A method and system for predicting the life of a sealed multi-cell steel structure

Abstract

The application provides a life prediction method and system for airtight multi-cell steel structure, and relates to the technical field of structure finite element analysis, which comprises the following steps: taking the airtight multi-cell steel structure as a prototype, determining a scale reduction ratio, and establishing a scaled structure of the airtight multi-cell steel structure; performing laboratory accelerated environmental testing and mechanical testing on the scaled structure under the equivalent service environment of the airtight multi-cell steel structure, obtaining mechanical response test data of the scaled structure, and determining test targets of the scaled structure at different times; taking scaled plate material data as input to establish a simulation model of the scaled structure and obtain a transfer coefficient; taking original plate material data as input to establish a full-size structure simulation model of the airtight multi-cell steel structure; and using the full-size structure simulation model to output crack propagation size and residual life of a target welded structure at different times under the full-size structure. The application effectively improves the accuracy of life prediction of the airtight multi-cell steel structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural finite element analysis, in particular to a life prediction method and system for a closed multi-cell steel structure. BACKGROUND

[0002] Large closed multi-cell steel structures have the advantages of strong bearing capacity and fast construction speed, and are increasingly widely used in fields such as buildings, bridges, wind power and aerospace support systems. Welding is the main connection method for steel structures. The number of welds of large closed multi-cell steel structures is large, and most of the welds are hidden and difficult to detect, so cracks cannot be found in time, causing great safety hazards.

[0003] Closed multi-cell steel structures are usually used in ships, underwater structures, bridges, storage tanks or offshore platforms, etc. Due to the harsh environment, the corrosion damage of the structure is accelerated, and the fatigue life is significantly reduced. Life prediction is a key factor to ensure the long-term reliability, safety and functionality of the structure. The life prediction method of large closed multi-cell steel structures can better prolong the service life of the structure, improve economic efficiency and safety, and ultimately improve the reliability and performance of the steel structure.

[0004] However, the test site and equipment of the traditional life prediction method are usually difficult to provide sufficient loading capacity to simulate the actual working condition, and the load consistent with the real condition cannot be applied during the test process, which limits the accurate measurement of the mechanical response of the structure under the real service environment. For full-size experiments of large steel structures, the test equipment and site requirements are extremely high, resulting in huge costs, making it difficult to conduct large-scale fatigue tests and repetitive tests. The existing simulation method is prone to deviation when accurately simulating crack propagation, resulting in low efficiency and inability to guarantee accuracy of life prediction. SUMMARY

[0005] In order to solve the technical problems in the prior art that the test site and equipment of the traditional life prediction method are usually difficult to provide sufficient loading capacity to simulate the actual working condition, and the load consistent with the real condition cannot be applied during the test process, which limits the accurate measurement of the mechanical response of the structure under the real service environment. For full-size experiments of large steel structures, the test equipment and site requirements are extremely high, resulting in huge costs, making it difficult to conduct large-scale fatigue tests and repetitive tests. The existing simulation method is prone to deviation when accurately simulating crack propagation, resulting in low efficiency and inability to guarantee accuracy of life prediction, the present application provides a life prediction method and system for a closed multi-cell steel structure.

[0006] The technical scheme provided by the embodiments of the present application is as follows:

[0007] First aspect

[0008] The life prediction method of the closed multi-cell steel structure provided by the embodiment of the present application comprises:

[0009] S1: taking the closed multi-cell steel structure as a prototype, determining the scaling ratio of the closed multi-cell steel structure based on the stiffness equivalence principle;

[0010] S2: using a scaling plate, establishing a scaled structure of the closed multi-cell steel structure according to the scaling ratio, wherein the scaling plate is a thin plate material obtained by scaling the original plate material of the closed multi-cell steel structure according to the scaling ratio;

[0011] S3: performing a physical test on the scaling plate and the scaled structure in an equivalent service environment of the closed multi-cell steel structure, obtaining mechanical response test data of the scaled structure under a preset load, and determining test targets of the scaled structure at different times, wherein the test targets include a target welded structure crack propagation size and a target welded structure residual life;

[0012] S4: taking the scaling plate material data as input data, establishing a scaled structure simulation model of the scaled structure with the mechanical response test data as a target, and obtaining a transfer coefficient of the material parameters of the closed multi-cell steel structure in the scaled structure simulation model and each test target, wherein the transfer relationship includes a crack propagation coefficient and a residual life change coefficient;

[0013] S5: taking the original plate material data as input data, and establishing a full-size structure simulation model of the closed multi-cell steel structure according to the transfer coefficient;

[0014] S6: using the full-size structure simulation model to output the crack propagation size and the residual life of the target welded structure at different times under the full-size structure.

[0015] The second aspect

[0016] The life prediction system of the closed multi-cell steel structure provided by the embodiment of the present application comprises:

[0017] a processor;

[0018] a memory, the memory storing computer readable instructions, and the computer readable instructions being executed by the processor to realize the life prediction method of the closed multi-cell steel structure according to the first aspect.

[0019] The third aspect

[0020] The computer readable storage medium provided by the embodiment of the present application stores a computer program, and the program is executed by the processor to realize the life prediction method of the closed multi-cell steel structure according to the first aspect.

[0021] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0022] In the application, by establishing a scaled structure, the requirements of test site and equipment are effectively reduced, the experimental cost is reduced, and under the limited loading capacity and test conditions, the effective mechanical response test can still be carried out, which provides a realistic and feasible way for the life prediction of large structures. The simulation results are checked and corrected through the mechanical response test data, the crack propagation can be accurately simulated, the accuracy of the simulation results is improved, the influence of static load and fatigue load is considered in the physical test, the life prediction is more in line with the actual use conditions, according to the transfer coefficient between the closed multi-cell steel structure material parameters and each test target, the test results of the scaled model are effectively transferred to the full-size structure model, the prediction error caused by the difference in structure size or loading conditions is avoided, the accuracy and reliability of the prediction are improved, and the crack propagation size and residual life of the closed multi-cell steel structure under actual service conditions can be better reflected. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The flowchart of the life prediction method of the closed multi-cell steel structure provided in the embodiment of the present application is shown.

[0025] Figure 2 The schematic diagram of the closed multi-cell steel structure provided in the embodiment of the present application is shown.

[0026] Figure 3 The structure schematic diagram of the life prediction system of the closed multi-cell steel structure provided in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] The technical solutions in the present application will be described below in combination with the drawings.

[0028] In the embodiments of the present application, the words such as "example", "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0029] In order to make the technical problems, technical solutions and advantages of the present application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0030] With reference to the accompanying drawings, the flow chart of a life prediction method of a sealed multi-cell steel structure is shown. Figure 1 , shows a flow chart of a life prediction method of a sealed multi-cell steel structure provided by an embodiment of the application.

[0031] The embodiment of the application provides a life prediction method of a sealed multi-cell steel structure, which comprises the following steps:

[0032] S1: Taking the sealed multi-cell steel structure as a prototype, a scaling ratio of the sealed multi-cell steel structure is determined based on a stiffness equivalence principle.

[0033] The preset ratio refers to a reduction ratio determined according to experimental conditions (such as a site, a device loading capacity and the like), and is used to construct a reduced model corresponding to an actual size. The sealed multi-cell steel structure refers to a steel load-bearing structure composed of multiple compartments or sealed spaces. The scaled structure is a model reduced according to the preset ratio, and has similar geometric and mechanical characteristics to the actual structure.

[0034] It should be noted that the size of the preset ratio can be set according to actual needs by those skilled in the art, and the application does not make any limitation here.

[0035] Specifically, the size of the space of the existing test site and the maximum loading capacity of the device are evaluated to ensure that the scaled model can run within the loading range of the device and meet the site conditions; on the basis of ensuring that the scaled structure maintains similarity in mechanical characteristics with the full-size structure, a corresponding scale ratio is selected to ensure the effectiveness and representativeness of the experimental data; on this basis, through the trade-off between the test equipment capacity, the site conditions and the cost budget, the scale ratio (such as 1:10) that can achieve the test target is selected from the above ratios.

[0036] In a possible implementation, the scaling ratio of the sealed multi-cell steel structure relative to the scaled structure is specifically 10:1.

[0037] It should be noted that the scaling ratio determined based on the stiffness equivalence principle can optimize the design of the sealed multi-cell steel structure, improve the mechanical performance and safety thereof, and ensure the stability and reliability of the structure under different sizes.

[0038] S2: A scaled structure of the sealed multi-cell steel structure is established by using scaled plates according to the scaling ratio, wherein the scaled plate is a thin plate material obtained by scaling the original plate material of the sealed multi-cell steel structure according to the scaling ratio.

[0039] In a possible implementation, the scaled plate material of the sealed multi-cell steel structure comprises a scaled sealed multi-cell steel structure base material and a scaled sealed multi-cell steel structure weld material.

[0040] The closed multi-cell steel structure base material refers to the original material part of the steel structure that has not been subjected to welding treatment, and is usually used to bear the main stress of the structure. The closed multi-cell steel structure weld material is a welding material used to connect different base material parts, and usually has similar mechanical properties to the base material, but needs to have good weldability and high fatigue resistance.

[0041] Specifically, by considering the base material and the weld material respectively, the overall performance and local fatigue behavior of the structure can be more accurately evaluated, making the prediction of crack propagation and remaining life more accurate, which helps to improve the safety and service life of the steel structure.

[0042] It should be noted that the construction of the scaled structure can be tested in a limited experimental site and equipment loading capacity, reducing the experimental cost, while maintaining the mechanical similarity with the full-size structure, ensuring the effectiveness and representativeness of the experimental data, verifying the design scheme in the early stage of the experiment, improving the accuracy of the simulation model, and reducing the risk and difficulty of the full-size experiment.

[0043] S3: performing physical tests on the scaled plate and the scaled structure under the equivalent service environment of the closed multi-cell steel structure, obtaining the mechanical response test data of the scaled structure under the pre-set load, and determining the test target of the scaled structure at different times, wherein the test target includes the target weld structure crack propagation size and the target weld structure remaining life.

[0044] The service environment of the closed multi-cell steel structure refers to the environmental conditions in which the steel structure is used in actual use, in this invention, it refers to the offshore environment, including temperature, humidity, corrosion and load factors, the pre-set load is a static or dynamic load artificially applied in the experiment, to simulate the stress condition in actual use, the crack propagation size refers to the size of the crack in the weld structure changes with time or load, the remaining life refers to the time or load cycle that the steel structure can still be safely used under the current conditions.

[0045] In one possible implementation, the physical test includes a tensile test, an expansion test, and a fracture toughness test.

[0046] The tensile test is to measure the strength, elongation and fracture point of the sample by applying tension to the sample, the expansion test is to evaluate the behavior of crack propagation in the material, usually by observing the rate of crack propagation under periodic load, and the fracture toughness test is to measure the ability of the material to resist crack propagation, reflecting the toughness and fracture resistance of the material.

[0047] It should be noted that in combination with tensile test, expansion test and fracture toughness test, the mechanical properties of steel structure materials under different loads and stress states can be comprehensively evaluated, more accurate material property data can be provided to help predict the crack propagation behavior and residual life of materials in actual application, and the scientificity and reliability of structure design and maintenance can be improved.

[0048] In one possible implementation, the pre-set load includes static load and fatigue load.

[0049] Among them, the static load refers to the constant load acting on the structure, which does not change with time, such as gravity or fixed pressure, and the fatigue load refers to the repeated or cyclic load, which may cause fatigue damage to the material over time, leading to crack propagation or fracture.

[0050] It should be noted that static load can help evaluate the load-carrying capacity of the structure under constant stress, while fatigue load can simulate the effect of cyclic stress on materials and welds in actual working conditions. By considering both loads, the strength, fatigue life and crack propagation behavior of steel structures can be more comprehensively predicted, and the accuracy of structure design and life prediction can be improved.

[0051] In one possible implementation, the structure test includes static test and pre-crack fatigue test.

[0052] Among them, the static test is to apply a constant static load to the structure to evaluate its deformation, stiffness and load-carrying capacity under fixed stress, and the pre-crack fatigue test is to introduce a crack in the structure and observe the crack propagation behavior by cyclically applying fatigue load, so as to evaluate the fatigue performance and fracture risk of the material under long-term loading.

[0053] Specifically, for the scaled structure, tensile test is carried out using thin plate base material and weld material. Since the cracks are all located in the weld area, the metal fatigue crack propagation test is mainly carried out for the weld material. At the same time, static test and pre-crack fatigue test of the scaled structure are carried out, in which force, displacement and strain sensors are arranged to measure the mechanical response data of the scaled structure under static and fatigue loads.

[0054] It should be noted that by conducting physical tests in service environment, real mechanical response data of the scaled structure can be obtained, which can more accurately simulate actual use conditions, so as to dynamically monitor and evaluate the crack propagation and residual life of the welded structure, improve the reliability of life prediction, and help identify potential structure problems in advance to ensure structure safety.

[0055] S4: input the scaled plate material data as input data, establish a scaled structure simulation model of the scaled structure aiming at the mechanical response test data, and obtain the transfer coefficients of the sealed multi-cell steel structure material parameters and each test target in the scaled structure simulation model, wherein the transfer relationship includes a crack propagation coefficient and a residual life change coefficient.

[0056] The scaled structure simulation model is a computer model constructed based on the scaled structure and the test data, used to simulate the mechanical behavior of the real structure under different load conditions. The transfer coefficient is a coefficient describing the relationship between the material parameters in the simulation model and the test targets (such as crack propagation size and residual life). The crack propagation coefficient reflects the relationship between crack propagation rate and load or stress, and the residual life change coefficient is used to predict the change of the residual life of the structure under different conditions.

[0057] In one possible implementation, the mechanical response test data under static load includes mechanical response test data under static load and mechanical response test data under fatigue load.

[0058] It should be noted that, in combination with the mechanical response test data under static and fatigue load, the performance of the structure under different load conditions can be comprehensively evaluated. The static load data can verify the load-carrying capacity of the structure, and the fatigue load data can predict the long-term durability and crack propagation of the structure, helping to optimize the structure design and improve the accuracy of life prediction.

[0059] In one possible implementation, the mechanical response under static load includes the overall deformation of the scaled structure, the overall stiffness value of the scaled structure, and the local stress value of the scaled structure.

[0060] The overall deformation refers to the total deformation degree of the scaled structure under static load, reflecting the flexibility or rigidity of the structure. The overall stiffness value measures the ability of the structure to resist deformation when subjected to force. The greater the stiffness, the less likely the structure is to deform. The local stress value refers to the stress borne by certain specific regions of the structure, which is usually used to analyze the stress concentration phenomenon of the structure.

[0061] It should be noted that by evaluating the overall deformation, stiffness value and local stress value, the mechanical behavior of the scaled structure under static load can be comprehensively mastered, helping to identify possible weak points of the structure, optimize the design, improve the load-carrying capacity and safety of the structure, and ensure the reliability and stability of the structure in practical application.

[0062] In one possible implementation, the mechanical response under fatigue load includes the occurrence time of fatigue crack and the propagation size of fatigue crack.

[0063] The moment of generation of the fatigue crack refers to a specific time point at which the material or structure starts to appear cracks under the action of fatigue load, and is an important index for evaluating the fatigue performance of the material. The extension size of the fatigue crack refers to the size of the crack that has been generated and extended with the application of the cyclic load under the continuous fatigue load, which is crucial for evaluating the service life and safety of the material.

[0064] In actual operation, the initial defect of the weld at the bottom of the second support point and the fourth support point is prefabricated, and the fatigue load is loaded in a step-by-step increasing manner, with the load level being set as 1P, 2P and 3P respectively. The generation of the fatigue crack during the loading process is monitored in real time. The test results show that when the fatigue peak load is 1P and 2P, the defect does not generate a fatigue crack. When the load reaches 3P, the fatigue crack starts to appear at the defect of the weld at the bottom of the second support point. These results are basically consistent with the test phenomena, verifying the accuracy of the scaled simulation model under the fatigue working condition. Overall, the test and the simulation model complement each other, effectively evaluating the fatigue performance and crack extension characteristics of the scaled structure.

[0065] It should be noted that by establishing a simulation model and obtaining the transfer coefficient, the mechanical behavior of the scaled structure under different load conditions can be simulated and predicted more efficiently and accurately. The introduction of the transfer coefficient enables the simulation results to more accurately reflect the dynamic changes of crack extension and residual life, which helps to improve the accuracy of structure life prediction and reduce the cost and time of tests.

[0066] S5: The original plate material data is taken as input data, and a full-size structure simulation model of the sealed multi-cell steel structure is established according to the transfer coefficient.

[0067] It should be noted that by establishing a full-size structure simulation model through the transfer coefficient, the mechanical behavior of the sealed multi-cell steel structure under actual working conditions can be accurately simulated. The simulation model is extended based on the test and calculation results of the scaled model, ensuring the accuracy of crack extension and residual life prediction.

[0068] S6: The crack extension size and residual life of the target welded structure at different moments under the full-size structure are output by the full-size structure simulation model.

[0069] It should be noted that by using the full-size structure simulation model to output the crack extension size and residual life of the welded structure, the fatigue behavior of the structure can be accurately predicted under full-size conditions, avoiding the errors that may be caused by relying solely on the scaled model. This provides a more realistic evaluation of crack extension and life under engineering scenarios. This process is efficient and economical, and can provide accurate basis for engineering decision-making without full-size physical tests, improving the safety, reliability and maintenance efficiency of the structure, and reducing operating costs and risks.

[0070] Reference is made to the drawings attachedFigure 2 Figure 1 shows a schematic diagram of the closed multi-cell steel structure provided by the embodiment of the present application.

[0071] As shown in Figure 2 The closed multi-cell steel structure is a steel box girder composed of a first supporting point, a second supporting point, a third supporting point, a fourth supporting point, a bidirectional cross beam, a short beam, and a rectangular outer rim, wherein the 1#-4# areas in the upper surface of the bidirectional cross beam bear vertical concentrated forces, the bottom of the rectangular outer rim bears the vertical upward support force provided by the surrounding supporting surface, and the bidirectional cross beam, the short beam, and the rectangular outer rim of the core bearing area are all formed by welding steel plates to form components, and the components are connected by bolts to form a complete structure. In addition, stiffening ribs with a certain spacing are arranged inside all the components, thereby forming a multi-cell steel beam. In order to ensure the safety of the structure in service, it is necessary to study the crack propagation and remaining life of the weld seam at the tensile position at the bottom of the fourth supporting point under the service condition.

[0072] For example, taking a large steel box girder structure as a prototype, a scale ratio of 1:10 is selected based on the loading capacity of the test site and equipment to construct a scaled structure. Tensile tests of the thin plate base material and the weld material of the scaled structure are carried out. Since the cracks are arranged in the weld area, fatigue crack propagation tests are specially carried out on the weld material metal. The mechanical responses of the scaled structure under static and fatigue loads are measured by force, displacement, and strain sensors. Important data such as overall deformation, stiffness, and local stress of the scaled structure under static and fatigue conditions are obtained. A scaled structure simulation model of the scaled structure is established, and static tests and fatigue tests of the scaled structure with pre-cracks are carried out to verify the accuracy of the scaled model in static and fatigue analysis. The transfer coefficients of the material parameters of the closed multi-cell steel structure and each test target are obtained. Based on the transfer coefficients, a full-scale simulation model is constructed. Through simulation analysis, the crack propagation size and remaining life of the crack in service are obtained.

[0073] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0074] In the present application, by establishing a scaled structure, the requirements of test site and equipment are effectively reduced, the experimental cost is reduced, and under the limited loading capacity and test conditions, the effective mechanical response test can still be carried out, which provides a realistic and feasible way for life prediction of large structures, and the simulation results are checked and corrected through the mechanical response test data, so that the crack propagation can be accurately simulated, the accuracy of the simulation results is improved, the influence of static load and fatigue load is considered in the physical test, so that the life prediction is more in line with the actual use conditions, according to the transfer coefficient between the closed multi-cell steel structure material parameters and each test target, the test results of the scaled model are effectively transferred to the full-size structure model, the prediction error caused by the difference in structure size or loading conditions is avoided, the accuracy and reliability of the prediction are improved, and the crack propagation size and residual life of the closed multi-cell steel structure under actual service conditions can be better reflected.

[0075] Referring to the accompanying drawings Figure 3 , a structure schematic diagram of a life prediction system of a closed multi-cell steel structure provided by the present application is shown.

[0076] The present application also provides a life prediction system 20 of a closed multi-cell steel structure, which is applied to the life prediction method of the closed multi-cell steel structure described above, and comprises:

[0077] A processor 201.

[0078] A memory 202, the memory 202 stores computer readable instructions, and when the computer readable instructions are executed by the processor 201, the life prediction method of the closed multi-cell steel structure as in the method embodiment is realized.

[0079] The life prediction system 20 of the closed multi-cell steel structure provided by the present application can execute the life prediction method of the closed multi-cell steel structure described above, and realize the same or similar technical effects, in order to avoid repetition, the present application will not be described again.

[0080] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0081] In the present application, by establishing a scaled structure, the requirements of test site and equipment are effectively reduced, and the experimental cost is reduced, and under the limited loading capacity and test conditions, the effective mechanical response test can still be carried out, which provides a realistic and feasible way for the life prediction of large structures, the simulation results are checked and corrected through the mechanical response test data, the crack propagation can be accurately simulated, the accuracy of the simulation results is improved, the influence of static load and fatigue load is considered in the physical test, the life prediction is more in line with the actual use conditions, according to the transfer coefficient between the sealed multi-cell steel structure material parameters and each test target, the test results of the scaled model are effectively transferred to the full-size structure model, the prediction error caused by the difference in structure size or loading conditions is avoided, the accuracy and reliability of the prediction are improved, and the crack propagation size and residual life of the sealed multi-cell steel structure under actual service conditions can be better reflected.

[0082] It should be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and the processor can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0083] It should also be understood that the memory in the embodiments of the present application can be volatile or nonvolatile memory, or can include both volatile and nonvolatile memory. The nonvolatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically EPROM (EEPROM), or flash memory. The volatile memory can be random access memory (RAM) used as external cache. By way of example, and not limitation, many forms of random access memory (RAM) are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0084] The above-described embodiments can be implemented in whole or in part by software, hardware (e.g., circuitry), firmware, or any combination thereof. When implemented in software, the above-described embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions according to the embodiments of the present application are entirely or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center through wired (e.g., infrared, wireless, microwave, etc.) or wireless means. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server, data center, etc. containing one or more available medium collections. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium can be a solid-state disk.

[0085] It should be understood that the term "and / or" herein merely describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone, where A and B can be singular or plural. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it, but it can also represent an "and / or" relationship, which can be understood in the context before and after it.

[0086] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or the like means any combination of the items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0087] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-described processes does not mean the order of execution, and the execution order of the processes should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0088] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0089] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the devices, apparatuses and units described above can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0090] In several embodiments provided by the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of units is only a logical function division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0091] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0092] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit.

[0093] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0094] The embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the service life prediction method of the sealed multi-cell steel structure.

[0095] The computer readable storage medium provided by the present application can realize the steps and effects of the service life prediction method of the sealed multi-cell steel structure of the above-mentioned method embodiment, and the present application will not be repeated here to avoid repetition.

[0096] The technical solutions provided by the embodiment of the present application have at least the following beneficial effects:

[0097] In the present application, by establishing a scaled structure, the demand for test site and equipment is effectively reduced, and the experimental cost is reduced. Under the limited loading capacity and test conditions, effective mechanical response test can still be carried out, which provides a realistic and feasible way for the service life prediction of large structures. The simulation results are checked and corrected through the mechanical response test data, the crack propagation can be accurately simulated, the accuracy of the simulation results is improved, the influence of static load and fatigue load is considered in the physical test, the service life prediction is more in line with the actual use conditions, the test results of the scaled model are effectively transferred to the full-size structure model according to the transfer coefficient between the material parameters of the sealed multi-cell steel structure and each test target, the prediction error caused by the difference in structure size or loading conditions is avoided, the accuracy and reliability of the prediction are improved, and the crack propagation size and residual life of the sealed multi-cell steel structure under actual service conditions can be better reflected.

[0098] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0099] The following points need to be explained:

[0100] (1) The drawings of the embodiments of the present application only involve the structures involved in the embodiments of the present application, and other structures can be referred to the general design.

[0101] (2) In the drawings used to describe the embodiments of the present application, the thickness of a layer or region is exaggerated or reduced for clarity, that is, the drawings are not drawn according to the actual proportion. It can be understood that when an element such as a layer, film, region or substrate is referred to as being located "on" or "under" another element, the element can be "directly" located on or under another element or there can be an intermediate element.

[0102] (3) In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0103] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for predicting the life of a closed multi-cell steel structure, characterized by, The method comprises the following steps: S1: taking the closed multi-cell steel structure as a prototype, determining a scaling ratio of the closed multi-cell steel structure based on a stiffness equivalence principle; S2: using a scaling plate, establishing a scaled structure of the closed multi-cell steel structure according to the scaling ratio, wherein the scaling plate is a thin plate material obtained by scaling the original plate of the closed multi-cell steel structure according to the scaling ratio; S3: performing a physical test on the scaling plate and the scaled structure under an equivalent service environment of the closed multi-cell steel structure, obtaining mechanical response test data of the scaled structure under a preset load, and determining test targets of the scaled structure at different times, wherein the test targets include a target welded structure crack propagation size and a target welded structure residual life; S4: taking scaling plate material data as input data, establishing a scaled structure simulation model of the scaled structure with the mechanical response test data as a target, and obtaining a transfer coefficient of the closed multi-cell steel structure material parameters in the scaled structure simulation model and each test target, wherein the transfer coefficient includes a crack propagation coefficient and a residual life change coefficient; S5: taking original plate material data as input data, and establishing a full-size structure simulation model of the closed multi-cell steel structure according to the transfer coefficient; S6: outputting the crack propagation size and the residual life of the target welded structure at different times under the full-size structure by using the full-size structure simulation model; wherein the preset load includes a static load and a fatigue load; the mechanical response test data includes mechanical response test data of the scaled structure under the static load and mechanical response test data of the scaled structure under the fatigue load; the mechanical response under the static load includes the overall deformation of the scaled structure, the overall stiffness value of the scaled structure, and the local stress value of the scaled structure; the mechanical response under the fatigue load includes the occurrence time of the fatigue crack and the propagation size of the fatigue crack.

2. The life prediction method of a closed multi-cell steel structure according to claim 1, characterized by, The scaling ratio of the closed multi-cell steel structure relative to the scaled structure is specifically 10:

1.

3. The life prediction method of a closed multi-cell steel structure according to claim 1, characterized by, The scaling plate includes a scaling structure base material and a scaling structure weld material.

4. The life prediction method of a closed multi-cell steel structure according to claim 1, characterized by, The physical test includes a tensile test, an expansion test, and a fracture toughness test.

5. A life prediction system for a closed multi-cell steel structure, characterized by, The method comprises the following steps: a processor; a memory having computer readable instructions stored thereon, wherein the computer readable instructions are executed by the processor to implement the life prediction method of the closed multi-cell steel structure according to any one of claims 1 to 4.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the life prediction method of the closed multi-cell steel structure according to any one of claims 1 to 4.

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