The conventional impact process is a quintessential impulse process that causes substantial damage due to the high initial impact force. However, the impact effect can be significantly diminished by making the impulse process quasi-statically by using a three-dimensional negative Poisson's ratio corrugated metamaterial (3D-NPRCM) structure. This paper proposes a novel 3D-NPRCM obtained by folding the 2D-NPRCM. This study examines the crashworthiness properties and impact force of 3D-NPRCM subjected to impact using the finite element method (FEM). The results reveal that the sequential matrix structure has the ability to make impact impulse processes quasi-statically. The effects of various folding angles, arrangements, and geometrical parameters on the properties are also explored. Finally, the 3D-NPRCM is employed in an automobile crash box design. Through axial quasi-static compression simulation, the peak crushing force of the 3D-NPRCM crash box is reduced by 25.374 % from 211.652 kN to 157.946 kN, and the energy absorbed is increased by 23.830 % from 11.259 kJ to 13.942 kJ, compared to the conventional crash box. Through cart lateral impact simulation, the peak crushing force of the 3D-NPRCM crash box is reduced by 18.076 % from 206.9 kN to 169.5 kN, and the compressive displacement is decreased by 9.457 % from 235.8 mm to 213.5 mm. This work presents a novel design proposition for a crash box in vehicle engineering and demonstrates a fresh approach to expand the design of three-dimensional mechanical metamaterials.

中文翻译：

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通过 3D-NPR 波纹超材料访问准静态冲击过程


传统的冲击过程是典型的脉冲过程，由于初始冲击力较高，会造成严重损坏。然而，通过使用三维负泊松比波纹超材料（3D-NPRCM）结构使脉冲过程准静态，可以显着减少冲击效应。本文提出了一种通过折叠 2D-NPRCM 获得的新型 3D-NPRCM。本研究使用有限元法 (FEM) 检查 3D-NPRCM 的耐撞性和冲击力。结果表明，顺序矩阵结构具有准静态冲击脉冲过程的能力。还探讨了各种折叠角度、排列和几何参数对性能的影响。最后，3D-NPRCM 应用于汽车碰撞盒设计。通过轴向准静态压缩模拟，与传统碰撞盒相比，3D-NPRCM碰撞盒的峰值压碎力从211.652 kN降低到157.946 kN，降低了25.374%，吸收能量从11.259 kJ提高到13.942 kJ，提高了23.830%。传统的碰撞盒。通过大车横向碰撞模拟，3D-NPRCM碰撞盒的峰值破碎力从206.9 kN降低到169.5 kN，降低了18.076%，压缩位移从235.8 mm降低到213.5 mm，降低了9.457%。这项工作提出了车辆工程中碰撞盒的新颖设计主张，并展示了扩展三维机械超材料设计的新方法。