夹芯圆管耐撞性分析及结构优化

夹芯圆管因其质量轻、成本低、能量吸收率高等特点被广泛应用于车辆工程和航空航天领域。为了提高夹芯圆管的耐撞性能，使用有限元软件Ansys进行轴向冲击仿真研究，分析了肋板数、壁厚、内圆直径对其耐撞性能的影响。结合响应面法和NSGA-Ⅱ算法对夹芯圆管的结构进行多目标优化，最后将结构进行扭转，探究扭转角对耐撞性能的影响。结果表明：壁厚对耐撞性的影响最大，内圆直径对峰值压缩力基本没有影响。扭转后的夹芯圆管可以在不提高峰值压缩力的前提下增加比吸能，耐撞性能有明显提高，扭转角度为45°时效果最佳，较扭转前增加了10.75%，为夹芯圆管的耐撞性设计提供了一种新方法。

Research on crashworthiness and structural optimization of sandwich tube

Sandwich tube is extensively used in vehicle engineering and aerospace fields in virtue of its light weight, low cost and high energy absorption rate. In order to improve the crashworthiness of the sandwich tube, the axial impact simulation was carried out by the finite element software ANSYS, and the effects of the number of ribs, wall thickness and inner circle diameter on its crashworthiness were analyzed. The structure of the sandwich tube was optimised by combining the response surface method and NSGA-II algorithm. Eventually, the structure was twisted to investigate the effect of torsion angle on the crashworthiness. The results show that the wall thickness has the greatest impact on the crashworthiness, and the inner circle diameter has basically no effect on the peak compressive force. The twisted sandwich tube can increase the specific energy absorption without increasing the peak compressive force, and the crashworthiness is significantly improved. When the torsion angle is 45 °, the effect reaches its peak, an increase of 10.75% compared with that before torsion, which provides a new method for the crashworthiness design of the sandwich tube.