超弹性蒙皮蜂窝芯的设计及等效模量研究

Design on Flexible Honeycomb and Research on Its Equivalent Modulus

可变形机翼的蒙皮需要有很高的各向异性,在特定方向具有较低的弹性模量而在其他方向具有较高的气动承载能力,为此设计了一种柔韧性较好、特定方向模量低且承载能力较强的新型超弹性蒙皮结构,对其蜂窝芯单元的力学性能进行了理论计算和有限元分析,并对不同几何参数单个蜂窝芯单元体和多个蜂窝芯单元体进行了轴向刚度测定试验,最后通过理论仿真和试验的对比分析,得到了该超弹性蒙皮蜂窝芯结构轴向刚度的等效模量近似工程计算公式。

The skin of a morphing wing would be highly anisotropic with low in-plane stiffness and high out-of-plane flexural bending stiffness,having the ability to undergo large strains.The approach of mechanics of material was presented to evaluate the elastic modulus of properties of the U-shape honeycomb.The U-shape honeycomb was proved to have low in-plane axial stiffness,which has a good flexibility and low modulus in certain direction and high load resistance.Both of finite-element modeling and experimental testing were carried out to verify the accuracy of the proposed analytical formulation.The analytical solutions developed compared well with both experimental test and FE modeling.The FE modeling of a large area was also carried out to get the Possion＇s ratio of the honeycomb.The simplified analyses and formulation presented for U-shape cores can be used in design and optimization of efficient cellular core structures.