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首页> 外文会议>Proceedings of the Fifteenth international conference on civil, structural and environmental engineering computing >Multi-scale Modelling of Ni/Al Hybrid Metal Foams from Atomic to Microscale
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Multi-scale Modelling of Ni/Al Hybrid Metal Foams from Atomic to Microscale

机译：Ni / Al混合金属泡沫从原子到微观的多尺度建模

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摘要

Metal foams are bio-inspired cellular materials used for lightweight construction or as energy absorbers. As a result of their microstructure, the mechanical properties strongly depend on the properties of the strut material. In this paper, the properties of the so-called Ni/Al hybrid foams, consisting of pure aluminium foams electrochemically coated with nanocrystalline nickel, are evaluated on different hierarchical levels. The mechanical properties of Ni/Al hybrid foams are characterised by experiments and numerical modeling at different scales. The local mechanical properties of both the nickel coating and the aluminium alloy are measured by means of nanoindentation coupled with electron backscatter diffraction to gain information on the grain structure. Molecular dynamic simulations of nanoindentation on different structured nickel atom clusters were performed to attain a deeper understanding of the measured and identified properties. Furthermore, microindentation tests were performed to compare the results with the localised nanoindentation. Microtensile tests on real struts were performed to achieve a homogeneous elastic-plastic behaviour of the Ni/Al composite. Hence, we compare the local properties of the Ni coating and the Al strut at nanoscale with the global stress-strain behaviour of the Ni/Al composite at microscale. The results obtained from the microtensile experiments were compared with finite element simulations on single struts.
机译：金属泡沫是生物启发的多孔材料，用于轻型建筑或用作能量吸收器。由于其微观结构，机械性能在很大程度上取决于支柱材料的性能。在本文中，在不同层次上评估了所谓的Ni / Al杂化泡沫的性能，该泡沫由电化学镀有纳米晶镍的纯铝泡沫组成。 Ni / Al杂化泡沫的力学性能通过不同规模的实验和数值模拟来表征。镍镀层和铝合金的局部机械性能均通过纳米压痕与电子反向散射衍射相结合来获得，以获取有关晶粒结构的信息。对不同结构的镍原子簇上的纳米压痕进行了分子动力学模拟，以更深入地了解测量和鉴定的特性。此外，进行了微压痕测试以将结果与局部纳米压痕进行比较。对真实的支撑杆进行了微拉伸试验，以实现Ni / Al复合材料的均匀弹塑性行为。因此，我们将纳米级的镍涂层和铝支撑的局部性能与微米级的镍/铝复合材料的整体应力-应变行为进行了比较。从微拉伸实验获得的结果与单支杆上的有限元模拟进行了比较。

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