Bionic honeycomb-like structure sandwich panel with impact resistance and preparation method thereof

Abstract

The invention belongs to the field of bionic composite material structure engineering, and discloses a bionic honeycomb-like structure sandwich panel with impact resistance and a preparation method thereof, and the bionic honeycomb-like structure sandwich panel with impact resistance comprises an upper skin, a middle honeycomb-like structure interlayer and a lower skin which are sequentially arranged from top to bottom; the interlayer of the middle honeycomb-like structure is composed of a plurality of honeycomb units in the shape of imitated chrysanthemum stone suture lines. The sandwich layer of a honeycomb-like structure is arranged according to the shape characteristics of the bionic chrysanthemum stone suture line, the honeycomb wall of each honeycomb unit in the shape of the bionic chrysanthemum stone suture line is in a secondary wave shape, the overall strength of the sandwich board can be effectively improved, and effective absorption of energy and damage tolerance are achieved; the hollow characteristic of the honeycomb-like structure can reduce the dead weight of the sandwich panel, the sandwich panel is endowed with the characteristic of light weight, and the sandwich panel has a good development prospect in the field of impact resistance protection.

Description

Technical Field

[0001] The present invention belongs to the field of energy absorption and protection, and specifically relates to a bionic honeycomb structure sandwich panel with impact resistance and a preparation method thereof. Background Art

[0002] Sandwich structure composite materials are widely used in rail transportation, automobiles, aerospace and other fields due to their high specific stiffness, high specific strength and excellent energy absorption capacity, especially in the aerospace field that pursues light weight and high strength and the automotive field that pursues energy absorption and low-speed impact resistance. Sandwich structure composite materials can absorb enough impact energy after being impacted to prevent serious damage, and their outstanding impact resistance has attracted the attention of scholars in the field of material safety protection.

[0003] Although sandwich structure composite materials have obvious advantages in many aspects, there are still some performance conflicts and deficiencies. Especially under strong impact loads, lightweight honeycomb structures are difficult to withstand large impact energy and are prone to crushing, causing serious damage to the material. How to use structural design to make sandwich structure composite materials on the basis of overall lightweight, absorb more impact energy and convert it into plastic deformation energy of the material, improve energy absorption capacity, and thus achieve the unity of light weight and high impact resistance is a difficult problem that researchers urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a bionic honeycomb structure sandwich panel with impact resistance and a preparation method thereof, so as to solve the problems raised in the above background technology. The present invention is bionic ammonite suture line shaped, and by setting a honeycomb unit with a secondary wavy honeycomb wall that imitates the ammonite suture line shape, an intermediate honeycomb structure sandwich is formed, so as to avoid the traditional honeycomb structure from being crushed when subjected to a strong impact and being difficult to achieve more energy absorption.

[0005] The technical solution of the present invention is as follows:

[0006] The first aspect of the present invention provides a bionic honeycomb structure sandwich panel with impact resistance, comprising:

[0007] An upper skin, an intermediate honeycomb-like structured interlayer, and a lower skin are sequentially arranged from top to bottom; the intermediate honeycomb-like structured interlayer comprises: a plurality of honeycomb units in the shape of ammonite sutures;

[0008] The cross section of the honeycomb unit in the shape of an ammonite suture line is polygonal, and each side of the polygon includes: a plurality of first-order waves connected in sequence, and a single wave structure of the first-order waves includes: a plurality of second-order waves connected in sequence.

[0009] The bionic honeycomb structure sandwich panel with impact resistance, wherein the height difference between the crest and trough of the secondary wave is smaller than the height difference between the crest and trough of the primary wave.

[0010] The bionic honeycomb structure sandwich panel with impact resistance, wherein the polygon is a regular hexagon;

[0011] Two adjacent honeycomb units in the shape of ammonite suture lines share the same side.

[0012] The bionic honeycomb structure sandwich panel with impact resistance, wherein the thickness of the upper skin and the lower skin are equal, the upper skin and the lower skin are both made of fiber-reinforced composite materials, the fiber arrangement can be selected in a single arrangement mode or a combined arrangement mode, and the fiber arrangement mode of the upper skin and the fiber arrangement mode of the lower skin are symmetrical based on the interlayer of the intermediate honeycomb structure.

[0013] The bionic honeycomb structure sandwich panel with impact resistance, wherein the fiber reinforced composite material is a chopped fiber reinforced composite material or a continuous fiber reinforced composite material, the chopped fibers in the chopped fiber reinforced composite material are one or more of carbon fibers, aramid fibers, carbon nanotubes, and cellulose nanofibers, the continuous fibers in the continuous fiber reinforced composite material are one or more of unidirectional fibers, 2D woven fiber cloth, and 3D woven cloth, and the continuous fibers in the continuous fiber reinforced composite material are one or more of carbon fibers, glass fibers, aramid fibers, high-strength and high-modulus polyethylene fibers, and basalt fibers.

[0014] The bionic honeycomb structure sandwich panel with impact resistance, wherein the material of the intermediate honeycomb structure interlayer includes one or more of organic polymers and metal materials, and the intermediate honeycomb structure interlayer is prepared by 3D printing process or injection molding process.

[0015] The bionic honeycomb structure sandwich panel with impact resistance, wherein the honeycomb unit in the shape of the ammonite suture line is hollow inside or filled with fillers.

[0016] A second aspect of an embodiment of the present invention provides a method for preparing a bionic honeycomb structure sandwich panel with impact resistance, comprising:

[0017] Provide upper and lower skins;

[0018] Constructing a model of an intermediate honeycomb-like interlayer structure, and preparing an intermediate honeycomb-like interlayer structure based on the model; or constructing a mold of an intermediate honeycomb-like interlayer structure, and preparing an intermediate honeycomb-like interlayer structure based on the mold;

[0019] The upper skin, the middle honeycomb-like structured interlayer and the lower skin are connected to obtain a bionic honeycomb-like structured sandwich panel with impact resistance.

[0020] The method for preparing the bionic honeycomb structure sandwich panel with impact resistance, wherein the model of the intermediate honeycomb structure sandwich is constructed, and based on the model, the intermediate honeycomb structure sandwich is prepared, comprising:

[0021] A three-dimensional solid model of an intermediate honeycomb structure sandwich is constructed, and based on the three-dimensional solid model of the intermediate honeycomb structure sandwich, the intermediate honeycomb structure sandwich is prepared by a 3D printing process;

[0022] The mold for constructing the sandwich of the intermediate honeycomb structure, based on which the sandwich of the intermediate honeycomb structure is prepared, comprises:

[0023] A mold for an intermediate honeycomb structure sandwich is prepared based on the honeycomb unit in the shape of an ammonite suture line and the size of the intermediate honeycomb structure sandwich. Based on the mold, an injection molding process is used to prepare the intermediate honeycomb structure sandwich.

[0024] The method for preparing the bionic honeycomb structure sandwich panel with impact resistance, wherein the upper skin and the lower skin are both made of fiber-reinforced composite materials, and the upper skin or the lower skin is obtained by the following steps:

[0025] Pre-treating the fibers and dividing them into several treated fibers;

[0026] After spraying the release agent on the substrate surface, coating the first portion of the thermosetting resin mixture and placing the first portion of the treated fiber; continuing to coat the next portion of the thermosetting resin mixture and placing the next portion of the treated fiber, until coating the last portion of the thermosetting resin mixture and placing the last portion of the treated fiber, to obtain a skin precursor;

[0027] After placing a guide cloth and a demoulding cloth on the surface of the skin precursor, the whole is placed in a vacuum bag, the whole material is sealed with a sealant, and a vacuum pump is connected to evacuate the whole material. After the thermosetting resin mixture is completely cured, the mold is released to obtain an upper skin or a lower skin.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention provides a bionic honeycomb structure sandwich panel with impact resistance and a preparation method thereof, a bionic ammonite suture, and a complex multi-level suture that can effectively support the shell, better withstand external water pressure, and enhance its overall structure, thereby obtaining a greater survival advantage. The present invention extracts the multi-level shape elements of the ammonite suture, combines the classic hexagonal structure of the traditional honeycomb structure, designs a honeycomb unit with a secondary wavy honeycomb wall in the shape of an ammonite suture, and obtains a sandwich of a bionic honeycomb structure. Compared with the bending deformation of the traditional hexagonal honeycomb cell wall, each wavy shape of the honeycomb cell wall in the shape of an ammonite suture produces a torsional deformation, which can absorb more impact energy and improve the damage tolerance of the material. In summary, the present invention imitates the multi-level suture of the ammonite, sets an intermediate honeycomb structure sandwich with a secondary wavy honeycomb wall, and combines the skin prepared based on fiber-reinforced composite materials, which can effectively improve the impact resistance and enhance the energy absorption capacity. At the same time, the honeycomb structure has its own lightweight characteristics, and the obtained bionic honeycomb structure sandwich panel has both lightweight, energy absorption and impact resistance, and has important application value in the field of material safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of a bionic honeycomb structure sandwich panel with impact resistance according to the present invention;

[0031] Figure 2 A schematic diagram of the sandwich of the intermediate honeycomb structure;

[0032] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0033] Figure 4 A schematic diagram of a honeycomb unit that mimics the shape of an ammonite suture;

[0034] Figure 5 It is a schematic diagram of the sandwich cross section of the intermediate honeycomb structure;

[0035] Figure 6 Schematic diagram of the cross section of a honeycomb unit that mimics the shape of an ammonite suture.

[0036] Description of reference numerals:

[0037] 1. Upper skin; 2. Intermediate honeycomb structure interlayer; 21. Primary wave; 22. Secondary wave; 3. Lower skin. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be further described in detail below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Sandwich structure composite materials are widely used in various fields due to their excellent specific energy absorption, but it is still difficult to balance light weight and high impact resistance. Learning from nature, many organisms in nature have unique structures that show light weight and excellent energy absorption characteristics, which provides ideas for the design of sandwich structure composite materials. The multi-level suture shape of the bionic ammonite of the present invention is combined with the traditional regular hexagonal honeycomb structure, and the upper and lower skins and the middle honeycomb structure sandwich are prepared by vacuum assisted molding method and 3D printing method to obtain a bionic honeycomb structure sandwich panel with high impact resistance.

[0040] Ammonites, which evolved from nautilus, have survived on Earth for at least 300 million years. One of the most obvious signs of the difference between ammonites and nautilus is the suture line, which has gradually evolved from the early simplicity to the complex and exquisite (the suture line specifically evolved from the nautilus type to the ridgeless ammonite type, then evolved to the ridged ammonite type, then evolved to the toothed ammonite type, and finally evolved to the ammonite type). Through the theoretical calculation of the shell model of ammonites, it can be known that the displacement, stress and deformation of the ammonite shell are significantly reduced with the increase of the complexity of the shell suture line. Ammonites reduce the strain and stress in the diaphragm by sharing the same pressure load along the longer suture line. Its complex and exquisite suture line effectively enhances the structural strength of the shell, allowing ammonites to withstand greater water pressure and prevent the diaphragm from imploding. Compared with ammonites with simple suture lines, ammonites with complex and exquisite suture lines can withstand more drastic acceleration changes during movement and obtain greater survival advantages. The present invention biomimics the complex suture line of ammonites, applies it to a polygonal honeycomb structure, and sets the polygonal honeycomb wall as a secondary wave shape to load a larger load and impact, thereby achieving the unity of light weight and high impact resistance.

[0041] The present invention provides a bionic honeycomb sandwich panel with impact resistance. Figure 1 As shown, it includes: from top to bottom, an upper skin 1, an intermediate honeycomb-like structured interlayer 2, and a lower skin 3. The upper skin 1 and the lower skin 3 provide the sandwich panel with the rigidity of the entire material of the sandwich panel, and enhance the impact resistance. In particular, the upper skin 1 first contacts the impact load, bears the maximum impact force, and transmits the stress to the intermediate honeycomb-like structured interlayer 2. The upper skin 1 and the lower skin 3 are used to enhance the stability of the overall structure. By increasing the thickness of the upper skin 1 and the lower skin 3, the peak force of the impact force is increased, and the impact resistance of the sandwich panel is stronger.

[0042] like Figure 2 As shown, the interlayer 2 of the intermediate honeycomb structure includes: a plurality of honeycomb units in the shape of ammonite sutures, wherein the honeycomb units in the shape of ammonite sutures can be kept hollow or filled with fillers such as PMI foam, etc., and the plurality of honeycomb units in the shape of ammonite sutures can disperse the stress conducted by the upper skin 1 to achieve efficient energy absorption. The honeycomb units in the shape of ammonite sutures are imitating the sutures of ammonites, and a secondary wavy honeycomb wall is provided, such as Figure 3 , Figure 4 as well as Figure 5 The cross section of the honeycomb unit imitating the shape of the ammonite suture line is polygonal, as shown in Figure 6 As shown, each side of the polygon includes: a plurality of first-order waves 21 connected in sequence, and a single wave structure of the first-order wave 21 includes: a plurality of second-order waves 22 connected in sequence. Under compression load, compared with the energy absorbed by the progressive bending of the traditional honeycomb structure, the honeycomb wall with the second-order wave shape has a large number of plastic hinges, has significantly different torsional deformation, can withstand greater stress and deformation, and greatly improves the energy absorption performance.

[0043] The height difference between the crest and trough of the secondary wave 22 is smaller than the height difference between the crest and trough of the primary wave 21. The height difference between the crest and trough refers to the height difference between adjacent crests and troughs. The crest and trough of the primary wave 21 are located on both sides of the side where the primary wave 21 is located, and the crest and trough of the secondary wave 22 are located on both sides of the primary wave 21. The height difference between the crest and trough in the secondary wave 22 is smaller, and the height difference between the crest and trough in the primary wave 21 is larger.

[0044] The polygon is a regular hexagon; two adjacent honeycomb units in the shape of ammonite suture lines share the same side. The polygon can be a regular hexagon, because the regular hexagons can be close to each other to form a plane figure without gaps, and the regular hexagon is close to a circle, which is conducive to forming a higher strength.

[0045] The thickness of the upper skin 1 and the lower skin 3 are equal, and both the upper skin 1 and the lower skin 3 are made of fiber-reinforced composite materials. The fiber arrangement of the upper skin 1 and the fiber arrangement of the lower skin 3 are symmetrical based on the interlayer 2 of the intermediate honeycomb structure.

[0046] Specifically, the upper skin 1 and the lower skin 3 are both fiber-reinforced composite materials, and the thickness of the upper skin 1 and the lower skin 3 is equal, which is conducive to enhancing the stability of the overall structure. The fiber arrangement mode can be selected from a single arrangement mode or a combined arrangement mode. The fiber arrangement mode of the upper skin 1 and the fiber arrangement mode of the lower skin 3 are symmetrical based on the interlayer 2 of the intermediate honeycomb structure. The fiber-reinforced composite material is a short-cut fiber-reinforced composite material or a continuous fiber-reinforced composite material. The short-cut fiber in the short-cut fiber-reinforced composite material is one or more of carbon fiber, aramid fiber, carbon nanotube, and cellulose nanofiber. The continuous fiber of the continuous fiber-reinforced composite material is one or more of unidirectional fiber, 2D woven fiber cloth, and 3D woven cloth. The continuous fiber in the continuous fiber-reinforced composite material is one or more of carbon fiber, glass fiber, aramid fiber, high-strength and high-modulus polyethylene fiber, and basalt fiber. For example, carbon fiber has high tensile and compressive strength and stiffness, and glass fiber has good toughness and better resistance to impact damage. Combining the performance characteristics of the two, carbon fiber and glass fiber are staggered and arranged layer by layer to obtain excellent comprehensive performance.

[0047] Specifically, the material of the interlayer 2 of the intermediate honeycomb structure includes one or more of organic high molecular polymers such as plastics and metal materials such as aluminum alloys. The interlayer of the intermediate honeycomb structure can be prepared by a 3D printing process or an injection molding process.

[0048] The present invention also provides a method for preparing a bionic honeycomb structure sandwich panel with impact resistance, comprising the following steps:

[0049] S1. Provide upper skin and lower skin;

[0050] S2. Constructing a model of an intermediate honeycomb-like interlayer structure, and preparing an intermediate honeycomb-like interlayer structure based on the model; or constructing a mold of an intermediate honeycomb-like interlayer structure, and preparing an intermediate honeycomb-like interlayer structure based on the mold.

[0051] S3, connecting the upper skin, the middle honeycomb structure sandwich and the lower skin to obtain a bionic honeycomb structure sandwich panel with impact resistance.

[0052] Specifically, an upper skin and a lower skin are first prepared, and then based on a model or a mold of an intermediate honeycomb structure sandwich, an intermediate honeycomb structure sandwich is prepared, and then the upper skin, the intermediate honeycomb structure sandwich and the lower skin are connected to obtain a bionic honeycomb structure sandwich panel with impact resistance. The connection of the upper skin, the intermediate honeycomb structure sandwich and the lower skin can be achieved by bonding.

[0053] S2 specifically includes:

[0054] S21. Construct a three-dimensional solid model of the interlayer of the intermediate honeycomb structure. Based on the three-dimensional solid model of the interlayer of the intermediate honeycomb structure, use a 3D printing process to prepare the interlayer of the intermediate honeycomb structure.

[0055] Specifically, a 3D printing method is used to prepare an intermediate honeycomb structure sandwich. First, a three-dimensional solid model of the intermediate honeycomb structure sandwich is established. Then, a 3D printer is used to print the material of the sandwich according to the three-dimensional solid model of the intermediate honeycomb structure sandwich to obtain the intermediate honeycomb structure sandwich. When establishing the three-dimensional solid model of the intermediate honeycomb structure sandwich, a composite wave formed by a composite of a primary wave and a secondary wave is first established. The composite wave is used as the edge of a polygon to establish a honeycomb unit in the shape of an ammonite suture line. A plurality of honeycomb units in the shape of an ammonite suture line are arranged to form a three-dimensional solid model of the intermediate honeycomb structure sandwich.

[0056] S2 specifically includes:

[0057] S22. A mold for preparing an intermediate-type honeycomb structure interlayer based on the honeycomb unit of the shape of the ammonite suture line and the size of the intermediate-type honeycomb structure interlayer is prepared. Based on the mold, an injection molding process is used to prepare the intermediate-type honeycomb structure interlayer.

[0058] Specifically, an injection molding method is used to prepare an intermediate honeycomb structure interlayer. First, a mold for the intermediate honeycomb structure interlayer is prepared, and then injection molding is performed based on the mold. Specifically, the intermediate honeycomb structure interlayer is obtained through the steps of mold closing, filling, pressure holding, cooling, mold opening, and demolding.

[0059] The upper skin and the lower skin are both made of fiber-reinforced composite materials, and the upper skin or the lower skin is obtained by the following steps:

[0060] A1. Pre-treat the fibers and divide them into several portions for treatment.

[0061] A2. After spraying the release agent on the surface of the substrate, apply the first portion of the thermosetting resin mixture and place the first portion of the treated fiber; continue to apply the next portion of the thermosetting resin mixture and place the next portion of the treated fiber, until the last portion of the thermosetting resin mixture is applied and the last portion of the treated fiber is placed to obtain a skin precursor.

[0062] A3. After placing a guide cloth and a demoulding cloth on the surface of the skin precursor, the whole is placed in a vacuum bag, the whole material is sealed with a sealant, and a vacuum pump is connected to evacuate the whole material. After the thermosetting resin mixture is completely cured, the mold is released to obtain an upper skin or a lower skin.

[0063] Specifically, the skin (including the upper skin and the lower skin) adopts a fiber-reinforced composite material, specifically a fiber-reinforced resin material. After providing the fiber and the thermosetting resin mixture, the fiber is first pretreated, and the pretreatment includes: removing colloid and impurities, drying and other treatments. Then, according to a certain arrangement method, the fiber is arranged in the thermosetting resin mixture to obtain a skin precursor. The fiber can be a chopped fiber or a continuous fiber. The chopped fiber is usually evenly dispersed in the thermosetting resin mixture. The continuous fiber can be a unidirectional arrangement (unidirectional fibers are formed in each layer, and the arrangement direction can be changed in different layers to form unidirectional fibers with different arrangement directions), a two-dimensional (2D) woven cloth or a three-dimensional (3D) woven cloth. In order to improve the uniformity of fiber distribution, the fibers are divided into several portions (for example, the number of fibers is N), and the thermosetting resin mixture is also divided into several portions (for example, the number of thermosetting resin mixture is N+1), and the fibers and the thermosetting resin mixture are alternately laid in a layer-by-layer arrangement, so that the fibers are fully in contact with the thermosetting resin mixture and are evenly dispersed. A guide cloth and a demolding cloth are placed on the skin precursor, and the skin precursor, the guide cloth, the demolding cloth and the substrate (which can be a glass plate) are placed together in a vacuum bag, and the vacuum bag is sealed and evacuated to solidify the thermosetting resin mixture, and the skin is obtained after demolding.

[0064] Specific application examples:

[0065] (1) The skin is prepared by vacuum-assisted molding. Several unidirectional carbon fiber cloths and glass fiber cloths of the same size are cut according to a certain size, soaked in an acetone solution for 48 hours, and the surface colloid and impurities are removed. After being taken out, they are dried at 80°C. A release agent is sprayed on the glass surface, and a certain mass of slow-drying E51 resin mixture is coated on its surface. A layer of carbon fiber cloth is placed on the mold surface of the resin mixture, and the same mass of resin mixture is coated on the surface of the first layer of carbon fiber cloth. The second layer of glass fiber cloth is laid perpendicular to the direction of the carbon fiber cloth. The same operation process is performed to prepare a skin precursor with 12 layers of fiber cloth. A guide cloth and a demoulding cloth are placed on the surface of the skin precursor, and the whole is placed in a vacuum bag. The whole material is sealed with a sealant, and a vacuum pump is connected to evacuate for 12 hours. The resin mixture is kept for 12 hours to completely cure, and then demolded to obtain the skin.

[0066] (2) Using 3D printing method to prepare the intermediate honeycomb structure sandwich. Construct a three-dimensional solid model of the intermediate honeycomb structure sandwich in three-dimensional software, import the STL format data into the 3D printer, slice the structure through the software, stack the printed materials layer by layer, and gradually assemble them into a whole.

[0067] (3) The upper and lower skins are combined with the intermediate honeycomb structure sandwich. The intermediate honeycomb structure sandwich is bonded to the upper and lower skins with an adhesive, and cured under a certain pressure and temperature to obtain a bionic honeycomb structure sandwich panel with impact resistance.

[0068] In summary, the present invention provides a bionic honeycomb structure sandwich panel with impact resistance and a preparation method thereof, comprising: upper and lower skins and an intermediate honeycomb structure interlayer. The intermediate honeycomb structure interlayer is composed of a number of honeycomb units in the shape of ammonite sutures, and the honeycomb units in the shape of ammonite sutures have secondary wavy honeycomb walls, which can provide a large number of plastic hinges in different size ranges, produce distortions different from traditional honeycomb structures, and absorb more impact energy; the upper and lower skins provide overall structural stability and impact resistance, and transmit and disperse stress to a number of honeycomb units in the shape of ammonite sutures. The bionic honeycomb structure sandwich panel with impact resistance of the present invention combines the ammonite multi-level sutures and the honeycomb structure, and achieves the purpose of high impact resistance and excellent energy absorption effect on the basis of maintaining the lightweight of the sandwich panel, and has good application prospects in the field of material protection and energy absorption.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that improvements and modifications may be made to the embodiments without departing from the principles and spirit of the present invention, and that all such improvements and modifications shall fall within the scope of protection of the claims appended hereto.

Claims

1. A bionic honeycomb structure sandwich panel with impact resistance, characterized in that: include: An upper skin, a middle honeycomb-like structured interlayer, and a lower skin are sequentially arranged from top to bottom; The interlayer of the intermediate honeycomb structure comprises: a plurality of honeycomb units in the shape of ammonite sutures; The cross section of the honeycomb unit in the shape of an ammonite suture line is polygonal, and each side of the polygon includes: a plurality of first-order waves connected in sequence, and a single wave structure of the first-order waves includes: a plurality of second-order waves connected in sequence.

2. The bionic honeycomb structure sandwich panel with impact resistance according to claim 1, characterized in that: The height difference between the crest and trough of the secondary wave is smaller than the height difference between the crest and trough of the primary wave.

3. The bionic honeycomb structure sandwich panel with impact resistance according to claim 1, characterized in that: The polygon is a regular hexagon; Two adjacent honeycomb units in the shape of ammonite suture lines share the same side.

4. The bionic honeycomb structure sandwich panel with impact resistance according to claim 1, characterized in that: The thickness of the upper skin is equal to that of the lower skin. Both the upper skin and the lower skin are made of fiber-reinforced composite materials. The fiber arrangement of the upper skin and the fiber arrangement of the lower skin are symmetrical based on the interlayer of the intermediate honeycomb-like structure.

5. The bionic honeycomb structure sandwich panel with impact resistance according to claim 4, characterized in that: The fiber-reinforced composite material is a chopped fiber reinforced composite material or a continuous fiber reinforced composite material, the chopped fibers in the chopped fiber reinforced composite material are one or more of carbon fibers, aramid fibers, carbon nanotubes, and cellulose nanofibers, the continuous fibers in the continuous fiber reinforced composite material are one or more of unidirectional fibers, 2D woven fiber cloth, and 3D woven cloth, and the continuous fibers in the continuous fiber reinforced composite material are one or more of carbon fibers, glass fibers, aramid fibers, high-strength and high-modulus polyethylene fibers, and basalt fibers.

6. The bionic honeycomb structure sandwich panel with impact resistance according to claim 1, characterized in that: The material of the interlayer of the intermediate honeycomb structure includes one or more of organic high molecular polymers and metal materials, and the interlayer of the intermediate honeycomb structure is prepared by a 3D printing process or an injection molding process.

7. The bionic honeycomb structure sandwich panel with impact resistance according to claim 1, characterized in that: The honeycomb unit in the shape of the ammonite suture line is hollow or filled with fillers.

8. A method for preparing a bionic honeycomb structure sandwich panel with impact resistance as claimed in any one of claims 1 to 7, characterized in that: include: Provide upper and lower skins; Constructing a model of an intermediate honeycomb-like structured sandwich, and preparing the intermediate honeycomb-like structured sandwich based on the model; or constructing a mold for a sandwich of an intermediate honeycomb structure, and preparing a sandwich of an intermediate honeycomb structure based on the mold; The upper skin, the middle honeycomb-like structured interlayer and the lower skin are connected to obtain a bionic honeycomb-like structured sandwich panel with impact resistance.

9. The method for preparing the bionic honeycomb structure sandwich panel with impact resistance according to claim 8, characterized in that: The method of constructing a model of an intermediate honeycomb-like interlayer structure and preparing an intermediate honeycomb-like interlayer structure based on the model comprises: A three-dimensional solid model of an intermediate honeycomb structure sandwich is constructed, and based on the three-dimensional solid model of the intermediate honeycomb structure sandwich, the intermediate honeycomb structure sandwich is prepared by a 3D printing process; The mold for constructing the sandwich of the intermediate honeycomb structure, based on which the sandwich of the intermediate honeycomb structure is prepared, comprises: A mold for an intermediate honeycomb structure sandwich is prepared based on the honeycomb unit in the shape of an ammonite suture line and the size of the intermediate honeycomb structure sandwich. Based on the mold, an injection molding process is used to prepare the intermediate honeycomb structure sandwich.

10. The method for preparing the bionic honeycomb structure sandwich panel with impact resistance according to claim 8, characterized in that: The upper skin and the lower skin are both made of fiber-reinforced composite materials, and the upper skin or the lower skin is obtained by the following steps: Pre-treating the fibers and dividing them into several treated fibers; After spraying the release agent on the substrate surface, applying the first thermosetting resin mixture and placing the first treated fiber; Continue to apply the next portion of the thermosetting resin mixture and place the next portion of the treated fiber, until the last portion of the thermosetting resin mixture is applied and the last portion of the treated fiber is placed, to obtain a skin precursor; After placing a guide cloth and a demoulding cloth on the surface of the skin precursor, the whole is placed in a vacuum bag, the whole material is sealed with a sealant, and a vacuum pump is connected to evacuate the whole material. After the thermosetting resin mixture is completely cured, the mold is released to obtain an upper skin or a lower skin.

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