic metamaterials are engineered materials with unique wave manipulation capabilities beyond natural limits.
Pentamode metamaterials, a subclass, exhibit fluid-like behavior despite solid structures, enabling applications like acoustic cloaking.
Existing designs lack sufficient tunability for complex acoustic control.

Purpose of the Study:

To propose and analyze composite pentamode metamaterials utilizing hexagonal unit cells.
To investigate the phononic band structures and anisotropic properties of these novel metamaterials.
To explore the influence of geometric and material parameters on effective properties for tailored acoustic control.

Main Methods:

Design and simulation of composite pentamode metamaterials with hexagonal unit cells.
Analysis of phononic band structures to identify band gaps supporting only compressional modes.
Systematic variation of geometric dimensions and constituent materials to study property modulation.

Main Results:

Phononic band structures reveal band gaps where only compressional acoustic modes propagate.
Structural variations enable the achievement of highly anisotropic material properties.
Geometric dimensions and material choices significantly influence the effective acoustic properties.

Conclusions:

Composite pentamode metamaterials offer enhanced design flexibility for acoustic wave control.
The proposed hexagonal unit cell structures provide a pathway to achieve desired anisotropic characteristics.
These findings pave the way for developing sophisticated acoustic cloaking and manipulation devices.