A large deformation flexible cellular structure composite material and its preparation method

Abstract

The invention discloses a large-deformation composite material with a flexible cellular structure and a preparation method of the large-deformation composite material. According to the large-deformation composite material, glass fiber cloth and flexible epoxy resin which need to greatly deform and are used for single-cell cell walls are molded according to a stressing property of the large deformation of the cellular structure; a large deformation function is realized by adopting the flexible epoxy resin; glass fibers and epoxy resin, which have connection effects, of the cell walls are molded; carbon fibers and epoxy resin which have connection effects on single cell lines are molded so that the high rigidity is obtained; and the requirements on bearing out-plane load and keeping the shape of the cellular structure in deformation are met. According to the method, primary paving, and primary curing and molding are adopted, and interface defects caused by secondary paving and curing are avoided; and single-cell inter-line binding force is improved, the process is simplified and the cost is reduced. The composite material with the flexible cellular structure, which is prepared by adopting the method, can be applied to a flexible supporting body of a morphing wing skin or a morphing structure.

Description

technical field [0001] The invention relates to a flexible cellular structure composite material capable of large deformation and a preparation method thereof, which can be used for a variant wing skin or a support body of a variant structure requiring large deformation. Background technique [0002] The morphing wing and morphing structure are important components of the next generation morphing aircraft, and are a new research hotspot at home and abroad. [0003] The variant wing refers to the wing whose parameters such as cross-sectional area, front and rear edge camber, wingspan, and sweep angle can be changed according to environmental changes or different tasks. Traditional hinged control surfaces or high-lift devices, such as flaps, ailerons, etc., which rely on separate parts to change the geometry of the wing, cannot be called variant wings. The variant wing integrates the airfoils under different flight conditions, and changes the aerodynamic performance through t...

AI Technical Summary

Problems solved by technology

The cellular structure prepared by these materials, because it is the same material in the whole structural formula, the matrix rigidity is large, and it is easy to break during the deformation process, so it is difficult to obtain large deformation

Although the cell-like structure made of silicone rubber can obtain large deformation, because the whole structure is flexible, it cannot bear the out-of-plane load, and during the deformation process, one side of the plane is elongated, and the side perpendicular to it shrinks.

These cellular structures cannot fully meet the theoretical deformation requirements on scale in the experimental verification, and cannot be applied in actual engineering, which is the bottleneck restricting the research and development of this type of materials.

Images