A lightweight armor protection target structure based on a biomimetic tortoise shell and its manufacturing method

Abstract

This invention relates to the field of biomimetic impact-resistant structure technology, specifically to a lightweight armored protective target structure based on a biomimetic tortoise shell, comprising a five-layer plate structure: a ceramic plate, a laminated carbon nanotube aluminum-based composite material plate, an ultra-high molecular weight polyethylene fiber plate, a graphene aluminum-based composite core plate, and a titanium alloy backing plate, which are sequentially bonded together using an adhesive film layer; the laminated carbon nanotube aluminum-based composite material plate is formed by multiple cells arranged in a certain pattern; the ultra-high molecular weight polyethylene fiber plate is obtained by hot pressing multiple layers of high molecular weight polyethylene non-woven fabric; the graphene aluminum-based composite core plate is composed of G-shaped three-period minimal curved surface thin sheet structure, and the pore size of the graphene aluminum-based composite core plate gradually decreases from the ceramic plate to the titanium alloy backing plate. This invention significantly reduces the overall weight of the structure while improving impact resistance, achieving a balance between lightweight and high strength.

Description

Technical Field

[0001] This invention relates to the field of biomimetic impact-resistant structure technology, and in particular to a lightweight armored protective target structure based on a biomimetic tortoise shell and its manufacturing method. Background Technology

[0002] In recent years, safety protection has received increasing attention. To improve the safety and protection capabilities of modern equipment and ensure personnel safety, protective armor is widely used to enhance the equipment's ballistic resistance. However, protective armor occupies space, increases the weight of equipment, and affects the flexibility of modern equipment use. Limited by space and weight, modern equipment only uses armored targets in core areas, employing lightweight structures for protection in secondary areas. This localized protection poses a serious threat to personnel safety. Increasing the protective area of ​​modern equipment armor to achieve a balance between lightweight and high-strength protection is a necessary choice for improving the protective capabilities of modern equipment. Therefore, designing a lightweight, high-strength, impact-resistant protective armor target structure is particularly important.

[0003] Chinese Patent Publication No. CN215707177U, entitled "A Protective Armor for Armed Helicopters with a Specific Gradient Structure," proposes a protective armor for armed helicopters consisting of four layers of rigid, decreasing gradient structure bonded from top to bottom: ceramic plate, carbon fiber plate, aramid fiber plate, and ultra-high molecular weight polyethylene fiber plate. This armor leverages the decreasing rigidity of the materials to fully utilize the advantages of each layer, improving the armor's impact resistance and the protected area of ​​the armed helicopter while minimizing the armor's surface density. However, the overall weight of the armor with the decreasing rigidity gradient structure is relatively large, and it has high requirements for material performance, limiting the types of materials that can be used. Different rigidity materials need to be matched for performance, and the structural form is relatively simple. This structure cannot fully improve the armor's penetration resistance and impact resistance.

[0004] Chinese Patent Publication No. CN107498948B, entitled "A Multi-Layer Gradient Lattice Sandwich Panel and Its Preparation Method," proposes a multi-layer gradient lattice sandwich panel using perforated rhomboid plates of varying thicknesses as core layers, arranged in a cyclical alternation and welded to a metal panel and partitions. The core layers of this sandwich panel exhibit differential deformation, allowing it to effectively absorb impact energy through buckling deformation, thus providing protection. However, the overall structure is complex, requiring precise control of the positions between the vertices of the pyramid-shaped lattice cores and their positions with the metal panel and partitions. The preparation process is cumbersome, especially the high precision requirements for the pyramid-shaped lattice cores, which increases the difficulty of fabrication. While the lattice structure fully utilizes the core layers, the metal front and rear panel structures have not been optimized to further enhance their protective performance.

[0005] Therefore, how to provide a lightweight, high-strength, impact-resistant armor protection structure, especially an armor protection target structure, that not only fully utilizes the excellent performance of each layer but also reduces the weight of the armor and improves the flexibility of modern protective equipment, is an urgent problem to be solved. Summary of the Invention

[0006] The purpose of this invention is to solve the above problems by providing a lightweight armor protection target structure based on a biomimetic tortoise shell and its manufacturing method, which effectively improves the protective performance.

[0007] The technical solution adopted is as follows:

[0008] A lightweight armor-like protective target structure based on a biomimetic tortoise shell comprises a five-layer plate structure: a ceramic plate, a laminated carbon nanotube aluminum-based composite material plate, an ultra-high molecular weight polyethylene fiber plate, a graphene aluminum-based composite material core layer plate, and a titanium alloy backing plate, wherein the five layers are sequentially bonded together using an adhesive film layer; wherein...

[0009] The laminated carbon nanotube aluminum-based composite material plate is formed by arranging multiple cells according to a certain rule. The rule is as follows: the cells are arranged in a staggered manner. The first layer starts with a complete cell and ends with a complete cell, and the remaining positions in the first layer are also complete cells. The second layer starts with half a cell and ends with half a cell, and the remaining positions in the second layer are complete cells. The first layer and the second layer of the panel are arranged in two layers from top to bottom along the direction perpendicular to the ceramic plate, or multiple layers are arranged in a cyclical alternation.

[0010] The ultra-high molecular weight polyethylene fiberboard is obtained by hot pressing multiple layers of high molecular weight polyethylene non-woven fabric.

[0011] The graphene-aluminum composite core plate is composed of a G-type three-period minimal surface sheet structure. The implicit function of the model corresponding to the G-type three-period minimal surface sheet structure is G(x,y,z)=sin(ω). x x)cos(ω y y)+sin(ω y y)cos(ω z z)+sin(ω z z)cos(ω x x)=C, where, ω x ω y ω z C is the periodic parameter, C is the curvature parameter, where C = 0, x, y, z are the coordinates of each point on the surface of the G-type thin sheet in the coordinate system, and the pore size of the graphene aluminum-based composite core plate gradually decreases from the ceramic plate to the titanium alloy back plate.

[0012] Furthermore, the ceramic plate is made of boron carbide ceramic with a density of 2.58 g / cm³. 3 The flexural strength is greater than 400 MPa, and the porosity of the graphene aluminum-based composite core plate is 60%.

[0013] Furthermore, the titanium alloy back plate is made of TC4 titanium alloy plate, and the tensile strength of the titanium alloy back plate is ≥989Mpa, the yield strength is ≥916Mpa, and the elongation is ≥14.5%. The titanium alloy back plate also has reinforcing ribs, and each side of the reinforcing ribs is rounded to reduce stress concentration. The reinforcing ribs are evenly distributed in the back plate.

[0014] Furthermore, the ultra-high molecular weight polyethylene fiberboard is made of HA-894 fiber, and the adhesive film layer is made of polyurethane adhesive, epoxy resin adhesive, or polyethylene resin adhesive.

[0015] Furthermore, the overall dimensions of the armored protective target structure are: 100mm*100mm*50mm, the ceramic plate thickness is 10mm, the laminated carbon nanotube aluminum-based composite material plate thickness is 5mm, the ultra-high molecular weight polyethylene fiber plate thickness is 20mm, the graphene aluminum-based composite material core layer plate thickness is 7mm, and the TC4 titanium alloy backing plate thickness is 4mm.

[0016] A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell involves sequentially bonding a ceramic plate, a laminated carbon nanotube aluminum-based composite material plate, an ultra-high molecular weight polyethylene fiber plate, a graphene aluminum-based composite core plate, and a TC4 titanium alloy backing plate together using an epoxy resin film layer, followed by curing at a temperature of 120-125℃ for 1-2 hours and a curing pressure of 0.1-0.3 MPa.

[0017] Furthermore, the titanium alloy back plate is made by melting sponge titanium as raw material in a vacuum arc remelting furnace to form a slab, which is then processed by heating and rolling.

[0018] Furthermore, the manufacturing method of the layered carbon nanotube aluminum matrix composite plate includes: mixing and ball milling carbon nanotubes and aluminum alloy powder to obtain carbon nanotube aluminum alloy sheet material; oriented arranging the sheet material under uniaxial stress to obtain an ordered initial layered composite material; and then performing subsequent densification processes such as vacuum hot pressing, hot forging, and hot rolling to obtain a carbon nanotube aluminum alloy block with a layered microstructure; and cutting the pressed block into 20*20mm sizes as a cell and arranging them in a staggered manner.

[0019] Furthermore, the ultra-high molecular weight polyethylene fiberboard is made by preparing polyethylene fibers using polyethylene granules, and then hot-pressing them using multilayer high molecular weight polyethylene non-woven fabric.

[0020] Furthermore, the manufacturing method of the graphene aluminum-based composite core plate includes: mixing and ball milling graphene and aluminum alloy to obtain graphene aluminum-based composite powder; using the graphene aluminum-based composite powder as raw material, inputting the STL format file of the G-type three-period minimal curved surface thin sheet structure model into a 3D printer for 3D printing to print the G-type curved surface graphene aluminum-based composite core plate.

[0021] The beneficial effects of this invention compared to the prior art are as follows:

[0022] 1. The multilayered carbon nanotube aluminum-based composite material plate structure of the present invention is composed of multiple cells arranged in a certain pattern. The multilayered panel structure and the staggered structure of the cells are more conducive to stress dispersion. When the panel is impacted, the cracks caused by the external force will be deflected, and the stress can be distributed more evenly, improving the cracking condition of the multilayered carbon nanotube aluminum-based composite material plate and enhancing its impact resistance. The titanium alloy back plate structure has a reinforcing rib structure, which can improve the overall support performance of the structure, further improve the mechanical properties of the overall structure, and alleviate stress concentration.

[0023] 2. The graphene-aluminum composite core plate of this invention uses a G-type three-period minimal curved surface structure, which has excellent properties such as diversity, smooth surface, interconnected pores, and high specific surface area. It can reduce stress concentration, has good energy absorption effect and impact resistance. The porosity and pore gradient change are also controllable and can be prepared by 3D printing. The preparation method is simple and feasible, which is more conducive to the preparation of high-performance porous structures. The porous structure of the core plate can greatly reduce the overall weight of the structure while meeting the impact resistance requirements, achieving a balance between lightweight and high strength. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A three-dimensional schematic diagram of a traditional sandwich structure;

[0026] Figure 2 This is a two-dimensional planar schematic diagram of a traditional sandwich structure;

[0027] Figure 3 This is a three-dimensional schematic diagram of the biomimetic tortoise shell armor protection target structure according to an embodiment of the present invention;

[0028] Figure 4This is a two-dimensional planar schematic diagram of the biomimetic tortoise shell armor protection target structure according to an embodiment of the present invention;

[0029] Figure 5 This is a three-dimensional schematic diagram of a laminated carbon nanotube aluminum matrix composite plate according to an embodiment of the present invention;

[0030] Figure 6 This is a three-dimensional schematic diagram of the graphene-aluminum composite core plate according to an embodiment of the present invention;

[0031] Figure 7 This is a three-dimensional perspective view of the titanium alloy back plate according to an embodiment of the present invention;

[0032] The annotations in the attached figures are explained as follows:

[0033] Among them, 1—Layered carbon nanotube aluminum-based composite material plate, 2—Graphene aluminum-based composite material core plate, 3—Titanium alloy back plate, 4—Cuboid cell, 5—Fine reinforcing rib, 6—Coarse reinforcing rib, 7—Ceramic plate, 8—Epoxy resin film layer, 9—Ultra-high molecular weight polyethylene fiber plate. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings:

[0036] Examples of the present invention, such as Figure 3 , Figure 4 As shown, the target material comprises a ceramic plate 7, a laminated carbon nanotube aluminum-based composite material plate 1, an ultra-high molecular weight polyethylene fiber plate 9, a graphene aluminum-based composite core layer plate 2, and a titanium alloy backing plate 3, which are bonded together in sequence using an epoxy resin film layer 8 to form a five-layer lightweight armored protective target material. The overall dimensions of the armored protective target material structure are 100mm*100mm*50mm. The ceramic plate 7 is 10mm thick, the laminated carbon nanotube aluminum-based composite material plate 1 is 5mm thick, the ultra-high molecular weight polyethylene fiber plate 9 is 20mm thick, the graphene aluminum-based composite core layer 2 is 7mm thick, and the TC4 titanium alloy backing plate 3 is 4mm thick. Due to the presence of film layers between the layers, the overall thickness is approximately 50mm.

[0037] The laminated carbon nanotube aluminum-based composite material plate 1 is produced by ball milling carbon nanotubes and aluminum alloy powder to obtain carbon nanotube aluminum alloy sheets. These sheets are then oriented under uniaxial stress to obtain an ordered initial layered composite material. Subsequent densification processes, such as vacuum hot pressing, hot forging, and hot rolling, result in a dense, laminated carbon nanotube aluminum alloy block with a good microstructure. This biomimetic laminated microstructure enhances the mechanical properties of the aluminum alloy, significantly improving tensile strength and fracture toughness, and greatly increasing the material's energy absorption effect. The pressed block is then cut into 20*20mm blocks as a cell and arranged in a staggered manner. Figure 5 As shown, when this biomimetic structure is subjected to impact, the external and internal misaligned stacked structures further promote the deflection of cracks, resulting in a uniform distribution of force. This provides strong support for the ceramic plate and greatly improves its impact resistance.

[0038] The laminated carbon nanotube aluminum matrix composite plate 1 is formed by multiple cells arranged in a certain pattern.

[0039] The certain rule is as follows: the cells are arranged in a staggered manner. The first layer starts with a complete cell and ends with a complete cell, and the remaining positions in the first layer are also complete cells. The second layer starts with half a cell and ends with half a cell, and the remaining positions in the second layer are complete cells. The first layer and the second layer of the panel are arranged in two layers from top to bottom along the direction perpendicular to the ceramic plate, or multiple layers are arranged in a cyclical alternation.

[0040] The cells in each layer are connected by an adhesive, which may be a polyurethane adhesive, an epoxy resin adhesive, or a polyethylene resin adhesive.

[0041] The thickness of the laminated carbon nanotube aluminum matrix composite plate 1 is determined by the number of cell layers and the thickness of the cell, and the length is determined by the number of cells and the length of the cell.

[0042] The ultra-high molecular weight polyethylene fiberboard 9 is made by preparing polyethylene fibers from polyethylene granules, and then hot-pressing dozens of layers of high molecular weight polyethylene non-woven fabric to obtain the ultra-high molecular weight polyethylene fiberboard. HA-894 fiber is preferred. The mechanical properties of the high molecular weight polyethylene fiberboard are approximately 40 cN / dtex, and the modulus is approximately 1800 cN / dtex, which can effectively resist bullet penetration.

[0043] The graphene-aluminum composite core plate 2 is composed of a G-type three-period minimal surface sheet structure. The three-period minimal surface is a surface whose curvature is zero everywhere in three-dimensional space, with each surface exhibiting periodic variations. The implicit function corresponding to the G-type three-period minimal surface structure is G(x,y,z)=sin(ω x x)cos(ω yy)+sin(ω y y)cos(ω z z)+sin(ω z z)cos(ω x x)=C, where, ω x ω y ω z ω is the periodic parameter, and C is the curvature parameter, where C = 0, and x, y, z are the coordinates of points on the G-shaped thin sheet surface in the coordinate system. Different values ​​of the periodic parameter ω and the curvature parameter C can generate gradually changing or non-uniform porous structures. The porosity of the core layer gradually decreases from the ceramic plate to the titanium alloy backing plate, with a porosity of 60%. A certain mass fraction of graphene is mixed with aluminum alloy and ball-milled to obtain graphene-aluminum matrix composite powder. Using this powder as raw material, the STL format file of the three-period minimal surface model is input into a 3D printer for 3D printing, producing a G-shaped curved core layer. Graphene enhances the mechanical properties of the aluminum alloy, the porous structure of the core layer reduces the mass of the armor, and improves its buffering and energy absorption capacity. Using 3D printing technology to print this porous structure greatly improves the efficiency of the fabrication process.

[0044] Titanium alloy backplate 3, preferably TC4 titanium alloy plate, is made by melting sponge titanium in a vacuum arc remelting furnace to form a slab, and then undergoing basic processing such as heating and rolling to obtain the final titanium alloy plate. The tensile strength is ≥989Mpa, the yield strength is ≥916Mpa, and the elongation is ≥14.5%. The backplate with reinforcing ribs enhances the support of the backplate and can better withstand the impact of bullets.

[0045] The ceramic plate 7, the laminated carbon nanotube aluminum-based composite plate 1, the ultra-high molecular weight polyethylene fiber plate 9, the graphene aluminum-based composite core plate 2, and the TC4 titanium alloy backing plate 3 are sequentially bonded together using an epoxy resin adhesive film layer 8. The bonding is then cured at 120-125℃ for 1-2 hours under a pressure of 0.1-0.3 MPa. The epoxy resin adhesive film layer has a shear strength of 30.0 MPa at room temperature, effectively bonding the various layers of the armor plate together and increasing stability. The curing of the epoxy resin adhesive film layer sequentially bonds and fixes the ceramic plate, laminated carbon nanotube aluminum-based composite plate, ultra-high molecular weight polyethylene fiber plate, graphene aluminum-based composite core plate, and TC4 titanium alloy backing plate into a single unit, resulting in an armored protective target material.

[0046] Compared with existing ones Figure 1 , Figure 2Compared to the sandwich armor protection structure shown, the armor protection target structure of the present invention not only complements each other in terms of material properties, improving the overall mechanical impact resistance, but also adopts a biomimetic structural design, further improving the impact resistance and protection capabilities of the armor while reducing the weight of the armor, achieving a balance between lightweight and high strength.

[0047] Furthermore, this armored protective target structure can effectively protect against frontal attacks from 12.7mm armor-piercing incendiary rounds, with a small damage area on the incoming surface and good protective performance, making it effective for use in modern protective equipment.

[0048] Specific example 1:

[0049] like Figures 5 to 7 As shown, the specific configuration of the armor protection target structure in this embodiment is as follows:

[0050] like Figure 5 As shown, each layer of the laminated carbon nanotube aluminum matrix composite plate consists of 25 cuboid cells, each with the same length and width of 20 mm. Each layer is approximately 1.7 mm thick, and there are three layers in total, with a total thickness of 5 mm. The arrangement is as follows: Figure 5 The layers are arranged as shown, with the first layer starting and ending with complete cuboid cells on both sides, and the remaining positions being complete cells. The second layer starts and ends with half a cuboid cell on both sides, and the remaining positions are complete cells. This arrangement can expand the crack propagation range, improve the stress dispersion ability of the laminated carbon nanotube aluminum matrix composite plate, and thus improve its impact resistance.

[0051] The rectangular cubic cells are connected using adhesives such as polyurethane adhesive, epoxy resin adhesive, and polyethylene resin adhesive.

[0052] The graphene-aluminum matrix composite core plate is composed of a G-type three-period minimal curved surface sheet structure with dimensions of 100mm*100mm*7mm; for example... Figure 6 As shown, the implicit function corresponding to this G-type three-period minimal surface structure is G(x,y,z)=sin(0.5πx)cos(0.5πy)+sin(0.5πy)cos(0.5πz)+sin(0.5πz)cos(0.5πx)=0, where x, y, and z are the coordinates of each point on the G-type thin sheet surface in the coordinate system. The porosity of the core plate gradually decreases from the ceramic plate to the titanium alloy back plate, with a porosity of 60%. The thickness of the G-type three-period minimal surface sheet is 1mm. The period parameters and curvature parameters can be changed according to the actual situation to obtain the desired structure. Table 1 below shows the influence of different gradient changes of the graphene-aluminum composite core plate on the impact resistance performance of the armor protection target structure obtained by finite element calculation.

[0053] Table 1

[0054] Core layer board name Absorbed energy (J) Uniform Porosity Core Plate 2597 Negative gradient porous core plate (pore size from largest to smallest) 2765 Positive gradient porosity core plate (pore size increasing from small to large) 2698

[0055] like Figure 7 As shown, the titanium alloy backplate incorporates three reinforcing ribs to enhance its support. The backplate measures 100mm x 100mm x 4mm. The total volume of the fine reinforcing ribs 5 is the same as that of the coarse reinforcing ribs 6. The ribs are 1mm thick. Different numbers of ribs can be added to achieve the desired support effect. Table 2 below shows the impact resistance of armored target structures with different numbers of reinforcing ribs, calculated using finite element analysis.

[0056] Table 2

[0057] Quantity (N) Absorbed energy (J) 0 2499 1 2654 2 2765 3 2653

[0058] As can be seen from the table, the armored protective target structure with reinforcing ribs prepared according to the biomimetic structure absorbs more energy than the armored protective target structure without reinforcing ribs. The more energy absorbed, the higher the impact buffering capacity of the armored protective target structure, and it has certain advantages in enhancing impact resistance. Different numbers of reinforcing ribs can be selected according to different needs.

[0059] In summary, the biomimetic tortoise shell lightweight armored protective target structure of this invention allows each layer to fully utilize its mechanical advantages, significantly reducing the overall weight while meeting impact resistance requirements, thus achieving both lightweight and high strength. Upon impact, the misaligned structure of the cuboid cells deflects cracks caused by external forces, resulting in a more uniform stress distribution. This improves the cracking condition of the laminated carbon nanotube aluminum-based composite plate and increases impact resistance. The G-type three-period minimal curved surface core plate has a smooth and continuous surface with interconnected pores and a high specific surface area, reducing stress concentration and providing excellent energy absorption and impact resistance. The reinforcing rib backplate enhances support performance, further improving the mechanical properties of the armored protective target structure and alleviating stress concentration.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A lightweight armored protective target structure based on a biomimetic tortoise shell, characterized in that, The structure comprises five layers: a ceramic plate, a laminated carbon nanotube aluminum-based composite material plate, an ultra-high molecular weight polyethylene fiber plate, a graphene aluminum-based composite core layer, and a titanium alloy backing plate. These five layers are bonded together sequentially using an adhesive film layer. The laminated carbon nanotube aluminum-based composite material plate is formed by arranging multiple cells according to a certain rule. The rule is as follows: the cells are arranged in a staggered manner. The first layer starts and ends with a complete cell, and the remaining positions in the first layer are also complete cells. The second layer starts and ends with half a cell, and the remaining positions in the second layer are complete cells. The first and second layers are arranged in two layers from top to bottom along the direction perpendicular to the ceramic plate, or in multiple layers arranged in a cyclical alternation. The ultra-high molecular weight polyethylene fiberboard is obtained by hot pressing multiple layers of high molecular weight polyethylene non-woven fabric. The graphene-aluminum matrix composite core plate is composed of a G-type three-period minimal surface sheet structure. The implicit function of the model corresponding to the G-type three-period minimal surface sheet structure is G(x,y,z)=sin( ω x x)cos( ω y y)+sin( ω y y)cos( ω z z)+sin( ω z z)cos( ω x x)=C, where, ω x ω y ω z C is the periodic parameter, C is the curvature parameter, where C=0, x, y, z are the coordinates of each point on the surface of the G-type thin sheet in the coordinate system, and the pore size of the graphene aluminum-based composite core plate gradually decreases from the ceramic plate to the titanium alloy back plate.

2. The lightweight armor protection target structure based on a biomimetic tortoise shell as described in claim 1, characterized in that, The ceramic plate is made of boron carbide ceramic with a density of 2.58 g / cm³. 3 The flexural strength is greater than 400 MPa, and the porosity of the graphene aluminum-based composite core plate is 60%.

3. The lightweight armor protection target structure based on a biomimetic tortoise shell according to claim 2, characterized in that, The titanium alloy back plate is made of TC4 titanium alloy plate, with a tensile strength ≥989 MPa, a yield strength ≥916 MPa, and an elongation ≥14.5%. The titanium alloy back plate also has reinforcing ribs, each of which has rounded corners to reduce stress concentration, and the reinforcing ribs are evenly distributed in the back plate.

4. The lightweight armor protection target structure based on a biomimetic tortoise shell according to claim 3, characterized in that, The ultra-high molecular weight polyethylene fiberboard is made of HA-894 fiber, and the adhesive film layer is made of polyurethane adhesive, epoxy resin adhesive, or polyethylene resin adhesive.

5. The lightweight armored protective target structure based on a biomimetic tortoise shell as described in claim 4, characterized in that, The overall dimensions of the armored protective target structure are: 100mm*100mm*50mm, with a ceramic plate thickness of 10mm, a laminated carbon nanotube aluminum-based composite material plate thickness of 5mm, an ultra-high molecular weight polyethylene fiber plate thickness of 20mm, a graphene aluminum-based composite material core layer plate thickness of 7mm, and a TC4 titanium alloy backing plate thickness of 4mm.

6. A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell according to any one of claims 1-5, characterized in that, A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell involves sequentially bonding a ceramic plate, a laminated carbon nanotube aluminum-based composite material plate, an ultra-high molecular weight polyethylene fiber plate, a graphene aluminum-based composite core plate, and a TC4 titanium alloy backing plate together using an epoxy resin film layer, followed by curing at a temperature of 120-125℃ for 1-2 hours and a curing pressure of 0.1-0.3 MPa.

7. A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell according to claim 6, characterized in that, The titanium alloy back plate is made by melting sponge titanium as raw material in a vacuum arc remelting furnace to form a slab, which is then processed by heating and rolling.

8. A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell according to claim 7, characterized in that, The manufacturing method of the layered carbon nanotube aluminum-based composite material plate includes: mixing and ball milling carbon nanotubes and aluminum alloy powder to obtain carbon nanotube aluminum alloy sheet material; oriented arranging the sheet material under uniaxial stress to obtain an ordered initial layered composite material; and then performing subsequent densification processes such as vacuum hot pressing, hot forging, and hot rolling to obtain a carbon nanotube aluminum alloy block with a layered microstructure; cutting the pressed block into 20*20mm sizes as a cell and arranging them in a staggered manner.

9. A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell according to claim 8, characterized in that, The ultra-high molecular weight polyethylene fiberboard is made by preparing polyethylene fibers using polyethylene granules, and then hot-pressing it using multi-layer high molecular weight polyethylene non-woven fabric.

10. A method for manufacturing a lightweight armored protective target structure based on a biomimetic tortoise shell according to claim 9, characterized in that, The manufacturing method of the graphene-aluminum-based composite core plate includes: mixing and ball milling graphene and aluminum alloy to obtain graphene-aluminum-based composite powder; using the graphene-aluminum-based composite powder as raw material; inputting the STL format file of the G-type three-period minimal curved surface thin sheet structure into a 3D printer for 3D printing; and printing the G-type curved surface graphene-aluminum-based composite core plate.

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