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Updated: Nov 27, 2025

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
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Two-component versus three-component metasolids.

Elie Favier1, Navid Nemati1, Camille Perrot1

  • 1MSME, Univ Gustave Eiffel, CNRS UMR 8208, Univ Paris-Est Créteil, F-77454 Marne-la-Vallée, France.

The Journal of the Acoustical Society of America
|December 2, 2020
PubMed
Summary
This summary is machine-generated.

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Researchers analyzed composite metasolids, finding that adding a rigid mass enhances tunability for low-frequency sound and vibration insulation. This design offers a broader bandwidth for metamaterial effects.

Area of Science:

  • Composite Materials
  • Metamaterials
  • Acoustic Metamaterials

Background:

  • Metasolids, composed of inclusions within a matrix, can exhibit unique properties like negative mass density.
  • Existing metasolids with single inclusions show negative mass density near local-resonance frequencies.

Purpose of the Study:

  • To analytically compare metamaterial properties of two composite metasolid types.
  • To investigate how modifying inclusion composition affects homogenized properties and tunability.
  • To design low-frequency sound and vibration insulation using enhanced metamaterial effects.

Main Methods:

  • Employed analytic analysis and parametric investigation.
  • Utilized a unified formulation to study cylindrical and spherical inclusions.

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  • Applied a simplified mass-spring model for inverse problem design.

    • Main Results:

    • Demonstrated that bi-inclusion metasolids (elastic inclusion with a rigid core) significantly alter homogenized properties compared to mono-inclusion types.
    • Showed increased tunability of local-resonance frequencies and metamaterial-effect bandwidth by adding a rigid mass.
    • Identified a low-frequency metamaterial effect with a larger bandwidth for sound and vibration insulation.

    Conclusions:

    • Modifying inclusion structure in composite metasolids offers enhanced control over material properties.
    • Bi-inclusion designs provide greater tunability for metamaterial applications, particularly in vibration and sound insulation.
    • The study provides a pathway for designing effective low-frequency acoustic metamaterials.