A comparative study of energy absorption characteristics of foam-filled and multi-cell square columns
A comparative study of energy absorption characteristics of foam-filled and multi-cell square columns
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DOI：
10.1016/j.ijimpeng.2006.10.007
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发表时间：
2007-11
影响因子：
5.1
通讯作者：
Xiong Zhang;G. Cheng
中科院分区：
文献类型：
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作者：
Xiong Zhang;G. Cheng
采用非线性有限元程序LS-DYNA对泡沫填充方柱与多孔方柱的吸能特性进行了对比研究。柱与泡沫材料均为铝材，柱各侧壁厚度保持1.5mm。数值计算结果与理论预测结果吻合较好，表明多孔柱的吸能效率比泡沫填充柱的吸能效率高50 ~ 100%。这意味着多室柱比泡沫填充柱更具吸引力，并通过对其倒塌模式的比较分析了其原因。此外，还介绍了一种多胞柱的预破碎触发器，并建立了模型。发现这种类型的触发器可以有效地消除初始峰值力，提高多细胞柱作为能量吸收器的效率。
A comparative study of energy absorption characteristics between foam-filled square columns and multi-cell square columns was conducted by using nonlinear finite element codes LS-DYNA. The columns and the foam were made of the same material aluminum and the thickness of all sidewalls of columns was kept 1.5mm. Numerical results compared well with theoretical predictions and showed that the energy absorption efficiency of multi-cell columns was about 50–100% higher than that of foam-filled columns. It means that multi-cell columns were more attractive than foam-filled columns and the reason for this was analyzed by a comparison of the collapse modes. Furthermore, a type of pre-crushed trigger was introduced and modeled for multi-cell columns. This type of trigger was found to be effective to eliminate the initial peak force and improve the efficiency of a multi-cell column as an energy absorber.