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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Composite acoustic medium with simultaneously negative density and modulus.

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This study presents a novel acoustic metamaterial with a wide double-negative range, enabling transparency for low frequencies and potential applications in white light technologies.

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Acoustic metamaterials offer unique wave manipulation properties.
  • Designing metamaterials with broad functional frequency ranges is a key challenge.

Purpose of the Study:

  • To fabricate and characterize a novel acoustic composite metamaterial.
  • To investigate its acoustic properties, including transmission, effective density, and phase velocity.
  • To explore the potential of this metamaterial for white light applications.

Main Methods:

  • Fabrication of a periodic acoustic composite structure with interspaced membranes and side holes.
  • Experimental measurement of acoustic transmission, effective density, and phase velocity.
  • Analysis of the system's behavior around critical frequencies omega{SH} and omega{c}.

Main Results:

  • The metamaterial exhibits distinct frequency ranges with unique properties.
  • A wide double-negative (negative permittivity and permeability) spectral range was observed below omega{SH}.
  • The system demonstrated transparency below omega{SH} and above omega{c}, with opacity and negative density in between.

Conclusions:

  • The fabricated acoustic metamaterial possesses a broad double-negative spectral range.
  • This wide operational bandwidth suggests potential applications in advanced optical and acoustic devices, including white light manipulation.