Bionic double-diagonal reinforced composite armor for ship explosion resistance as well as preparation method and application of bionic double-diagonal reinforced composite armor

Abstract

The invention discloses a bionic double-diagonal reinforced composite armor for ship explosion resistance and a preparation method and application of the bionic double-diagonal reinforced composite armor, and relates to the technical field of impact protection equipment.The bionic double-diagonal reinforced core layer is modeled, prepared and post-treated, and the surface of the bionic double-diagonal reinforced core layer is covered with a composite armor outer plate and a composite armor inner plate; and the bionic double-diagonal reinforced composite armor is formed through combination. The bionic double-diagonal reinforced composite armor has the advantages of being high in anti-explosion impact capacity, high in energy absorption performance, high in designability, convenient to prepare and the like, and has wide application prospects in the field of anti-explosion impact protection of naval vessels and in the fields of transportation, nuclear power equipment and multiple non-contact explosion protection.

Description

Technical Field

[0001] The present invention relates to the technical field of impact protection equipment, and particularly relates to a bionic double diagonal reinforced composite armor for ship anti-explosion, and a preparation method and application thereof. Background Art

[0002] In recent years, the rapid development and growth of China's naval strength have led to the successive commissioning of various new types of ships, including aircraft carriers and amphibious assault ships, marking a significant improvement in naval equipment. At the same time, various types of anti-ship weapons, such as anti-ship missiles, depth charges, and torpedoes, have been continuously iterated and upgraded in various countries, with the damage power and strike accuracy of warheads increasing day by day, posing a serious threat to the vitality and combat effectiveness of ships. Therefore, the research on ship armor protection is particularly important.

[0003] The development of ship armor has experienced a long history, gradually evolving from the initially thick and solid homogeneous armor to the modern lightweight and efficient composite armor structure. Modern ship composite armor usually consists of upper and lower thin panels and a lightweight porous core layer. Under the action of explosive loads, the core layer structure consumes impact energy through its own stable plastic deformation, alleviating the damage to the internal structure caused by the explosive load. Common core layer structures include foam materials, truss structures, corrugated structures, honeycomb structures, etc. Its structural form is closely related to the anti-explosion protection effect of the composite armor, and has also become the key point for further improving the anti-explosion energy absorption effect of the composite armor.

[0004] Learning from nature and drawing inspiration from biological structures, bionic design has become an important method for developing new lightweight and efficient energy absorption structures in recent years. Facing different living environments, organisms in nature have evolved various material / structure systems with different forms. By studying these unique biological materials, artificial multi-cell materials with excellent performance can be designed. Recently, a deep-sea glass sponge called "Euplectella aspergillum" has attracted extensive attention from researchers. Its unique skeletal structure and special mechanical properties enable it to resist extreme loads at depths of more than 6,000 meters. The basic structural cell of this deep-sea glass sponge consists of four square lattices, and a unique double diagonal reinforcement structure is embedded inside the lattice. Existing research shows that the bionic double diagonal reinforcement structure has significant improvements in elastic modulus, buckling strength, bending stiffness, and energy absorption compared with the traditional honeycomb lattice structure, and has great application potential in structural crashworthiness. Therefore, arranging this bionic core layer in the composite armor sandwich structure and using it to withstand explosive impact loads has important practical significance and broad engineering application prospects. Summary of the Invention

[0005] The object of the present invention is to provide a bionic double diagonal enhanced composite armor for ship anti-explosion, its preparation method and application. The bionic double diagonal structure inspired by the deep-sea glass sponge structure is used as the core layer, and combined with the inner and outer panels to form an enhanced composite armor plate structure to resist external explosion shock loads and protect the safety of ship internal equipment and personnel.

[0006] The present invention discloses a preparation method of a bionic double diagonal enhanced composite armor for ship anti-explosion, comprising the following steps:

[0007] S1. Modeling of the bionic double diagonal enhanced core layer: Using computer modeling software to construct bionic double diagonal enhanced cells with required dimensions and structural characteristic parameters, and establishing the corresponding three-dimensional geometric model;

[0008] S2. Preparation of the bionic double diagonal enhanced core layer: Converting the established three-dimensional geometric model into an STL format file, and then importing it into a 3D printer for preparation using selective laser melting technology; during the selective laser melting process, the diameter of the metal powder is 15 - 53 μm, the laser power is 200 - 300 W, the scanning speed is 800 - 1300 mm / s, and the scanning spacing is 30 - 80 μm;

[0009] S3. Post-treatment of the bionic double diagonal enhanced core layer: Sandblasting the printed core layer cells, and then heat-treating the structure to improve the toughness and strength of the core layer structure;

[0010] S4. Preparing the composite armor inner plate and the composite armor outer plate by cutting from the integrally rolled metal plate;

[0011] S5. Connecting the composite armor inner plate, the bionic double diagonal enhanced core layer and the composite armor outer plate by laser welding or gluing to obtain the bionic double diagonal enhanced composite armor.

[0012] Preferably, in step S1, the bionic double diagonal enhanced cell is formed by the interweaving of a square grid frame and a diagonal grid, and the structural characteristic parameters of the bionic double diagonal enhanced cell structure include cell size, number of array cells, wall thickness of the square grid frame, wall thickness of the diagonal grid, diagonal grid spacing, diagonal grid angle and diagonal core layer thickness;

[0013] Among them, the cell size is 30×30 mm, 37.5×37.5 mm or 45×45 mm; the wall thickness of the square grid frame and the wall thickness of the diagonal grid are 1 mm - 3 mm; the diagonal grid angle is 15° - 75°; the ratio of the diagonal grid spacing to the length of the cell size is 1:(4 - 10); the diagonal core layer thickness is 5 - 15 mm.

[0014] Preferably, the number of array cells is 3×3, 4×4, 5×5, 6×6, 7×7 or 8×8.

[0015] Preferably, the materials of the bionic double diagonal enhanced core layer, the inner composite armor plate and the outer composite armor plate are any one of 921A steel, 923A steel, 925A steel, 5A30 aluminum alloy, 7A19 aluminum alloy or 2024 aluminum alloy.

[0016] Preferably, in step S3, the sandblasting material is 40-mesh quartz sand, the sandblasting pressure is 0.5 MPa, the sandblasting distance is 120 - 180 mm, the sandblasting angle is greater than or equal to 45°, and the sandblasting time for 5A30 aluminum alloy, 7A19 aluminum alloy or 2024 aluminum alloy is 20 ± 5 s / 15 cm 2 , and the sandblasting time for 921A steel, 923A steel or 925A steel is 45 ± 5 s / 15 cm 2 ; the heat treatment conditions are a temperature of 800 ± 10 °C and a time of 1.5 - 3 h.

[0017] Preferably, both the inner composite armor plate and the outer composite armor plate are homogeneous solid solid plates.

[0018] Preferably, the thicknesses of both the inner composite armor plate and the outer composite armor plate are 1 - 3 mm, the thickness of the bionic double diagonal enhanced core layer is 5 - 15 mm, and the thickness ratio of the inner composite armor plate or the outer composite armor plate to the core layer is 1:(5 - 15).

[0019] Preferably, in step S5, the laser welding power is 2 - 2.5 kW, and the laser energy density is 700 - 1300 J / mm 2 , and adhesive bonding is carried out using an adhesive, and the type of the adhesive is any one of epoxy adhesives, polyurethane adhesives, and rubber adhesives.

[0020] The present invention also provides the bionic double diagonal enhanced composite armor prepared by the above preparation method. This bionic double diagonal enhanced composite armor is used to enhance the anti-explosion protection ability of ships.

[0021] Therefore, by adopting the above bionic double diagonal enhanced composite armor for ship anti-explosion, its preparation method and application, the present invention has the following beneficial effects:

[0022] 1. Inspired by the skeletal structure of deep - sea glass sponges in nature, the present invention designs a bionic double - diagonal reinforcement structure as the core cell of a composite armor for the explosion - shock protection of ships, protecting the safety of internal personnel and equipment. The bionic double - diagonal structure is a lattice multi - cell structure, which reduces the weight by about 93.3% compared with the traditional uniform armor structure. In addition, due to its unique structural form, the bionic double - diagonal reinforced composite armor can absorb energy more fully after withstanding the explosion - shock load and has better anti - buckling and anti - deformation capabilities. Case analysis shows that under simulated explosion loading, the ability of the present invention to resist deformation is improved by about 158.7% compared with the traditional truss - type composite armor and by about 39.8% compared with the honeycomb - type composite armor, demonstrating excellent performance.

[0023] 2. In the preparation method disclosed by the present invention, the bionic double - diagonal reinforced core layer can be adjusted through geometric characteristic parameters to meet different requirements of the armor core layer, with great design flexibility and optimization space. In addition, the core layer is rapidly prototyped by 3D printing technology, simplifying the preparation steps of the bionic multi - cell structure of the core layer and greatly saving the labor and time costs of preparation.

[0024] 3. The design and preparation method of a bionic double - diagonal reinforced composite armor proposed by the present invention has the advantages of strong anti - explosion - shock ability, high energy - absorption performance, strong designability, and convenient preparation. It has broad application prospects not only in the field of ship anti - explosion - shock protection but also in transportation, nuclear power equipment, and many non - contact explosion - protection fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the preparation flow chart of a bionic double - diagonal reinforced composite armor of the present invention;

[0026] Figure 2 is the schematic diagram of the core layer design of a bionic double - diagonal reinforced composite armor of the present invention;

[0027] Figure 3 is the schematic diagram of a bionic double - diagonal reinforced composite armor of the present invention; where a is the explosion view, b is the axonometric view, and c is the front view;

[0028] Figure 4 is the schematic diagram of the 3D - printed core cell in the embodiment of the present invention;

[0029] Figure 5 is the schematic diagram of the analysis of the explosion simulation embodiment of the bionic double - diagonal reinforced composite armor of the present invention;

[0030] Figure 6 is the comparison chart of the analysis results of the explosion simulation embodiments of three ship composite armors in the present invention;

[0031] Reference Signs:

[0032] 1 - Composite armor outer plate, 2 - Connection between the composite armor outer plate and the core layer, 3 - Bionic double - diagonal reinforced core layer, 4 - Connection between the composite armor inner plate and the core layer, 5 - Composite armor inner plate, L - Unit cell size, T a - Wall thickness of the grid frame, T b - Wall thickness of the diagonal grid, D - Diagonal grid spacing, θ - Diagonal grid angle, W - Thickness of the diagonal core layer. Specific embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will combine the accompanying drawings in the embodiments of the present invention Figures 1 to 6 to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "periphery", "horizontal", "vertical", "length", "thickness", "angle", "upper", "lower", "left", "right", etc., indicating orientations or positions are only for simplifying the description of the present invention, rather than specific positions or orientations. The above - mentioned terms do not limit the present invention.

[0035] The design inspiration of the composite armor core - layer unit cell comes from the microscopic structure of the skeleton of deep - sea glass sponges. Using an optical microscope at a magnification of 500 times, a clear microscopic structure of the sponge skeleton can be observed as Figure 2 shown. The sponge skeleton consists of a periodic array of similar unit cells, which are formed by the interweaving of a square grid (red lines) and a diagonal grid (blue lines), forming a unique double - diagonal reinforcement structure.

[0036] Based on the above, the present invention discloses a preparation method for a bionic double - diagonal reinforced composite armor for ship anti - explosion, as Figure 1 shown. First, based on the deep - sea glass sponge skeleton structure, bionic design is carried out, and the modeling of the bionic double - diagonal reinforced core layer 3 is completed in 3D modeling software; then, the bionic double - diagonal reinforced core layer 3 structure is integrally prepared by metal 3D printing technology, and post - treatments such as sandblasting and heat treatment are carried out on it; then, the composite armor outer plate 1 and the composite armor inner plate 5 are respectively prepared by cutting solid plates; finally, the connection 2 between the composite armor outer plate and the core layer and the connection 4 between the inner plate and the core layer are respectively realized by laser welding or gluing to obtain the bionic double - diagonal reinforced composite armor. The specific steps are as follows:

[0037] S1. Modeling of the bionic double diagonal reinforced core layer: Based on the observed deep-sea sponge bone structure, the main characteristics of the sponge bone structure are simulated, including the square grid and the diagonal grid. A planar model of the bionic double diagonal reinforced structure is established in 3D modeling software. Subsequently, the stretched planar model is used to obtain 3D cells, and the geometric model of the bionic double diagonal reinforced core layer 3 is obtained by in-plane direction array; the 3D modeling software includes but is not limited to Solidworks, Catia, and AUTOCAD.

[0038] S2. Preparation of the bionic double diagonal reinforced core layer: The established 3D geometric model is converted into an STL format file, and then imported into a 3D printer for preparation using selective laser melting technology; during the selective laser melting process, the diameter of the metal powder is 15 - 53 μm, the laser power is 200 - 300 W, the scanning speed is 800 - 1300 mm / s, and the scanning spacing is 30 - 80 μm.

[0039] S3. Post-processing of the bionic double diagonal reinforced core layer: The printed core layer cells are sandblasted, and then the structure is heat-treated to improve the toughness and strength of the core layer structure.

[0040] S4. Prepare the inner composite armor plate 5 and the outer composite armor plate 1 by cutting from the integrally rolled metal plate;

[0041] S5. Connect the inner composite armor plate 5, the bionic double diagonal reinforced core layer 3, and the outer composite armor plate 1 by laser welding or gluing to obtain the bionic double diagonal reinforced composite armor.

[0042] In step S1, the bionic double diagonal reinforced cell is formed by the interweaving of the square grid frame and the diagonal grid. The cell structure characteristic parameters of the bionic double diagonal reinforced structure include cell size, number of array cells, wall thickness of the square grid frame, wall thickness of the diagonal grid, diagonal grid spacing, diagonal grid angle, and diagonal core layer thickness;

[0043] Among them, the bionic double diagonal reinforced structure cell is a completely symmetric square cell, and the cell size L is 30×30 mm, 37.5×37.5 mm, or 45×45 mm; the wall thickness T a of the square grid frame and the wall thickness T b of the diagonal grid are 1 mm - 3 mm; the diagonal grid angle θ is 15° - 75°; the ratio of the diagonal grid spacing D to the length of the cell size L is 1:(4 - 10), and the diagonal core layer thickness W is 5 - 15 mm. In the present invention, the preferred number of array cells is 3×3, 4×4, 5×5, 6×6, 7×7, or 8×8.

[0044] The materials of the bionic double diagonal enhanced core layer 3, the inner composite armor plate 5 and the outer composite armor plate 1 are any one of 921A steel, 923A steel, 925A steel, 5A30 aluminum alloy, 7A19 aluminum alloy or 2024 aluminum alloy.

[0045] In step S3, the sandblasting material is 40-mesh quartz sand, the sandblasting pressure is 0.5 MPa, the sandblasting distance is 120 - 180 mm, the sandblasting angle is greater than or equal to 45°, and the sandblasting time for 5A30 aluminum alloy, 7A

[19] aluminum alloy or 2024 aluminum alloy is 20 ± 5 s / 15 cm 2 , and the sandblasting time for 921A steel, 923A steel or 925A steel is 45 ± 5 s / 15 cm 2 ; the heat treatment conditions are a temperature of 800 ± 10 °C and a time of 1.5 - 3 h.

[0046] Both the inner composite armor plate 5 and the outer composite armor plate 1 are homogeneous solid solid plates.

[0047] The thicknesses of both the inner composite armor plate 5 and the outer composite armor plate 1 are 1 - 3 mm, the thickness of the bionic double diagonal enhanced core layer 3 is 5 - 15 mm, and the ratio of the thickness of the inner composite armor plate 5 or the outer composite armor plate 1 to the core layer thickness 3 is 1:(5 - 15).

[0048] In step S5, the laser welding power is 2 - 2.5 kW, and the laser energy density is 700 - 1300 J / mm 2 , and adhesive bonding is carried out using an adhesive. The type of the adhesive is any one of epoxy adhesives, polyurethane adhesives, and rubber adhesives.

[0049] Example 1

[0050] This example provides a preparation method for a bionic double diagonal enhanced core layer:

[0051] In the present invention, inspired by the microstructure of the skeleton of deep-sea glass sponges, a two-dimensional plane sketch of a bionic double diagonal enhanced cell is drawn using the three-dimensional modeling software Solidworks. As an implementation, the cell size L is 37.5 × 37.5 mm, and the wall thickness (including the wall thickness T of the square a and the wall thickness T of the diagonal grid b ) is 1 mm, the diagonal grid spacing D is 6.25 mm, and the diagonal grid angle θ is 45°; subsequently, the sketch is stretched in the out-of-plane direction to obtain a three-dimensional cell model of a bionic double diagonal enhanced cell with a diagonal core layer thickness W of 15 mm; finally, the obtained cells are arrayed in the plane to obtain a three-dimensional geometric model of the bionic double diagonal enhanced core layer 3 containing 4 × 4 cells, with an overall size of 150 × 150 × 15 mm.

[0052] It should be noted that in the original text, "7A

[19] " seems to be an incorrect expression. It is retained as it is in the translation for the purpose of maintaining consistency with the original. You may need to check and correct it in the source material if necessary.Convert the above three-dimensional geometric model into an STL format file, import it into a metal 3D printer, and prepare it by selective laser melting technology using 921A steel powder;

[0053] In the present invention, the average diameter of the 921A steel powder is about 50 μm, and it includes the following chemical components by mass percentage: C 0.07 - 0.14%, Si 0.17 - 0.37%, Mn 0.30 - 0.60%, P 0.020%, S 0.015%, Ni 2.60 - 3.00%, Cr 0.90 - 1.20%, and the balance Fe.

[0054] In the embodiment, the prepared bionic double diagonal enhanced core layer 3 is as Figure 4 shown;

[0055] As Figure 4 can be seen, the cell hole characteristics of the bionic double diagonal enhanced core layer prepared by 3D printing are obvious, the surface is smooth and continuous, and the overall material is dense and defect-free.

[0056] Anti-explosion simulation analysis of the bionic double diagonal enhanced composite armor (Example 2):

[0057] Based on the bionic double diagonal enhanced core layer 3 model in Example 1, two plates with dimensions of 150×150×1 mm are respectively established in the 3D modeling software Solidworks as the outer plate 1 and the inner plate 5 of the bionic double diagonal enhanced composite armor for ship anti-explosion, and are connected to the core layer 3 through Boolean operation to obtain a complete three-dimensional geometric model of the bionic double diagonal enhanced composite armor, and its schematic diagram is as Figure 3 shown.

[0058] Subsequently, the established geometric model is imported into the finite element analysis software Abaqus, meshed with C3D8R hexahedron elements, and the bionic double diagonal enhanced composite armor material properties are given by using an ideal rigid-plastic model.

[0059] In the embodiment, the basic mechanical properties of the 921A steel include: density 7800 kg / m 3 , Young's modulus 210 GPa, yield strength 680 MPa;

[0060] The boundary conditions for the simulated explosion loading of the prepared bionic double diagonal enhanced composite armor are as Figure 5 shown, where the bionic double diagonal enhanced composite armor plate is fixed at all four sides, and the simulated explosion causes the outer plate 1 of the composite armor to bear a uniformly distributed pressure load.

[0061] The pressure values generated by typical non-contact weapon explosions range from 100 to 500 MPa, and the action time of the load peak varies from 0.1 to 0.5 ms. In this embodiment, considering the ultimate bearing situation, the working conditions analyzed are loading peaks of 300 MPa, 500 MPa, and 800 MPa, and the loading time is 0.1 ms for all cases.

[0062] The anti-explosion effect of the bionic double diagonal enhanced composite armor in the embodiment is as Figure 6 shown. In the figure, anti-explosion simulation analyses of honeycomb composite armor and grid composite armor with the same mass are carried out simultaneously.

[0063] Figure 6 The results in [reference] show that under the pressure loadings of 300 MPa, 500 MPa, and 800 MPa, the maximum deformation amounts in the bionic double diagonal enhanced composite armor are 0.76 mm, 1.33 mm, and 2.25 mm respectively.

[0064] Under the 800 MPa pressure loading, the maximum deformation amounts of the bionic double diagonal enhanced composite armor, honeycomb composite armor, and grid composite armor are 2.25 mm, 3.15 mm, and 5.82 mm respectively; the deformation amount of the bionic double diagonal enhanced composite armor is reduced by 39.8% and 158.7% respectively compared with the honeycomb composite armor and the grid composite armor; thus, it can be seen that the bionic double diagonal enhanced composite armor prepared by the present invention exhibits excellent protective performance and can significantly enhance the anti-explosion protection ability of ships.

[0065] Therefore, the present invention discloses a bionic double diagonal enhanced composite armor for ship anti-explosion, its preparation method and application, which have the advantages of strong anti-explosion impact ability, high energy absorption performance, strong designability, and convenient preparation. It has broad application prospects not only in the field of ship anti-explosion impact protection, but also in the fields of transportation, nuclear power equipment, and many non-contact explosion protection fields.

[0066] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and do not limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation method of a bionic double-diagonal enhanced composite armor for ship anti-explosion, characterized in that It includes the following steps: S1. Modeling of the bionic double diagonal enhanced core layer: Use computer modeling software to construct bionic double diagonal enhanced cells with required dimensions and structural characteristic parameters. Obtain the bionic double diagonal enhanced core layer by arranging the bionic diagonal enhanced cells in a periodic array, and establish the corresponding three-dimensional geometric model; S2. Preparation of the bionic double diagonal enhanced core layer: Convert the established three-dimensional geometric model into an STL format file, and then import it into a 3D printer for preparation using selective laser melting technology; during the selective laser melting process, the diameter of the metal powder is 15 - 53 μm, the laser power is 200 - 300 W, the scanning speed is 800 - 1300 mm / s, and the scanning spacing is 30 - 80 μm; S3. Post-processing of the bionic double diagonal enhanced core layer: Perform sandblasting on the printed core layer cells, and then perform heat treatment on the structure to improve the toughness and strength of the core layer structure; S4. Prepare the inner composite armor plate and the outer composite armor plate by cutting from an integrally rolled metal plate; S5. Connect the inner composite armor plate, the bionic double diagonal enhanced core layer and the outer composite armor plate by laser welding or gluing to obtain the bionic double diagonal enhanced composite armor.

2. The preparation method of a bionic double diagonal enhanced composite armor for ship anti-explosion according to claim 1, characterized in that, In step S1, the bionic double diagonal enhanced cell is composed of an interwoven grid frame and diagonal grids. The structural characteristic parameters of the bionic double diagonal enhanced structural cell include cell size, number of array cells, grid frame wall thickness, diagonal grid wall thickness, diagonal grid spacing, diagonal grid angle, and diagonal core layer thickness; Among them, the cell size is 30×30 mm, 37.5×37.5 mm, or 45×45 mm; the grid frame wall thickness and the diagonal grid wall thickness are 1 mm - 3 mm; the diagonal grid angle is 15° - 75°; the ratio of the diagonal grid spacing to the length of the cell size is 1:(4 - 10), and the diagonal core layer thickness is 5 - 15 mm.

3. The preparation method of a bionic double diagonal reinforced composite armor for ship blast resistance according to claim 2, wherein The number of array cells is 3×3, 4×4, 5×5, 6×6, 7×7, or 8×8.

4. The preparation method of a bionic double diagonal enhanced composite armor for ship anti-explosion according to claim 1, characterized in that, The materials of the bionic double diagonal enhanced core layer, the inner composite armor plate and the outer composite armor plate are any one of 921A steel, 923A steel, 925A steel, 5A30 aluminum alloy, 7A19 aluminum alloy, or 2024 aluminum alloy.

5. The preparation method of a bionic double diagonal enhanced composite armor for anti-explosion of naval ships according to claim 4, characterized in that, In step S3, the sandblasting material is 40-mesh quartz sand, the sandblasting pressure is 0.5 MPa, the sandblasting distance is 120 - 180 mm, the sandblasting angle is greater than or equal to 45°, and the sandblasting time for 5A30 aluminum alloy, 7A19 aluminum alloy or 2024 aluminum alloy is 20 ± 5 s / 15 cm 2 , and the sandblasting time for 921A steel, 923A steel or 925A steel is 45 ± 5 s / 15 cm 2 ; the heat treatment conditions are a temperature of 800 ± 10 °C and a time of 1.5 - 3 h.

6. The preparation method of a bionic double diagonal enhanced composite armor for ship anti-explosion according to claim 1, characterized in that Both the inner composite armor plate and the outer composite armor plate are homogeneous solid solid plates.

7. The preparation method of a bionic double diagonal enhanced composite armor for ship anti-explosion according to claim 1, characterized in that, The thicknesses of both the inner composite armor plate and the outer composite armor plate are 1 - 3 mm, the thickness of the bionic double diagonal enhanced core layer is 5 - 15 mm, and the thickness ratio of the inner composite armor plate or the outer composite armor plate to the bionic double diagonal enhanced core layer is 1:(5 - 15).

8. The preparation method of a bionic double diagonal reinforced composite armor for ship anti-explosion according to claim 1, characterized in that In step S5, the laser welding power is 2 - 2.5 kW, and the laser energy density is 700 - 1300 J / mm 2 , and adhesive bonding is carried out using an adhesive, and the type of the adhesive is any one of epoxy adhesives, polyurethane adhesives, and rubber adhesives.

9. A bionic double diagonal reinforced composite armor for ship blast resistance, characterized in that, The bionic double diagonal enhanced composite armor is prepared by the preparation method described in any one of claims 1 - 8.

10. The application of a bionic double diagonal enhanced composite armor for anti-explosion of naval ships according to claim 9, characterized in that, The bionic double diagonal enhanced composite armor is used to enhance the anti-explosion protection ability of ships.

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