Honeycomb core structure

Abstract

The utility model provides a honeycomb core structure which comprises a plurality of hollow cylinders which are sequentially arranged, each hollow cylinder is formed by two symmetrically arranged double-arc tooth-shaped walls in a surrounding mode, the section of each hollow cylinder is hexagonal, each double-arc tooth-shaped wall comprises three tooth-shaped walls which are sequentially connected, and each tooth-shaped wall is provided with an opening. The adjacent tooth-shaped walls are connected through arcs; the honeycomb core structure is made of a composite material, and the composite material comprises a bio-based polyamide resin matrix and continuous fibers. The honeycomb core structure with excellent structural strength can be obtained, and the mechanical property of the honeycomb core structure is improved. Meanwhile, by adopting the composite material which is relatively high in strength and rigidity and possibly relatively low in weight, the planning of sustainable development is facilitated, the dependence on non-renewable resources is reduced, the design requirements of energy conservation, emission reduction and light weight in different fields can be met, and the composite material can be widely applied to occasions with high strength and light weight.

Description

Technical Field

[0001] The utility model relates to the technical field of composite materials, in particular to a honeycomb core structure. Background Art

[0002] Honeycomb panels are panels with a geometric shape similar to a honeycomb structure. Plastic honeycomb panels have the characteristics of light weight, high strength, heat insulation, and sound insulation. They can replace traditional metal plates, cardboard, wood boards, etc., and are used in building formwork, trucks, refrigerated trucks and logistics vehicle compartments, mobile cabins, yachts, partitions and other fields. They are widely used. Traditional plastic honeycomb composite panels are honeycomb structural materials made of polypropylene fiber composite yarn fabric or prepreg tape on the upper and lower surfaces and polypropylene raw materials as the core material. They are composited by heating. The problem is that the strength of the honeycomb core structure is limited, and it is difficult to meet the use requirements in applications with high mechanical properties. Moreover, with the promotion of carbon neutrality and carbon peak, it is necessary to explore honeycomb core composite materials that are more conducive to sustainable development planning and meet the energy conservation, emission reduction and lightweight design needs in different fields. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a honeycomb core structure in order to overcome the defect of limited strength of the honeycomb core structure in the prior art.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A honeycomb core structure, comprising a plurality of hollow cylinders arranged in sequence,

[0006] The hollow cylinder is surrounded by two symmetrically arranged double-arc toothed walls, so that the cross-section of the hollow cylinder is a hexagon, each of the double-arc toothed walls includes three toothed walls connected in sequence, and adjacent toothed walls are connected by arcs;

[0007] The honeycomb core structure is made of a composite material including a bio-based polyamide resin matrix and continuous fibers.

[0008] In the present technical solution, by adopting this structural form of double arc toothed walls to form a hollow cylinder, and combining it with the composite material described above, a honeycomb core structure with excellent structural strength can be obtained, thereby improving the mechanical properties of the honeycomb core structure. Specifically, the cross-sectional shape of the honeycomb core is hexagonal, and combined with the structural form of the double arc toothed walls, the uniformity and stability of the hexagonal structure can provide the honeycomb core with better anti-bending and anti-extrusion performance, and the structural form of the double arc toothed walls provides better support and dispersion force, and the two can enhance the overall compression resistance of the honeycomb core structure.

[0009] At the same time, the use of this composite material with high strength and stiffness, and possibly low weight, is not only conducive to sustainable development planning and reduces dependence on non-renewable resources, but can also meet the design requirements of energy conservation, emission reduction and lightweight in different fields, and can be widely used in high-strength and lightweight occasions.

[0010] Preferably, the double arc toothed wall contains at least one layer of unidirectional prepreg tape and / or at least one layer of fiber cloth, and the fiber cloth is preferably glass fiber cloth.

[0011] In this technical solution, the double arc toothed wall adopts this structural form, which can make full use of different types of fiber-reinforced materials to obtain the required mechanical properties. Specifically, the inner layer of unidirectional prepreg tape can provide unidirectional strength, while the middle layer of fiber cloth can provide multi-directional strength and stability, and the outer layer of unidirectional prepreg tape can further increase its own strength. This composite structure is designed to achieve a high-performance, high-strength honeycomb core structure that can be widely used in a variety of applications.

[0012] Preferably, the double arc toothed wall comprises an inner layer, a middle layer and an outer layer, the inner layer and the outer layer respectively contain at least one layer of unidirectional prepreg tape, and the middle layer contains at least one layer of fiber cloth.

[0013] In this technical solution, the double arc toothed wall adopts this structural form, which can make full use of different types of fiber reinforcement materials to obtain the required mechanical properties. Specifically, the unidirectional prepreg tapes of the inner and outer layers provide unidirectional strength, while the fiber cloth of the middle layer can increase the strength and stability in multiple directions. This combined structure can be used in applications that require specific strength and stiffness directions, and can provide better performance in multiple directions. This composite structure is designed to achieve a high-performance, high-strength honeycomb core structure that can be widely used in a variety of applications.

[0014] Preferably, when the unidirectional prepreg tape is provided with two or more layers, the angle between the continuous fibers in two adjacent layers of the unidirectional prepreg tape is in the range of 0-90°.

[0015] In the present technical solution, this structural form can increase the multi-directional strength of the honeycomb core structure, so that it has good mechanical properties in all directions. In addition, the angle design of the continuous fibers also helps to improve the bending performance of the honeycomb core structure, that is, the fiber arrangement in different directions can make the honeycomb core structure better resist bending stress and increase its rigidity. At the same time, this angle range design can also improve the stability of the honeycomb core structure, reduce its own deformation and deflection, and keep the honeycomb core structure stable under load.

[0016] Preferably, the angle between the extension direction of the continuous fibers in the double-arc toothed wall and the height direction of the hollow cylinder is α, and 0°≤α≤90°.

[0017] In the present technical solution, when α is zero degrees, the extension direction of the continuous fibers in the double arc toothed wall is parallel to the height direction of the hollow cylinder; when α is 90 degrees, the extension direction of the continuous fibers in the double arc toothed wall is perpendicular to the height direction of the hollow cylinder. Therefore, by adopting this structural form, the performance of the honeycomb core structure in multiple directions is increased, and strength and rigidity can be provided in vertical, horizontal and oblique directions. Moreover, by specifically setting the angle of α, not only can the bending properties of the material be optimized to adapt to different applications and meet the bending resistance in different directions, but also the distribution of stress on the honeycomb core structure can be better controlled, thereby improving the performance and stability of the honeycomb core structure.

[0018] Preferably, the thickness of the unidirectional prepreg tape ranges from 0.15 mm to 0.5 mm;

[0019] And / or, the thickness of the double arc toothed wall is in the range of 0.15-2.0 mm.

[0020] In this technical solution, the use of this structural form of unidirectional prepreg tape and / or double arc toothed wall can reduce the overall weight of the honeycomb core structure on the basis of meeting the mechanical properties. Specifically, the lightweight design and performance optimization of the material can be achieved according to specific needs and applications.

[0021] Preferably, the arc diameters between adjacent toothed walls are equal;

[0022] The diameter of the arc ranges from 0.5 mm to 3.0 mm;

[0023] And / or, the toothed wall lengths of each of the double-arc toothed walls are equal;

[0024] The length of the toothed wall ranges from 5 mm to 20 mm.

[0025] In the present technical solution, the equal arc diameters of adjacent toothed walls and / or the equal lengths of the toothed walls can provide uniformity and consistency of the material, and the uniform design helps to improve the stability of the honeycomb core structure, so that it maintains consistent performance under load.

[0026] Preferably, the maximum diameter of the cross-sectional dimension of the hollow cylinder is in the range of 0.6 cm to 4.0 cm.

[0027] In this technical solution, the cross-sectional size of this structural form can increase the compactness of the double arc toothed wall in the hollow cylinder, improve the strength of the honeycomb core structure, and help the honeycomb core structure better resist external stress and load. Therefore, the distance range of the cross-sectional size of the hollow cylinder can be adjusted according to one's own needs to achieve better structural strength, rigidity control and performance optimization.

[0028] Preferably, the cross-sectional size of each hollow cylinder is 0.5 cm 2 -10cm 2 within the range.

[0029] In this technical solution, this structural form can increase the compactness of the double arc toothed wall in the hollow cylinder, improve the strength of the honeycomb core structure, and help the honeycomb core structure better resist external stress and load. Therefore, the cross-sectional size of the hollow cylinder can be adjusted according to one's own needs to achieve better structural strength, rigidity control and performance optimization.

[0030] Preferably, the volume of the continuous fibers accounts for 30%-75% of the volume of the composite material.

[0031] In the technical solution, by adopting this structural form, a higher volume ratio of continuous fibers will improve the strength and stiffness of the composite material. Moreover, a high volume ratio of continuous fibers can not only improve the wear resistance of the composite material, making it more suitable for environments and applications that need to withstand wear, but also improve the corrosion resistance of the composite material, making it more suitable for use in corrosive environments.

[0032] Preferably, an adhesive layer connected to the adjacent hollow cylinder is also provided on the outer surface of the double arc toothed wall away from the central axis of the hollow cylinder;

[0033] The material of the bonding layer is selected from resins with a melting point in the range of 60-220°C.

[0034] In the present technical solution, the bonding layer can connect the double arc toothed wall with the adjacent hollow cylinder, and the selection of a resin material with an appropriate melting point range can ensure that the bonding layer maintains its bonding performance within the expected temperature range, thereby providing the strength of the structural connection. In addition, the selection of a suitable resin material can ensure that it is compatible with other materials, not only connected to the double arc toothed wall and the hollow cylinder, but also coordinated with the materials in the double arc toothed wall in composition. At the same time, the selection of the material melting point range of the bonding layer can also affect the bonding quality. The selection of an appropriate resin material within the melting point range can ensure sufficient bonding performance and avoid peeling or loosening at different temperatures. In addition, the selection of an appropriate resin material can improve the feasibility of maintenance and repair.

[0035] Preferably, the apparent density of the honeycomb core structure is 65Kg / m3 -200 Kg / m 3 within the range.

[0036] In the present technical solution, the apparent density is limited to the above range, so that the honeycomb core structure can be relatively light, and the density within this range can find a balance between strength and stiffness.

[0037] The positive and progressive effect of the utility model is that by adopting this structural form of double arc toothed walls to form a hollow cylinder, and combining it with the above-mentioned composite material, a honeycomb core structure with excellent structural strength can be obtained, and the mechanical properties of the honeycomb core structure are improved. Specifically, the cross-sectional shape of the honeycomb core is hexagonal, and combined with the structural form of the double arc toothed walls, the uniformity and stability of the hexagonal structure can provide the honeycomb core with better anti-bending and anti-extrusion performance, and the structural form of the double arc toothed walls provides better support and dispersion force, and the two can enhance the overall compression resistance of the honeycomb core structure.

[0038] At the same time, the use of this composite material with high strength and stiffness, and possibly low weight, is not only conducive to sustainable development planning and reduces dependence on non-renewable resources, but can also meet the design requirements of energy conservation, emission reduction and lightweight in different fields, and can be widely used in high-strength and lightweight occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of the honeycomb core structure of a preferred embodiment of the utility model.

[0040] Figure 2 It is a top view of the honeycomb core structure of a preferred embodiment of the utility model.

[0041] Figure 3 It is a cross-sectional schematic diagram of a hollow cylinder according to a preferred embodiment of the utility model.

[0042] Figure 4 This is a schematic structural diagram of a double arc toothed wall of a preferred embodiment of the utility model.

[0043] Figure 5 Two structural schematic diagrams of the hollow cylinder of the preferred embodiment of the utility model are shown.

[0044] Description of reference numerals:

[0045] Honeycomb core structure 100

[0046] Hollow cylinder 200

[0047] Double arc toothed wall 21

[0048] Toothed wall 211

[0049] Arc 212

[0050] Inner layer 22

[0051] Middle layer 23

[0052] Outer layer 24

[0053] Adhesive layer 25

[0054] The height direction Y of the hollow cylinder DETAILED DESCRIPTION

[0055] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0056] like Figure 1-Figure 5 As shown, the present application discloses a honeycomb core structure 100 .

[0057] like Figure 1 As shown, the honeycomb core structure 100 includes a plurality of hollow cylinders 200 arranged in sequence, wherein the hollow cylinder 200 is surrounded by two symmetrically arranged double arc toothed walls 21, so that the cross section of the hollow cylinder 200 is a hexagon. Figure 2-Figure 3 As shown. Figure 4 As shown, each double-arc toothed wall 21 includes three toothed walls 211 connected in sequence, and adjacent toothed walls 211 are connected via arcs 212 .

[0058] Furthermore, the honeycomb core structure 100 is made of a composite material, specifically, a continuous fiber reinforced bio-based polyamide composite material, wherein the composite material includes a bio-based polyamide resin matrix and continuous fibers.

[0059] In this embodiment, by adopting the double arc toothed wall 21 of this structural form to form a hollow cylinder 200, and combining the above-mentioned composite material, a honeycomb core structure 100 with excellent structural strength can be obtained, and the mechanical properties of the honeycomb core structure 100 are improved. Specifically, the cross-sectional shape of the honeycomb core is hexagonal, and combined with the structural form of the double arc toothed wall 21, the uniformity and stability of the hexagonal structure can provide the honeycomb core with better anti-bending and anti-extrusion performance, and the structural form of the double arc toothed wall 21 provides better support and dispersion force, and the two can enhance the compression resistance of the honeycomb core structure 100 as a whole.

[0060] At the same time, the use of this composite material with high strength and stiffness, and possibly low weight, is not only conducive to sustainable development planning and reduces dependence on non-renewable resources, but can also meet the design requirements of energy conservation, emission reduction and lightweight in different fields, and can be widely used in high-strength and lightweight occasions.

[0061] Compared with the honeycomb core structure 100 in the prior art using traditional thermoplastic resins, such as polypropylene, the use of bio-based polyamide in this embodiment also has the following advantages:

[0062] First, bio-based polymers are usually made from renewable materials, such as plant starch, cellulose or biomass, which are relatively abundant and can be regenerated in a short time. Therefore, bio-based polymers help reduce dependence on non-renewable resources such as limited petroleum, and help reduce the burden on the environment.

[0063] Secondly, bio-based polymers generally emit less greenhouse gases during production because they come from renewable resources. This can reduce the overall carbon footprint of a product relative to using synthetic polymers.

[0064] like Figure 4 As shown, in this embodiment, the three toothed walls 211 are arranged parallel to each other, and the diameter R1 of the arc 212AB segment is equal to the diameter R4 of the arc 212A'B', preferably in the range of 0.5mm-3.0mm; the diameter R2 of the arc 212CD segment is equal to the diameter R2 of the arc 212C'D', preferably also in the range of 0.5mm-3.0mm. At the same time, in this embodiment, it is preferred that the lengths of the toothed walls BC, DD' and C'B' are equal, and the length range is limited to between 5mm-20mm, preferably between 5mm-10mm. Therefore, in this embodiment, the cross-sectional shape of the hollow cylinder 200 is preferably a regular hexagonal chamfer, and the equal arc diameters of adjacent toothed walls and the equal lengths of the toothed walls can provide uniformity and consistency of the material, and the uniform design helps to improve the stability of the honeycomb core structure, so that it maintains consistent performance under load.

[0065] In other embodiments, the cross-sectional shape of the hollow cylinder can be set as needed, and can also be set to a hexagonal structure with unequal toothed wall lengths, non-parallel toothed walls 211, and unequal arc diameters, or only the arc diameters between adjacent toothed walls can be equal, and the arc diameter range is limited to 0.5mm-3.0mm, or only the toothed wall lengths of each double-arc toothed wall can be equal, and the length range of the toothed wall is limited to 5mm-20mm. As long as the strength requirements of the honeycomb core structure 100 can be met, they are all within the protection scope of the present application.

[0066] Furthermore, in the present embodiment, the composite material is preferably a tape-shaped prepreg, which may be made by impregnating mutually parallel continuous fibers with a bio-based polyamide resin.

[0067] Specifically, in this embodiment, the method for preparing the honeycomb core includes at least the following steps:

[0068] S1. hot pressing a pre-prepared bio-based polyamide continuous fiber composite material into a corrugated sheet;

[0069] S2. Splicing and bonding the corrugated sheets to form a plurality of hollow cylinders 200 arranged in rows, thereby obtaining the desired honeycomb core structure 100.

[0070] Preferably, the double-arc toothed wall contains at least one layer of unidirectional prepreg tape and / or at least one layer of fiber cloth, or the double-arc toothed wall includes an inner layer, a middle layer and an outer layer, the inner layer and the outer layer each contain at least one layer of unidirectional prepreg tape, and the middle layer contains at least one layer of fiber cloth.

[0071] In this embodiment, the structure of the double arc toothed wall 21 includes at least the following forms:

[0072] First, as Figure 5 As shown, the double arc toothed wall 21 only includes two layers, namely, an inner layer 22 and an outer layer 24, wherein the inner layer 22 and the outer layer 24 each contain a layer of unidirectional prepreg tape.

[0073] Second, if Figure 5 As shown, the double arc toothed wall 21 includes three layers, namely, an inner layer 22, a middle layer 23 and an outer layer 24, wherein the inner layer 22 and the outer layer 24 each contain at least one layer of unidirectional prepreg tape, and the middle layer 23 contains at least one layer of fiber cloth.

[0074] In this embodiment, the double arc toothed wall 21 adopts this structural form, which can make full use of different types of fiber-reinforced materials to obtain the required mechanical properties. Specifically, the unidirectional prepreg tape of the inner layer 22 can provide unidirectional strength, while the fiber cloth of the middle layer 23 can provide multi-directional strength and stability, and the unidirectional prepreg tape of the outer layer 24 can further increase its own strength. The design of this composite structure is intended to achieve a high-performance, high-strength honeycomb core structure 100, which can be widely used in a variety of application fields.

[0075] Third, if Figure 5 As shown, the double arc toothed wall 21 includes three layers, namely, an inner layer 22, a middle layer 23 and an outer layer 24, wherein the inner layer 22 and the outer layer 24 each contain a layer of unidirectional prepreg tape, and the middle layer 23 contains a layer of glass fiber cloth.

[0076] In this embodiment, the double arc toothed wall 21 adopts this structural form, and can also make full use of different types of fiber-reinforced materials to obtain the required mechanical properties. Specifically, the unidirectional prepreg tapes of the inner layer 22 and the outer layer 24 provide unidirectional strength, while the glass fiber cloth of the middle layer 23 can increase the strength and stability in multiple directions. This combined structure can be used in applications that require specific strength and stiffness directions, and can provide better performance in multiple directions.

[0077] The fiber cloth in this embodiment is preferably glass fiber cloth, such as plain weave glass fiber cloth or twill weave glass fiber cloth. The thickness of the fiber cloth is between 0.1 mm and 0.4 mm, preferably 0.175 mm and 0.193 mm, such as three right twill glass fiber cloth with a thickness of 0.175 mm and twill glass fiber cloth with a thickness of 0.185 mm.

[0078] Furthermore, in this embodiment, when the unidirectional prepreg tape is provided with two or more layers, the angle between the continuous fibers in two adjacent layers of the unidirectional prepreg tape is in the range of 0-90°, preferably 90° or 45°.

[0079] In this embodiment, by adopting this structural form, the multi-directional strength of the honeycomb core structure 100 can be increased, so that it has good mechanical properties in all directions. In addition, the angle design of the continuous fibers also helps to improve the bending performance of the honeycomb core structure 100, that is, the fiber arrangement in different directions can make the honeycomb core structure 100 better resist bending stress and increase its rigidity. At the same time, this angle range design can also improve the stability of the honeycomb core structure 100, reduce its own deformation and deflection, and keep the honeycomb core structure 100 stable under load.

[0080] Specifically, Figure 5 As shown, the angle between the extension direction of the continuous fibers in the double-arc toothed wall 21 and the height direction Y of the hollow cylinder is α, and 0°≤α≤90°. Specifically, when α is zero degrees, the extension direction of the continuous fibers in the double-arc toothed wall 21 is parallel to the height direction of the hollow cylinder 200; when α is 90 degrees, the extension direction of the continuous fibers in the double-arc toothed wall 21 is perpendicular to the height direction of the hollow cylinder 200.

[0081] like Figure 5 As shown, the extending direction of the continuous fibers in the inner layer 22 is parallel to the height direction Y of the hollow cylinder, and the extending direction of the continuous fibers in the outer layer 24 is perpendicular to the height direction Y of the hollow cylinder.

[0082] Therefore, by limiting the angle α, the performance of the honeycomb core structure 100 in multiple directions is increased, and strength and rigidity can be provided in vertical, horizontal and oblique directions. In addition, by specifically setting the angle α, not only can the bending performance of the material be optimized to adapt to different applications and meet the bending resistance in different directions, but also the distribution of stress on the honeycomb core structure 100 can be better controlled, thereby improving the performance and stability of the honeycomb core structure 100.

[0083] In this embodiment, α is preferably 45° or 90°, and the angle α is more conducive to obtaining higher mechanical properties at different angles of the honeycomb core structure 100 .

[0084] Meanwhile, in the present embodiment, the thickness of the unidirectional prepreg tape ranges from 0.15 mm to 0.5 mm, and a specific preferred range is from 0.2 mm to 0.35 mm, such as 0.25 mm, 0.31 mm, 0.32 mm, and 0.33 mm.

[0085] The thickness of the double arc toothed wall 21 is in the range of 0.15-2.0 mm.

[0086] In this embodiment, the use of such a structural form of unidirectional prepreg tape and / or double arc toothed wall 21 can reduce the overall weight of the honeycomb core structure 100 while satisfying the mechanical properties. Specifically, the lightweight design and performance optimization of the material can be achieved according to specific needs and applications.

[0087] Preferably, the maximum diameter of the cross-sectional dimension of the hollow cylinder 200 is in the range of 0.6 cm to 4.0 cm, preferably in the range of 0.8 to 1.8 cm. The maximum diameter of the cross-sectional dimension of the hollow cylinder 200 refers to the distance between the two points on the edge of the cross section that are farthest apart, for example Figure 4 The distance between AB and A'B'.

[0088] In this embodiment, the cross-sectional dimensions of this structural form can increase the compactness of the double arc toothed wall 21 in the hollow cylinder 200, improve the strength of the honeycomb core structure 100, and help the honeycomb core structure 100 better resist external stress and load. Therefore, the distance range of the cross-sectional dimensions of the hollow cylinder 200 can be adjusted according to one's own needs to achieve better structural strength, rigidity control, and performance optimization.

[0089] Preferably, the cross-sectional size of each hollow cylinder 200 is 0.5 cm 2 -10cm 2 Within the range, preferably 1cm 2 -5cm 2 .

[0090] In this embodiment, this structural form can increase the compactness of the double arc toothed wall 21 in the hollow cylinder 200, improve the strength of the honeycomb core structure 100, and help the honeycomb core structure 100 better resist external stress and load. Therefore, the cross-sectional size of the hollow cylinder 200 can be adjusted according to one's own needs to achieve better structural strength, rigidity control and performance optimization.

[0091] Preferably, the composite material comprises a bio-based polyamide continuous glass fiber unidirectional prepreg tape, a bio-based polyamide continuous aramid fiber unidirectional prepreg tape, a bio-based polyamide continuous basalt fiber unidirectional prepreg tape, a bio-based polyamide continuous polyolefin fiber unidirectional prepreg tape or a bio-based polyamide continuous carbon fiber unidirectional prepreg tape or a combination thereof. According to the embodiment of the present application, the bio-based polyamide in the composite material is selected from bio-based polyamide PA56, bio-based polyamide PA510, bio-based polyamide PA511, bio-based polyamide PA512, bio-based polyamide PA513, bio-based polyamide PA514, bio-based polyamide PA515 and bio-based polyamide PA516, bio-based polyamide PA56 / 5T, bio-based polyamide PA510 / 5T, bio-based polyamide PA511 / 5T, bio-based polyamide PA512 / 5T, bio-based polyamide PA513 / 5T, bio-based polyamide PA514 / 5T, bio-based polyamide PA515 / 5T, bio-based polyamide PA516 / 5T, bio-based polyamide PA56 / 5I, commercially available

[0092]

[0093] Any one or a combination of the following.

[0094] Preferably, in this embodiment, the volume of the continuous fibers accounts for 30%-75%, and further 30-55% of the volume of the composite material, and the density of the composite material is in the range of 1.5 g / cm 3 -2.0g / cm 3 In this structural form, a higher volume ratio of continuous fibers will increase the strength and stiffness of the composite material. In addition, a high volume ratio of continuous fibers can not only improve the wear resistance of the composite material, making it more suitable for environments and applications that need to withstand wear, but also improve the corrosion resistance of the composite material to meet the requirements of use in corrosive environments.

[0095] Preferably, if Figure 5 As shown, an adhesive layer 25 connected to the adjacent hollow cylinder 200 is provided on the outer surface of the double arc toothed wall 21 away from the central axis of the hollow cylinder 200, and the material of the adhesive layer 25 is selected from resins with a melting point in the range of 60-220°C.

[0096] In this embodiment, the bonding layer 25 can connect the double arc toothed wall 21 with the adjacent hollow cylinder 200, and the selection of a resin material with an appropriate melting point range can ensure that the bonding layer 25 maintains its bonding performance within the expected temperature range, thereby providing the strength of the structural connection. In addition, the selection of a suitable resin material can ensure that it is compatible with other materials, not only connected to the double arc toothed wall 21 and the hollow cylinder 200, but also coordinated with the materials in the double arc toothed wall 21 in the composition. At the same time, the selection of the material melting point range of the bonding layer 25 can also affect the bonding quality. Selecting an appropriate resin material within the melting point range can ensure sufficient bonding performance and avoid peeling or loosening at different temperatures. In addition, the selection of an appropriate resin material can improve the feasibility of maintenance and repair.

[0097] Specifically, in this embodiment, only the outer sides of the two double arc toothed walls 21 facing each other are provided with the bonding layer 25. Figure 5 shown.

[0098] The material of the adhesive layer 25 is selected from PE-g-MAH, PP-g-MAH, POE-g-MAH, EPDM-g-MAH, ABS-g-MAH, PS-g-MAH, EVA resin, polyurethane, epoxy resin or acrylic resin, and is preferably an adhesive that cures at room temperature.

[0099] According to the above, the specific data of the honeycomb core structure 100 in this embodiment are: the material is bio-based polyamide continuous glass fiber unidirectional prepreg tape, the density is 1.55g / cm 3 , thickness is 0.32mm, and the content of continuous glass fiber is 30vol%.

[0100] Therefore, after the honeycomb core structure 100 of the above structural form is manufactured, the corresponding mechanical property test is carried out on it, and the test results are shown in the following Table 1:

[0101] Table 1

[0102]

[0103] The method for testing the mechanical properties in this embodiment may refer to GB / T1453-2022 sandwich structure or core flat compression performance test method, that is, performing a compression performance test on the honeycomb core.

[0104] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A honeycomb core structure, comprising a plurality of hollow cylinders arranged in sequence, characterized in that: The hollow cylinder is surrounded by two symmetrically arranged double-arc toothed walls, so that the cross-section of the hollow cylinder is hexagonal, and each of the double-arc toothed walls includes three toothed walls connected in sequence, and adjacent toothed walls are connected by arcs.

2. The honeycomb core structure according to claim 1, characterized in that: The double arc toothed wall contains at least one layer of unidirectional prepreg tape and / or at least one layer of fiber cloth.

3. The honeycomb core structure according to claim 1, characterized in that: The double arc toothed wall comprises an inner layer, a middle layer and an outer layer. The inner layer and the outer layer respectively contain at least one layer of unidirectional prepreg tape, and the middle layer contains at least one layer of fiber cloth.

4. The honeycomb core structure according to claim 2 or 3, characterized in that: When the unidirectional prepreg tape is provided with two or more layers, the angle between the continuous fibers in two adjacent layers of the unidirectional prepreg tape is in the range of 0-90°.

5. The honeycomb core structure according to claim 1, characterized in that: The included angle between the extension direction of the continuous fibers in the double arc toothed wall and the height direction of the hollow cylinder is α, and 0°≤α≤90°.

6. The honeycomb core structure according to claim 2 or 3, characterized in that: The thickness of the unidirectional prepreg tape ranges from 0.15 mm to 0.5 mm; And / or, the thickness of the double arc toothed wall is in the range of 0.15-2.0 mm.

7. The honeycomb core structure according to claim 1, characterized in that: The arc diameters between adjacent toothed walls are equal; The diameter of the arc ranges from 0.5 mm to 3.0 mm; And / or, the toothed wall lengths of each of the double-arc toothed walls are equal; The length of the toothed wall ranges from 5 mm to 20 mm.

8. The honeycomb core structure according to claim 1, characterized in that: The maximum diameter of the cross-sectional dimension of the hollow cylinder ranges from 0.6 cm to 4.0 cm.

9. The honeycomb core structure according to claim 1, characterized in that: The cross-sectional size of each hollow cylinder is 0.5 cm 2 -10cm 2 within the range.

10. The honeycomb core structure according to claim 1, characterized in that: An adhesive layer connected to the adjacent hollow cylinder is also provided on the outer surface of the double arc toothed wall away from the central axis of the hollow cylinder; The material of the bonding layer is selected from resins with a melting point in the range of 60-220°C.

11. The honeycomb core structure according to claim 1, characterized in that: The apparent density of the honeycomb core structure is 65Kg / m 3 -200 Kg / m 3 within the range.

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