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A flexible load-bearing deformable skin made of composite materials for easy installation and pretensioning

A composite material and flexible technology, applied in the fuselage bulkhead and other directions, can solve problems such as heavy structural weight, skin failure, complex process, etc., and achieve the effects of improving load-carrying performance, improving convenience and reliability, and being easy to connect

Active Publication Date: 2016-01-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing skin often needs to be connected by beading, etc., the process is complicated and the structure is heavy
[0004] In addition, the cracks in the flexible skin matrix are easy to expand, and the appearance of a crack may lead to the failure of the entire skin

Method used

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  • A flexible load-bearing deformable skin made of composite materials for easy installation and pretensioning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A flexible and load-bearing deformed skin of composite material that is easy to install and pretension, including a flexible skin matrix 2, the skin also includes fiber reinforcements 1, and the fiber reinforcements 1 are arranged in a serpentine shape in the flexible skin matrix 2 , the arc-shaped turning part 3 and the two ends 4 arranged in a serpentine shape are respectively located outside the flexible skin base.

Embodiment 2

[0018] According to one embodiment of the present invention, when a group of Kevlar fiber reinforcements are used for pretensioning perpendicular to the fiber direction, after the skin is stretched, its edges are fixed to the body with beading to perform pretensioning parallel to the fiber direction , hang the ring structure on the pre-tensioning device with hooks and load the pre-tensioning device to achieve pre-tensioning. The skin can undergo shear and unidirectional tensile variants perpendicular to the fiber reinforcement;

Embodiment 3

[0020] According to one embodiment of the present invention, a group of Kevlar fiber reinforcements are used, and when preloading parallel to the fiber direction, the skins on both sides of the machine body are covered at the corresponding positions at the same time, and then the thread ends that maintain a certain tension are repeatedly threaded alternately. Through the ring structure of the skin on both sides, the suture connection is carried out, and the pre-tightening force of the skin can be controlled by controlling the tension of the thread. The skin can undergo shear and unidirectional tensile variants perpendicular to the fiber reinforcement;

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Abstract

The invention discloses a composite flexible bearable deformation skin convenient to install and pre-tighten. The deformation skin comprises a flexible skin base body and fiber reinforced bodies, wherein the fiber reinforced bodies are arranged in the flexible skin base body in parallel in an S-shaped manner, and arc rotating parts and two end heads, which are in parallel in an S-shaped manner, of the fiber reinforced bodies are respectively positioned outside the flexible skin base body. The deformation skin is pre-tightened in a direction parallel to fibers, so that the bearing performance of the deformation skin can be improved; the fiber reinforced bodies form a mesh, and gaps of the whole skin can be limited in the mesh without causing large-area failure of the deformation skin; the deformation skin is easily connected with a machine body, and thus the convenience and the reliability of installation of the deformation skin are improved.

Description

technical field [0001] The invention relates to a flexible and loadable deformed skin of composite material which is convenient for installation and pretension. Background technique [0002] In order to adapt the aircraft to different flight missions, the concept of a variant aircraft that optimizes flight performance for different flight states by changing the area and shape of the lift body has been proposed internationally. Its skin needs to be flexible to fit the morph and load-bearing to keep the shape of the vehicle stable under aerodynamic loads. Existing flexible skins often meet the needs of variants, but have poor load-carrying capacity. [0003] For fiber-reinforced composite flexible skin, in order to improve its load-bearing performance, it needs to be preloaded in the direction parallel to the fiber reinforcement, and its load-bearing performance is positively related to the preload. Therefore, the connection between the skin and the body is very important. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64C1/12
Inventor 武睿白睿常志中孙健冷劲松刘彦菊
Owner HARBIN INST OF TECH