关键词: 角单元, 薄壁管, 凹角管, 耐撞性, 总吸能量, 平均力

Abstract: 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.