Li Weiwei, Li Zhaohui, Li Suhang, Wang Peng
Department of Civil Engineering, Nanyang Institute of Technology, Nanyang 473004, China.
Army Engineering University of PLA, Nanjing 210007, China.
Materials (Basel). 2022 May 31;15(11):3910. doi: 10.3390/ma15113910.
Under axial compression, multi-cell tubes are considered more effective than single-cell tubes. Regular hexagonal multi-cell tubes (HMT) were designed, tested, and analyzed by finite element modeling (FEM). The crushing mechanism of the HMT was revealed by compression testing and FEM. Experiments and FEM revealed that the mean crushing force of the HMT can be increased by 14% by adopting multi-cell topology, which shortens the folding wavelength and enables HMT progressive crushing. Thus, the HMT is more efficient in energy absorption compared with the conventional regular hexagonal thin-walled tube (HST). More triangular cells result in HMTs with much greater mean crushing force and specific energy absorption. Three evaluation methods were proposed and discussed to determine the effective crushing distance. A plastic model established according to classical simplified super-folding elements was shown to consistently predict the mean crushing force of the HMTs.
在轴向压缩下，多胞管被认为比单胞管更有效。设计、测试并通过有限元建模（FEM）分析了规则六边形多胞管（HMT）。通过压缩试验和有限元建模揭示了HMT的挤压机制。实验和有限元建模表明，采用多胞拓扑结构可使HMT的平均挤压力提高14%，这缩短了折叠波长并使HMT能够进行渐进式挤压。因此，与传统的规则六边形薄壁管（HST）相比，HMT在能量吸收方面更高效。更多的三角形单元会使HMT具有更大的平均挤压力和比能量吸收。提出并讨论了三种评估方法来确定有效挤压距离。结果表明，根据经典简化超折叠单元建立的塑性模型能够持续预测HMT的平均挤压力。
