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Abstract：
Creating lightweight and impact-resistant box structures has been an enduring pursuit among researchers. A new energy-absorbing structure consisting of a bionic gradient lattice-enhanced thin-walled tube is presented in this article. The gradient lattice and thin-walled tube were prepared using selective laser melting (SLM) and wire-cutting techniques, respectively. To analyze the effects of gradient pattern, mass ratio, diameter range and impact speed on structural crashworthiness, low-speed impact at 4 m/s and finite element simulation experiments were conducted. The study demonstrates that the design of inward radial gradient lattice-reinforced thin-walled tubes can effectively enhance structure\'s energy-absorption efficiency and provide a more stable mode of deformation. It also shows a 17.44% specific energy-absorption advantage over the uniformly lattice-reinforced thin-walled tubes, with no significant overall gain in peak crushing force. A complex scale evaluation method was used to determine the optimum structure and the structure type with the best crashworthiness was found to be a gradient lattice-filled tube with a thickness of 0.9 mm and a slope index of 10. The gradient lattice-reinforced thin-walled tube suggested in this investigation offers guidance for designing a more efficient thin-walled energy-absorption structure.
摘要：
创造轻质和耐冲击的盒子结构一直是研究人员的持久追求。本文提出了一种由仿生梯度晶格增强薄壁管组成的新型吸能结构。使用选择性激光熔化（SLM）和线切割技术制备了梯度晶格和薄壁管，分别。为了分析梯度模式的影响，质量比,直径范围和速度对结构耐撞性的影响，进行了4m/s低速冲击和有限元仿真实验。研究表明,向内径向梯度格构增强薄壁管的设计能有效提高结构的能量吸收效率,提供更稳定的变形模式。与均匀晶格增强的薄壁管相比，它还具有17.44％的比能量吸收优势，峰值破碎力没有显著的总体增益。使用复杂尺度评估方法来确定最佳结构，并且发现具有最佳耐撞性的结构类型是厚度为0.9mm，坡度指数为10的梯度晶格填充管。本研究中建议的梯度晶格增强薄壁管为设计更有效的薄壁能量吸收结构提供了指导。
