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<p>Based on the conventional re-entrant honeycomb structure, a novel enhanced negative Poisson’s ratio (NPR) structure was proposed, and the influence mechanisms of impact velocity and wall angle on its mechanical performance were systematically investigated. Through a combination of simulations and experiments, the results showed that under quasi-static loading conditions, the yield strength of the Eh-d structure increased by 114.67% compared to the Ori structure, while the specific energy absorption (SEA) improved by 43.56%. Under impact loading, the difference in yield strength between the two structures increased from 67.52% to 110.43%, and the SEA difference rose from 21.16% to 51.15%. Under low-velocity impact conditions, the effect of wall angle on structural performance was limited; however, at high impact velocities, increasing the wall angle significantly enhanced structural strength. Nevertheless, when the wall angle exceeded 70°, the strengthening effect tended to saturate. Across different impact velocities, wall angles of 65° and 70° exhibited superior SEA performance. This study innovatively proposed a high-performance enhanced NPR structure and systematically revealed the coupled effects of wall angle, impact velocity, and impact inclination on its mechanical performance, thereby providing feasible design strategies and theoretical support for the engineering applications of negative Poisson’s ratio structures in cushioning and shock absorption, particularly under extreme conditions such as aircraft emergency landings.</p>

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Dynamic mechanical performance of a novel negative Poisson’s ratio structure under impact loading

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Hao Cheng,
  • Junxia Yan,
  • Bingxian Ou,
  • Libin Xiong,
  • Wenjun Liu,
  • Donghui Zhang

摘要

Based on the conventional re-entrant honeycomb structure, a novel enhanced negative Poisson’s ratio (NPR) structure was proposed, and the influence mechanisms of impact velocity and wall angle on its mechanical performance were systematically investigated. Through a combination of simulations and experiments, the results showed that under quasi-static loading conditions, the yield strength of the Eh-d structure increased by 114.67% compared to the Ori structure, while the specific energy absorption (SEA) improved by 43.56%. Under impact loading, the difference in yield strength between the two structures increased from 67.52% to 110.43%, and the SEA difference rose from 21.16% to 51.15%. Under low-velocity impact conditions, the effect of wall angle on structural performance was limited; however, at high impact velocities, increasing the wall angle significantly enhanced structural strength. Nevertheless, when the wall angle exceeded 70°, the strengthening effect tended to saturate. Across different impact velocities, wall angles of 65° and 70° exhibited superior SEA performance. This study innovatively proposed a high-performance enhanced NPR structure and systematically revealed the coupled effects of wall angle, impact velocity, and impact inclination on its mechanical performance, thereby providing feasible design strategies and theoretical support for the engineering applications of negative Poisson’s ratio structures in cushioning and shock absorption, particularly under extreme conditions such as aircraft emergency landings.