Based on the theoretical crashworthiness model of variable thickness rectangular section tubes, this article simplified the super-folding element to analyze the energy absorption characteristics of variable thickness 12 right-angles section (VTTRS) tubes during axial crushing. To discuss the deformation mode of VTTRS tubes, a series of finite element models were built based on the verified finite element model of variable thickness rectangle section tubes. Then, the deformation of VTTRS tubes was studied to obtain the structures deforming in stable mode which have a great performance in energy absorption. Meanwhile, a theoretical solution of the mean crushing force for VTTRS tubes was proposed and verified by establishing three groups of finite element models with different thicknesses and thickness gradients. Finally, a prediction for crash box was presented and the results showed the great potential of VTTRS tubes in energy absorption and explained the important role played by the theoretical model for vehicle during concept design stage.

基于可变厚度矩形截面管的理论耐撞性模型，本文简化了超级折叠元件，以分析可变厚度的12个直角截面管（VTTRS）在轴向破碎过程中的能量吸收特性。为了讨论VTTRS管的变形模式，在验证的可变厚度矩形截面管有限元模型的基础上，建立了一系列有限元模型。然后，研究了VTTRS管的变形，从而获得了在能量吸收方面具有出色性能的稳定变形结构。同时，通过建立三组不同厚度和厚度梯度的有限元模型，提出并验证了VTTRS管平均挤压力的理论解。最后，