Flexible Skins for Morphing Aircraft Using Cellular Honeycomb Cores
Flexible Skins for Morphing Aircraft Using Cellular Honeycomb Cores
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DOI：
10.1177/1045389x09350331
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发表时间：
2010-11-01
影响因子：
2.7
通讯作者：
Gandhi, Farhan
中科院分区：
文献类型：
--
作者：
Olympio, Kingnide R.;Gandhi, Farhan
这项研究提出并检验了用于变形飞机应用的柔性蒙皮的概念，该蒙皮由覆盖有柔顺面板的蜂窝状蜂窝芯组成。柔性蒙皮的整体特性很大程度上取决于蜂窝状蜂窝芯的特性，而蜂窝状芯的特性又取决于蜂窝参数。这项研究的结果表明，细胞核心很容易承受比构建它们的原始材料大 10 倍以上的整体应变。蜂窝芯的面内刚度通常比原始材料低几个数量级。使用比各向同性片材蒙皮更厚的芯材，对于相当的质量，面外刚度可以比片材蒙皮大很多倍（由于蜂窝芯材的孔隙率）。一般来说，具有正孔角的蜂窝芯（与拉胀芯相反）会产生更高的面外刚度。对于由高应变材料制成并承受大应变的蜂窝芯，需要考虑几何和材料非线性。当核心沿主轴拉伸时，它们会在几何上变硬，从而减少可实现的最大整体应变。当考虑材料软化时，使蜂窝芯变形至大整体应变所需的力会减小。
This study presents and examines the concept of flexible skins for morphing aircraft applications comprising of a cellular honeycomb core covered by a compliant face-sheet. The overall properties of the flexible skins are then largely governed by the characteristics of the cellular honeycomb core, which are in turn dependent on the cell parameters. The results of this study showed that the cellular cores could easily undergo global strains over 10 times greater than the virgin material of which they were built. The in-plane stiffness of the cellular cores is generally several orders of magnitude lower than the virgin material. Using cores that are thicker than isotropic sheet skins, the out-of-plane stiffness can be many times greater than the sheet skin for comparable mass (due to porosity of the cellular core). In general, honeycomb cores with positive cell angles (as opposed to auxetic cores) produce a higher out-of-plane stiffness. For cellular cores made from high-strain capable materials and undergoing large strains, geometric and material non-linearities need to be considered. When the cores are stretched along the principle axes they geometrically stiffen, thereby reducing the maximum global strains achievable. When material softening is considered, the forces required to deform the cellular core to large global strains are reduced.