A method of laying up, positioning and connecting a multilayered composite material of a thermoformed composite material of a metamaterial structure

Abstract

The application provides a multi-layered super material structure hot-pressing composite material and a laying positioning and connecting method, comprising N layers of composite material laying structure and (N-1) layers of functional material layers; wherein N>=2; the functional material layer comprises a super material film; a composite material needle (Z-directional reinforcing positioning cloth needle) of the same material is arranged between the composite material adhesive layer and the functional material layer. The application has the beneficial effects that: the Z-directional reinforcing composite material needle is arranged between the composite material laying structure and the functional material layer; the Z-directional strength is greatly enhanced, the connecting strength is enhanced, and the laying of the super material functional layer can be accurately positioned through the composite material needle.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of composite structure, and particularly relates to a method for laying and positioning multi-layer composite structure and reinforcing connection. BACKGROUND

[0002] In terms of composite lightweight and functional characteristics, pre-impregnated composite materials, special electromagnetic characteristic metamaterial film functional materials, and high-strength lightweight hard foam block composite applications are increasingly widely used. Such materials require extremely high laying, especially the metamaterial film needs to be precisely spliced without damaging the metal grid unit during laying, and the metal grids of different layers need to be precisely aligned during multi-layer metamaterial film laying. This results in very great laying difficulty, which is difficult to achieve in engineering. At the same time, the adhesion between the metamaterial film material and the pre-impregnated composite surface is relatively poor, and after local peeling, it is easy to quickly and massively spread and peel off. SUMMARY

[0003] The present application provides a multi-layer functional composite material with precise laying and consistent position, and a connection method for laying and positioning and simultaneously enhancing the interfacial adhesion strength thereof.

[0004] A Z-Pin reinforced composite sandwich structure includes N layers of composite material layup structure and (N-1) layers of functional material layer; wherein N≥3; the functional material layer includes a metamaterial film; a composite material adhesive layer and the functional material layer are provided with a composite material needle (Z-direction reinforcing positioning cloth needle) of the same material.

[0005] Further, the metamaterial film is composed of a thin film and a metal grid, which can be a flexible FPC circuit board or a hard circuit board with small thickness. The metal grid is a precisely designed repeating unit (such as copper circuit) of the same size, which is uniformly distributed in the thin film according to the designed gap. Each layer of the metamaterial film needs to be precisely spliced without damaging the metal grid unit during laying, and the metal grids of different layers need to be precisely aligned according to a certain rule during multi-layer metamaterial film laying. A plurality of Z-direction reinforcing positioning cloth needle positions are distributed in the metamaterial film, and a composite material needle is used for Z-direction positioning and reinforcement.

[0006] The composite material needle positioning has the following characteristics: 1) the Z-direction reinforcing positioning cloth needle positions of different layers of metamaterial film should be evenly staggered;

[0007] 2) the cloth needle positions are uniformly distributed in the gap area outside the metal grid, and the vertical and horizontal spacing of the cloth needle points of the same layer is controlled within 100-150 mm;

[0008] 3) The last layer of the composite material needle penetrates (N-1) layers of composite material. In addition to meeting the positioning requirements, the needle position should also meet the following requirements: there are composite material needles distributed at the four corners of the outer circle of the metamaterial film. The composite material needle penetrates (N-1) layers of composite material in the thickness direction, and penetrates most of the composite material layers. The Z-direction reinforcement connection is enhanced at the starting edge of the four corners, and the risk of delamination between the layers is reduced from the edge of the composite layer.

[0009] 4) The composite material needle should be pierced in the needle position.

[0010] Further, the upper composite layup structure includes prepreg + foam + prepreg.

[0011] Further, N=4, composite needle one is implanted after the laying of the first metamaterial film, and the height of the needle after implantation is 1-1.5 mm higher than the second metamaterial film after laying; the second composite needle is implanted after the laying of the second metamaterial film, and the height of the needle after implantation is 1-1.5 mm higher than the third metamaterial film after laying.

[0012] Further, the single piece of metamaterial film is 500*500mm.

[0013] A method for laying and connecting a multi-layer metamaterial structure of a thermally compressed composite material, including N layers of composite layup structure and (N-1) layers of functional material; wherein N≥3; the functional material layer includes a layer of metamaterial film; a composite material needle (Z-direction reinforcement positioning needle) is provided between the composite layup structure and the functional material layer;

[0014] First, lay the first layer of prepreg + foam layer + prepreg + first layer of metamaterial film, and then implant the pre-formed and processed composite material needle at the needle position of the metamaterial film;

[0015] The length of the composite material needle is controlled to be about 1-1.5 mm after pre-implantation, which is suitable for the first layer of metamaterial film to be laid;

[0016] After laying the second layer of metamaterial film, the second layer of metamaterial film is laid, and the composite material needle is about 1-1.5 mm after laying, which is suitable for the third layer of metamaterial film to be laid;

[0017] And so on…

[0018] After laying, forming, and curing, the product is obtained.

[0019] The beneficial effects of the technical solutions of the present application are: the composite material layer structure and the functional material layer are provided with Z-direction reinforced composite material needles of the same material as the prepreg composite material; the Z-direction strength is greatly enhanced, the connection strength is enhanced; and the composite material needles can accurately position the laying of the metamaterial functional layer. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a typical multi-layer composite material layer structure in the present application, and the interlayer intention is intended to be shown;

[0021] Figure 2 is a typical metamaterial mesh film schematic diagram in the present application;

[0022] Figure 3 is a typical metamaterial mesh film needle arrangement schematic diagram in the present application; Figure 1 ;

[0023] Figure 4 is a typical metamaterial mesh film needle arrangement schematic diagram in the present application; Figure 2 ;

[0024] Figure 5 is a typical metamaterial mesh needle arrangement schematic diagram in the present application; Figure 3 ;

[0025] Figure 6 is a typical metamaterial mesh needle arrangement schematic diagram in the present application; Figure 1 ;

[0026] Figure 7 is a typical metamaterial mesh needle arrangement schematic diagram in the present application; Figure 2 ;

[0027] Figure 8 is a typical metamaterial mesh needle arrangement schematic diagram in the present application; Figure 3 ;

[0028] Figure 9 is a typical metamaterial mesh needle arrangement schematic diagram in the present application; Figure 4 ;

[0029] Figure 10 is a typical metamaterial mesh needle arrangement schematic diagram in the present application; Figure 5 ;

[0030] 1-Prepreg one; 2-foam one; 3-Prepreg two; 4-Super material one; 5-Prepreg three; 6-foam two; 7-Prepreg four; 8-Super material two; 9-Prepreg five; 10-foam three; 11-Prepreg six; 12-Super material three; 13-Prepreg seven; 14-foam four; 15-Prepreg eight; 16-Z-directional reinforcement positioning cloth needle one (composite material needle one); 17-Z-directional reinforcement positioning cloth needle two (composite material needle two); 41-film; 42-metal mesh; 43-cloth needle position one; 44-cloth needle position two. Embodiments

[0031] The present application is further described below in conjunction with the accompanying drawings:

[0032] Reference Figure 1 , Figure 1 A most typical multi-layer composite layup structure interlayer intention is shown; the composite layup structure comprises prepreg one 1, foam one 2, prepreg two 3, super material film one 4, prepreg three 5, foam two 6, prepreg four 7, super material film two 8, prepreg five 9, foam three 10, prepreg six 11, super material film three 12, prepreg seven 13, foam four 14, and prepreg eight; that is, four layers of composite layup structure (prepreg + foam + prepreg) + three layers of super material in the middle, after laying up, forming and curing, the product is obtained.

[0033] Specifically,

[0034] First, the first layer of prepreg one 1 + foam one 2 + prepreg two 3 + the first layer of super material film one 4 is laid up, and the preformed and processed composite material needle is implanted at the holeable position of the super material;

[0035] The length of the composite material needle is controlled to be exposed by about 1-1.5mm after pre-implantation, which is suitable for the positioning and laying of the second layer of super material film;

[0036] Specifically, the length of the composite material needle is controlled to be exposed by the thickness of prepreg three 5 + the thickness of foam two 6 + the thickness of prepreg four 7 + (1~1.5mm) thickness after pre-implantation, which is suitable for the positioning and laying of the second layer of super material film two 8;

[0037] After the second layer of super material film is laid up, the same is true……

[0038] After laying up, forming and curing, the product is obtained.

[0039] The technical scheme of the present application can realize:

[0040] 1) The positioning accuracy is controlled in place;

[0041] 2) The Z-direction of the metamaterial film is enhanced, and the connection strength is enhanced.

[0042] Referring to Figure 2 , it is a schematic diagram of a typical metamaterial mesh film; it is mainly composed of a film 41 and a metal mesh 42; the metal mesh 42 is a repeating unit with the same size and spacing, and is uniformly distributed on the film 41.

[0043] Referring to Figure 3 , it is a typical metamaterial mesh film needle arrangement schematic Figure 1 ;

[0044] , it is a schematic diagram of the first layer of the typical metamaterial mesh film needle arrangement; it is mainly composed of a film 41 and a metal mesh 42; the film 41 is uniformly distributed with the metal mesh 42 (such as copper circuit) ;

[0045] The metamaterial film is composed of a flexible FPC circuit board or a hard circuit board with small thickness (thickness less than 0.5 mm) ;

[0046] Taking the flexible FPC circuit board as an example, the copper circuit is periodically distributed on the surface of the polyimide or polyester insulating film.

[0047] The inner four corners of the outermost circle of the film 41 each have a needle arrangement position one 43.

[0048] Referring to Figure 4 , it is a typical metamaterial mesh film needle arrangement schematic Figure 2 ; it is a schematic diagram of the second layer of the typical metamaterial mesh film needle arrangement; it is mainly composed of a film 41 and a metal mesh 42; wherein the film 41 has a needle arrangement position one 43 and a needle arrangement position two 44.

[0049] Referring to Figure 5 , it is a typical metamaterial mesh film needle arrangement schematic Figure 3 ; it is a schematic diagram of the first layer of the typical metamaterial mesh film needle arrangement; it is mainly composed of a film 41 and a metal mesh 42; wherein the metal mesh 42 has a uniformly distributed needle arrangement position two 44 between the gaps.

[0050] Referring to Figure 6 , the typical metamaterial mesh needle arrangement between layers in the present application Figure 1 , the prepreg one 1 + foam one 2 + prepreg two 3 + metamaterial one 4 is the first overall lay-up; after the metamaterial one is laid, the composite material needle 16 is laid on the surface, the composite material needle 16 protrudes upward, and then the prepreg three and the subsequent lay-up are laid in turn.

[0051] Referring to Figure 7 , the typical metamaterial mesh needle arrangement between layers in the present application Figure 2, after the first layer of metamaterial film is laid, the height of the protruding composite needle 16 = subsequent laying of prepreg three 5 + foam two 6 + prepreg four 7 + metamaterial two 8 + (1-1.5mm).

[0052] Referring to Figure 8 , the typical interlayer schematic of the grid cloth needle in the present application Figure 3 , on the basis of Figure 7 , after the second layer of metamaterial film is laid, the second time of implanting the composite needle, the uniformly distributed cloth needle position two 44 position, the bottom end is implanted to the bottom prepreg one 1 of the first layer, the composite needle 17 protrudes upward, and then subsequent layers are laid in turn.

[0053] Referring to Figure 9 , the typical interlayer schematic of the grid cloth needle in the present application Figure 4 , the height of the protruding composite needle 17 = subsequent laying of prepreg nine 9 + foam three 10 + prepreg eleven 11 + metamaterial three 12 + protruding 1-1.5mm.

[0054] The Z-directional reinforcing positioning cloth needle 17 of the metamaterial two 8 and the metamaterial three 12; namely, on the basis of Figure 8 , subsequent layers of prepreg nine 9 + foam three 10 + prepreg eleven 11 + metamaterial three 12 are laid in turn.

[0055] Referring to Figure 10 , the typical interlayer schematic of the grid cloth needle in the present application Figure 5 , namely, the schematic of all laying; the Z-directional reinforcing positioning of the metamaterial one 4 and the metamaterial two 8, cloth composite needle 16; the Z-directional reinforcing positioning of the metamaterial one 4, the metamaterial two 8 and the metamaterial three 12, cloth composite needle two 17.

[0056] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0057] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the present application.

[0058] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should be considered as disclosed by the present application.

Claims

1. A multi-layer metamaterial structure hot-pressed composite material, comprising at least N layers of composite layer structures and (N-1) layers of functional material layers; wherein N>3; the functional material layers comprise at least one layer of metamaterial film; the composite layer structure comprises prepreg + foam + prepreg; the composite layer structure and the functional material layer are connected and positioned in the Z direction using composite pins; characterized in that the metamaterial film is composed of a flexible FPC circuit board or a hard circuit board with a thickness of less than 0.5 mm and a metal mesh; wherein the composite pin positioning has: 1) the Z-direction reinforcing pin point position of different layers of metamaterial film should be uniformly staggered; 2) the pin point position is uniformly distributed in the gap area outside the metal mesh, and the vertical and horizontal spacing of the pin points in the same layer is controlled to be 100-150 mm; 3) the composite pins of the last layer of metamaterial film penetrate (N-1) layers of composite material, and the pin point position of this layer should meet the requirements of the pin point positioning position, and there should be composite pins distributed at the four corners of the outer circle of the metamaterial film, which penetrate most of the composite material layers in the thickness direction and are connected in the Z direction at the starting edge of the four corners; 4) the composite pins are placed in the pin point position. N=4, the first composite pin is implanted after the first layer of metamaterial film is laid, and the height of the first composite pin is ensured to be 1-1.5 mm higher than the second layer of metamaterial film after the second layer of metamaterial film is laid; the second composite pin is implanted after the second layer of metamaterial film is laid, and the height of the second composite pin is ensured to be 1-1.5 mm higher than the third layer of metamaterial film after the third layer of metamaterial film is laid.

2. A composite material as claimed in claim 1, characterised in that, The length and width of the single block of the metamaterial film are 500*500 mm.

3. A composite material as claimed in claim 1 or 2, characterised in that, 4. The laying, positioning and connecting method of the composite material in claim 1, N=4, comprising the following steps: characterized in that after laying the first composite layer and the first layer of metamaterial film, implant the first processed composite pin at the metamaterial pin point position one; the length of the pre-implanted first composite pin should be controlled to be 1-1.5 mm after the second layer of metamaterial film is laid, so that the second layer of metamaterial film can be easily positioned and laid; after laying the second layer of metamaterial film, implant the second processed composite pin at the metamaterial pin point position two, and the bottom end is implanted to the bottom prepreg of the first layer; then lay the subsequent third composite layer and the third layer of metamaterial film in turn; the length of the pre-implanted second composite pin should be controlled to be 1-1.5 mm after the third layer of metamaterial film is laid; finally, lay the fourth composite layer; after laying, forming and curing, the product is obtained. ​

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