角单元对薄壁管的吸能特性影响显著,现有的关于耐撞性的研究只针对特定角度的角单元,不具备普遍性。文中将凹角引入薄壁管的截面形状设计中,提出一种新型的凹角管,实现了90°到180°之间任意角单元对薄壁管耐撞性影响的分析。首先，对一系列不同角度的薄壁管进行了轴向碰撞仿真；然后，利用超折叠单元理论定量推导出角单元与薄壁管轴向冲击平均力的表达式；最后，对理论预测结果和数值仿真结果进行了对比。研究结果表明：角单元角度显著地影响着凹角管的变形模式；当角单元角度为90°时,薄壁管有良好的耐撞性；薄壁管的平均力Fm和总吸能量EA随着角单元角度的增加而降低，当角单元角度从100°变为170°时,Fm和EA分别降低了45.64%和46.84%。

Angle elements play a very important role in energy absorption characteristics of tubes. However, the existing researches only study the influence of specific angle elements on crashworthiness, which is not universal. In this paper, concave corners were introduced into the cross-section design of thin walled tubes, a new concave tube was put forward to investigate the influence of angle element between 90°and 180°on crashworthiness. Crushing responses of concave tubes were studied by using both experiments and numerical simulations, through which the finite element models were well validated. Further, a range of concave tubes were parametrically modeled with angle elements. The result showed that the angle elements observably affected deformation mode, when angle element changed from 100°to 170°, Fm decreased 45.64%. Finally, theoretical expression of the mean crushing force of concave tubes was derived and the mean crushing force decreased with the increase of angle element, which was coincident with the numerical result.