Subsurface buoy shell strength strain test method and system

Abstract

The invention belongs to but is not limited to the technical field of seabed monitoring, and particularly relates to a strain test method and system for subsurface buoy shell strength, and the method comprises the steps: S1, selecting points on the surface of a shell, and pasting strain gauges; s2, putting into a sealed kettle, and injecting water and pressurizing; s3, testing the strain condition of the shell by using a strain tester; and S4, the pressure tolerance degree of the shell is analyzed through calculation. The buoyancy provided by the floating body shell and the overall weight of the subsurface buoy are calculated in detail, and the needed ballast balance weight is accurately measured and calculated. Buoyancy and gravity balance is verified through dynamic simulation, it is ensured that the subsurface buoy can stably suspend or settle in water, and the design feasibility and the actual application effect are improved.

Description

Technical Field

[0001] The present invention belongs to but is not limited to the field of seabed monitoring technology, and in particular relates to a strain testing method and system for the strength of a buoy shell. Background Art

[0002] With the in-depth development of marine resources, submersible buoys have begun to be widely used in the field of civil marine engineering. Compared with advanced underwater equipment such as underwater robots and submersibles, submersible buoys have advantages such as simple structure and low cost in some marine monitoring projects, and have great application prospects. Since submersible buoys work in seawater, the working environment and some design points are different from those of general land equipment, and have some special requirements and methods. In marine monitoring, submersible buoy systems have the advantages of long observation time, reliable results, and high concealment.

[0003] In view of the demand for deep development of marine resources and the extensive application of submersible buoys in the field of civil marine engineering, the existing technology has the following technical problems that need to be solved urgently:

[0004] 1. Insufficient shell strength and pressure resistance: Submersible buoys need to withstand deep-sea high-pressure environments during long-term ocean monitoring. Existing shell designs often cannot meet the safety and stability requirements under extreme pressures, and are prone to structural deformation or rupture, affecting the normal operation of the equipment and the reliability of data collection.

[0005] 2. Material corrosion resistance: The buoy is immersed in seawater for a long time, and the corrosiveness of seawater causes the shell material to lose strength and shorten its service life. The existing technology has deficiencies in the selection of corrosion-resistant materials and cannot effectively resist the long-term erosion of seawater, thus affecting the performance and reliability of the buoy.

[0006] 3. Limited data transmission and energy supply: Submersible buoys usually need to operate autonomously for a long time in the ocean. Existing technologies are still insufficient in terms of data transmission stability and energy supply durability, making it difficult to meet the needs of remote monitoring and long-term data collection. This problem is particularly prominent in deep-sea environments, where data transmission delays and energy depletion risks are high.

[0007] 4. Insufficient concealment and anti-interference capabilities of the equipment: Submersible buoys need to be highly concealed in ocean monitoring to avoid human interference or damage by marine organisms. Existing technologies still need to be improved in terms of improving the concealment and anti-interference capabilities of equipment, and it is difficult to ensure the stability of the equipment and the accuracy of the data in complex marine environments. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides a strain testing method and system for the strength of a buoy shell.

[0009] The present invention is implemented as follows: a strain testing method for the strength of a buoy shell, comprising:

[0010] S1 uses finite element analysis software to simulate pressurization and obtain the stress-strain diagram of each part of the shell.

[0011] S2, select points to paste strain gauges according to the parts of the shell surface with severe strain in the figure;

[0012] S3, after the conductor is watertightened, it is placed in a sealed kettle with a pressure sensor and then filled with water to increase pressure;

[0013] S4, a list of data on the changes caused by testing the water pressure of the sensor using a strain gauge;

[0014] S5. Calculate and analyze the stress and strain tolerance of the shell's measured points according to design requirements.

[0015] Furthermore, in order to keep the buoy upright in the water, during the three-dimensional simulation design, the mechanical components and batteries inside the float are placed as close to the bottom of the float as possible, so that the center of mass of the buoy as a whole is significantly lower than the center of buoyancy.

[0016] Furthermore, the buoy shell is an axially rotating body, and the pressure resistance of each point can be measured along the meridian from top to bottom. According to the principles of structural mechanics and the prompts of ANSYS simulation software, the upper structure of the hemisphere is relatively weak, and resistance strain gauges can be pasted on the estimated weak points of the shell to detect the strain amounts of six key points. The deformation detection at each patch is in three directions: horizontal, vertical and 45 degrees.

[0017] Furthermore, the 18 signal channels isolated by the waterproof sealing joint simultaneously collect strain data to analyze and compare the strain amounts.

[0018] Furthermore, after the shell to be tested is placed in the pressure autoclave, the strain gauge connection line is connected to the static resistance strain gauge, and the pressure is gradually increased while the strain gauge measurement data is collected by a PC through the network port.

[0019] Furthermore, the pressure is evenly applied at intervals of 0.1MPa. After the test, the strain gauge data is extracted and a special test software is compiled to summarize the multi-channel strain data collected and calculate the equivalent stress on the buoy underwater. The computer simulation is then used for analysis to determine the pressure resistance, draw the test curve, and point out the weak points and improvement measures.

[0020] Calculation of equivalent stress at six weak points

[0021] Another object of the present invention is to provide a computer device, which includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of the strain testing method for the strength of the buoy shell.

[0022] Another object of the present invention is to provide a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of the strain testing method for the strength of the buoy shell.

[0023] Another object of the present invention is to provide an information data processing terminal, which includes the strain testing system for the strength of the buoy shell.

[0024] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0025] First, accurate buoyancy and ballast weight calculation: Detailed calculation of the buoyancy provided by the outer shell of the float and the overall weight of the buoy, and accurate calculation of the required ballast weight. Dynamic simulation verifies the balance of buoyancy and gravity to ensure that the buoy can stably suspend or sink in the water, improving the feasibility of the design and the actual application effect.

[0026] Second, the present invention proposes a more accurate and effective strain testing method to address the deficiencies in existing buoy shell strength testing technologies. Traditional shell strength testing methods usually rely on simple pressure tests, which make it difficult to accurately measure the strain distribution of the shell under high pressure environments, especially in the strain monitoring of key stress points. This limitation makes it impossible to accurately assess the pressure tolerance of the shell in actual use, increasing the safety risks of buoys in deep-sea applications.

[0027] By attaching strain gauges to the shell surface, the present invention can monitor the strain changes of the shell in real time during the pressurization process, especially the strain data collection of weak parts of the structure. This method makes up for the shortcomings of traditional testing methods, can more accurately capture the stress concentration phenomenon of the shell under high pressure environment, and provides key experimental data support for the design and optimization of the buoy shell. This improvement significantly improves the accuracy and reliability of the test.

[0028] In addition, the present invention conducts the test in a sealed kettle simulating an underwater high-pressure environment, ensuring the authenticity and controllability of the test conditions. Compared with the traditional simple compression test, the method of the present invention is closer to the stress environment of the buoy under actual working conditions, making the test results more valuable for reference. This ability to accurately simulate the underwater environment enables the present invention to more accurately evaluate the pressure resistance performance of the shell, reducing the uncertainty in design and use.

[0029] In summary, the present invention has achieved significant technical progress on the basis of the prior art. Through high-precision strain monitoring and real pressure environment simulation, it not only improves the accuracy and reliability of the shell strength test, but also provides a more scientific data basis for the design and material selection of the buoy shell, and ultimately improves the safety and reliability of the buoy in the deep sea environment. These advances help promote the development of buoy technology and improve the overall performance of marine detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a strain testing method for the strength of a buoy shell provided by an embodiment of the present invention;

[0031] Figure 2 It is a structural diagram of a strain testing system for the strength of a buoy shell provided by an embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the structural design of the latent buoy provided by an embodiment of the present invention;

[0033] Figure 4 is a simulation curve diagram of total strain changing with pressure provided by an embodiment of the present invention;

[0034] Figure 5 is a simulation curve diagram of the change of equivalent stress with pressure provided by an embodiment of the present invention;

[0035] Figure 6 is a block diagram of beacon pressure resistance detection provided by an embodiment of the present invention;

[0036] Figure 7 is a curve diagram of a beacon pressure resistance experiment provided by an embodiment of the present invention;

[0037] Figure 8 It is a bar graph of pressure and equivalent stress at different positions provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The present invention provides a strain testing method for testing the strength of a buoy shell. By combining finite element analysis with actual pressure testing, the pressure resistance and structural stability of the shell are accurately evaluated. First, the stress and strain conditions of the shell under pressure are simulated and analyzed using finite element analysis software. Through simulation, a stress-strain distribution diagram of each part of the shell is generated, and the parts of the shell surface with the most severe strain are identified. These parts are usually the areas where the shell is most prone to structural problems in actual use, so special attention needs to be paid in subsequent tests.

[0040] Next, select points on the identified areas with severe strain and paste strain gauges. The strain gauges can sense the tiny deformations on the surface of the shell when it is under pressure and convert these deformations into measurable electrical signals. In order to ensure the accuracy of the test and the reliability of the data, the wires to which the strain gauges are pasted are watertight to prevent seawater from entering the wire connection parts during the pressurization process and affecting the test results. After the watertight treatment is completed, the shell is placed in a sealed kettle with a pressure sensor for actual pressurization testing.

[0041] During the pressure test, the sealed kettle is gradually filled with water to increase the internal pressure, and the strain tester is used to record the data sent back by the strain gauge on the shell surface in real time. The strain tester records the strain changes of the shell under different water pressure conditions and tabulates the data. By comparing the strain value changes under different pressure conditions, the performance of the shell under high pressure environment can be preliminarily judged.

[0042] Finally, combined with the strain test data and design requirements, the stress and strain tolerance of the shell at the measured point are calculated and analyzed. By comparing with the design indicators, it is judged whether the shell meets the predetermined safety standards. If the strain value remains within the safety limit within the design pressure range, it means that the shell design is reasonable and can withstand the predetermined working pressure; otherwise, it is necessary to optimize the shell design or select a higher strength material. This method provides a scientific way to evaluate the strength and reliability of the buoy shell to ensure its safety and long life in actual use.

[0043] like Figure 1 As shown, the strain test method for the strength of the buoy shell includes:

[0044] S1, stick the strain gauge on the shell surface at selected points;

[0045] S2, put the sealed kettle into water and pressurize it;

[0046] S3, using a strain tester to test the strain of the shell;

[0047] S4, analyze the shell pressure tolerance through calculation.

[0048] The present invention provides a strain testing method for testing the strength of a buoy shell, which aims to evaluate its pressure tolerance by accurately measuring the strain of the shell during pressure. First, key stress points are selected on the shell surface, and strain gauges are pasted on these points. The strain gauge is a sensor that can sense tiny deformations on the shell surface. The selection of the point needs to consider the structural characteristics of the shell and the stress concentration area to ensure that the test results can reflect the true stress state of the shell.

[0049] Next, the shell with the strain gauge attached is placed in a sealed kettle and gradually filled with water to increase the pressure. The sealed kettle simulates the underwater high-pressure conditions in the actual use environment of the buoy. By controlling the pressurization process, the pressure environment at different depths can be accurately simulated. As the pressure increases, the shell will produce strain changes, which are recorded in real time by the strain gauge, providing a basis for subsequent data analysis.

[0050] During the pressurization process, the strain tester is used to monitor the strain of the shell surface in real time. The strain tester can accurately capture the tiny deformation of the shell surface by connecting the strain gauge and output these deformation data in the form of digital signals. The tester can not only monitor the strain changes of the shell during the gradual pressurization process, but also capture the strain characteristics of the shell when it reaches the ultimate pressure, which is crucial for analyzing the pressure resistance of the shell.

[0051] Finally, based on the data collected by the strain tester, the pressure tolerance of the shell is evaluated through calculation and analysis. By comparing the measured strain value with the theoretical calculated value, it can be determined whether the shell is working within a safe stress range. If the test results show that the shell has excessive strain or plastic deformation within the design pressure range, it means that the strength of the shell is insufficient and the design needs to be improved or a higher strength material needs to be selected. This method provides a systematic and scientific way to evaluate the strength and reliability of the buoy shell and ensure its safety in practical applications.

[0052] like Figure 2 As shown, the strain test system for the buoy shell strength includes:

[0053] Strain gauge arrangement module, which is used to paste strain gauges at selected points on the shell surface;

[0054] Water injection and pressurization module, put into the sealed kettle to inject water and pressurize;

[0055] The strain test module uses a strain tester to test the strain of the shell;

[0056] The pressure tolerance analysis module analyzes the shell pressure tolerance through calculation.

[0057] Parameter design of floating shell

[0058] The buoy of the present invention requires a working water depth of 150 meters, and the shell must ensure that it does not deform and become unstable to cause leakage under a pressure of 1.5MPa (megapascals). It must be considered that if the material strength is increased and the thickness of the shell is determined, it will directly affect the overall quality of the buoy. Therefore, when the buoyancy requirements are certain and the internal components have been basically determined, the volume, that is, the displacement, should be calculated under the condition of meeting the strength. In order to facilitate the floating and recovery of the buoy, the specific gravity should be designed to be around 0.8. Then, the volume and total mass data must be obtained through three-dimensional structural design, and a simulation analysis of the force must be performed to obtain a comprehensive result, and then verification calculations must be performed.

[0059] The shape of the shell of underwater working equipment is naturally closer to spherical and more pressure-resistant, but the problem of stable floating must also be considered, and standard parts should be referred to as much as possible. Through table lookup and calculation, the elliptical head of the aluminum alloy high-pressure vessel with a diameter of 42 mm and a thickness of 8 mm was selected, and its strength parameters are relatively close to the requirements.

[0060] The weight of the shell, the weight of the internal parts of the buoy and the floating specific gravity requirements, at this time the volume of the buoy is basically determined. Figure 3 .

[0061] The buoy is in the shape of an oblate sphere, with a flange in the middle, and can be disassembled. The bottom is a nylon base, and the top is a transparent PC plastic cover, which is sealed by an O-ring.

[0062] After other component samples or three-dimensional simulation designs are basically formed, the buoyancy parameters of the submersible instrument cabin (with floating body) are shown in Table 1.

[0063] Table 1 Buoyancy design parameters of submerged buoy instrument cabin (with floating body)

[0064]

[0065] It can be seen from Table 1 that through simulation and actual measurement, the mass of all components minus the displacement of the floating shell, external handles and upper and lower end covers is 6.5Kg, indicating that the instrument cabin float has a positive buoyancy of 6.5Kg in the water. In this design, according to the simulation calculation, the underwater weight of the ballast base = mass volume = 35Kg; and the downward weight of the submerged buoy after entering the water is 35Kg6.5Kg = 28.5Kg. The empirical data that the underwater stable weight is greater than 3 times the buoyancy is met.

[0066] In order to keep the buoy upright in the water, during the three-dimensional simulation design, the mechanical components and batteries inside the float are placed as close to the bottom of the float as possible, so that the center of mass of the buoy as a whole is significantly lower than the center of buoyancy.

[0067] Mechanical simulation and testing of submerged buoy

[0068] Strength simulation of buoy

[0069] After the design of the buoy's shell is completed using similar standard parts, mechanical simulation analysis must be carried out. Then, strain testing must be carried out after the prototype is made.

[0070] Due to space limitations, the simulation conclusions are given here:

[0071] Take 2 times the safety margin and look at it under a pressure of 3MPa. Figure 4 The curve of the maximum total strain of the submersible shell changing with the external pressure is given. The strains on the upper and lower ports of the shell and its flange cover are very small, both around 0.7mm, which will not cause the seal to become unstable.

[0072] The middle part of the buoy shell has the largest strain and stress. Figure 5 The variation of equivalent stress with pressure is given. Under a pressure of 3MPa, the maximum stress is less than 70MPa, which is much smaller than the yield strength of 5083 aluminum-magnesium material of 230MPa, and has sufficient safety factor. When the simulation pressure is increased to 6MPa, equivalent to a water depth of 600 meters, the shell still has a certain degree of safety, which verifies the feasibility of the design.

[0073] Pressure test of submersible buoy

[0074] The principle and basis of the pressure test of the submersible buoy are material mechanics and stress detection. Strain gauges are pasted on selected points on the shell surface, and then a sealed kettle is placed and pressurized with water. The strain of the shell is tested using a strain tester, and the pressure tolerance of the shell is analyzed by calculation.

[0075] The block diagram of the submersible pressure resistance test is as follows: Figure 6 shown.

[0076] The shell of the buoy is an axial rotating body. The pressure resistance of each point can be measured from top to bottom along the meridian. According to the principles of structural mechanics and the prompts of ANSYS simulation software, the upper structure of the hemisphere is relatively weak. Resistance strain gauges can be pasted on the estimated weak points of the shell to detect the strain amount of six key points. The deformation detection at each patch is in three directions: horizontal, vertical and 45 degrees.

[0077] The 18 signal channels isolated by waterproof sealing joints simultaneously collect strain data and analyze and compare the strain amounts.

[0078] After the sealing is done well, the pressure cooker is placed in the pressure vessel, the strain gauge connecting wire is connected to the static resistance strain gauge, and the pressure is gradually increased while the strain gauge measurement data is collected by a PC through the network port.

[0079] The pressure was applied evenly at intervals of 0.1 MPa, and the pressure resistance test data collected by the computer were shown in Table 2.

[0080] Table 2 Beacon pressure resistance test data record table

[0081]

[0082] After the test, the strain gauge data was extracted, and a special test software was compiled to summarize the collected multi-channel strain data to calculate the equivalent stress of the buoy underwater. Then the computer simulation was used for analysis to determine the pressure resistance, draw the test curve, and point out the weak points and improvement measures. The equivalent stress of the six weak points is shown in Table 3.

[0083] Table 3 Equivalent stress data under different pressures

[0084]

[0085] The equivalent stress simulation curves of the six weak points of the buoy shell are as follows: Figure 7 shown.

[0086] The conclusion of the withstand voltage test:

[0087] 1) The greater the pressure, the greater the strain and the greater the equivalent stress.

[0088] 2) When the pressure increases from 0 to 1.6 MPa, the equivalent stress of weak points 1, 2, 3, and 5 increases from 0 to about 61 MPa, and the equivalent stress of weak points 4 and 6 increases from 0 to about 40 MPa.

[0089] 3) At a water depth of 160 meters, the pressure resistance of points 4 and 6 is higher than that of points 1, 2, 3, and 5.

[0090] 4) Analyze the strain and equivalent stress at 6 points. The strain in the middle of the beacon shell is higher than that at both ends, and the equivalent stress in the middle of the shell is larger, which is consistent with the qualitative simulation results of ANSYS.

[0091] 5) The maximum equivalent stress among the 6 points is 61.403MPa, which is much smaller than the allowable tensile stress of 230MPa of the aluminum-magnesium alloy used in the shell. The strength of the beacon is qualified within 1.6Mpa, i.e., 160 meters water depth.

[0092] Figure 8 It is a bar graph of pressure and equivalent stress at different positions provided by an embodiment of the present invention.

[0093] in conclusion

[0094] The present invention proposes an overall design scheme for a ballast-release submersible buoy, which realizes the functions of underwater deployment, release, floating, positioning and recovery. The volume and underwater force are calculated according to the endurance and demand, and the submersible buoy can stably work at a depth of 150 meters for 500 hours; experimental results verify that the stress and strain of the magnesium-aluminum alloy spherical shell can withstand a pressure test at a simulated water depth of 160 meters. The marine detection work carried out based on this submersible buoy system has relatively improved stability and concealment.

[0095] Combination Figure 4 , Figure 5 and Figure 7 The following two conclusions can be drawn:

[0096] 1. The greater the pressure, the greater the strain and equivalent stress.

[0097] 2. When the pressure increases linearly from 0 to 1.6MPa, the equivalent stress of points 1, 2, 3, and 5 (middle area) increases from 0 to about 61MPa, and the equivalent stress of points 4 and 6 (edge ​​area) increases from 0 to about 40MPa. Compared with the middle area, the growth rate of equivalent stress is significantly slower. At a water depth of 160m, the pressure resistance of points 4 and 6 is higher than that of points 1, 2, 3, and 5.

[0098] Therefore, through strain analysis, it can be concluded that the strain in the middle of the beacon shell is higher than that at both ends, and the equivalent stress in the middle of the shell is larger. The maximum equivalent stress among the 6 points is 61.403MPa, which is much smaller than the allowable tensile stress of 230MPa of the aluminum-magnesium alloy used in the shell, that is, the strength is qualified within a water depth of 160 meters.

[0099] An application embodiment of the present invention provides a computer device, which includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the steps of a strain testing method for the strength of a buoy shell.

[0100] An application embodiment of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of a strain testing method for the strength of a buoy shell.

[0101] An application embodiment of the present invention provides an information data processing terminal, which includes a strain testing system for the strength of a buoy shell.

[0102] The present invention aims at the deficiencies in the existing buoy shell strength testing technology and proposes a more accurate and effective strain testing method. Traditional shell strength testing methods usually rely on simple pressure tests, which are difficult to accurately measure the strain distribution of the shell under high pressure environments, especially in the strain monitoring of key stress points. This limitation makes it impossible to accurately assess the pressure tolerance of the shell in actual use, increasing the safety risk of buoys in deep-sea applications.

[0103] By attaching strain gauges to the shell surface, the present invention can monitor the strain changes of the shell in real time during the pressurization process, especially the strain data collection of weak parts of the structure. This method makes up for the shortcomings of traditional testing methods, can more accurately capture the stress concentration phenomenon of the shell under high pressure environment, and provides key experimental data support for the design and optimization of the buoy shell. This improvement significantly improves the accuracy and reliability of the test.

[0104] In addition, the present invention conducts the test in a sealed kettle simulating an underwater high-pressure environment, ensuring the authenticity and controllability of the test conditions. Compared with the traditional simple compression test, the method of the present invention is closer to the stress environment of the buoy under actual working conditions, making the test results more valuable for reference. This ability to accurately simulate the underwater environment enables the present invention to more accurately evaluate the pressure resistance performance of the shell, reducing the uncertainty in design and use.

[0105] In summary, the present invention has achieved significant technical progress on the basis of the prior art. Through high-precision strain monitoring and real pressure environment simulation, it not only improves the accuracy and reliability of the shell strength test, but also provides a more scientific data basis for the design and material selection of the buoy shell, and ultimately improves the safety and reliability of the buoy in the deep sea environment. These advances help promote the development of buoy technology and improve the overall performance of marine detection equipment.

[0106] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A strain test method for the strength of a submerged buoy shell, characterized in that: include: S1 uses finite element analysis software to simulate pressurization and obtain the stress-strain diagram of each part of the shell. S2, select points to paste strain gauges according to the parts of the shell surface with severe strain in the figure; S3, after the conductor is watertightened, it is placed in a sealed kettle with a pressure sensor and then filled with water to increase pressure; S4, a list of data changes caused by testing the water pressure of the sensor using a strain gauge; S5. Calculate and analyze the stress and strain tolerance of the shell's measured points according to design requirements.

2. The strain testing method for the strength of the buoy shell according to claim 1, characterized in that: In order to keep the buoy upright in the water, during the three-dimensional simulation design, the mechanical components and batteries inside the float are placed as close to the bottom of the float as possible, so that the center of mass of the buoy as a whole is significantly lower than the center of buoyancy.

3. The strain testing method for the strength of the buoy shell according to claim 1, characterized in that: The shell of the buoy is an axial rotating body. The pressure resistance of each point can be measured from top to bottom along the meridian. According to the principles of structural mechanics and the prompts of ANSYS simulation software, the upper structure of the hemisphere is relatively weak. Resistance strain gauges can be pasted on the estimated weak points of the shell to detect the strain amount of six key points. The deformation detection at each patch is in three directions: horizontal, vertical and 45 degrees.

4. The strain testing method for the strength of the buoy shell according to claim 1, characterized in that: The 18 signal channels isolated by waterproof sealing joints simultaneously collect strain data and analyze and compare the strain amounts.

5. The strain testing method for the strength of the buoy shell according to claim 1, characterized in that: After the sealing is done well, the pressure cooker is placed in the pressure vessel, the strain gauge connecting wire is connected to the static resistance strain gauge, and the pressure is gradually increased while the strain gauge measurement data is collected by a PC through the network port.

6. The strain testing method for the strength of the buoy shell according to claim 1, characterized in that: The pressure is applied evenly at intervals of 0.1 MPa. After the test, the strain gauge data is extracted, and a special test software is compiled to summarize the collected multi-channel strain data to calculate the equivalent stress of the buoy underwater; then the computer simulation is used for analysis to determine the pressure resistance, draw the test curve, and point out the weak points and improvement measures. The equivalent stress of the six weak points is calculated.

7. A strain testing system for the strength of a buoy shell that implements the strain testing method for the strength of a buoy shell as claimed in any one of claims 1 to 6, characterized in that: include: Strain gauge arrangement module, which is used to paste strain gauges at selected points on the shell surface; Water injection and pressurization module, put into the sealed kettle to inject water and pressurize; The strain test module uses a strain tester to test the strain of the shell; The pressure tolerance analysis module analyzes the shell pressure tolerance through calculation.

8. A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the strain testing method for the strength of the buoy shell as claimed in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, which, when executed by a processor, enables the processor to execute the steps of the strain testing method for the strength of a buoy shell as claimed in any one of claims 1 to 6.

10. An information data processing terminal, comprising the strain testing system for the strength of a buoy shell according to claim 7.

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