Deep-sea explosion-suppression impact-resistant composite pressure-resistant structure and design method thereof

Abstract

The invention provides a deep-sea explosion-suppression impact-resistant composite pressure-resistant structure and a design method thereof. The deep-sea explosion-suppression impact-resistant composite pressure-resistant structure comprises a ceramic pressure-resistant structure, a titanium alloy pressure-resistant structure and a carbon fiber pressure-resistant structure, the titanium alloy pressure-resistant structure wraps the outer surface of the ceramic pressure-resistant structure, and the carbon fiber pressure-resistant structure wraps the outer surface of the titanium alloy pressure-resistant structure. The three layers are matched to form a ceramic-titanium alloy-carbon fiber three-layer composite pressure-resistant structure. By adopting the design of a ceramic-titanium alloy-carbon fiber three-layer composite pressure-resistant structure, the defect that a single material and a traditional ceramic-carbon fiber brittle composite structure are difficult to give consideration to multiple properties is overcome by utilizing the performance complementation of high pressure resistance of the inner-layer ceramic, high impact resistance of the middle-layer titanium alloy and high tensile strength and light weight of the outer-layer carbon fiber; the double purposes of high deep-sea high-pressure bearing capacity and excellent explosion suppression and impact resistance are achieved.

Description

Technical Field

[0001] This invention relates to the field of deep-sea pressure-resistant structure design technology, specifically to a deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure and its design method. More particularly, it relates to a deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure and its design method. Background Technology

[0002] The pressure-resistant structure is one of the core components of a deep-sea submersible, directly determining its diving depth and playing a crucial role in ensuring the safety of all personnel. However, the design of deep-sea pressure-resistant structures must balance multiple performance aspects, including high strength, corrosion resistance, impact resistance, and lightweight. Currently, most deep-sea pressure-resistant structures are manufactured using a single material, making it difficult to simultaneously meet the requirements of these diverse performance characteristics. Therefore, the field has begun to consider using a combination of multiple material layers to design deep-sea composite pressure-resistant structures. Existing patent documents with publication numbers CN117465640A and CN120408839 disclose a composite spherical pressure-resistant structure formed by combining ceramic spheres and carbon fiber. However, since both ceramic and carbon fiber are brittle materials, once damaged, the pressure-resistant structure will completely collapse and implode, failing to solve the problem of simultaneously possessing strong pressure-bearing capacity and excellent explosion-proof and impact-resistant performance.

[0003] Patent document CN110466723B discloses an energy-absorbing protective structure for a hollow ceramic buoyancy sphere and its preparation method. This structure includes a spherical shell made of ultra-high molecular weight polyethylene fiber material, which is disposed on the surface of the hollow ceramic buoyancy sphere. This solution uses ultra-high molecular weight polyethylene as the energy-absorbing protective material, which can prevent the hollow ceramic buoyancy sphere from being damaged by impact during handling and installation, and can also effectively absorb the enormous energy released when the hollow ceramic buoyancy sphere implodes in the deep sea. However, this solution does not employ a ceramic-titanium alloy-carbon fiber composite layer structure, and is still a deep-sea pressure-resistant structure made of a single material, making it difficult to simultaneously meet the performance requirements of high strength, corrosion resistance, impact resistance, and lightweight.

[0004] Therefore, it is necessary to propose a deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure. This structure should possess both strong pressure-bearing capacity and tensile strength, high strength and toughness, and lightweight design while ensuring safety. Ultimately, it should achieve multiple benefits, including strong high-pressure load-bearing capacity and excellent explosion-suppressing and impact-resistant performance. Furthermore, a new design method is needed for this composite pressure-resistant structure. This method should comprehensively consider the effects of deep-sea hydrostatic pressure, safety factor, and external transient high-pressure impact loads. A neural network algorithm should be used for the lightweight and impact-resistant design of the composite pressure-resistant structure, ultimately resulting in a lightweight, high-strength composite pressure-resistant structure with excellent explosion-suppressing and impact-resistant performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure and its design method.

[0006] The present invention provides a deep-sea explosion-proof and impact-resistant composite pressure-resistant structure, comprising: a ceramic pressure-resistant structure, a titanium alloy pressure-resistant structure, and a carbon fiber pressure-resistant structure. The titanium alloy pressure-resistant structure covers the outer surface of the ceramic pressure-resistant structure, and the carbon fiber pressure-resistant structure covers the outer surface of the titanium alloy pressure-resistant structure. The three together form a ceramic-titanium alloy-carbon fiber three-layer composite pressure-resistant structure.

[0007] Preferably, the ceramic pressure-resistant structure, the titanium alloy pressure-resistant structure, and the carbon fiber pressure-resistant structure are spherical shell structures, forming ceramic pressure-resistant spherical shells, titanium alloy pressure-resistant spherical shells, and carbon fiber pressure-resistant spherical shells, respectively, with the titanium alloy pressure-resistant spherical shell and the ceramic pressure-resistant spherical shell being completely bonded together, and the carbon fiber pressure-resistant spherical shell and the titanium alloy pressure-resistant spherical shell being completely bonded together.

[0008] Preferably, the wall thickness t1 of the ceramic pressure-resistant spherical shell satisfies:

[0009] in, R1 is the radius of the inner wall of the ceramic pressure-resistant spherical shell; E1 is the elastic modulus of the ceramic used in the ceramic pressure spherical shell; μ1 is the Poisson's ratio of the ceramic used in the ceramic pressure spherical shell; n1 is the safety factor of the ceramic pressure-resistant spherical shell; and,

[0010] in, ρ The density of seawater, g It is the acceleration due to gravity. h This refers to the diving depth.

[0011] Preferably, the wall thickness t2 of the titanium alloy pressure spherical shell satisfies:

[0012] in, R 2 represents the radius of the inner wall of the titanium alloy pressure-resistant spherical shell; E 2 represents the elastic modulus of the titanium alloy used in the titanium alloy pressure spherical shell; μ 2 represents the Poisson's ratio of the titanium alloy used in the titanium alloy pressure spherical shell; n2 is the safety factor of the titanium alloy pressure-resistant spherical shell; P d2 This is for the external transient high-pressure impact load borne by the titanium alloy pressure spherical shell.

[0013] Preferably, the wall thickness t3 of the carbon fiber pressure-resistant spherical shell satisfies:

[0014] in, R3 is the radius of the inner wall of the carbon fiber pressure-resistant spherical shell; E3 is the elastic modulus of the carbon fiber used in the carbon fiber pressure spherical shell; μ3 is the Poisson's ratio of the carbon fiber used in the carbon fiber pressure spherical shell; n3 is the safety factor of the carbon fiber pressure-resistant spherical shell; P d3 This refers to the external transient high-pressure impact load that the carbon fiber pressure-resistant spherical shell can withstand.

[0015] Preferably, the critical collapse load P of the carbon fiber pressure-resistant spherical shell cr,3 satisfy:

[0016] Where, p water For the hydrostatic pressure in the deep sea, from the formula p water =ρgh is calculated, where ρ is the density of seawater, g is the acceleration due to gravity, and h is the diving depth.

[0017] According to the present invention, a design method for a deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure is provided, which is used in the aforementioned deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure, comprising the following steps: S1: Determine the thickness t1 of the ceramic pressure-resistant structure based on the deep-sea hydrostatic pressure load; S2: Considering external transient high-pressure impact loads, determine the thickness t2 of the titanium alloy pressure-resistant structure; S3: Considering external transient high-pressure impact loads, determine the thickness t3 of the carbon fiber pressure-resistant structure; S4: Optimize the design with the thickness of the ceramic, titanium alloy and carbon fiber layers as design variables, and with the goal of minimizing mass and minimum implosion impact load. S5: An orthogonal experimental combination table is established using the deep-sea implosion fluid-structure interaction numerical method, and the optimal design variables are output; S6: Conduct fluid-structure interaction analysis of the implosion-resistant and impact-resistant composite pressure-resistant structure of deep-sea ceramic-titanium alloy-carbon fiber under impact load to verify its explosion suppression and impact resistance performance.

[0018] Preferably, in step S1, when determining the thickness t1 of the ceramic pressure-resistant spherical shell, it is necessary to first use the formula... The critical collapse load P of the ceramic pressure-resistant spherical shell is obtained by calculating the deep-sea hydrostatic pressure and then using the formula for the critical collapse load of the pressure-resistant structure under deep-sea hydrostatic pressure. cr,1 ,

[0019] In the formula, R1 is the radius of the inner wall of the ceramic pressure-resistant spherical shell, E1 is the elastic modulus of the ceramic material used, and μ1 is the Poisson's ratio of the ceramic material used. And satisfy

[0020] In the formula, n 1 represents the safety factor for the ceramic pressure-resistant structure; Finally, the wall thickness t1 of the ceramic pressure-resistant structure is obtained based on the calculation formula of the brittle thin-walled pressure-resistant structure.

[0021] Preferably, in step S5, when establishing the orthogonal test combination table, the values ​​of the ceramic pressure-resistant structure thickness t1, the titanium alloy pressure-resistant structure thickness t2, and the carbon fiber pressure-resistant structure thickness t3 are changed sequentially, and the total mass and the implosion impact load that the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure can withstand under different thickness ratios are calculated. The data in the orthogonal test combination table are trained into a surrogate model using a neural network algorithm. Based on the surrogate model, the optimal design variables t1, t2, and t3 are output to minimize the total mass and maximize the implosion impact load that can be withstood.

[0022] Preferably, in step S4, the total mass m of the composite pressure-resistant structure is calculated using the mass equations for each layer of ceramic, titanium alloy, and carbon fiber:

[0023] m1 is the mass of the ceramic pressure-resistant spherical shell, and ρ1 is the density of the ceramic used in the ceramic pressure-resistant spherical shell; m2 is the mass of the titanium alloy pressure spherical shell, and ρ2 is the density of the titanium alloy used in the titanium alloy pressure spherical shell. m3 is the mass of the carbon fiber pressure spherical shell, and ρ3 is the density of the carbon fiber used in the carbon fiber pressure spherical shell. An implosion shock wave monitoring point was set up at a distance L from the outer surface of the composite pressure-resistant structure. The implosion shock wave pressure P at the monitoring point was calculated using a deep-sea implosion fluid-structure interaction numerical method. shock , with P shock Minimum is used as the criterion for determining the minimum implosion impact load.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention adopts a three-layer composite pressure-resistant structure design of ceramic-titanium alloy-carbon fiber, which utilizes the complementary properties of the inner ceramic layer with high compressive strength, the middle titanium alloy layer with high impact resistance, and the outer carbon fiber layer with high tensile strength and lightweight properties. This solves the problem that single materials and traditional ceramic-carbon fiber brittle composite structures cannot achieve multiple properties at the same time, and realizes the dual goals of strong deep-sea high pressure bearing capacity and excellent explosion suppression and impact resistance.

[0025] 2. This invention proposes a design method for the above-mentioned deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure. It comprehensively considers the influence factors of deep-sea hydrostatic pressure, safety factor and external transient high-pressure impact load, and carries out lightweight and impact-resistant design of composite pressure-resistant structure, providing a core basis for the precise design of composite structure.

[0026] 3. This invention determines the thickness of each layer by using multiple load parameters, and takes the minimum mass and minimum impact load as design objectives. It combines fluid-structure interaction numerical results for optimization and verification, and finally clarifies the optimal wall thickness and proportion of each layer of ceramic-titanium alloy-carbon fiber, providing a design method for deep-sea multi-material composite pressure-resistant structures.

[0027] 4. This invention introduces a neural network algorithm for the lightweight and impact-resistant design of composite structures, which improves optimization efficiency compared to traditional design methods, while ensuring that the designed structure has the comprehensive advantages of being lightweight, high-strength, and having excellent explosion-proof and impact-resistant performance. Attached Figure Description

[0028] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the buckling modal displacement of a titanium alloy pressure spherical shell, which is the main feature of this invention. Figure 2 This invention primarily demonstrates the critical collapse load P of the ceramic-titanium alloy composite pressure-resistant structure. cr,2 A schematic diagram; Figure 3 This is a schematic diagram illustrating the buckling modal displacement of a carbon fiber pressure-resistant spherical shell, which is the main feature of this invention. Figure 4 This invention primarily demonstrates the critical collapse load P of the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure. cr,3 A schematic diagram; Figure 5 This is a schematic diagram illustrating the pressure-resistant composite structure of deep-sea ceramics-titanium alloys-carbon fiber, which is the main feature of this invention.

[0029] Figure label: Ceramic pressure-resistant spherical shell 1; titanium alloy pressure-resistant spherical shell 2; carbon fiber pressure-resistant spherical shell 3. Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0031] Example 1 This invention provides a deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure and its design method, mainly including the following steps: Step 1: Determine the thickness t1 of the ceramic pressure-resistant structure based on the deep-sea hydrostatic pressure load; When the pressure-resistant structure operates in a deep-sea environment at a depth of 11,000 meters, it is directly subjected to the high-pressure hydrostatic load of the deep sea. The hydrostatic pressure in the deep sea is:

[0032] In the formula, ρ The density of seawater, g It is the acceleration due to gravity. h This refers to the diving depth.

[0033] Based on the formula for the critical collapse load of pressure-resistant structures under deep-sea hydrostatic pressure, the critical collapse load of ceramic pressure-resistant structures is calculated. P cr,1 Furthermore, the minimum critical collapse load of the pressure-resistant structure should be greater than the environmental pressure corresponding to the diving depth of the deep-sea submersible, that is:

[0034] In the formula, n 1 represents the safety factor for the ceramic pressure-resistant structure.

[0035] Based on the calculation formula for brittle thin-walled pressure-resistant structures, the wall thickness t1 of the ceramic pressure-resistant structure is obtained.

[0036] One optional implementation is that, when the ceramic pressure-resistant structure is a spherical shell, the critical collapse load of the ceramic pressure-resistant spherical shell 1 is calculated as follows:

[0037] In the formula, R1 is the radius of the inner wall of the ceramic pressure-resistant spherical shell 1, E1 is the elastic modulus of the ceramic material used, and μ1 is the Poisson's ratio of the ceramic material used.

[0038] When the inner diameter of the designed ceramic pressure-resistant spherical shell 1 is R1 = 44.2 mm, the elastic modulus of the ceramic material used is E1 = 360 GPa, the Poisson's ratio is μ1 = 0.23, and the safety factor is n1 = 1.0, the wall thickness t1 of the ceramic pressure-resistant spherical shell 1 should satisfy:

[0039] That is, the minimum thickness of the ceramic pressure-resistant spherical shell 1 is t1=0.92 mm.

[0040] Step 2: Based on the safety factor of the ceramic-titanium alloy composite pressure-resistant structure and considering the external transient high-pressure impact load, determine the thickness t2 of the titanium alloy pressure-resistant structure. Considering the external transient high-pressure impact load P d2 The effect of 55 MPa on the pressure resistance of titanium alloy structures was calculated, and the critical collapse load P of the spherical titanium alloy pressure resistance structure was obtained. cr,2 for:

[0041] In the formula, R 2 is the radius of the inner wall of the titanium alloy pressure-resistant spherical shell 2. E 2 represents the elastic modulus of titanium alloy. μ 2 represents the Poisson's ratio for titanium alloys.

[0042] When the safety factor of the designed ceramic-titanium alloy composite pressure-resistant structure n 2=1.25, the inner diameter of the spherical titanium alloy pressure-resistant structure is R 2= R 1+ t 1 = 44.2 + 0.92 = 45.12 mm, elastic modulus E 2 = 114 GPa, Poisson's ratio μ When 2=0.33, the wall thickness t2 of the titanium alloy pressure spherical shell 2 should satisfy:

[0043] That is, the minimum thickness of the spherical titanium alloy pressure-resistant structure is t2=1.28 mm.

[0044] According to the "Classification Code for Diving Systems and Submersibles", buckling modal calculations are performed first, with the modal displacements set at 0.5... %R 2, as an initial structural defect, has the following modal displacement results: Figure 1 As shown.

[0045] The critical collapse load P of the ceramic-titanium alloy composite pressure-resistant structure was calculated using the arc-length method. cr,2 ,like Figure 2 As shown.

[0046] The critical collapse load P of the designed ceramic-titanium alloy composite pressure-resistant structure cr,2 =137.31 MPa, which is greater than the hydrostatic pressure in the deep sea, therefore it meets the usage requirements:

[0047] Step 3: Based on the safety factor of the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure and considering the external transient high-pressure impact load, determine the thickness t3 of the carbon fiber pressure-resistant structure. Considering the external transient high-pressure impact load P d3 The force of 55 MPa on the carbon fiber compression structure is calculated to obtain the critical collapse load P of the carbon fiber compression structure. cr,3 for:

[0048] In the formula, R 3 is the radius of the inner wall of the titanium alloy spherical pressure shell. R 3= R 2+ t 2 = 45.12 + 1.28 = 46.4 mm E 3 represents the elastic modulus of titanium alloy. μ 3 represents the Poisson's ratio for titanium alloys.

[0049] When designing a safety factor for ceramic-titanium alloy-carbon fiber n 3=1.25, the elastic modulus of the carbon fiber used in the carbon fiber pressure-resistant spherical shell 3. E 3 = 13.8 GPa, Poisson's ratio μ When 3=0.3, the wall thickness t3 of the carbon fiber pressure-resistant spherical shell 3 should satisfy:

[0050] That is, the minimum thickness of the spherical carbon fiber pressure-resistant structure is t2 = 1.21 mm.

[0051] According to the "Classification Code for Diving Systems and Submersibles", buckling modal calculations are performed first, with the modal displacements set at 0.5... %R 3, as an initial structural defect, has the following modal displacement results: Figure 3 As shown.

[0052] The critical collapse load P of the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure was calculated using the arc-length method. cr,3 ,like Figure 4 As shown.

[0053] The critical collapse load P of the designed ceramic-titanium alloy-carbon fiber composite pressure-resistant structure cr,3 =349.73 MPa, which is greater than the hydrostatic pressure in the deep sea, therefore it meets the usage requirements:

[0054] A schematic diagram of a deep-sea ceramic-titanium alloy-carbon fiber composite pressure-resistant structure is shown below. Figure 5As shown, the inner ceramic pressure-resistant structure has strong compressive strength, the middle titanium alloy pressure-resistant structure has good impact resistance, and the outer carbon fiber pressure-resistant structure has strong tensile strength. The titanium alloy pressure-resistant structure covers the outer surface of the ceramic pressure-resistant structure, and the carbon fiber pressure-resistant structure covers the outer surface of the titanium alloy pressure-resistant structure. The composite pressure-resistant structure formed by these three elements has multiple functions, including strong deep-sea high-pressure bearing capacity and good explosion suppression and impact resistance. Specifically, the ceramic pressure-resistant structure is a ceramic pressure-resistant spherical shell 1, the titanium alloy pressure-resistant structure is a titanium alloy pressure-resistant spherical shell 2, and the carbon fiber pressure-resistant structure is a carbon fiber pressure-resistant spherical shell 3. The titanium alloy pressure-resistant spherical shell 2 and the ceramic pressure-resistant spherical shell 1 are completely bonded together, and the carbon fiber pressure-resistant spherical shell 3 and the titanium alloy pressure-resistant spherical shell 2 are completely bonded together.

[0055] Step 4: Optimize the design with the thickness of the ceramic, titanium alloy, and carbon fiber layers as design variables, and with the goals of minimizing mass and minimizing implosion impact load. The total mass m of the deep-sea ceramic-titanium alloy-carbon fiber composite pressure-resistant structure is

[0056] In the formula, R1, R2, and R3 are the radii of the inner walls of the ceramic, titanium alloy, and carbon fiber pressure-resistant structures, respectively; m1 is the mass of the ceramic pressure-resistant spherical shell 1, and ρ1 is the density of the ceramic used in the ceramic pressure-resistant spherical shell 1; m2 is the mass of the titanium alloy pressure-resistant spherical shell 2, and ρ2 is the density of the titanium alloy used in the titanium alloy pressure-resistant spherical shell 2; m3 is the mass of the carbon fiber pressure-resistant spherical shell 3, and ρ3 is the density of the carbon fiber used in the carbon fiber pressure-resistant spherical shell 3. To meet the lightweight requirements of the composite pressure-resistant structure, the total mass of the three components should be as small as possible.

[0057] Simultaneously, a monitoring point for the implosion shock wave of a deep-sea ceramic-titanium alloy-carbon fiber composite pressure-resistant structure was set up at a distance L from the outer surface of the composite pressure-resistant structure. The implosion shock wave pressure P at the monitoring point was calculated using a deep-sea implosion fluid-structure interaction numerical method. shock , with P shock As the criterion for determining the minimum implosion impact load, P shock The smaller the value, the better the explosion suppression and impact resistance of the composite structure.

[0058] Step 5: Establish an orthogonal experimental combination table using the deep-sea implosion fluid-structure interaction numerical method, and output the optimal design variables; When establishing an orthogonal test group table using the deep-sea implosion fluid-structure interaction numerical method, the values ​​of t1, t2, and t3 were changed sequentially to calculate the total mass and the implosion impact load that the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure could withstand under different thickness ratios. Then, the data from the orthogonal test group table under different thicknesses were trained using a neural network algorithm to form a surrogate model, and the optimal design variables t1, t2, and t3 were output to minimize the total mass and maximize the implosion impact load that could be withstood.

[0059] Step 6: Conduct fluid-structure interaction analysis of the deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure under impact load to verify its explosion-suppressing and impact-resistant performance.

[0060] This invention determines the thickness of each layer of the composite pressure-resistant structure by considering deep-sea hydrostatic pressure, safety factor, and external transient high-pressure impact load. With minimum mass and minimum impact load as design objectives, optimization and verification are performed using fluid-structure interaction numerical results. The wall thickness and proportion of the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure are presented, providing a design method for multi-material composite pressure-resistant structures in the deep sea. The designed deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure has the advantages of light weight and high strength; it also possesses excellent explosion-suppressing and impact-resistant performance. In summary, the deep-sea ceramic-titanium alloy-carbon fiber explosion-suppressing and impact-resistant composite pressure-resistant structure and its design method combine the strong compressive strength of the inner ceramic pressure-resistant structure, the good impact resistance of the middle titanium alloy pressure-resistant structure, and the strong tensile strength of the outer carbon fiber pressure-resistant structure, achieving multiple benefits of strong deep-sea high-pressure bearing capacity and good explosion-suppressing and impact-resistant performance. The design comprehensively considers the influence of deep-sea hydrostatic pressure, safety factor, and external transient high-pressure impact load, and improves optimization efficiency by using a neural network algorithm for lightweighting and impact-resistant design of the composite pressure-resistant structure.

[0061] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure, characterized in that, include: The structure consists of a ceramic pressure-resistant structure, a titanium alloy pressure-resistant structure, and a carbon fiber pressure-resistant structure. The titanium alloy pressure-resistant structure covers the outer surface of the ceramic pressure-resistant structure, and the carbon fiber pressure-resistant structure covers the outer surface of the titanium alloy pressure-resistant structure. The three together form a three-layer composite pressure-resistant structure of ceramic-titanium alloy-carbon fiber.

2. The deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 1, characterized in that, The ceramic pressure-resistant structure, the titanium alloy pressure-resistant structure and the carbon fiber pressure-resistant structure are spherical shell structures, forming a ceramic pressure-resistant spherical shell (1), a titanium alloy pressure-resistant spherical shell (2) and a carbon fiber pressure-resistant spherical shell (3) respectively. The titanium alloy pressure-resistant spherical shell (2) and the ceramic pressure-resistant spherical shell (1) are completely bonded together, and the carbon fiber pressure-resistant spherical shell (3) and the titanium alloy pressure-resistant spherical shell (2) are completely bonded together.

3. The deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 2, characterized in that, The wall thickness t1 of the ceramic pressure-resistant spherical shell (1) satisfies: in, R1 is the radius of the inner wall of the ceramic pressure-resistant spherical shell (1); E1 is the elastic modulus of the ceramic used in the ceramic pressure-resistant spherical shell (1); μ1 is the Poisson's ratio of the ceramic used in the ceramic pressure spherical shell (1); n1 is the safety factor of the ceramic pressure-resistant spherical shell (1); For deep-sea hydrostatic pressure, in, ρ The density of seawater, g It is the acceleration due to gravity. h This refers to the diving depth.

4. The deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 2, characterized in that, The wall thickness t2 of the titanium alloy pressure spherical shell (2) satisfies: in, R 2 is the radius of the inner wall of the titanium alloy pressure-resistant spherical shell (2); E 2 represents the elastic modulus of the titanium alloy used in the titanium alloy pressure spherical shell (2); μ 2 is the Poisson's ratio of the titanium alloy used in the titanium alloy pressure spherical shell (2); n2 is the safety factor of the titanium alloy pressure spherical shell (2); P d2 The external transient high pressure impact load is borne by the titanium alloy pressure spherical shell (2).

5. The deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 2, characterized in that, The wall thickness t3 of the carbon fiber pressure spherical shell (3) satisfies: in, R3 is the radius of the inner wall of the carbon fiber pressure spherical shell (3); E3 is the elastic modulus of the carbon fiber used in the carbon fiber pressure spherical shell (3); μ3 is the Poisson's ratio of the carbon fiber used in the carbon fiber pressure spherical shell (3); n3 is the safety factor of the carbon fiber pressure spherical shell (3); P d3 The external transient high-pressure impact load is borne by the carbon fiber pressure spherical shell (3).

6. The deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 2, characterized in that, Critical collapse load P of carbon fiber pressure spherical shell (3) cr,3 satisfy: Where, p water For the hydrostatic pressure in the deep sea, from the formula p water =ρgh is calculated, where ρ is the density of seawater, g is the acceleration due to gravity, and h is the diving depth.

7. A design method for a deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure, characterized in that, The deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure according to claims 1 to 6 includes the following steps: S1: Determine the thickness t1 of the ceramic pressure-resistant structure based on the deep-sea hydrostatic pressure load; S2: Considering external transient high-pressure impact loads, determine the thickness t2 of the titanium alloy pressure-resistant structure; S3: Considering external transient high-pressure impact loads, determine the thickness t3 of the carbon fiber pressure-resistant structure; S4: Optimize the design with the thickness of the ceramic, titanium alloy and carbon fiber layers as design variables, and with the goal of minimizing mass and minimum implosion impact load. S5: An orthogonal experimental combination table is established using the deep-sea implosion fluid-structure interaction numerical method, and the optimal design variables are output; S6: Conduct fluid-structure interaction analysis of the implosion-resistant and impact-resistant composite pressure-resistant structure of deep-sea ceramic-titanium alloy-carbon fiber under impact load to verify its explosion suppression and impact resistance performance.

8. The design method of the deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 7, characterized in that, In step S1, when determining the thickness t1 of the ceramic pressure-resistant spherical shell (1), it is necessary to first use the formula... The critical collapse load P of the ceramic pressure-resistant spherical shell (1) is obtained by calculating the deep-sea hydrostatic pressure and then using the formula for the critical collapse load of the pressure-resistant structure under the action of deep-sea hydrostatic pressure. cr,1 , In the formula, R1 is the radius of the inner wall of the ceramic pressure-resistant spherical shell (1), E1 is the elastic modulus of the ceramic material used, and μ1 is the Poisson's ratio of the ceramic material used; And satisfy In the formula, n 1 represents the safety factor for the ceramic pressure-resistant structure; Finally, the wall thickness t1 of the ceramic pressure-resistant structure is obtained based on the calculation formula of the brittle thin-walled pressure-resistant structure.

9. The design method of the deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 7, characterized in that, In step S5, when establishing the orthogonal test combination table, the values ​​of the ceramic pressure-resistant structure thickness t1, the titanium alloy pressure-resistant structure thickness t2, and the carbon fiber pressure-resistant structure thickness t3 are changed sequentially. The total mass and the implosion impact load that the ceramic-titanium alloy-carbon fiber composite pressure-resistant structure can withstand under different thickness ratios are calculated. The data in the orthogonal test combination table are trained into a surrogate model using a neural network algorithm. Based on the surrogate model, the optimal design variables t1, t2, and t3 are output to minimize the total mass and maximize the implosion impact load that can be withstood.

10. The design method of the deep-sea explosion-suppressing and impact-resistant composite pressure-resistant structure as described in claim 7, characterized in that, In step S4, the total mass m of the composite pressure-resistant structure is calculated using the mass equations for each layer of ceramic, titanium alloy, and carbon fiber: m1 is the mass of the ceramic pressure-resistant spherical shell (1), and ρ1 is the density of the ceramic used in the ceramic pressure-resistant spherical shell (1). m2 is the mass of the titanium alloy pressure spherical shell (2), and ρ2 is the density of the titanium alloy used in the titanium alloy pressure spherical shell (2). m3 is the mass of the carbon fiber pressure spherical shell (3), and ρ3 is the density of the carbon fiber used in the carbon fiber pressure spherical shell (3). An implosion shock wave monitoring point was set up at a distance L from the outer surface of the composite pressure-resistant structure. The implosion shock wave pressure P at the monitoring point was calculated using a deep-sea implosion fluid-structure interaction numerical method. shock , with P shock Minimum is used as the criterion for determining the minimum implosion impact load.

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