Biomimetic honeycomb structure sandwich plate with impact resistance and preparation method thereof

Abstract

The application belongs to the field of bionic composite material structure engineering, and discloses a bionic honeycomb structure sandwich plate with impact resistance and a preparation method thereof. The bionic honeycomb structure sandwich plate with impact resistance comprises, from top to bottom, an upper skin, an intermediate bionic honeycomb structure interlayer and a lower skin. The intermediate bionic honeycomb structure interlayer is composed of a plurality of bionic nautiloid suture line-shaped honeycomb units. The bionic honeycomb structure interlayer is arranged according to the bionic nautiloid suture line shape. The honeycomb wall of each bionic nautiloid suture line-shaped honeycomb unit is in a secondary wave shape, which can effectively improve the overall strength of the sandwich plate, realize effective energy absorption and damage tolerance. The hollow feature of the bionic honeycomb structure can reduce the self-weight of the sandwich plate and endow the sandwich plate with the lightweight feature, so that the sandwich plate has a good development prospect in the impact resistance and protection field.

Description

Technical Field

[0001] This invention belongs to the field of energy absorption and protection, specifically a biomimetic honeycomb sandwich panel with impact resistance and its preparation method. Background Technology

[0002] Sandwich-structured composite materials are widely used in rail transportation, automotive, and aerospace industries due to their high specific stiffness, high specific strength, and excellent energy absorption capacity, especially in the aerospace field where lightweight and high strength are required, and in the automotive field where energy absorption and low-speed impact resistance are crucial. Sandwich-structured composite materials can absorb sufficient impact energy after being subjected to impact, preventing serious damage. Their outstanding impact resistance has attracted significant attention from researchers in the field of materials safety and protection.

[0003] Despite the significant advantages of sandwich-structured composite materials in many aspects, some performance conflicts and shortcomings still exist. Particularly under strong impact loads, the lightweight honeycomb structure struggles to withstand large impact energies, easily leading to crushing and severe material damage. How to design sandwich-structured composite materials to absorb more impact energy and convert it into plastic deformation energy while maintaining overall lightweightness, thereby improving energy absorption capacity and achieving a balance between lightweight and high impact resistance, is a pressing challenge for researchers. Summary of the Invention

[0004] The purpose of this invention is to provide a biomimetic honeycomb sandwich panel with impact resistance and its preparation method, thereby solving the problems mentioned in the background art. This invention uses an ammonite suture shape, forming an intermediate honeycomb structure sandwich layer by setting honeycomb units with secondary wave-shaped honeycomb walls in the shape of ammonite sutures. This avoids the crushing of traditional honeycomb structures under strong impact, which hinders energy absorption.

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

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

[0007] The layers arranged from top to bottom are: an upper skin, a middle honeycomb-like interlayer, and a lower skin; the middle honeycomb-like interlayer includes: several honeycomb units in the shape of ammonite sutures;

[0008] The honeycomb unit with the shape of an ammonite suture has a polygonal cross-section. Each side of the polygon includes a number of first-order waves connected in sequence. The single wave structure of the first-order wave includes a number of second-order waves connected in sequence.

[0009] The aforementioned biomimetic honeycomb sandwich panel with impact resistance is wherein the height difference between the crests and troughs of the secondary wave is smaller than the height difference between the crests and troughs of the primary wave.

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

[0011] Two adjacent honeycomb cells with the shape of an ammonite sutures share the same side.

[0012] The aforementioned biomimetic honeycomb sandwich panel with impact resistance has an upper skin and a lower skin of equal thickness. Both the upper skin and the lower skin are made of fiber-reinforced composite materials, and the fiber arrangement can be either a single arrangement or a combination arrangement. The fiber arrangement of the upper skin and the fiber arrangement of the lower skin are based on the sandwich symmetry of the intermediate honeycomb structure.

[0013] The aforementioned biomimetic honeycomb sandwich panel with impact resistance is wherein the fiber-reinforced composite material is either 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 fiber, aramid fiber, carbon nanotube, and cellulose nanofiber. The continuous fibers in the continuous fiber reinforced composite material are one or more of unidirectional fibers, 2D woven fiber fabric, and 3D woven fabric. The continuous fibers in the continuous fiber reinforced composite material are one or more of carbon fiber, glass fiber, aramid fiber, high-strength high-modulus polyethylene fiber, and basalt fiber.

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

[0015] The aforementioned biomimetic honeycomb sandwich panel with impact resistance, wherein the honeycomb cells with an ammonite-like suture shape are hollow or filled with a filling material.

[0016] A second aspect of this invention provides a method for preparing a biomimetic honeycomb sandwich panel with impact resistance, comprising:

[0017] Upper skin and lower skin are available;

[0018] Construct a model of an intermediate honeycomb structure sandwich layer, and fabricate the intermediate honeycomb structure sandwich layer based on the model; or construct a mold of an intermediate honeycomb structure sandwich layer, and fabricate the intermediate honeycomb structure sandwich layer based on the mold.

[0019] By connecting the upper skin, the intermediate honeycomb-like sandwich layer, and the lower skin, a biomimetic honeycomb sandwich panel with impact resistance is obtained.

[0020] The method for preparing the biomimetic honeycomb structure sandwich panel with impact resistance, wherein the step of constructing a model for the intermediate honeycomb structure sandwich layer, and preparing the intermediate honeycomb structure sandwich layer based on the model, includes:

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

[0022] The mold for constructing the intermediate honeycomb structure sandwich layer, and the preparation of the intermediate honeycomb structure sandwich layer based on the mold, include:

[0023] Based on the shape of ammonite sutures and the dimensions of the intermediate honeycomb structure sandwich layer, a mold for preparing the intermediate honeycomb structure sandwich layer is prepared. Based on the mold, the intermediate honeycomb structure sandwich layer is prepared by injection molding process.

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

[0025] The fibers are pretreated and divided into several portions for further treatment.

[0026] After spraying a release agent onto the substrate surface, the first portion of thermosetting resin mixture is applied and the first portion of processed fiber is placed; the next portion of thermosetting resin mixture is applied and the next portion of processed fiber is placed, until the last portion of thermosetting resin mixture is applied and the last portion of processed fiber is placed, to obtain the skin precursor.

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

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

[0029] This invention provides a biomimetic honeycomb sandwich panel with impact resistance and its preparation method. The biomimetic ammonite sutures, with their complex multi-level sutures, effectively support the outer shell, better withstand external water pressure, and enhance the overall structure, thus gaining a greater survival advantage. This invention extracts the multi-level shape elements of the ammonite sutures and combines them with the classic hexagonal structure of traditional honeycomb structures to design honeycomb units with secondary wave-shaped honeycomb walls in the shape of ammonite sutures, obtaining a biomimetic honeycomb sandwich panel. Compared to the bending deformation of traditional hexagonal honeycomb unit walls, each wave shape of the ammonite suture-shaped honeycomb unit wall undergoes torsional deformation, absorbing more impact energy and improving the material's damage resistance. In summary, this invention mimics the multi-level sutures of ammonite, setting up a honeycomb-like sandwich panel with secondary wave-shaped honeycomb walls, combined with a skin made from fiber-reinforced composite materials, effectively improving impact resistance and energy absorption capacity. Simultaneously, the honeycomb-like structure itself possesses lightweight characteristics. The resulting biomimetic honeycomb sandwich panel combines lightweight, energy absorption, and impact resistance, possessing significant application value in the field of material safety protection. Attached Figure Description

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

[0031] Figure 2 This is a schematic diagram of the sandwich structure of the intermediate honeycomb structure;

[0032] Figure 3 for Figure 2 Enlarged schematic diagram of the structure in area A;

[0033] Figure 4 A schematic diagram of a honeycomb unit in the shape of an ammonite suture.

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

[0035] Figure 6 This is a schematic diagram of a cross-section of a honeycomb unit in the shape of an ammonite suture.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Upper skin; 2. Middle honeycomb-like interlayer; 21. Primary wave; 22. Secondary wave; 3. Lower skin. Detailed Implementation

[0038] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] Sandwich-structured composite materials are widely used in various fields due to their excellent specific energy absorption, but it remains difficult to balance lightweight and high impact resistance. Inspired by nature, many organisms in the natural world possess unique structural characteristics that exhibit lightweight properties and excellent energy absorption characteristics, providing inspiration for the design of sandwich-structured composite materials. This invention mimics the multi-level suture shape of ammonites, combining it with a traditional hexagonal honeycomb structure. Vacuum-assisted molding and 3D printing methods are used to fabricate the upper and lower skins and the middle honeycomb-like sandwich layer, resulting in a biomimetic honeycomb-like sandwich panel with high impact resistance.

[0040] Ammonites, evolved from nautiluses, have survived on Earth for at least 300 million years. One of the most obvious distinguishing features between ammonites and nautiluses is their sutures. These sutures evolved from simple to complex and intricate (specifically, from nautiloid to non-angular ammonite, then to angular ammonite, then to toothed ammonite, and finally to the ammonite form). Theoretical calculations using an ammonite shell model show that the displacement, stress, and deformation of the ammonite shell significantly decrease with increasing suture complexity. Ammonites reduce strain and stress in the diaphragm by distributing the same pressure load along longer sutures. Their complex and intricate sutures effectively enhance the shell structure's strength, allowing ammonites to withstand greater water pressure and preventing diaphragmatic implosion. Compared to ammonites with simpler sutures, those with complex and intricate sutures can withstand more drastic acceleration changes during movement, gaining a greater survival advantage. This invention biomimics the complex sutures of ammonites and applies them to a polygonal honeycomb structure. By setting the polygonal honeycomb walls to a two-dimensional wave shape, it can bear greater loads and impacts, achieving a balance between lightweight and high impact resistance.

[0041] This invention provides a biomimetic honeycomb sandwich panel with impact resistance as an integral structure. Figure 1 As shown, the sandwich panel includes, from top to bottom, an upper skin 1, a middle honeycomb-like sandwich layer 2, and a lower skin 3. The upper skin 1 and lower skin 3 provide the overall material rigidity of the sandwich panel, enhancing its impact resistance. In particular, the upper skin 1 is the first to contact the impact load, bearing the maximum impact force and transferring the stress to the middle honeycomb-like sandwich layer 2. The upper skin 1 and lower skin 3 enhance the overall structural stability. Increasing the thickness of the upper skin 1 and lower skin 3 increases the peak impact force, thus strengthening the impact resistance of the sandwich panel.

[0042] like Figure 2 As shown, the intermediate honeycomb structure sandwich layer 2 includes several honeycomb units shaped like ammonite sutures. These ammonite suture-shaped honeycomb units can remain hollow or have fillers such as PMI foam added. Multiple ammonite suture-shaped honeycomb units can disperse the stress transmitted by the upper skin 1, achieving high-efficiency energy absorption. The ammonite suture-shaped honeycomb units mimic the sutures of an ammonite, and feature a secondary wave-shaped honeycomb wall, such as... Figure 3 , Figure 4 as well as Figure 5 As shown. The cross-section of the honeycomb unit, which mimics the shape of ammonite sutures, is polygonal, as... Figure 6 As shown, each side of the polygon includes several sequentially connected primary waves 21, and each primary wave 21 consists of several sequentially connected secondary waves 22. Under compressive loads, compared to the energy absorbed by the progressive bending of traditional honeycomb structures, the honeycomb wall with a secondary wave shape exhibits a large number of plastic hinges, has significantly different torsional deformation, can withstand greater stress and deformation, and greatly improves energy absorption performance.

[0043] The height difference between the crest and trough of the secondary wave 22 is less than that of the primary wave 21. The height difference between crest and trough refers to the height difference between adjacent crests and troughs. The crests and troughs of the primary wave 21 are located on opposite sides of the edge containing the primary wave 21. The crests and troughs of the secondary wave 22 are located on opposite sides of the primary wave 21. The height difference between the crests and troughs in the secondary wave 22 is smaller, while the height difference between the crests and troughs in the primary wave 21 is larger.

[0044] The polygon is a regular hexagon; two adjacent honeycomb units in the shape of ammonite stitching share the same side. The polygon can be a regular hexagon because regular hexagons can be brought close together to form a seamless planar shape, and because a regular hexagon is close to a circle, it is beneficial for achieving higher strength.

[0045] The upper skin 1 and the lower skin 3 have the same thickness. 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 intermediate honeycomb structure sandwich 2.

[0046] Specifically, both the upper skin 1 and the lower skin 3 are fiber-reinforced composite materials. The upper skin 1 and the lower skin 3 have the same thickness, which helps to enhance the stability of the overall structure. The fiber arrangement can be a single arrangement or a combination arrangement. The fiber arrangement of the upper skin 1 and the lower skin 3 is symmetrical based on the intermediate honeycomb structure sandwich layer 2. The fiber-reinforced composite material is either a chopped fiber reinforced composite material or a continuous fiber reinforced composite material. In the chopped fiber reinforced composite material, the chopped fibers are one or more of carbon fiber, aramid fiber, carbon nanotube, and cellulose nanofiber. In the continuous fiber reinforced composite material, the continuous fibers are one or more of unidirectional fibers, 2D woven fiber cloth, and 3D woven cloth. In the continuous fiber reinforced composite material, the continuous fibers are one or more of carbon fiber, glass fiber, aramid fiber, high-strength high-modulus polyethylene fiber, and basalt fiber. For example, carbon fiber has high tensile and compressive strength and stiffness, while glass fiber has good toughness and better impact resistance. Combining the performance characteristics of both, carbon fiber and glass fiber are interleaved and arranged to obtain excellent comprehensive performance.

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

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

[0049] S1. Provide upper and lower skin;

[0050] S2. Construct a model of an intermediate honeycomb structure sandwich layer, and prepare the intermediate honeycomb structure sandwich layer based on the model; or construct a mold of an intermediate honeycomb structure sandwich layer, and prepare the intermediate honeycomb structure sandwich layer based on the mold.

[0051] S3. Connect the upper skin, the intermediate honeycomb structure sandwich panel, and the lower skin to obtain a biomimetic honeycomb structure sandwich panel with impact resistance.

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

[0053] S2 specifically includes:

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

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

[0056] S2 specifically includes:

[0057] S22. A mold for preparing the intermediate honeycomb structure sandwich layer based on the dimensions of the honeycomb unit with the shape of an ammonite suture and the intermediate honeycomb structure sandwich layer, and the intermediate honeycomb structure sandwich layer prepared by injection molding process based on the mold.

[0058] Specifically, the intermediate honeycomb structure sandwich layer is prepared by injection molding. First, a mold for the intermediate honeycomb structure sandwich layer is prepared, and then injection molding is performed based on the mold. The intermediate honeycomb structure sandwich layer is obtained through steps such as mold closing, filling, pressure holding, cooling, mold opening, and demolding.

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

[0060] A1. The fiber is pretreated and divided into several parts for treatment.

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

[0062] A3. After placing the flow guide cloth and release cloth on the surface of the skin precursor, place the whole body in a vacuum bag, seal the whole material with sealant, connect a vacuum pump to evacuate the vacuum, and demold the thermosetting resin mixture after it has completely cured to obtain the upper skin or lower skin.

[0063] Specifically, the skin (including the upper and lower skins) is made of fiber-reinforced composite material, specifically fiber-reinforced resin material. After providing the fiber and thermosetting resin mixture, the fibers are pretreated, including removing adhesives and impurities, and drying. Then, the fibers are arranged in a certain pattern in the thermosetting resin mixture to obtain the skin precursor. The fibers can be chopped fibers or continuous fibers. Chopped fibers are usually uniformly dispersed in the thermosetting resin mixture, while continuous fibers can be unidirectionally arranged (forming unidirectional fibers in each layer, and different layers can change the arrangement direction to form unidirectional fibers with different arrangement directions), two-dimensional (2D) woven fabric, or three-dimensional (3D) woven fabric. To improve the uniformity of fiber distribution, the fibers are divided into several parts (e.g., N parts) and the thermosetting resin mixture is also divided into several parts (e.g., N+1 parts). The fibers and thermosetting resin mixture are alternately laid out in layers, ensuring full contact and uniform dispersion between the fibers and the thermosetting resin mixture. A flow guide cloth and a release cloth are placed on the skin precursor. The skin precursor, flow guide cloth, release cloth, and substrate (which can be a glass plate) are then placed together in a vacuum bag. The vacuum bag is sealed and a vacuum is applied, allowing the thermosetting resin mixture to solidify. After demolding, the skin is obtained.

[0064] Specific application examples:

[0065] (1) The skin was prepared using a vacuum-assisted molding method. Several unidirectional carbon fiber cloths and glass fiber cloths of the same size were cut to a certain dimensions and soaked in acetone solution for 48 hours to remove surface adhesive and impurities. After removal, they were dried at 80°C. A release agent was sprayed onto the glass surface, and a certain mass of slow-drying E51 resin mixture was coated on its surface. A layer of carbon fiber cloth was placed on the surface of the resin mixture mold. The same mass of resin mixture was coated on the surface of the first layer of carbon fiber cloth. A second layer of glass fiber cloth was laid perpendicular to the direction of the carbon fiber cloth. The same operation process was repeated to prepare a skin precursor with 12 layers of fiber cloth. A flow guide cloth and a release cloth were placed on the surface of the skin precursor. The whole thing was placed in a vacuum bag and sealed with sealant. A vacuum pump was connected and vacuumed for 12 hours. The vacuum was maintained for 12 hours to allow the resin mixture to completely solidify. The mold was then removed to obtain the skin.

[0066] (2) The intermediate honeycomb structure sandwich layer was prepared by 3D printing. A three-dimensional solid model of the intermediate honeycomb structure sandwich layer was constructed in 3D software. The STL format data was imported into the 3D printer. The structure was sliced ​​by the software, and the printing material was stacked layer by layer and gradually assembled into a whole.

[0067] (3) Combine the upper and lower skins with the intermediate honeycomb structure sandwich layer. Use an adhesive to bond the obtained intermediate honeycomb structure sandwich layer with the upper and lower skins, and cure it under certain pressure and temperature to obtain a biomimetic honeycomb structure sandwich panel with impact resistance.

[0068] In summary, this invention provides a biomimetic honeycomb structure sandwich panel with impact resistance and its preparation method, comprising: upper and lower skins and a middle honeycomb structure sandwich layer. The middle honeycomb structure sandwich layer is composed of several honeycomb units in the shape of ammonite sutures. These ammonite suture-shaped honeycomb units have secondary wave-shaped honeycomb walls, providing a large number of plastic hinges within different size ranges, generating torsional deformations different from traditional honeycomb structures, and absorbing more impact energy. The upper and lower skins provide overall structural stability and impact resistance, transmitting and dispersing stress to the several ammonite suture-shaped honeycomb units. This invention's biomimetic honeycomb structure sandwich panel, combining ammonite multi-level sutures and a honeycomb structure, achieves high impact resistance and excellent energy absorption while maintaining a lightweight design, showing promising application prospects in the field of material protection and energy absorption.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that modifications and variations can be made to these embodiments without departing from the principles and spirit of the invention, and all such modifications and variations should fall within the scope of protection of the appended claims.

Claims

1. A biomimetic honeycomb sandwich panel with impact-resistant properties, characterized in that, include: The layers arranged from top to bottom are: an upper skin, a middle honeycomb-like interlayer, and a lower skin. The intermediate honeycomb structure includes a number of honeycomb units in the shape of ammonite sutures. The honeycomb unit with the shape of an ammonite suture has a polygonal cross-section. Each side of the polygon includes a number of first-order waves connected in sequence. The single wave structure of the first-order wave includes a number of second-order waves connected in sequence. The height difference between the peaks and troughs of the second-order wave is less than that of the first-order wave. The polygon is a regular hexagon; Two adjacent honeycomb cells with the shape of an ammonite sutures share the same side; The upper skin and the lower skin have the same thickness. 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 based on the sandwich symmetry of the intermediate honeycomb structure. The upper skin or the lower skin is obtained through the following steps: The fibers are pretreated and divided into several portions; the fibers are continuous fibers. After spraying a release agent onto the substrate surface, the first thermosetting resin mixture is applied and the first processed fiber is placed; the next thermosetting resin mixture is applied and the next processed fiber is placed, until the last thermosetting resin mixture is applied and the last processed fiber is placed, to obtain the skin precursor; unidirectional fibers are formed in each layer, and the arrangement direction is changed in different layers to form unidirectional fibers with different arrangement directions. After placing a flow guide cloth and a release cloth on the surface of the skin precursor, the whole body is placed in a vacuum bag, the whole material is sealed with sealant, a vacuum pump is connected to evacuate the vacuum, and the thermosetting resin mixture is completely cured before demolding to obtain the upper skin or lower skin.

2. The biomimetic honeycomb sandwich panel with impact resistance according to claim 1, characterized in that, The continuous fiber is one or more of carbon fiber, glass fiber, aramid fiber, high-strength high-modulus polyethylene fiber, and basalt fiber.

3. The biomimetic honeycomb sandwich panel with impact resistance according to claim 1, characterized in that, The interlayer of the intermediate honeycomb structure is made of one or more of organic polymers and metals, and the interlayer of the intermediate honeycomb structure is prepared by 3D printing or injection molding.

4. The biomimetic honeycomb sandwich panel with impact resistance according to claim 1, characterized in that, The honeycomb unit, which resembles an ammonite suture, is hollow or filled with a filling material.

5. A method for preparing a biomimetic honeycomb sandwich panel with impact resistance as described in any one of claims 1-4, characterized in that, include: Upper skin and lower skin are available; A model of an intermediate honeycomb structure sandwich layer is constructed, and the intermediate honeycomb structure sandwich layer is prepared based on the model; Alternatively, a mold for constructing an intermediate honeycomb structure sandwich layer can be used to prepare the intermediate honeycomb structure sandwich layer based on the mold. By connecting the upper skin, the intermediate honeycomb-like sandwich layer, and the lower skin, a biomimetic honeycomb sandwich panel with impact resistance is obtained.

6. The method for preparing the biomimetic honeycomb structure sandwich panel with impact resistance according to claim 5, characterized in that, The model for constructing the intermediate honeycomb structure sandwich layer, and the fabrication of the intermediate honeycomb structure sandwich layer based on the model, include: A three-dimensional solid model of the intermediate honeycomb structure sandwich layer is constructed, and based on the three-dimensional solid model of the intermediate honeycomb structure sandwich layer, the intermediate honeycomb structure sandwich layer is prepared by 3D printing process. The mold for constructing the intermediate honeycomb structure sandwich layer, and the preparation of the intermediate honeycomb structure sandwich layer based on the mold, include: Based on the shape of ammonite sutures and the dimensions of the intermediate honeycomb structure sandwich layer, a mold for preparing the intermediate honeycomb structure sandwich layer is prepared. Based on the mold, the intermediate honeycomb structure sandwich layer is prepared by injection molding process.

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