CN214499662U - Trapezoidal hybrid connection structure of carbon-fibre composite - Google Patents

Abstract

The utility model relates to a carbon fiber composite material trapezoidal hybrid connection structure, which comprises a left trapezoidal carbon fiber laminated plate (1), wherein the right side of the left trapezoidal carbon fiber laminated plate (1) is in a trapezoidal structure, the surface layer of the trapezoidal structure of the left trapezoidal carbon fiber laminated plate (1) is connected with an adhesive layer (5), the other side of the adhesive layer (5) is connected with a right trapezoidal carbon fiber laminated plate (2), the left side of the right trapezoidal carbon fiber laminated plate (2) is in a trapezoidal structure, and a countersunk head screw (3) penetrates through the carbon fiber laminated plate and the adhesive layer (5) at the joint of the left trapezoidal carbon fiber laminated plate (1) and the right trapezoidal carbon fiber laminated plate (2); and filling materials (4) are filled in the left trapezoidal carbon fiber laminated plate (1) and the right trapezoidal carbon fiber laminated plate (2). The utility model discloses can solve current connection structure yielding, the redundant, the limited problem of bearing capacity in surface, can be applied to the connection of large-scale sandwich structure thick plate extensively.

Description

Trapezoidal hybrid connection structure of carbon-fibre composite

Technical Field

The utility model relates to a carbon-fibre composite field, especially a trapezoidal mixed connection structure of carbon-fibre composite.

Background

The composite material as one new kind of material features that it is a material with new performance comprising two or more kinds of material with different properties and through physical and chemical process in macro scale. The fiber composite material consists of two parts, namely a reinforced fiber material and a matrix, wherein the reinforced fiber and the matrix are combined into a common composite material structure, such as a laminated plate or a honeycomb structure, through forming processes of winding, mould pressing, pultrusion and the like. The carbon fiber composite material has high specific strength, light weight and excellent corrosion resistance, and is widely applied to the fields of aerospace, high-speed trains, automobiles and the like.

The existing carbon fiber connection structure usually adopts a single connection mode, mainly comprising screw connection, adhesive connection, Z-pin connection and the like. The screw connection is a mechanical connection, which is safe and reliable, but easily causes stress concentration around the screw hole, and can cause fiber or matrix damage after a long time, thereby reducing the bearing performance of the material; the adhesive connection does not need to add an additional connecting piece, is light and efficient, has excellent sealing performance, but has low connection strength, and cannot be used for a main bearing structure; the Z-pin connection process is complex and inconvenient for engineering application. It is expected that hybrid connections will be the development of the future in order to meet the requirements for joint performance reliability in order to adapt to various stress environments.

The carbon fiber reinforced composite material laminated plate has the characteristics of specific strength, heat resistance, corrosion resistance, light weight and the like of isotropic materials such as far-super-metal materials and the like, and is characterized in that the materials adopt a reasonable layering design, the high strength of the reinforced fibers in the fiber direction is utilized, and the matrix serving as a continuous phase can fully wrap the reinforced fibers to play a role in bonding, balancing load, transferring stress and protecting the fibers. Therefore, the method of laying the carbon fibers directly determines the performance of the structure. Traditional carbon fiber U type structure and rectangle structure are formed by several carbon fiber board edgewise direct bonding usually when preparing, and structure corner fibre is discontinuous to stress concentration can appear in the corner when this is as load-carrying structure, produces the junction and comes unstuck, destruction such as laminated board layering, thereby very big reduction joint's joint strength and the whole bearing performance of structure, the stress structure easily breaks.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a carbon fiber composite material trapezoidal mixed connection structure, the connection structure can continuously lay carbon fibers on the basis of ensuring the structural strength, the rigidity and the sealing performance by using the preparation method of the laminated plate, and the excellent performance of the carbon fibers in the continuous process is fully utilized; meanwhile, the structure is ensured to be smooth in the joint surface, the whole structure is attractive, the joint redundancy is eliminated, the joint surface reaches certain roughness, and the coating is convenient; reduce the hole edge stress concentration and improve the sealing performance of the joint. The connecting structure is applied to a large-scale structure, so that the performance of the joint can be improved, the bearing capacity of the whole structure is enhanced, the surface of the joint is smooth, and the sealing performance is good.

The purpose of the utility model is realized through the following technical scheme: the utility model provides a trapezoidal hybrid connection structure of carbon-fibre composite, includes the trapezoidal carbon fiber laminated board in left side, the trapezoidal carbon fiber laminated board right side in left side is the trapezium structure, the trapezium structure top layer and the glue film of the trapezoidal carbon fiber laminated board in left side are connected, the glue film opposite side is connected with the trapezoidal carbon fiber laminated board in right side, the trapezoidal carbon fiber laminated board left side in right side is the trapezium structure, and the countersunk screw runs through the carbon fiber laminated board and the glue film of the trapezoidal carbon fiber laminated board in left side and the trapezoidal carbon fiber laminated board junction in right side, and the trapezoidal laminated board carbon fiber that the preparation obtained is continuous in the corner, and whole hybrid connection structure is central symmetry structure, can improve structure wholeness ability.

Furthermore, the left trapezoidal carbon fiber laminated plate and the right trapezoidal carbon fiber laminated plate are laid and formed by multiple layers of trapezoidal prepreg layers, carbon fibers are continuously and uninterruptedly laid, and excellent performance of the carbon fibers in continuity is fully utilized.

Furthermore, the glue layer is an adhesive material specially applied to the carbon fiber composite material.

The sunk screws are at least two and are arranged at the symmetrical positions of the bonding surfaces of the left carbon fiber laminated plate and the right carbon fiber laminated plate.

Furthermore, the left trapezoidal carbon fiber laminated plate and the right trapezoidal carbon fiber laminated plate are filled with fillers, so that the requirement of a large structure on plate thickness can be met.

Furthermore, the filling material is any one of a honeycomb core material and a low-density foam core material; so as to improve the integral rigidity of the structure and reduce the problem of stress concentration at the edge of the hole.

Furthermore, the countersunk head screws are at least two and are arranged at the symmetrical positions of the bonding surfaces of the left carbon fiber laminated plate and the right carbon fiber laminated plate, the surface of the connecting structure is smooth, the size and the number can be selected according to the size of an actual structure, the actual matching length and the placement mode are required, and the high-shear-resistant screws can be selected according to the detachable performance.

The utility model has the advantages of it is following: the utility model relates to a carbon fiber composite material hybrid connection structure, which avoids the defects and shortcomings of the traditional carbon fiber composite material connection structure, absorbs the advantages of a single connection structure and integrates the advantages, and provides a hybrid connection structure which has smooth surface, attractive appearance, high connection strength and good sealing performance and can be used for large-scale structures, and the joint surface can reach certain roughness; meanwhile, a new layering method is provided, the fibers of the trapezoidal carbon fiber structure can be ensured to be continuous, the strength and the rigidity of the carbon fiber composite material connecting structure are greatly improved, and the layering method can be applied to the preparation process of other carbon fiber laminated plates containing corner structures, such as rectangular structures.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the present invention;

in the figure: 1-left trapezoidal carbon fiber laminated plate, 2-right trapezoidal carbon fiber laminated plate, 3-countersunk head screw, 4-filler and 5-glue layer.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.

As shown in fig. 1, a carbon fiber composite material trapezoidal hybrid connection structure includes a left trapezoidal carbon fiber laminate 1, the right side of the left trapezoidal carbon fiber laminate 1 is in a trapezoidal structure, a surface layer of the trapezoidal structure of the left trapezoidal carbon fiber laminate 1 is connected to an adhesive layer 5, the other side of the adhesive layer 5 is connected to a right trapezoidal carbon fiber laminate 2, the left side of the right trapezoidal carbon fiber laminate 2 is in a trapezoidal structure, and a countersunk head screw 3 penetrates through the carbon fiber laminate and the adhesive layer 5 at the connection position of the left trapezoidal carbon fiber laminate 1 and the right trapezoidal carbon fiber laminate 2; the left trapezoidal carbon fiber laminated plate 1 and the right trapezoidal carbon fiber laminated plate 2 are filled with filler 4.

The working process of the utility model is as follows: according to the method, as shown in the figures 1-2, a left trapezoidal carbon fiber laminated plate 1 and a right trapezoidal carbon fiber laminated plate 2 are prepared respectively, three trapezoidal prepreg layers are sequentially laid in a special trapezoidal mold, then hot press molding is carried out, an internal filling material matched with the trapezoidal prepreg layers in shape is placed in a cavity of the laminated plate after molding, the filling material can be a honeycomb core material or a low-density foam core material, the requirement of a large structure on the plate thickness can be met by adding the filling material, the integral rigidity of the structure can be effectively improved, the stress concentration at a screw hole is reduced, the carbon fibers of the trapezoidal laminated plate prepared by laying according to the figure 1 are continuous at corners, and the integral performance of the structure can be improved.

Furthermore, the connecting area of the left trapezoidal carbon fiber laminated plate 1 and the right trapezoidal carbon fiber laminated plate 2 after forming is coated with an adhesive material specially used for connecting the carbon fiber laminated plates, the left trapezoidal carbon fiber laminated plate 1 and the right trapezoidal carbon fiber laminated plate 2 are spliced into a whole according to a diagram 1 by using a special tool and are subjected to hot compaction for a period of time after the adhesive material is cured to form an adhesive layer 5, holes are punched according to a diagram 2 after curing, a sunk screw 3 is pressed in, the left trapezoidal carbon fiber laminated plate 1 and the right tower trapezoidal carbon fiber laminated plate 2 are connected, the reliable matching is ensured, the installation is completed, and the carbon fiber composite material mixed connecting structure shown in the diagram 1 is obtained.

Claims (7)

1. The utility model provides a trapezoidal mixed connection structure of carbon-fibre composite which characterized in that: including trapezoidal carbon fiber laminated board (1) in left side, trapezoidal carbon fiber laminated board (1) right side in left side is the trapezium structure, the trapezium structure top layer and the glue film (5) of trapezoidal carbon fiber laminated board (1) in left side are connected, glue film (5) opposite side and right side trapezoidal carbon fiber laminated board (2) are connected, trapezoidal structure is on the left of trapezoidal carbon fiber laminated board in right side (2), and countersunk head screw (3) run through the carbon fiber laminated board and the glue film (5) of the trapezoidal carbon fiber laminated board in left side (1) and right side trapezoidal carbon fiber laminated board (2) junction.

2. The trapezoidal hybrid connecting structure of carbon fiber composite material according to claim 1, wherein: and filling materials (4) are filled in the left trapezoidal carbon fiber laminated plate (1) and the right trapezoidal carbon fiber laminated plate (2).

3. The trapezoidal hybrid connecting structure of carbon fiber composite material according to claim 1, wherein: the left trapezoidal carbon fiber laminated plate (1) is formed by laying and molding a plurality of layers of trapezoidal prepreg layers.

4. The trapezoidal hybrid connecting structure of carbon fiber composite material according to claim 1, wherein: the right trapezoidal carbon fiber laminated plate (2) is paved and formed by a plurality of trapezoidal prepreg layers.

5. The trapezoidal hybrid connecting structure of carbon fiber composite material according to claim 1, wherein: the glue layer (5) is an adhesive material specially applied to the carbon fiber composite material.

6. The trapezoidal hybrid connecting structure of carbon fiber composite material according to claim 1, wherein: the number of the countersunk screws (3) is at least two, and the countersunk screws (3) are arranged at the symmetrical positions of the bonding surfaces of the left carbon fiber laminated plate and the right carbon fiber laminated plate.

7. The trapezoidal hybrid connecting structure of carbon fiber composite material according to claim 2, wherein: the filling material (4) is any one of a honeycomb core material and a low-density foam core material.

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