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To address the impact protection challenges during water entry of hybrid aerial underwater vehicle (HAUV) at different speeds, the optimal design of the buffer head cap is of paramount importance. By introducing support structures into the unit cell of zero Poisson’s ratio metamaterial, the multi-level buffering zero Poisson’s ratio metamaterial (MLB) capable of providing different effective stiffness and load-reducing performance against varying impact loads was developed. The application of MLB enabled HAUV to achieve three-stage adaptive energy absorption based solely on water-entry speed, without the need for sensors. Compared to the traditional buffer head cap structures, MLB not only exhibited strong energy absorption capability but also prevented structural instability and shape distortion. Additionally, it allowed for repeated use at least 20 times, thereby maintaining excellent anti-impact performance and aerodynamic shape during multiple cross-media processes. Thus, the buffer head cap composed of MLB provided an innovative method for adaptive adjustment of HAUV’s impact resistance performance when entering water.

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Enhancing Impact Resistance Performance of Multi-level Buffering Zero Poisson’s Ratio Metamaterials

  • 会议论文

  • 发表日期：

    2026年

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  • Hanhui Wang,
  • Kaitong Wang,
  • Mingcai Bai,
  • Lin Sun,
  • Gongnan Li

摘要

To address the impact protection challenges during water entry of hybrid aerial underwater vehicle (HAUV) at different speeds, the optimal design of the buffer head cap is of paramount importance. By introducing support structures into the unit cell of zero Poisson’s ratio metamaterial, the multi-level buffering zero Poisson’s ratio metamaterial (MLB) capable of providing different effective stiffness and load-reducing performance against varying impact loads was developed. The application of MLB enabled HAUV to achieve three-stage adaptive energy absorption based solely on water-entry speed, without the need for sensors. Compared to the traditional buffer head cap structures, MLB not only exhibited strong energy absorption capability but also prevented structural instability and shape distortion. Additionally, it allowed for repeated use at least 20 times, thereby maintaining excellent anti-impact performance and aerodynamic shape during multiple cross-media processes. Thus, the buffer head cap composed of MLB provided an innovative method for adaptive adjustment of HAUV’s impact resistance performance when entering water.