Impact behavior of honeycomb structures with various cell specifications - numerical simulation and experiment
Impact behavior of honeycomb structures with various cell specifications - numerical simulation and experiment
复制标题
DOI：
10.1016/j.ijimpeng.2004.09.001
复制
发表时间：
2005-12-01
影响因子：
5.1
通讯作者：
Gotoh, M
中科院分区：
文献类型：
--
作者：
Yamashita, M;Gotoh, M
裸铝合金（A5052）蜂窝在电池的纵向方向上被压缩。采用显式有限元程序DYNA 3D对气液两相流压溃过程进行了数值模拟，研究了气液两相流压溃过程中气液两相流胞体形状和气液两相流压溃厚度对压溃过程的影响。用落锤冲击装置进行了冲击速度为10 m/s的冲击实验和相应的准静态冲击实验。在冲击实验中，由于蜂窝单元中封闭的空气，压应力随着锤行程而增加。然而，在初始压缩的名义应力是非常相似的两种情况。计算中采用单“Y”形截面柱的数值模型，冲击速度为10 m/s。“Y”形截面中的分支的内角范围为30度至180度。数值结果表明，在各种情况下均发生循环屈曲，且分支角越小，抗压强度越高。它随着箔厚度的增加而增加。然而，当压碎强度仅相对于材料部分的净横截面进行评估时，当单元形状为正六边形时，压碎强度达到最大值。数值计算结果与相应的实验结果吻合较好。(c)2004 Elsevier Ltd.保留所有权利。
The bare aluminum alloy (A5052) honeycomb is compressed in the longitudinal direction of the cell. Effect of the cell shape and the foil thickness on crush behavior is investigated by the numerical simulation using an explicit FEM code DYNA3D. Impact experiment using a drop-hammer apparatus whose impact velocity is 10m/s and the corresponding quasi-static one are also performed. In the impact experiment, compressive stress increases with the hammer travel due to the air enclosed in the honeycomb cells. However, the nominal stress at the incipient compression is very similar for both the cases. In computation, numerical model of one 'Y' cross-sectional column is used and the impact velocity is 10 m/s. Internal angle of branch in 'Y' cross-section ranges from 30 degrees to 180 degrees. The numerical result shows that the cyclic buckling mode takes place in every case and that the crush strength is higher for smaller branch angle. It increases with the foil thickness. However, when the crush strength is evaluated with respect to the net cross-section of the material part only, it attains the maximum value when the cell shape is of regular hexagon. Numerical results are well consistent with the corresponding experimental ones. (c) 2004 Elsevier Ltd. All rights reserved.