This paper presents an investigation into the energy absorption behaviour of splitting multiple circular tubes by theoretical, experimental and numerical methods. A theoretical solution for the steady-state crushing force of splitting multiple circular tubes is derived by applying the deformation theory. To explore the energy absorption of splitting multiple circular tubes and to validate the finite element model and a theoretical solution for the crushing force, an impact experiment is performed using a test trolley to examine the splitting process and force responses of multiple circular tubes. The finite element models of splitting multiple circular tubes are then established to investigate the energy absorption behaviour of the structure. The numerical simulation results agree well with those of the impact experiment. The energy absorption of splitting multiple circular tubes with different geometrical configurations, including the wall thickness of the tubes, number of tubes, radius of the tubes and conical angle of the dies, is analysed using a validated finite element model. The results show that the geometrical configurations of the tubes and conical angle of the dies have a distinct effect on the energy absorption. An analysis is also conducted to investigate the energy absorption by the evolution of the theoretical models. It is confirmed that the theoretical solutions provide a reliable prediction of the steady-state crushing force of splitting multiple circular tubes. The effect of the velocity is investigated, and the result shows that the steady-state force increased as the impact velocity increased.

本文通过理论，实验和数值方法研究了将多个圆形管分开的能量吸收行为。应用变形理论推导了分裂多个圆形管的稳态破碎力的理论解。为了探索分裂多根圆管的能量吸收并验证有限元模型和压碎力的理论解，使用试验台车进行了一次冲击实验，以检查多根圆管的分裂过程和力响应。然后建立分裂多个圆形管的有限元模型，以研究结构的能量吸收行为。数值模拟结果与冲击实验结果吻合良好。使用验证的有限元模型分析了分裂具有不同几何构型的多个圆形管的能量吸收，包括管的壁厚，管的数量，管的半径和模具的圆锥角。结果表明，管的几何形状和模具的圆锥角对能量吸收有明显的影响。还进行了分析以通过理论模型的演变来研究能量吸收。可以肯定的是，理论解为多圆管分裂的稳态破碎力提供了可靠的预测。研究了速度的影响，结果表明稳态力随冲击速度的增加而增加。