零泊松比十字形混合蜂窝设计分析及其在柔性蒙皮中的应用

柔性机翼变弯度/展/弦长方案需要蒙皮在面内具有一维大变形能力,并且在垂直平面方向能够提供足够的抗压和抗弯刚度。设计了一种零泊松比十字形混合蜂窝,支撑弹性胶膜构成柔性蒙皮结构。研究了十字形混合蜂窝的面内变形机理、蜂窝力学特性与单元形状参数的关系,针对蜂窝的面内单向变形能力进行了参数优化;将蜂窝结构等效为正交各向异性材料,研究了十字形混合蜂窝的面外抗弯能力及其影响因素;根据后缘变弯度机翼柔性蒙皮设计要求,研究了十字形混合蜂窝结构参数的适用性。结果表明这种蜂窝能够满足柔性蒙皮的使用要求,且质量轻、易驱动。

Design and analysis of a zero Poisson's ratio mixed cruciform honeycomb and its application in flexible skin

Variable camber/span/chord scheme for morphing flexible skin requires the skin to have the capacity of in-plane large deformation in one dimension and the ability to provide adequate out-of-plane bending and compressive rigidity. A zero Poisson''s ratio mixed cruciform honeycomb is proposed and used as flexible skin design by covering silicone panel on its surface. The in-plane deformation mechanism of the honeycomb is theoretically analyzed, as well as the effect of the cell shape parameters on mechanical properties. Targeting the in-plane one-dimensional morphing capacity, the parameters of the honeycomb are optimized. The honeycomb structure is equivalent to an orthotropic material, and the resistance to bending out-of-plane and its influencing factors of the mixed cruciform honeycomb are studied. According to the design requirements of the variable camber trailing edge wing flexible skin, the applicability of the mixed cruciform honeycomb''s structure parameter is studied. The results show that the designed honeycombs not only meet the operational requirement of the flexible skin but also have a light quality and small driving force.