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A method for stitching/resin membrane infiltration molding resin matrix composites

A composite material and resin film technology, applied in the field of composite material manufacturing, can solve the problems of complex resin flow channel design, inconsistent permeability of preforms, and different permeability rates

Active Publication Date: 2016-06-22
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing resin film infiltration method, since the resin required for the parts is uniformly placed on the bottom layer of the entire preform, the resin infiltration process is greatly affected by the permeability and structural factors of each part of the preform, and the composite film using stitching technology The material is usually a reinforced panel structure with a complex structure. The permeability of the fiber preform in the stitched area and the non-stitched area is also inconsistent. Incomplete penetration due to inconsistent regional resin penetration rates

Method used

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  • A method for stitching/resin membrane infiltration molding resin matrix composites
  • A method for stitching/resin membrane infiltration molding resin matrix composites
  • A method for stitching/resin membrane infiltration molding resin matrix composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] Example 1: figure 1 The typical hat-shaped stiffened wall panel shown, the outer dimension of the wall panel is 1500mm×800mm, the skin 6 has 4 hat-shaped stiffeners 7, the material is U7192 / QY9512, the skin is 24 layers, and the reinforcement is 16 layers. The fiber volume content is required to be 60%. U7192 carbon fiber fabric surface density is 195g / m 2 , U7192 carbon fiber fabric uses T700 fiber density 1.81g / cm 3 , QY9512 resin density 1.24g / cm 3 . Use stitching technology to connect the flange of the hat-shaped reinforcement 7 with the skin 6 figure 2 The part stitching area 8 is stitched and integrally formed by the RFI process. The process steps are as follows:

[0166] a. Analyze the composition of typical parts, which are divided into skin 6-layer unit and reinforced 7-layer unit. The skin 6 ply unit and the reinforced 7 ply unit are partitioned according to the stitched and non-stitched areas respectively. The skin stitched area 4 is obtained by offsetting 5...

Embodiment 2

[0213] Example 2: Such as Figure 7 The structure of the hat-shaped stiffened wall panel is shown. The outer size of the wall panel is 4900mm×900mm, and the outer skin 6 is flat, with 4 hat-shaped stiffeners 7 with a total of 20 sections and two different cross-sectional sizes. The material is U7192 / QY9512, 20 layers of skin, 10 layers of reinforcement, and 56% fiber volume content is required. U7192 carbon fiber fabric surface density is 195g / m 2 , U7192 carbon fiber fabric uses T700 fiber density 1.81g / cm 3 , Toughened QY9512 resin density 1.24g / cm 3 . In order to improve the structural integrity, stitching technology is used to connect the cap-shaped ribbed flange with the skin. Figure 8 The stitching area 8 shown is stitched, and the remaining areas require interlayer toughness and require the use of RFI technology for integral molding. The process steps are as follows:

[0214] a. Wall panels are divided into skin 6-ply units and stiffened 7-ply units according to skin and...

Embodiment 3

[0261] Example 3: Such as Picture 12 The structure of "J" stiffened siding is shown, and the skin 14 has 5 "J"-shaped stiffeners 15. The material is U3160 / QY9512, the skin is of variable thickness, 22 layers are fully laid, the thickened area 16 has 6 layers of intercalation, and the reinforcement is a total of 16 layers of equal thickness, and the fiber volume content is 58%. U3160 carbon fiber fabric surface density is 160g / m 2 , U3160 carbon fiber fabric uses T300 fiber density 1.76g / cm 3 , Toughened QY9512 resin density 1.24g / cm 3 . In order to improve the strength of the interface between the reinforcement and the skin, the stitching technology is used to stitch the lower flange stitching area 8 and the skin 14 on both sides of the "J"-shaped reinforcement. The remaining areas require interlayer toughening and the RFI process is required. Perform integral molding. We adopted the technical solution of the present invention, and the specific process steps are as follows:

...

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Abstract

The invention belongs to a resin base composite material liquid molding technology and relates to a novel method for molding a resin base composite material by sewing / resin film infusion (RFI). According to the novel method, a resin film is arranged between fabric paving layers of a non-sewing region of a fiber enhanced pre-molded body; a resin film is arranged on the upper part of a sewing region. According to the novel method, a traditional manner of a single resin film in a traditional resin film infusion molding process is changed and different resin arranging manners are adopted aiming at the sewing region and the non-sewing region of a sewing structure so as to meet the requirements on a sewing process of the sewing region and conveniently carry out resin flow control of an RFI process; the novel method is good for sewing / RFI molding of a complicated structure and the RFI molding of more structures, even non-opening structures can be realized; the process stability is improved and the requirements on engineering production are adapted.

Description

Technical field [0001] The invention belongs to the technical field of composite material manufacturing, and relates to a method for stitching / resin film infiltration, ie, RFI (Resin Film Infusion, RFI for short) to form a resin-based composite material. Background technique [0002] Advanced composite materials have become one of the main materials for modern aircraft structures due to their specific strength, high specific rigidity and designability. However, with the continuous expansion of the amount of composite materials, the weaknesses of weak interlayer performance and high manufacturing costs have become more prominent, which limits the application of composite materials to some extent. In recent years, in order to improve the interlayer performance of composite materials, many domestic and foreign research institutions have been studying composite materials three-dimensional reinforcement technology and corresponding liquid molding technology. RFI (ResinFilm Infusion),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/38
CPCB29C70/38
Inventor 高艳秋赵龙
Owner AVIC COMPOSITES
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