Mesoscopic investigation of closed-cell aluminum foams on energy absorption capability under impact
Mesoscopic investigation of closed-cell aluminum foams on energy absorption capability under impact
复制标题
闭孔泡沫铝冲击吸能能力的细观研究
DOI：
10.1016/j.compstruct.2015.01.001
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发表时间：
2015-06-01
影响因子：
6.3
通讯作者：
Gong, Ziming
中科院分区：
文献类型：
--
作者：
Fang, Qin;Zhang, Jinhua;Gong, Ziming
本文提出了闭孔泡沫铝的三维 (3D) 细观模型。该模型与使用 Voronoi 技术开发的模型不同。考虑了孔隙形状和分布的随机性。细胞壁厚度随空间变化，这与测试观察结果一致。提出并验证了能量分析方法。通过数值模拟研究闭孔泡沫铝在冲击载荷下的能量吸收能力。通过数值研究了泡沫铝细观结构（泡孔壁强度和孔隙率）对能量吸收能力的影响。讨论细胞壁的介观响应以揭示能量吸收能力的机制。它揭示了能量吸收能力源于细胞壁在冲击下的永久变形（塑性应变、塌陷和断裂）。 (C) 2015 Elsevier Ltd. 保留所有权利。
This paper presents a three-dimensional (3D) mesoscopic model of closed-cell aluminum foams. This model is different from the model developed using Voronoi technique. Randomness of pores in shape and distribution is taken into account. The cell-wall thickness varies spatially which is consistent with test observations. Energy analysis approach is presented and validated. Numerical simulations are conducted to investigate the energy absorption capability of the closed-cell aluminum foams under impact loading. Effects of mesoscopic configurations of aluminum foams (cell-wall strength and porosity) on energy absorption capability are investigated numerically. Mesoscopic responses of the cell-walls are discussed to reveal the mechanism of energy absorption capability. It reveals that the energy absorption capability originates from the permanent deformation (plastic strain, collapse and fracture) of cell-walls under impact. (C) 2015 Elsevier Ltd. All rights reserved.