A type of self-lock multi-cell tubes assembled by open section components is recently proposed to serve as energy absorbing devices. Due to the open feature of the section, the self-lock tubes with large width may develop global buckling mode under axial crushing and show much worse energy absorption performances. To overcome this drawback, expanded polystyrene (EPS) foam fillers are firstly employed to improve the stability of the structural deformation and to increase the energy absorption efficiency. Experiment results show that a 4% increase in mass by EPS foam leads to about 20% increase in energy absorption of the self-lock tube. Numerical analyses are also carried out to simulate the tests and analyze the structures with other enhancement methods including Al foam filling and tube enveloping. They may be employed separately or simultaneously. The combination method of Al foam filling and tube enveloping gets the highest energy absorption capacity and efficiency. Theoretical analysis is performed to predict the mean crushing force of self-lock tubes enhanced by Al foam filling and tube enveloping, and the theoretical results compare well with numerical results. Finally, crashworthiness optimization problems are proposed and solved to explore the optimal enhancement configurations of the self-lock multi-cell tubes.

最近提出了一种由开口部分组件组装的自锁式多室管，以用作能量吸收装置。由于该部分的开放特征，大宽度的自锁管在轴向挤压下可能会出现整体屈曲模式，并表现出更差的能量吸收性能。为了克服该缺点，首先使用膨胀聚苯乙烯（EPS）泡沫填料来改善结构变形的稳定性并增加能量吸收效率。实验结果表明，EPS泡沫的质量增加了4％，导致自锁管的能量吸收增加了约20％。还进行了数值分析，以模拟测试并通过其他增强方法（包括泡沫铝填充和管包封）来分析结构。它们可以单独使用，也可以同时使用。泡沫铝填充和管包封的组合方法具有最高的能量吸收能力和效率。进行了理论分析，以预测由于泡沫铝填充和管包裹而增强的自锁管的平均压溃力，理论结果与数值结果具有很好的对比。最后，提出了耐撞性优化问题并加以解决，以探索自锁多细胞管的最佳增强配置。