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<p>Auxetic Kirigami Metamaterials (KMs) offer effective negative Poisson’s ratios under large stretching and hold promise for next-generation flexible metastructures. However, most existing designs suffer from either pronounced out-of-plane buckling or limited ability to maintain desirable auxetic behavior under large stretching. This study proposes a novel anti-chiral auxetic KM architecture employing an L-shaped cut configuration that concurrently exhibits mirror symmetry within the unit cell and fourfold rotational symmetry in each quadratic domain, thereby enabling the same mechanical response in the horizontal and vertical directions. Through systematic parametric optimization, the designed KM attains a consistently near-ideal Poisson’s ratio of − 1 under uniaxial stretching up to 40%. Their large deformations rely predominantly on in-plane bending of the connecting ligaments, effectively suppressing out-of-plane buckling even at large strains, which is a capability rarely achieved in previous Kirigami systems. Leveraging this characteristic, we further demonstrate high-fidelity display functionality using a fluorescent ‘福’ pattern that retains its geometric fidelity throughout stretching. These results establish anti-chiral KMs as a lightweight, mechanically robust, and buckling-resistant platform, providing a new structural paradigm for applications such as flexible electronics and deformable displays.</p>

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Anti-chiral kirigami metamaterials for − 1 Poisson’s ratio in large stretching

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Yinhan Liu,
  • Zheng Wu,
  • Zexin Song,
  • Pin Wen,
  • Yiqiang Wang

摘要

Auxetic Kirigami Metamaterials (KMs) offer effective negative Poisson’s ratios under large stretching and hold promise for next-generation flexible metastructures. However, most existing designs suffer from either pronounced out-of-plane buckling or limited ability to maintain desirable auxetic behavior under large stretching. This study proposes a novel anti-chiral auxetic KM architecture employing an L-shaped cut configuration that concurrently exhibits mirror symmetry within the unit cell and fourfold rotational symmetry in each quadratic domain, thereby enabling the same mechanical response in the horizontal and vertical directions. Through systematic parametric optimization, the designed KM attains a consistently near-ideal Poisson’s ratio of − 1 under uniaxial stretching up to 40%. Their large deformations rely predominantly on in-plane bending of the connecting ligaments, effectively suppressing out-of-plane buckling even at large strains, which is a capability rarely achieved in previous Kirigami systems. Leveraging this characteristic, we further demonstrate high-fidelity display functionality using a fluorescent ‘福’ pattern that retains its geometric fidelity throughout stretching. These results establish anti-chiral KMs as a lightweight, mechanically robust, and buckling-resistant platform, providing a new structural paradigm for applications such as flexible electronics and deformable displays.