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Fabricating Metamaterials Using the Fiber Drawing Method
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Auxetic Kirigami Metamaterials upon Large Stretching.

Chen Du1, Yiqiang Wang1, Zhan Kang1

  • 1State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment, Dalian University of Technology, Dalian 116024, China.

ACS Applied Materials & Interfaces
|April 7, 2023
PubMed
Summary

This study introduces novel kirigami metamaterials (KMs) that maintain their auxetic properties under significant strain by utilizing out-of-plane buckling. These advanced KMs offer enhanced performance for applications requiring stretchability and shape retention.

Keywords:
kirigami metamaterialnegative Poisson’s ratioout-of-plane bucklingstretchable displaystructural optimization

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metamaterials

Background:

  • Auxetic kirigami metamaterials (KMs) exhibit negative Poisson's ratios due to in-plane deformation.
  • Existing thin KMs lose auxeticity under large strains due to out-of-plane buckling and stress failure in thicker variants.

Purpose of the Study:

  • To design a novel family of KMs that exploit out-of-plane buckling to achieve and maintain auxeticity under large strains (up to 0.50).
  • To investigate the unique properties and potential applications of these new KMs.

Main Methods:

  • Development of a new KM design model incorporating out-of-plane buckling.
  • Numerical simulations and experimental validation of the designed KMs.

Main Results:

  • The designed KMs successfully realize and retain auxeticity up to 0.50 applied strains.
  • Exhibited unique properties include designable negative Poisson's ratios, sheet thickness-insensitive auxeticity, and excellent shape recoverability.
  • Demonstrated potential application as a stretchable display without image distortion.

Conclusions:

  • The proposed auxetic KMs overcome limitations of existing designs by leveraging controlled buckling.
  • These KMs offer new design possibilities for functional devices in robotics, bio-medical engineering, and flexible electronics.