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An Anisotropic Auxetic 2D Metamaterial Based on Sliding Microstructural Mechanism.

Teik-Cheng Lim1

  • 1School of Science and Technology, Singapore University of Social Sciences, Singapore 599494, Singapore. tclim@suss.edu.sg.

Materials (Basel, Switzerland)
|February 2, 2019
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Summary

This study introduces a novel 2D cross-shaped microstructure. This design allows for a tunable Poisson's ratio, ranging from 0 to less than -1, enabling advanced material design.

Keywords:
anisotropicauxeticmetamaterialsmicrostructureslot and slider mechanism

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Metamaterials offer unique mechanical properties.
  • Designing microstructures with tunable Poisson's ratios is crucial for advanced applications.

Purpose of the Study:

  • To propose and analyze a novel 2D microstructure with a reconfigurable Poisson's ratio.
  • To investigate the relationship between microstructure geometry and Poisson's ratio.

Main Methods:

  • A new 2D microstructure composed of rigid unit cells (cross-shaped) arranged in a rectangular array.
  • Kinematics approach to determine on-axis Poisson's ratio.
  • Mohr's circle analysis for off-axis Poisson's ratio.

Main Results:

  • The proposed microstructure exhibits a Poisson's ratio varying from 0 (loading parallel to axes) to -1 (loading at 45° for square arrays).
  • For rectangular arrays, the Poisson's ratio can be more negative than -1.
  • The Poisson's ratio is highly dependent on the loading angle and array configuration.

Conclusions:

  • The novel 2D microstructure demonstrates significant tunability in Poisson's ratio.
  • This design is promising for developing advanced materials with adaptable mechanical responses.
  • Potential applications in areas requiring rapid Poisson's ratio changes with angular loading.