CN102303427B - Dual-interlayer symmetrical multi-pyramid configuration three-dimensional integrally-braid lattice composite material and preparation method thereof - Google Patents

Abstract

The invention relates to a three-dimensional overall braided lattice composite material with a double-interlayer symmetrical polygonal pyramid structure and a preparation method thereof. The composite material is composed of an upper panel layer, a middle panel layer, a lower panel layer and a lattice core layer arranged between the upper, middle, middle and lower panel layers. It is characterized in that the upper, middle and lower panel layers form a double sandwich structure, and the lattice core layer is a space network truss structure composed of symmetrical polygonal pyramid configuration units with interconnected pores and periodically arranged, and the lattice core The layer and the upper, middle and lower panel layers are weaved, interspersed, wound and sewed into a whole according to the design rules, and are formed by one-time grease injection using a resin transfer process; the preparation method of the present invention includes: 1) preparing the upper, middle and lower panel layers; 2) ) drilling pinholes; 3) preparing a dot matrix core layer; 4) curing and molding the resin. Compared with the existing composite materials with sandwich structure, the composite material prepared by the invention has better integrity, superior mechanical properties, lighter weight, higher bearing efficiency and better functionality.

Description

Three-dimensional overall braided lattice composite material with double-interlayer symmetrical polygonal pyramid structure and its preparation method

technical field

The invention relates to a textile composite material and its preparation technology, in particular to a three-dimensional integral braided lattice composite material with a double-interlayer symmetrical polygonal pyramid configuration and a preparation process thereof, belonging to the fields of engineering material preparation and structural design.

Background technique

Due to the outstanding advantages of high specific stiffness, sandwich structure composite materials are more and more used in the manufacturing sectors of aerospace and ships, and are also receiving more and more attention in engineering. During the manufacturing process of sandwich structures, the quality of the panels and their bonding strength with the sandwich layer are the key factors affecting the performance of the sandwich structure. In the existing sandwich structure composite materials, the upper and lower panels are usually laminated and laminated. The shear strength between the panels is low, and delamination damage is easily occurred between the panels when the force is applied, and the mechanical properties of bending resistance are poor. At the same time, another failure mode of the sandwich structure is the bond degumming failure between the face plate and the sandwich layer. Due to the single interface structure between the middle sandwich layer of the composite material product and the upper and lower face plates, it is easy to cause the upper and lower face plates to be damaged. The layer and the middle sandwich layer are degummed and delaminated and peeled off, which cannot be used normally.

Common sandwich layers include honeycomb materials and foam materials, etc. These materials have very weak shear resistance. In order to match the shear strength of the sandwich layer, the panels must usually be very thin, which cannot give full play to the high-strength tensile capacity of high-performance fiber panels. . In recent years, a new type of lattice material with high specific strength and high specific stiffness has been developed internationally. Lattice material is an ordered ultra-light porous material designed by simulating the molecular lattice configuration. Similar to the existing space grid, the force of each beam inside it can be designed to be in one direction. Stretch or compress without bending deformation and obtain the lowest weight index under the same load. Common topological configurations of lattice materials include Kagome structure, periodic truss structure, quadrangular pyramid structure, octahedral structure, tetrahedron and full triangular framework. However, most of the common lattice materials are metal materials at present, and there are few fiber-reinforced composite materials, and there is also a lack of mature preparation technology for lattice composite materials. For the existing single sandwich structure lattice composite materials, the lattice cores do not have a high height, that is, the height of the cores in the sandwich is limited, generally not exceeding 30mm, and the lattice cores lack effective support points, When the interlayer height reaches more than 20 mm, the core is prone to instability and shear failure occurs, which ultimately makes the composite structure unusable. Therefore, it is necessary to design and prepare a new type of sandwich structure functional lattice material to meet the structural design requirements of ultra-light structure, optimal configuration design, and multi-functional structure in aerospace and other fields.

Contents of the invention

Aiming at the deficiencies of the prior art, the object of the present invention is to propose a three-dimensional integral braided lattice composite material with a double-interlayer symmetrical polygonal pyramid configuration and its preparation method. The composite material has good structural integrity, lighter weight, and greatly improves the structure The load-bearing efficiency, structural stability, compression resistance, shear resistance, bending resistance and other mechanical properties have been significantly enhanced, and it can easily achieve stealth, intelligence and other multi-functional requirements. The preparation method has simple process, little environmental pollution, high production efficiency and relatively low cost.

The present invention solves the technical scheme of described composite material technical problem as follows:

A three-dimensional overall braided lattice composite material with double-interlayer symmetrical polygonal pyramid configuration designed by the present invention is composed of an upper panel layer, a middle panel layer, a lower panel layer and points arranged between the upper middle panel layer and the middle lower panel layer. Composed of matrix core layers, it is characterized in that: the upper, middle, and lower panel layers form a double sandwich structure, and the lattice core layer is a space network truss structure composed of symmetrical polygonal pyramid configuration units with interconnected pores and periodically arranged , and the lattice core layer and the upper, middle and lower panel layers are weaved, interspersed, wound and sewn into a whole according to the design rules, and are formed by one-time grease injection by resin transfer technology.

A further feature of the present invention is that the upper panel layer, the middle panel layer and the lower panel layer are prepared by using a four-step three-dimensional multi-directional integral weaving process technology and weaving a three-dimensional multi-directional integral weaving prefabricated part from high-performance fiber materials; The high-performance fiber material refers to one of carbon fiber, Kevlar fiber, glass fiber, aramid fiber, high-strength polyethylene fiber, basalt fiber and the like. The three-dimensional multi-directional integral braided preform refers to a three-dimensional multi-directional integral braid with a specific braiding angle, a specific fiber volume content, and a specific weaving structure. The range of the braiding angle is between 0°-50°, the range of the fiber volume content is between 20%-70%, and the braiding structure refers to three-dimensional four-way, three-dimensional five-way, three-dimensional six One of the three-dimensional and seven-way braided structures. The upper, middle and lower panel layers can use the same three-dimensional multi-directional integral braid of high-performance fiber materials, or can choose three-dimensional multi-directional integral braids of different high-performance fiber materials.

The present invention is also characterized in that the dot matrix core layer and the upper panel layer, the middle panel layer and the lower panel layer are a completely non-separated overall structure, and there is no peeling phenomenon between the panel layer and the core layer. The panel layer, the middle and lower panel layers form a double sandwich structure; the lattice core layer is a space network truss structure composed of symmetrical polygonal pyramid configuration units with interconnected pores and periodically arranged; the symmetrical polygonal pyramid configuration is Refers to one of the configurations of symmetrical triangular pyramids, symmetrical quadrangular pyramids, and symmetrical pentagonal pyramids.

The present invention is also characterized in that the dot-matrix core layer is formed by weaving, interspersing, winding and sewing the core yarn with the upper, middle and lower panel layers in three-dimensional space according to design rules. The core yarn refers to one of the yarns made of organic fibers such as carbon fiber, Kevlar fiber, aramid fiber, and glass fiber; Pyramid configuration and the spatial orientation angle of the core yarn; the spatial orientation angle refers to the angle between the direction in which the core yarn is weaved and interspersed in space and the vertical axis, and its size range is 0°-90° Between; the configuration of the lattice core, the spatial orientation angle of the core yarn can be set arbitrarily to form different structures.

The present invention is also characterized in that the dot matrix core has a complete centrosymmetric structure between the upper, middle, and lower deck layers, and the core yarns are interwoven and wound on the middle deck layer, and the middle deck layer plays an effective supporting role. The height of the dot matrix core layer has a large adjustable range, which can reach between 0-80mm, and the overall height range formed by the dot matrix core layer connecting the upper, middle and lower panel layers is between 0-120mm.

The present invention is also characterized in that the outer surfaces of the upper, middle and lower panel layers of the composite material structure are all flat and smooth, and the shape and size are accurate, without secondary processing and without causing damage to the composite material.

The preparation method of the three-dimensional overall braided lattice composite material with double interlayer symmetrical polygonal pyramid structure is characterized in that the preparation is carried out according to the following steps:

(1) Prepare upper, middle and lower panel layers

The four-step three-dimensional multi-directional integral weaving process technology is adopted, and the three-dimensional multi-directional integral weaving prefabricated parts are woven with high-performance fiber materials to prepare the upper panel layer, the middle panel layer and the lower panel layer. The high-performance fiber material is one of carbon fiber, Kevlar fiber, glass fiber, aramid fiber, high-strength polyethylene fiber, basalt fiber, etc.; , a specific fiber volume content, a three-dimensional multi-directional overall braided fabric with a specific weaving structure.

(2) Drill pinholes

According to the design rules, use a drilling machine to vertically drill pinholes at the corresponding positions of the upper, middle and lower panel layer prefabricated parts, the diameter of the pinholes matches the diameter of the core yarn; the pinhole density is 500-8000 holes/square meter. The design rule is determined according to the symmetrical polygonal pyramid configuration of the lattice core and the spatial orientation angle of the core yarn. The symmetrical polygonal pyramid configuration refers to one of symmetrical triangular pyramids, symmetrical quadrangular pyramids, and symmetrical pentagonal pyramids. The spatial orientation angle refers to the angle between the direction in which the core yarns weave and intersect in space and the vertical axis.

(3) Preparation of lattice core layer

According to the designed perforation, the core yarn is woven, interspersed, intertwined and sewed between the upper, middle and lower panel layer prefabricated parts to form a hollow overall structure. The interspersed stitching density is consistent with the pinhole density, which is 500-8000 threads/square meter , in this way, a three-dimensional overall braided lattice composite material preform with double sandwich symmetrical polygonal pyramid configuration is prepared. For the symmetrical quadrangular pyramid configuration, the path of the core yarn weaving and interspersing in the upper, middle and lower deck layers is as follows:

a. at first allow yarn to set off from the first node of the first symmetrical quadrangular pyramid unit cell at the corners of the upper surface of the upper panel layer, pass through the lower surface of the upper panel layer, and pass through the second node of the middle panel layer, Then penetrate to the lower surface of the lower panel layer to reach the third node. The yarn reaches the fourth node from the lower surface of the lower panel layer along the Y direction, and then the yarn reverses from bottom to top and passes through the upper surface of the lower panel layer, the nodes of the middle panel layer, and the upper surface of the upper panel layer. reach the fifth node. The yarn reaches the sixth node from the upper surface of the upper panel layer along the X direction, and the yarn is reversed again from top to bottom and passes through the lower surface of the upper panel layer, the node of the middle panel layer, and the lower node of the lower panel layer. The surface reaches the seventh node. The yarn runs along the Y direction on the lower surface of the lower panel layer, reaches the eighth node, and then passes through the upper surface of the lower panel layer, the node of the middle panel layer and the upper surface of the upper panel layer from bottom to top, and finally reaches the eighth node. Nine nodes, during the weaving process, four yarns along the diagonal direction are interwoven and entwined at the nodes of the middle panel layer, so that the first yarn with a symmetrical quadrangular pyramid unit cell core configuration is completed Thread weaving interspersed process. Then, the yarn reaches the node of the next symmetrical quadrangular pyramid unit cell along the upper surface of the upper panel layer, and is weaved and interspersed according to the sequence of the paths again, and wound and sewed.

b. And so on, according to the core yarn weaving and interweaving method in step a, based on the unit cell, weaving and interweaving along the length direction of the panel, winding and sewing, weaving transition on the end section of the panel, and then along the panel. In the length direction, the yarns of the core configuration of the next layer are braided and interspersed to prepare a lattice core layer of a double sandwich symmetrical quadrangular pyramid configuration.

(4) Resin curing molding

After the weaving and interweaving of the core yarn is completed, the prefabricated part is collapsed and stretched. Overcome the situation of uneven yarn tightness in the weaving and interspersed process. The braided double-interlayer symmetrical polygonal pyramid configuration three-dimensional overall braided lattice composite material preform is injected with resin through the resin transfer process, so that the upper, middle and lower panel layers and lattice core layers are fully impregnated with resin, and placed in the In the oven, after compounding and curing, the double-interlayer symmetrical polygonal pyramid sandwich three-dimensional integral braided lattice composite material of the present invention is obtained; the resin adopts one of epoxy resin, phenolic resin, unsaturated resin, vinyl resin, etc. kind.

Compared with the prior art, the present invention has the following advantages and outstanding effects: the present invention adopts three-dimensional multi-directional integral weaving technology to prepare upper, middle and lower panel layers with three-dimensional multi-directional integral weaving structure, which fundamentally overcomes the traditional laying Layers, the fatal flaws of low interlayer shear strength and easy delamination of the laminated structure panel layers greatly improve the mechanical properties of the panel layers. The present invention adopts three-dimensional weaving, interweaving, winding and suturing technology to form a completely inseparable overall structure between the lattice core layer and the upper panel layer, the middle panel layer and the lower panel layer, completely avoiding the traditional sandwich structure. The degumming and delamination of the core layer are peeled off. The present invention adopts a double sandwich lattice structure, which overcomes the weakness of the limited height of the sandwich core and the lack of effective support points in the existing single sandwich structure. In the double sandwich lattice structure, the lattice core is completely central Symmetrical structure, the middle panel layer plays an effective supporting role for the lattice core, the height of the core is significantly increased, with greater porosity, its density is greatly reduced, and the load-bearing efficiency of the material is improved. At the same time, the pores of the composite material prepared by the present invention are connected, which facilitates the design and realization of multi-functions, such as wiring, heat insulation, oil storage, shock absorption, electromagnetic wave absorption, sound absorption, and battery configuration. The present invention adopts resin transfer technology for one-time grease injection molding, the outer surfaces of the upper, middle and lower panel layers are smooth and smooth, the shape, structure and size are accurate, no secondary processing is required, and the composite material will not be damaged, so that the composite material structure has excellent overall performance. Generally speaking, the three-dimensional overall braided lattice composite material with double-interlayer polygonal pyramid configuration prepared by the present invention has better integrity, superior mechanical properties, lighter weight, higher load-bearing efficiency and better functionality than traditional sandwich structure composite materials. good. It can be applied to various high-tech product fields such as aerospace, navigation, national defense equipment, stealth and intelligence.

Within the scope of the applicant's search, there have been no relevant literature reports on the three-dimensional integral braided lattice composite material with double-interlayer symmetrical polygonal pyramid configuration and its preparation method of the present invention.

Description of drawings

Fig. 1 is a schematic structural view of a three-dimensional overall braided lattice composite material with a double sandwich symmetrical quadrangular pyramid configuration provided by the present invention.

Fig. 2 is an enlarged view of the composite material unit cell in a symmetrical quadrangular pyramid configuration in Fig. 1 .

Fig. 3 is an enlarged view of the lattice core unit cell in a symmetrical quadrangular pyramid configuration in Fig. 1 .

Fig. 4 is a schematic diagram of the structure of the lattice core layer of the present invention.

Fig. 5 is a schematic diagram of the core yarn weaving interpenetration and winding suture path of the present invention.

1-upper panel layer; 2-middle panel layer; 3-lower panel layer; 4-lattice core; 5-square pyramid configuration unit cell; 6-core yarn; 7-spatial orientation of core yarn Angle; 8-first node; 9-second node; 10-third node; 11-fourth node; 12-fifth node; 13-sixth node; 14-seventh node ; 15-eighth node; 16-ninth node;

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of the structure of a double sandwich symmetrical quadrangular pyramid configuration three-dimensional integral braided lattice composite material provided by the present invention, which consists of an upper panel layer 1, a middle panel layer 2, a lower panel layer 3 and upper, middle, lower The lattice core layer 4 between the panel layers is characterized in that: the upper middle panel layer and the middle and lower panel layer form a double sandwich structure, and the lattice core layer is composed of a symmetrical quadrangular pyramid configuration with interlinked pores periodically arranged The space network truss structure composed of unit cells 5, and the lattice core layer and the upper, middle and lower panel layers are woven, interspersed, wound and sewn into a whole according to the design rules, and are formed by one-time grease injection by resin transfer technology.

The present invention simultaneously designs the preparation method of the three-dimensional overall braided lattice composite material of the double-interlayer symmetrical quadrangular pyramid configuration, which is characterized in that the preparation is carried out according to the following steps:

(1) Prepare upper, middle and lower panel layers

According to the four-step three-dimensional multi-directional integral weaving technology, high-performance fiber materials are used to weave three-dimensional multi-directional integral weaving prefabricated parts to prepare the upper panel layer, middle panel layer and lower panel layer. The high-performance fiber material selected is T3006k carbon fiber. The braiding angle of the three-dimensional multi-directional integral braided preform is 25°, the fiber volume content is 60%, and the braided structure is a three-dimensional five-directional braided structure. The upper, middle and lower panel layers are made of the same three-dimensional five-directional integral braided carbon fiber material, and the outer dimensions of the prefabricated parts of the upper, middle and lower panel layers are 500mm (length) × 380mm (width) × 6mm (thickness).

(2) Drill pinholes

The configuration of the lattice core is a symmetrical quadrangular pyramid configuration, and the spatial orientation angle 7 of the core yarn is 45°. Use a drilling machine to vertically drill pinholes on the upper, middle, and lower panel layers according to the needle pitch x row spacing of 30mm x 30mm. The diameter of the pinholes is 1.5mm, and the pinhole density is vertically penetrating the core yarn per square meter. 1100 roots. For the upper and lower panel layers, starting from the corners of the prefabricated part, first drill the first hole at a position 10mm away from the length direction and width direction of the panel layer, and then drill the first row of holes along the length direction of the panel layer, After reaching the end face of the panel layer, transition to the next row along the width direction of the panel layer. Repeat this cycle until complete. For the middle panel layer, in order to ensure that the drilling holes in the middle panel layer are staggered at equal intervals from the drilling holes in the upper and lower panel layers. The first drilling position is 25mm away from the length direction and the width direction, and then similar to the drilling sequence of the upper and lower panel layers, drill holes at a distance of 30mm along the length and width directions. In this way, 17×13 drill holes are formed on the upper, middle and lower panel layers whose external dimensions are 500mm×380mm×6mm. 16×12 drill holes are formed on the middle panel layer, and the spacing between the holes is 30mm.

(3) Core layer preparation:

According to the perforation design of the upper, middle and lower panel layers, the layer height of the core layer is designed to be 42.42mm. Core yarn 6 selects T30012k carbon fiber for use. The core yarn is weaved obliquely and interspersed between the upper, middle and lower panel layers, and vertically wound and sewed on the upper, middle and lower panel layers. In this way, the core yarn weaves the lattice core layer and the upper, middle and lower panel layers into a hollow integral structure, and prepares a three-dimensional overall braided lattice composite material preform in a double-interlayer symmetrical quadrangular pyramid configuration. Referring to Fig. 5, the path of the core yarn weaving and interspersing in the upper, middle and lower panel layers is as follows:

a. first let the yarn start from the first node 8 of the first symmetrical quadrangular pyramid unit cell at the corner of the upper surface of the upper panel layer, pass through the lower surface of the upper panel layer, and pass through the second node of the middle panel layer 9, and then penetrate to the lower surface of the lower panel layer to reach the third node 10. The yarn reaches the fourth node 11 from the lower surface of the lower panel layer along the Y direction, and then the yarn reverses from bottom to top and passes through the upper surface of the lower panel layer, the node 9 of the middle panel layer, and the upper panel layer. The upper surface reaches the fifth node 12 . The yarn reaches the sixth node 13 from the upper surface of the upper panel layer along the X direction, and the yarn is reversed again from top to bottom and penetrates the lower surface of the upper panel layer in turn, the node 9 of the middle panel layer, and the lower panel layer The lower surface of reaches the seventh node 14. The yarn reaches the eighth node 15 along the Y direction on the lower surface of the lower panel layer, then passes through the upper surface of the lower panel layer from bottom to top, the middle panel layer node 9 and the upper surface of the upper panel layer, and finally Reaching the ninth node 16, during the weaving and interweaving process, the four yarns along the diagonal direction are interwoven and intertwined at the node 9 of the middle panel layer, so that the first symmetrical quadrangular pyramid unit cell core is completed The configuration of the yarn weaving interpenetrating process. Then, the yarn reaches the node of the next symmetrical quadrangular pyramid unit cell along the upper surface of the upper panel layer, and is weaved and interspersed according to the sequence of the paths again, and wound and sewed.

b. And so on, according to the core yarn weaving and interweaving method in step a, based on the unit cell, weaving and interweaving along the length direction of the panel, winding and sewing, weaving transition on the end section of the panel, and then along the panel. In the length direction, the yarns of the core configuration of the next layer are braided and interspersed to prepare a lattice core layer of a double sandwich symmetrical quadrangular pyramid configuration.

(4) Resin curing molding

After the weaving and interweaving of the core yarn is completed, the prefabricated part is collapsed and stretched. Overcome the situation of uneven yarn tightness in the weaving and interspersed process. The woven double-interlayer polygonal pyramid configuration three-dimensional overall braided lattice composite material preform is injected with epoxy resin through the resin transfer process, so that the upper, middle and lower panel layers and lattice core layers are fully impregnated with epoxy resin , placed in an oven, aged at 80° C. for 3 hours, and after the resin is cured and molded, the three-dimensional overall braided lattice composite material with double-interlayer symmetrical quadrangular pyramid configuration of the present invention is obtained.

Claims (9)

1. A three-dimensional overall braided lattice composite material with double-layer symmetrical polygonal pyramid structure, the composite material is composed of an upper panel layer (1), a middle panel layer (2) and a lower panel layer (3) as well as upper middle and middle panels. Composed of a lattice core layer (4) between the lower panel layers, it is characterized in that the upper, middle and lower panel layers form a double sandwich structure, and the lattice core layer is a symmetrical polygonal pyramid structure with interconnected pores periodically arranged A space network truss structure composed of type unit cells (5), and the lattice core layer and the upper, middle and lower panel layers are weaved, interspersed, wound and sewn into a whole according to the design rules, and are formed by one-time grease injection by resin transfer process; Before making the dot matrix core layer, perform the step of drilling pinholes, specifically: According to the design rules, use a drilling machine to vertically drill pinholes at the corresponding positions of the upper, middle and lower panel layer prefabricated parts, the diameter of the pinholes matches the diameter of the core yarn; the pinhole density is 500-8000 hole/square meter; said design law refers to determine according to the spatial orientation angle of the symmetrical polygonal pyramid configuration of lattice core, core yarn; Described symmetrical polygonal pyramid configuration refers to symmetrical triangular pyramid, symmetrical quadrilateral One of pyramidal and symmetrical pentagonal pyramid configurations; the spatial orientation angle of the core yarn refers to the angle between the direction in which the core yarn is weaved and interspersed in space and the vertical axis; The making of described dot matrix core layer adopts following steps: According to the designed perforation, the core yarn is woven, inserted, intertwined, and sewed between the upper, middle, and lower panel layer prefabricated parts to form a hollow overall structure. The stitching density is consistent with the density of the pinholes drilled on the panel, which is 500- 8000 threads/square meter; for the symmetrical quadrangular pyramid configuration, the path of the core yarn weaving and interspersing in the upper, middle and lower deck layers is as follows: First let the yarn start from the first node (8) of the first symmetrical quadrangular pyramid unit cell at the corner of the upper surface of the upper panel layer, pass through the lower surface of the upper panel layer, and pass through the second node of the middle panel layer (9), and then interspersed to the lower surface of the lower panel layer to reach the third node (10); the yarn reaches the fourth node (11) from the lower surface of the lower panel layer along the Y direction, and then the yarn reverses from The upper surface of the lower panel layer and the node (9) of the middle panel layer are inserted obliquely from bottom to top, and the upper surface of the upper panel layer reaches the fifth node (12); the yarn runs from the upper surface of the upper panel layer along the X direction Arriving at the sixth node (13), the yarn is reversed again from top to bottom and passes through the lower surface of the upper panel layer, the node (9) of the middle panel layer, and the lower surface of the lower panel layer reaches the seventh node ( 14); the yarn reaches the eighth node (15) along the Y direction on the lower surface of the lower panel layer, and then passes through the upper surface of the lower panel layer from bottom to top, the middle panel layer node (9) and the upper The upper surface of the panel layer finally reaches the ninth node (16). During the weaving and interweaving process, the four yarns along the diagonal direction are interwoven and intertwined at the node (9) of the middle panel layer. In this way, The yarn weaving and interpenetrating process of the first symmetrical quadrangular pyramidal unit cell configuration is completed; then, the yarn reaches the node of the next symmetrical quadrangular pyramidal unit cell along the upper surface of the upper panel layer, again following the path described Sequential weaving, interspersing, winding and suturing; And so on, according to the core yarn weaving and interweaving method in the previous step, based on the unit cell, weave and interpenetrate along the length direction of the panel, wrap and sew, weave transition on the end section reaching the panel, and then weave along the length of the panel The yarns of the core configuration of the next layer are braided and interspersed in the same direction to prepare a double sandwich symmetrical polygonal pyramid configuration lattice core layer. 2. The double-interlayer symmetrical polygonal pyramid configuration three-dimensional integral braided lattice composite material according to claim 1 is characterized in that: the described upper panel layer, middle panel layer and lower panel layer are three-dimensional multi-directional The integral weaving process technology is prepared by weaving three-dimensional multi-directional integral weaving prefabricated parts with high-performance fiber materials; the high-performance fiber materials refer to carbon fibers, Kevlar fibers, glass fibers, aramid fibers, high-strength polyethylene fibers, One of basalt fibers; the three-dimensional multi-directional integral braided preform refers to a three-dimensional multi-directional integral braid with a specific braiding angle, specific fiber volume content, and specific braiding structure; the range of the braiding angle is 0° Between -50°, the range of the fiber volume content is between 20% and 70%, and the weaving structure refers to one of the three-dimensional four-way, three-dimensional five-way, three-dimensional six-way and three-dimensional seven-way weaving structures kind. 3. The double-interlayer symmetrical polygonal pyramid configuration three-dimensional integral braided lattice composite material according to claim 2, characterized in that: the same high-performance fiber material three-dimensional multi-directional integral braiding is selected for the described upper, middle and lower panel layers fabrics, or choose different high-performance fiber materials three-dimensional multi-directional overall braided fabrics. 4. The double sandwich symmetrical polygonal pyramid configuration three-dimensional integral braided lattice composite material according to claim 1 is characterized in that: there is a completely non-woven structure between the lattice core layer and the upper deck layer, the middle deck layer and the lower deck layer. Separated overall structure; the upper and middle panels, and the middle and lower panels form a double sandwich structure; the lattice core layer is a spatial network truss structure composed of symmetrical polygonal pyramid configuration units with interconnected pores and periodically arranged; the The symmetrical polygonal pyramid configuration refers to one of the configurations of symmetrical triangular pyramids, symmetrical quadrangular pyramids, and symmetrical pentagonal pyramids. 5. The three-dimensional overall braided lattice composite material with double-interlayer symmetrical polygonal pyramid structure according to claim 1, characterized in that: the lattice core layer is made of core yarn (6) in three dimensions according to the design rule The space and the upper, middle and lower panels are woven, interspersed, wound and sewed; the core yarn refers to one of the yarns made of organic fibers, and the organic fibers include carbon fibers, Kevlar fibers, Aramid fiber and glass fiber; the design rule refers to the determination of the symmetrical polygonal pyramid configuration of the lattice core and the spatial orientation angle (7) of the core yarn; the spatial orientation angle refers to the core yarn The angle between the direction in which the wires weave and intersect in space and the vertical axis ranges from 0° to 90°. 6. The double-interlayer symmetrical polygonal pyramid configuration three-dimensional integrally woven lattice composite material according to claim 1, characterized in that: the lattice core has a complete centrosymmetric structure between the upper, middle, middle and lower panel layers , the core yarns are interwoven and wound on the middle panel layer, and the middle panel layer plays an effective supporting role. 7. The three-dimensional overall braided lattice composite material with double-interlayer symmetrical polygonal pyramid configuration according to claim 1, characterized in that: the adjustable range of the height of the lattice core layer is between 0-80mm, and the point The overall height range formed by the array core layer connecting the upper, middle and lower panel layers is between 0-120mm. 8. The double-interlayer symmetrical polygonal pyramid configuration three-dimensional integral braided lattice composite material according to claim 1 is characterized in that: the outer surfaces of the upper, middle and lower panel layers of the composite material are smooth and smooth, and the shape and size are accurate. No secondary processing is required and no damage to the composite material is required. 9. A method for preparing a double sandwich symmetrical polygonal pyramid configuration three-dimensional integral braided lattice composite material as claimed in claim 1, characterized in that it is prepared according to the following steps: (1) Preparation of upper, middle and lower panels The upper, middle and lower panel layers adopt the four-step method of three-dimensional multi-directional integral weaving technology, and are prepared by weaving three-dimensional multi-directional integral weaving prefabricated parts from high-performance fiber materials; the high-performance fiber materials are carbon fiber, Kevlar fiber, One of glass fiber, aramid fiber, high-strength polyethylene fiber, and basalt fiber; the three-dimensional multi-directional integral weaving preform refers to a three-dimensional multi-directional integral weaving with a specific weaving angle, a specific fiber volume content, and a specific weaving structure thing; (2) The step of drilling the pinhole; (3) The manufacturing steps of the lattice core layer; (4) Resin curing molding After the weaving and interweaving of the core yarn is completed, the prefabricated parts are collapsed and stretched; the yarn tension caused by the weaving and interweaving process is overcome; The material preform adopts the resin transfer process and injects resin so that the upper, middle and lower panel layers and lattice core layers are fully impregnated with resin, placed in an oven, and compositely cured and formed; the resin is made of epoxy resin, phenolic One of resin, unsaturated resin, vinyl resin.

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