Out-of-Plane Stiffness Analysis of Kevlar/Carbon Fiber Hybrid Composite Skins for a Shear Variable-Sweep Wing

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-...

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Bibliographic Details
Published in:Applied composite materials 2021-10, Vol.28 (5), p.1653-1673
Main Authors: Yang, Guang, Guo, Hongwei, Xiao, Hong, Jiang, Huayi, Liu, Rongqiang
Format: Article
Language:English
Subjects:
Aerodynamic loads
Aramid fiber reinforced plastics
Calculus of variations
Carbon fibers
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Equations of motion
Hybrid composites
Industrial Chemistry/Chemical Engineering
Kevlar (trademark)
Material properties
Materials Science
Mathematical models
Morphing
Plate theory
Polymer Sciences
Reinforcing fibers
Reliability analysis
Shear deformation
Stiffness
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Summary: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.
ISSN:0929-189X
1573-4897
DOI:10.1007/s10443-021-09926-7