夹芯圆管耐撞性分析及结构优化

Crashworthiness and Structural Optimization of Sandwich Tube

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。结合响应面法和第二代遗传算法(NSGA-Ⅱ)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。

Sandwich round tubes are widely used in vehicle engineering and aerospace fields because of their light weight,low cost and high energy absorption rate.In order to improve the crashworthiness of the sandwich round tube,an axial impact simulation study was conducted using the finite element software Ansys to analyze the effects of the number of ribs,wall thickness and inner circle diameter on its crashworthiness.The structure of the sandwich tube was optimized by combining the response surface method and the second generation genetic algorithm(NSGA-II),and finally the structure was twisted to investigate the effect of twisting angle on the impact resistance performance.The results show that the wall thickness has the greatest effect on the impact resistance,and the inner circle diameter has basically no effect on the peak compression force.The torsional core tube can increase the specific energy absorption without increasing the peak compression force,and the impact resistance performance is significantly improved.The best effect is achieved when the torsional angle is 45°,which is 10.75%higher than that before torsion,providing a new method for the design of impact resistance of the core tube.