In order to maintain the aerodynamic shape of morphing wing, this paper focuses on studying the out-of-plane stiffness of Kevlar/carbon fiber hybrid composite skins for a shear variable-sweep wing. Based on the shear deformation theories, the nonlinear mathematical model is developed for the out-of-plane stiffness of composite skins with the in-plane shear loading, the aerodynamic loading and the thermal loading. The material properties of Kevlar/carbon fiber hybrid composite skins are estimated through a micromechanical model and are assumed to be contact coefficient-dependent between reinforcing fiber and rubber matrix. Based on the principle of virtual work and the fundamental lemma of calculus of variations, the motion equations are derived and the closed-form solutions are obtained for sutured composite skins on the framework. Displacement fields of three different shear deformation theories, namely, classical plate theory (CPT), parabolic shear deformation theory (PSDT), sinusoidal shear deformation theory (SSDT), have been presented and compared. A systematic comparison between the theoretical solutions and experimental results is carried out to validate the excellent accuracy and reliability of the numerical evaluations. The effects of geometric and material parameters on the out-of-plane stiffness of composite skins are systematically studied.

为了保持变形机翼的气动外形，本文重点研究了用于剪切变后掠翼的芳纶/碳纤维混合复合材料蒙皮的面外刚度。基于剪切变形理论，建立了复合材料蒙皮平面外刚度在平面内剪切载荷、气动载荷和热载荷下的非线性数学模型。Kevlar/碳纤维混合复合材料蒙皮的材料特性通过微机械模型进行估计，并假设与增强纤维和橡胶基体之间的接触系数相关。基于虚功原理和变分基本引理，推导了骨架上缝合复合蒙皮的运动方程，得到了闭式解。三种不同剪切变形理论的位移场，即经典板块理论（CPT）、抛物线剪切变形理论（PSDT）、正弦剪切变形理论（SSDT），已经被介绍和比较。对理论解和实验结果进行了系统比较，以验证数值评估的出色准确性和可靠性。系统地研究了几何和材料参数对复合蒙皮平面外刚度的影响。对理论解和实验结果进行了系统比较，以验证数值评估的出色准确性和可靠性。系统地研究了几何和材料参数对复合蒙皮平面外刚度的影响。对理论解和实验结果进行了系统比较，以验证数值评估的出色准确性和可靠性。系统地研究了几何和材料参数对复合蒙皮平面外刚度的影响。