Scholarlink

<p>This paper investigates the compression behavior of a novel circular bio-inspired auxetic metamaterial, characterized by hourglass-shaped gaps in its unit cells, unlike typical re-entrant or chiral designs that use straight ribs or spirals. The achieved exceptional auxetic behavior was a result of the unique cell geometry, inspired by the structure of a spider’s body. A 3D-printed specimen with an x-angle of 140° was subjected to compression testing, demonstrating a negative Poisson’s ratio where the structure contracts laterally under axial loading. The load–displacement curve exhibited three distinct regions, linear, decreasing slope, and steady state, with the simulation closely matching experimental results, differing by only 10% in stiffness and 0.3% in peak load. Stress and strain analyses revealed the formation of localized high-stress regions and gradual softening during deformation. The influence of x-angle on performance was also investigated, showing that increasing the x-angle enhanced both maximum load and energy absorption. Stiffness increased from 405&#xa0;N/mm at 120° to 854.5&#xa0;N/mm at 160°, while energy absorption improved by 68.5%. Furthermore, normalized stiffness and specific energy absorption (SEA) were evaluated, both exhibiting a positive correlation with x-angle. The SEA–strain curves followed an S-shaped trend, indicating progressive energy absorption with increasing deformation. These findings highlight the tunable mechanical characteristics of the proposed design, demonstrating its potential for lightweight, high-performance applications such as vibration-damping and stiffness-optimized cutting tools.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

3D printed novel bio-inspired auxetic metamaterial structure with tunable geometry for improved light weight cutting tool stiffness and energy absorption

  • 期刊论文

  • 发表日期：

    2026年5月6日

查看全文
  • Chao Feng,
  • Jialiang Xu,
  • Jian Zhu,
  • Zhiqiang Kou

摘要

This paper investigates the compression behavior of a novel circular bio-inspired auxetic metamaterial, characterized by hourglass-shaped gaps in its unit cells, unlike typical re-entrant or chiral designs that use straight ribs or spirals. The achieved exceptional auxetic behavior was a result of the unique cell geometry, inspired by the structure of a spider’s body. A 3D-printed specimen with an x-angle of 140° was subjected to compression testing, demonstrating a negative Poisson’s ratio where the structure contracts laterally under axial loading. The load–displacement curve exhibited three distinct regions, linear, decreasing slope, and steady state, with the simulation closely matching experimental results, differing by only 10% in stiffness and 0.3% in peak load. Stress and strain analyses revealed the formation of localized high-stress regions and gradual softening during deformation. The influence of x-angle on performance was also investigated, showing that increasing the x-angle enhanced both maximum load and energy absorption. Stiffness increased from 405 N/mm at 120° to 854.5 N/mm at 160°, while energy absorption improved by 68.5%. Furthermore, normalized stiffness and specific energy absorption (SEA) were evaluated, both exhibiting a positive correlation with x-angle. The SEA–strain curves followed an S-shaped trend, indicating progressive energy absorption with increasing deformation. These findings highlight the tunable mechanical characteristics of the proposed design, demonstrating its potential for lightweight, high-performance applications such as vibration-damping and stiffness-optimized cutting tools.

Graphical abstract