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Updated: Nov 30, 2025

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Metafluids beyond the Bulk Modulus.

Fengming Liu¹, Ziyu Wang², Manzhu Ke³

¹School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China.

Physical Review Letters

|November 16, 2020

Summary

This summary is machine-generated.

Researchers have discovered metafluids, a type of fluid metamaterial, exhibiting a novel "shearlike modulus." This new parameter, alongside tunable density and bulk modulus, expands the capabilities of acoustic metamaterials.

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Area of Science:

Acoustic metamaterials
Fluid dynamics
Materials science

Background:

Acoustic properties of fluids are defined by mass density and bulk modulus.
Metafluids are fluid metamaterials that allow for extreme or negative values of these parameters.

Purpose of the Study:

To investigate the acoustic properties of metafluids composed of periodic thin-walled hollow cylinders.
To explore the potential for new effective parameters beyond conventional mass density and bulk modulus.

Main Methods:

Generalizing effective medium theory (EMT) to include second-order effects.
Analyzing the response of metafluids to the quadrupolar component of waves.
Incorporating quadrupolar resonances within the metafluid structure.

Main Results:

Metafluids exhibit designable effective mass density and bulk modulus.
A novel effective parameter, analogous to a solid's shear modulus, is identified.
This parameter arises from second-order effects and quadrupolar resonances, which are typically neglected.

Conclusions:

The discovery of metafluids with shearlike moduli extends the concept of fluid metamaterials.
This work significantly advances the field of metamaterials by introducing a new design parameter.
The findings have implications for controlling and manipulating acoustic waves in fluids.