Abstract

A new excellent energy absorption structure named as leaf vein branched circular tubes (LVBCT) is proposed based on lotus leaf vein branched structure. The crashworthiness of LVBCT under lateral load is numerically studied by LS-DYNA. First, the numerical simulation model is established and compared with the existing experimental results to verify the feasibility. Meanwhile, the crushing behaviour of the regular circular tube is carried out for comparison. It can be found that the introduction of leaf vein branched characteristics can enhance the energy absorption capacity. Following that, the influence of structural parameterson the crashworthiness of LVBCT is systematically studied. Finally, based on polynomial regression model and non-dominated sorting genetic algorithm II (NSGA-II), the optimal design of LVBCT with different numbers of main-veins are carried out. Under the lateral load, the optimised LVBCT has a very good energy absorption performance, which can be used for vehicle external safety protection.

摘要

在荷叶脉分支结构的基础上，提出了一种新型的优良吸能结构——叶脉分支圆管（LVBCT）。LS-DYNA对横向载荷下LVBCT的耐撞性进行了数值研究。首先，建立数值模拟模型，并与已有的实验结果进行对比，验证可行性。同时，对规则圆管的破碎行为进行了比较。可以发现，叶脉分枝特性的引入可以增强能量吸收能力。随后，系统研究了结构参数对LVBCT耐撞性的影响。最后，基于多项式回归模型和非支配排序遗传算法II（NSGA-II），对不同主脉数的LVBCT进行了优化设计。在横向载荷下，优化后的LVBCT具有非常好的能量吸收性能，可用于车辆外部安全保护。