Theoretical prediction and optimization of multi-cell hexagonal tubes under axial crashing
Theoretical prediction and optimization of multi-cell hexagonal tubes under axial crashing
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DOI：
10.1016/j.tws.2016.01.023
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发表时间：
2016-05
影响因子：
6.4
通讯作者：
Na Qiu;Yunkai Gao;Jianguang Fang;Zhaoxuan Feng;Guangyong Sun;Qing Li
中科院分区：
文献类型：
--
作者：
Na Qiu;Yunkai Gao;Jianguang Fang;Zhaoxuan Feng;Guangyong Sun;Qing Li
基于简化超级折叠单元理论，通过角单元、三角形单元Ⅰ和三角形单元Ⅱ这几种典型的单元，推导了四种不同形状的多单元六边形管的平均碰撞力解析公式。数值模拟的六边形多胞配置，然后与推导的解析解。最后，分析公式和有限元分析（FEA）为基础的代理模型被用来优化的六角管的横截面尺寸。从优化结果来看，网对网（W2W）是改善碰撞行为最有效的配置，而角对角（C2C）是这四种配置中最差的。重要的是，从分析公式得到的帕累托前沿同意以及从基于有限元分析的代理模型。结果表明，为提高计算效率，建议在耐撞性优化中采用解析公式。
In this paper, the analytical formulas of mean crashing force for four different hexagonal tubes with multiple cells were first derived based on the Simplified Super Folding Element (SSFE) theory through several typical constituent elements: corner element, three-panel angular element I and three-panel angular element II. The numerical simulations of hexagonal multi-cell configurations were then correlated with the derived analytical solutions. Finally, both analytical formulas and finite element analysis (FEA) based surrogate models were employed to optimize the cross-sectional dimensions of the hexagonal tubes. From the optimization results, web-to-web (W2W) is the most efficient configuration in improving the crashing behavior, while corner-to-corner (C2C) is the worst of these four configurations. Importantly, the Pareto fronts obtained from the analytical formulas agree well with those from the FEA based surrogate models. As a result, analytical formulas could be recommended in crashworthiness optimization for the sake of computational efficiency.