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Composite-material braided prefabricated filling belt and preparation method of composite-material braided prefabricated filling belt

A technology of composite materials and filling tapes, which can be applied to cladding optical fibers, optical waveguides and light guides, etc., and can solve the problems of low survival rate of grating optical fibers

Inactive Publication Date: 2012-10-03
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the reasons why this technology is difficult for industrial application is that laying the grating fiber requires extremely high skills, because the grating fiber is essentially a glass material, brittle and easy to break, laying it into a composite material prefabricated structure, and then after a long The preparation process of the composite material itself, the "survival rate" of the grating fiber is therefore extremely low

Method used

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  • Composite-material braided prefabricated filling belt and preparation method of composite-material braided prefabricated filling belt

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preparation example Construction

[0034] The specific operation steps of the preparation method of the composite material weaving prefabricated filling belt with sensing function concurrently according to the present invention are as follows:

[0035] (1) Select the filling amount of fiber yarn: based on the standardized overall structure and shape and size of the triangular area of ​​the composite material structural part, and use the fiber volume fraction of the composite material structural part to design the fiber yarn used in the triangular area of ​​the composite material part The total number of fiber bundles N, select fiber yarns with fiber bundles of N / 20 to 4N / 5 as the core material consumption, and the rest as the cladding fiber yarn consumption;

[0036] (2) Preparation of core material: first prepare a non-reactive sizing agent solution with a mass percentage concentration of 1%wt. to 20%wt., and spray or brush the non-reactive sizing agent solution on the surface of the fiber yarn for the core mat...

Embodiment 1

[0044] (1) Take 2 bundles of 12K T300 carbon fiber bundles as the core material, and spray a small amount (about 1 / 100 to 4 / 100 by mass percentage) of epoxy sizing agent for pretreatment. The molding process is at 65°C and under vacuum-assisted conditions Keep for 20min;

[0045] (2) Take 9 bundles of 12K T300 carbon fiber bundles, and carry out two-dimensional two-way weaving according to the standard weaving process on the outside of the above core material;

[0046] (3) On the outer surface of the braid, a small amount (about 1 / 100 to 4 / 100 by mass) is sprayed with a commercial epoxy setting agent, and after proper volatilization, it is continuously stretched axially into a simple equilateral triangular die ( see figure 1 a), the temperature of the die is matched with the sizing agent, so that the braid is shaped as a prefabricated braid of equi-arc triangle, stand-by;

[0047] (4) Similar to the above point (3), but changing the equal-arc triangle die into a right-angled...

Embodiment 2

[0049] The difference between this implementation example and embodiment 1 is that the forming die is changed to an equilateral triangle die and is a right angle arc chord triangle die (see figure 1 b), and the prefabricated braid of the right-angled arc-chord triangle that wraps the sensing grating optical fiber inside the core material, ready for use.

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Abstract

The invention belongs to a composite-material braided prefabricated filling belt and a preparation method of the composite-material braided prefabricated filling belt, and relates to a standard size for structural shape and size of the braided prefabricated filling belt, and a braided prefabrication technology; the integral filling of a composite material structural member in a sealed or semi-open triangle region is provided by the filling belt, and the connecting characteristics, the overall characteristics and the structural integrity of a filling region can be improved, so that the usage performance of the composite material structural member is improved; meanwhile, Bragg grating fibers can be covered inside the filling belt, and the filling belt becomes a sensor embedded with the composite material structural member, so that online monitoring of threats on the composite material structural members by foreign members in a service state can be performed, and the usage safety and the value of the composite material structural member can be improved.

Description

technical field [0001] The invention belongs to composite material preparation technology, and relates to a composite material braided prefabricated filling belt and a preparation method thereof. Background technique [0002] A large number of carbon fiber composite structural parts are used in the aerospace field. They can be classified and abstracted as some structural parts 2 with walls, reinforcements, ribs, and caps. The corners of these structural parts and the structural parts 2 and substrates 1 There is a "closed" or "semi-open" so-called "triangular area" ( figure 1 ). By using the filling strip 3 of similar material to fill with approximately equal density, it will be possible to improve the connection characteristics of the composite material structure, improve the integrity of the structure, and overcome stress concentration and the like. [0003] Traditionally, the common filling material is unidirectional fiber yarn or fiber bundle, which is properly shaped d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
Inventor 益小苏安学锋崔海超刘刚
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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