一种新型仿生层次多胞薄壁管的耐撞性研究

Crashworthiness of a Novel Bionic Hierarchical Multicellular Thin-walled Structure

薄壁结构以其优异的力学性能被广泛应用于汽车的防撞吸能设计中.本文以生物层次结构为仿生原型,提出了一种新型的多胞薄壁吸能结构,并采用理论和数值模拟对不同阶次层次截面的铝合金薄壁结构进行动力学分析,研究了层次结构对薄壁结构耐撞性能的影响.研究表明:在同等材料以及壁厚的情况下,层次多胞薄壁结构的比吸能与载荷效率等吸能特性优于传统的单胞和多胞结构,并随着层次结构的不断增加而进一步提升.

Thin-walled structure is widely used in automobile anti-collision energy absorption design because of its excellent mechanical properties.In this paper,taking the biological hierarchical structure as the bionic prototype,a new type of multi-cell thin-walled energy-absorbing structure is proposed,and the dynamic analysis of aluminum alloy thin-walled structures with different order cross-sections is carried out by theoretical and numerical simulation,and the impact of hierarchical structure on the crashworthiness of thin-walled structure is studied.The results show that in the case of the same material and wall thickness,the specific energy absorption and load efficiency of the hierarchical multi-cell thin-walled structure are better than the traditional single-cell and multi-cell structure,and further improved with the continuous increase of the hierarchical structure.