Perforation of sandwich plates with graded hollow sphere cores under impact loading
Perforation of sandwich plates with graded hollow sphere cores under impact loading
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DOI：
10.1016/j.ijimpeng.2010.05.002
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发表时间：
2010-11
影响因子：
5.1
通讯作者：
H. Zeng;S. Pattofatto;Han Zhao;Yannick Girard;V. Fascio
中科院分区：
文献类型：
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作者：
H. Zeng;S. Pattofatto;Han Zhao;Yannick Girard;V. Fascio
本文研究了由0.8mm厚的2024 T3铝合金蒙皮和梯度聚合物空心球芯（具有不同密度梯度）制成的夹层板。利用SHPB系统进行了45 m/s的反向射孔实验。准静态测试使用相同的夹紧系统允许率效应的调查。数值模拟是为了获得不可缺少的局部信息（这是实验上无法获得的），以更好地理解穿孔过程。利用这些实验和数值工具，发现梯度分布改变了研究的冲击载荷下的穿孔过程，而它们在准静态载荷下没有影响。在冲击载荷作用下，早期两种变形模式的竞争控制着其后的整个变形过程。一个是与入射皮肤接触的第一层的整体压碎，另一个是入射皮肤片的刺穿。当第一层相当坚固时，入射的表皮层破裂，随后射孔器在岩心中穿孔。当第一层相当薄弱时，表层折叠成核心，并发展出一个更耗能的过程。就能量吸收能力以及非片材断裂标准而言，最佳梯度轮廓应该是较弱的第一层和逐渐增强的芯。
In this paper, sandwich plates made from 0.8mm 2024T3 aluminium alloy skin sheets and graded polymeric hollow sphere cores (having various density gradients) are studied. The experiments at 45m/s were performed with an inversed perforation setup using SHPB system. Quasi-static tests using the same clamping system allow for the rate effect investigation. Numerical simulations are performed in order to get the indispensable local information (which is not experimentally available) to better understand the perforation process. With these experimental and numerical tools, it is found that the gradient profiles change the perforation process under studied impact loading, whereas they have no influence under quasi-static loading. Under impact loading, a competition of two deforming scenarios at the early stage governed the whole process afterwards. One is the global crush of the first layer in contact with the incident skin and the other is the piercing of the incident skin sheet. When the first layer is rather strong, the incident skin sheet breaks and the perforator makes a hole in the core afterwards. When the first layer is rather weak, the skin sheet folds into the core and develops a much more energy consuming process. The best gradient profile in terms of the energy absorption capacity as well as the non-sheet breaking criterion should be a weaker first layer and a progressively enhanced core.