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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。
The flexible wing camber / span / chord scheme requires the skin to have one-dimensional large in-plane deformability in the plane and sufficient compressive and flexural stiffness in the vertical plane. A zero-Poisson ratio cross-shaped honeycomb was designed to support the elastic film to form a flexible skin structure. In-plane deformation mechanism, mechanical properties of honeycomb and cell shape parameters were studied. Parameters of in-plane uniaxial deformation of honeycomb were optimized. The honeycomb structure was equivalent to orthotropic material. The out-of-plane bending resistance of cross-shaped honeycomb and its influencing factors were studied. The applicability of cross-shaped honeycomb structure parameters was studied according to the design requirements of flexible skin with trailing edge camber. The results show that the honeycomb can meet the requirements of the flexible skin, and is lightweight and easy to drive.