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Buckling behavior of sandwich hemispherical structure considering deformation modes under axial compression

机译：考虑轴向压缩变形模式的夹层半球结构屈曲行为

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Sandwich structures are often used in space and aviation industry as energy absorption elements due to their load carrying capacity and light weight features. In experiments, it has been found that sandwich hemispherical structures have two different deformation modes referred as dimpling and flat mode under axial compression load. Deformation modes exercise a great influence on load carrying capacity of sandwich hemispherical structure. In this paper, theoretical models for two deformation modes of sandwich hemispherical structures under axial compression have been proposed. The reason for two different deformation modes observed in the compression tests has been explained. A finite element model has been set up and validated by the experimental results. Based on the numerical simulation results, buckling behaviors, load carrying capacities and displacements of top points of two different deformation modes have been compared. It is found that the load carrying capacity of the sandwich hemispherical structure under dimpling mode is about half of that under flat mode with very similar configurations. The deformation mode can be changed from dimpling to flat by adjusting the thicknesses of the out and inner metal sheets. This is a feasible and efficient way to improve the load carrying performance of the sandwich hemispherical structure. The optimal thickness ratio range of out and inner metal sheets are proposed. The methods can help improve the design of sandwich hemispherical structures to obtain better load carrying capacity with reasonable configuration. (C) 2016 Elsevier Ltd. All rights reserved.
机译：三明治结构由于其承载能力和轻巧的特性而经常在航天和航空工业中用作能量吸收元件。在实验中，已经发现夹层半球形结构在轴向压缩载荷下具有两种不同的变形模式，称为凹坑和平坦模式。变形模式对夹层半球形结构的承载能力有很大影响。本文提出了夹层半球结构在轴向压缩作用下的两种变形模式的理论模型。解释了在压缩测试中观察到两种不同变形模式的原因。建立了有限元模型，并通过实验结果进行了验证。基于数值模拟结果，比较了两种不同变形模式的屈曲行为，承载能力和顶部位移。已经发现，在非常相似的构造下，夹层半球形结构在衰减模式下的承载能力大约是在平坦模式下的一半。通过调整外侧和内侧金属板的厚度，可以将变形模式从凹陷变为平坦。这是一种改善夹层半球形结构的承载性能的可行而有效的方法。提出了外金属板和内金属板的最佳厚度比范围。这些方法可以帮助改进夹层半球形结构的设计，以合理的配置获得更好的承载能力。 （C）2016 Elsevier Ltd.保留所有权利。

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