In this paper, a hybrid thin-walled tube with multiple cells and multiple materials is proposed to achieve lightweight, high energy absorption efficiency, and low cost of structures. Energy absorption characteristics and crushing deformation of the hybrid structures are investigated by experimental testing and numerical analysis. Meanwhile, theoretical prediction models of the mean crushing force for hybrid structures are developed and its accuracy was verified. It is found from the sensitivity analysis that the parameters of the multi-cell structure have significant effects on energy absorption. Furthermore, the multi-objective optimization including surrogate models is performed to obtain optimal crashworthiness of the multi-cell hybrid tube. The same optimal results were obtained using the full factor response mapping optimization algorithm and the non-dominated sorting genetic algorithm with elite strategy algorithm for multi-objective optimization solution. Compared with the original multi-cell hybrid tube and multi-cell pure aluminum (Al) tube, the optimized structure showed an increase of 0.25% and 25.31% in specific energy absorption, an increase of 16% and 77.34% in average crushing force, and an increase of 3.89% and 23.08% in energy absorption efficiency, respectively.

中文翻译：

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多单元Al-CFRP混合管的理论分析与耐撞性优化

本文提出了一种具有多个单元和多种材料的混合薄壁管，以实现轻质、高能量吸收效率和低成本的结构。通过实验测试和数值分析研究了混合结构的能量吸收特性和破碎变形。同时，建立了混合结构平均压溃力的理论预测模型并验证了其准确性。灵敏度分析发现，多胞结构的参数对能量吸收有显着影响。此外，执行包括代理模型的多目标优化以获得多单元混合管的最佳耐撞性。采用全因子响应映射优化算法和非支配排序遗传算法结合精英策略算法进行多目标优化求解，得到了相同的优化结果。与原始多室混合管和多室纯铝（Al）管相比，优化后的结构比能量吸收分别提高了0.25%和25.31%，平均破碎力分别提高了16%和77.34%，能量吸收效率分别提高3.89%和23.08%。