A linear gap repair structure using carbon fiber prepreg

Abstract

This utility model relates to the field of carbon fiber technology and discloses a linear gap repair structure for carbon fiber prepreg. It includes a carbon fiber material layer with linear gaps, a first repair piece, a second repair piece, elastic filler blocks, and solid adhesive. The carbon fiber material layer is sandwiched between the first and second repair pieces, which cover the linear gaps. Two elastic filler blocks are provided and fixed to the first and second repair pieces near the center of the carbon fiber material layer. The two elastic filler blocks face each other and work together to fill the linear gaps. Solid adhesive is applied to the sides of the first and second repair pieces facing the carbon fiber material layer and to the surface of the elastic filler blocks, bonding the carbon fiber material layer to the surface. This utility model uses elastic filler blocks to fill the linear gaps, ensuring that voids are less likely to appear within the gaps, improving service life, and preventing peeling risks during long-term use.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber technology, and in particular to a linear gap repair structure for carbon fiber prepreg. Background Technology

[0002] Carbon fiber prepreg, due to its superior properties such as high strength, lightweight, and corrosion resistance, is widely used in the manufacture of high-reliability structural components such as aircraft fuselage skins, automotive battery pack housings, and wind turbine blades. During the production, storage, or processing of carbon fiber prepreg, factors such as external impact, temperature changes, or resin shrinkage can easily cause linear cracks (0.1–5 mm wide and >10 mm long) to form on its surface. If not repaired in time, these cracks will widen during subsequent molding processes such as compression molding and autoclave treatment, leading to a significant decrease in the mechanical properties of the final component and even structural failure.

[0003] The carbon fiber prepreg linear gap repair structure described in announcement number CN213500980U includes two carbon fiber material layers with a planar linear gap between them, a first repair piece, and a second repair piece. The first and second repair pieces are carbon fiber prepregs made of carbon fiber fabric of the same type as the carbon fiber material layers. The first and second repair pieces are respectively bonded to both sides of the two carbon fiber material layers, covering the planar linear gap. The length direction of the first and second repair pieces is along the extension direction of the planar linear gap, and the width of the first repair piece is greater than the width of the second repair piece.

[0004] Based on the above technical features, the problem is that in the existing technology, only surface bonding and resin penetration of the repair patch are used for repair, which can easily lead to gaps inside the crack and the risk of peeling after long-term use.

[0005] Therefore, it is necessary to solve the above problems by using a linear gap repair structure made of carbon fiber prepreg. Utility Model Content

[0006] The purpose of this invention is to provide a linear gap repair structure for carbon fiber prepreg to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a carbon fiber prepreg linear gap repair structure, comprising a carbon fiber material layer with linear gaps, and further comprising a first repair piece, a second repair piece, an elastic filler block, and a solid adhesive; the carbon fiber material layer is sandwiched between the first repair piece and the second repair piece, and the first repair piece and the second repair piece cover the linear gaps;

[0008] Two elastic filler blocks are provided and fixed to the center of the first repair piece and the second repair piece near the carbon fiber material layer, respectively; the two elastic filler blocks face each other and are used to fill the linear gaps together; the solid adhesive is applied to the side of the first repair piece and the second repair piece facing the carbon fiber material layer and the surface of the elastic filler blocks, and the solid adhesive adheres to the carbon fiber material layer.

[0009] Preferably, the first and second repair patches are carbon fiber prepregs made of carbon fiber fabric of the same type as the carbon fiber material layer.

[0010] Preferably, the two elastic filler blocks have wedge-shaped surfaces at their adjacent ends.

[0011] Preferably, the elastic filler block on the first repair patch and the first repair patch together form a structure with a T-shaped cross-section.

[0012] Preferably, the elastic filler block on the second repair patch and the second repair patch together form a structure with a T-shaped cross-section.

[0013] Preferably, the lengths of the first and second repair patches extend along the direction of the linear gap.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] First, based on the original repair method of bonding the repair patch surface and resin penetration repair, this utility model uses an elastic filler block to fill the linear gap, ensuring that the linear gap is not prone to voids, improving service life, and ensuring that there is no risk of peeling during long-term use.

[0016] Secondly, the elastic filler block on the first repair piece of this utility model and the first repair piece together form a T-shaped structure in cross section, and the elastic filler block on the second repair piece and the second repair piece together form a T-shaped structure in cross section. During repair, the positioning function can be automatically realized, so that the first repair piece and the second repair piece are symmetrically distributed on both sides of the linear gap, without the need for precise manual calibration, simplifying the operation process and improving repair efficiency.

[0017] Third, this utility model uses carbon fiber prepreg of the same type as the carbon fiber material layer as the repair sheet, combined with a centrally fixed elastic filler block and solid adhesive. The strength of the superimposed repair area is greater than that of the single-layer carbon fiber sheet repair area, which can stably restore the structural strength. At the same time, it controls the weight increase ratio, effectively repairs linear cracks in carbon fiber products and raw materials, as well as planar linear splicing seams formed by splicing flat carbon fiber plates, reducing maintenance and use costs, reducing raw material waste, and improving economic efficiency. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the three-dimensional assembly structure of this utility model;

[0019] Figure 2 This is a three-dimensional top view of the present invention;

[0020] Figure 3 This is a three-dimensional side view of the present invention;

[0021] Figure 4 This utility model Figure 1 Enlarged diagram of point A.

[0022] In the diagram: 1. Carbon fiber material layer; 2. First repair patch; 3. Second repair patch; 4. Solid adhesive; 5. Wedge-shaped surface; 6. Linear gap; 7. Elastic filler block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figures 1 to 4 The carbon fiber prepreg linear slot repair structure shown includes a carbon fiber material layer 1 with linear slots 6, a first repair patch 2, a second repair patch 3, two elastic filler blocks 7, and a solid adhesive 4.

[0025] The first repair patch 2 and the second repair patch 3 are made of carbon fiber prepreg made of the same type of carbon fiber fabric as the carbon fiber material layer 1. The first repair patch 2 and the second repair patch 3 are respectively disposed on both sides of the two carbon fiber material layers 1 and cover the linear gap 6. The carbon fiber material layer 1 is sandwiched between the first repair patch 2 and the second repair patch 3.

[0026] The lengths of the first repair patch 2 and the second repair patch 3 extend along the direction of the linear gap 6.

[0027] Two elastic filler blocks 7 are provided and are respectively fixed to the center of the first repair piece 2 and the second repair piece 3 near the carbon fiber material layer 1.

[0028] The elastic filler block 7 on the first repair patch 2, together with the first repair patch 2, forms a T-shaped structure. The elastic filler block 7 on the second repair patch 3, together with the second repair patch 3, forms a T-shaped structure.

[0029] Two elastic filler blocks 7 face each other and are used to jointly fill the linear gap 6. The adjacent ends of the two elastic filler blocks 7 are provided with wedge-shaped surfaces 5. In this embodiment, the linear gap 6 is a straight gap, and the elastic filler blocks 7 are polyurethane elastomers used to be compatible with the epoxy resin on the carbon fiber material layer 1.

[0030] Solid adhesive 4 is applied to the side of the first repair patch 2 and the second repair patch 3 facing the carbon fiber material layer 1, as well as the surface of the elastic filler block 7. Solid adhesive 4 adheres to the carbon fiber material layer 1. Solid adhesive 4 is an epoxy resin structural adhesive used to match the carbon fiber material layer 1.

[0031] Working principle: When it is necessary to repair the linear gap 6 on the carbon fiber material layer 1, the first repair piece 2 and the second repair piece 3 are respectively placed on both sides of the carbon fiber material layer 1, so that the two elastic filling blocks 7 are aligned with the planar linear gap 6. Since the elastic filling blocks 7 are fixed in the center of the repair piece, the first repair piece 2 and the second repair piece 3 will automatically be symmetrically distributed on both sides of the planar linear gap 6 without manual positioning.

[0032] The first repair piece 2 and the second repair piece 3 are pushed closer to each other. When the two elastic filling blocks 7 meet in the planar linear gap 6, the elastic filling blocks 7 deform due to the interaction and compression of the wedge-shaped surfaces 5, adapting to the specific shape of the planar linear gap 6 to achieve tight filling.

[0033] Continue pushing the first repair piece 2 and the second repair piece 3 until they are in complete contact with both sides of the carbon fiber material layer 1. At this point, the solid adhesive 4 fully adheres to the bonding surface. After the solid adhesive 4 has cured, the repair of the carbon fiber material layer 1 is completed.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A carbon fiber prepreg linear slot repair structure, comprising a carbon fiber material layer (1) having linear slots (6), characterized in that: It also includes a first repair piece (2), a second repair piece (3), an elastic filler block (7), and a solid adhesive (4); the carbon fiber material layer (1) is sandwiched between the first repair piece (2) and the second repair piece (3), and the first repair piece (2) and the second repair piece (3) cover the linear gap (6); Two elastic filler blocks (7) are provided and fixed to the center of the first repair piece (2) and the second repair piece (3) near the carbon fiber material layer (1), respectively; the two elastic filler blocks (7) face each other and are used to fill the linear gap (6) together; the solid adhesive (4) is applied to the side of the first repair piece (2) and the second repair piece (3) facing the carbon fiber material layer (1) and the surface of the elastic filler blocks (7), and the solid adhesive (4) adheres to the carbon fiber material layer (1).

2. The linear gap repair structure of carbon fiber prepreg according to claim 1, characterized in that: The first repair patch (2) and the second repair patch (3) are carbon fiber prepregs made of carbon fiber fabric of the same type as the carbon fiber material layer (1).

3. The linear gap repair structure for carbon fiber prepreg according to claim 1, characterized in that: Both elastic filler blocks (7) have wedge-shaped surfaces (5) at their close ends.

4. The linear gap repair structure of carbon fiber prepreg according to claim 1, characterized in that: The elastic filler block (7) on the first repair piece (2) together with the first repair piece (2) form a T-shaped structure.

5. The linear gap repair structure for carbon fiber prepreg according to claim 1, characterized in that: The elastic filler block (7) on the second repair piece (3) together with the second repair piece (3) form a structure with a T-shaped cross section.

6. The linear gap repair structure of carbon fiber prepreg according to claim 1, characterized in that: The lengths of the first repair patch (2) and the second repair patch (3) extend along the direction of the linear gap (6).

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