Rubber fatigue analysis method and device, terminal equipment and storage medium

Abstract

The invention discloses a rubber fatigue analysis method and device, terminal equipment and a storage medium. The method comprises the following steps: acquiring a finite element analysis model of rubber; in the finite element analysis model, a plurality of first-layer grid units located on the free surface of the axial symmetry area of the rubber loading shaft are selected; wherein the symmetric region of the rubber loading axis is a symmetric region divided by a finite element analysis model of rubber along a loading axis; based on a preset fatigue load, carrying out structural stress analysis on each first-layer grid unit to obtain a stress result corresponding to each first-layer grid unit; based on a stress result, performing a fatigue test on each first-layer grid unit to obtain fatigue data of each first-layer grid unit; and based on the fatigue data of each first-layer grid unit, obtaining a fatigue analysis result of the rubber. According to the method, the problem that the fatigue durability calculation result is inaccurate due to the fact that the stress position of the rubber structure is uncertain is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of simulation analysis, and in particular to a rubber fatigue analysis method, device, terminal equipment and storage medium. Background Art

[0002] In the calculation of existing suspension rubber structures, the number of fatigue cycles of the rubber structure under a specific load is the fatigue life of the structure. The principal stress of the entire surface of the suspension rubber structure under a specific load or a specific displacement is calculated by using the finite element method, and then the maximum equivalent stress of the rubber structure is calculated based on the principal stress. Finally, the fatigue life of the rubber structure is calculated by using the empirical formula. Since structural fatigue generally occurs on its free surface, the position of the principal stress of the existing suspension rubber structure during simulation is not on the free surface of the suspension rubber structure, resulting in inaccurate fatigue durability calculation results of the suspension rubber structure.

[0003] Therefore, a rubber fatigue analysis strategy is urgently needed to solve the problem of inaccurate fatigue durability calculation results of suspended rubber structures. Summary of the invention

[0004] The embodiments of the present invention provide a rubber fatigue analysis method, apparatus, terminal device and storage medium to solve the problem of inaccurate fatigue durability calculation results of a suspended rubber structure.

[0005] In order to solve the above problem, an embodiment of the present invention provides a rubber fatigue analysis method, comprising:

[0006] Obtaining a finite element analysis model of rubber;

[0007] In the finite element analysis model, a plurality of first-layer grid units located on the free surface of the symmetrical region of the rubber loading axis are selected; wherein the symmetrical region of the rubber loading axis is a symmetrical region divided by the finite element analysis model of the rubber along the loading axis;

[0008] Based on a preset fatigue load, a structural stress analysis is performed on each of the first-layer grid units to obtain a stress result corresponding to each of the first-layer grid units; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test; and the suspension road spectrum time series load changes with time;

[0009] Based on the stress result, performing a fatigue test on each of the first-layer mesh units to obtain fatigue data of each of the first-layer mesh units;

[0010] Based on the fatigue data of each of the first-layer grid cells, a fatigue analysis result of the rubber is obtained.

[0011] As an improvement of the above solution, the method of obtaining the finite element analysis model of the rubber includes:

[0012] Obtaining the geometric structure of the rubber;

[0013] Based on the symmetry data of the geometric structure, the geometric structure is segmented to obtain a plurality of geometrically symmetric monomers;

[0014] Performing three-dimensional scanning on the geometrically symmetrical monomer to obtain a three-dimensional grid monomer structure;

[0015] Based on the symmetry data, the three-dimensional grid monomer structure is replicated to obtain a finite element analysis model of the rubber.

[0016] As an improvement of the above solution, the geometrically symmetric monomer is a geometrically plane symmetric monomer, a geometrically axisymmetric monomer and a geometrically complex symmetric monomer; based on the symmetry data of the geometric structure, the geometric structure is segmented to obtain a plurality of geometrically symmetric monomers, including:

[0017] Acquire symmetry data of the geometric structure; wherein the symmetry data includes: a symmetry plane and a symmetry axis;

[0018] When the symmetry data is a symmetry plane, based on a first number of the symmetry planes, the geometric structure is divided into a plurality of geometrically symmetrical monomers; wherein the number of the geometrically symmetrical monomers is twice the first number;

[0019] When the symmetry data is a symmetry axis, based on a second number of the symmetry axes, the geometric structure is divided into a plurality of geometric axis symmetric monomers; wherein the number of the geometric axis symmetric monomers is four times the second number;

[0020] When the symmetry data is a symmetry axis and a symmetry plane, the geometric structure is divided along the symmetry axis to obtain four geometric intermediate monomers, and the four geometric intermediate monomers are divided along the symmetry plane to obtain eight geometric composite symmetry monomers.

[0021] As an improvement of the above solution, the fatigue test is performed on each of the first-layer mesh units based on the stress result to obtain fatigue data of each of the first-layer mesh units, including:

[0022] Obtaining mechanical behavior data and fatigue curves of standard-sized solid samples of the rubber;

[0023] The material parameters of each first-layer mesh unit are set according to the mechanical behavior data, and based on the fatigue curve and the stress result, a fatigue test is performed on each first-layer mesh unit after the material parameters are set, so as to obtain the number of stress cycles and the number of fatigue cycles under each stress of each first-layer mesh unit after the material parameters are set;

[0024] Based on the stress cycle number and the fatigue cycle number, the fatigue damage value within a single fatigue cycle and the single fatigue cycle number of each first-layer grid unit under each stress are obtained; wherein the fatigue data includes: the fatigue damage value within a single fatigue cycle and the single fatigue cycle number.

[0025] As an improvement of the above solution, the step of obtaining the mechanical behavior data and fatigue curve of the physical sample of the rubber includes:

[0026] Performing a tensile test on a standard-sized physical sample of the rubber to obtain the rubber elastic modulus, ultimate tensile stress, and yield strength; wherein the mechanical behavior data includes: the rubber elastic modulus, ultimate tensile stress, and yield strength;

[0027] A fatigue test is performed on a standard-sized solid sample of the rubber under different equal-amplitude symmetrical stresses to obtain the number of fatigue cycles corresponding to each stress, and a fatigue curve is generated according to the number of fatigue cycles corresponding to each stress.

[0028] As an improvement of the above solution, the fatigue analysis result of the rubber is obtained based on the fatigue data of each of the first-layer grid cells, including:

[0029] According to the fatigue damage value in a single fatigue cycle and the number of single fatigue cycles under each stress of each first-layer grid unit, symmetric mapping is performed along the loading axis of the finite element analysis model to obtain the fatigue analysis result of the rubber.

[0030] As an improvement of the above solution, after obtaining the fatigue analysis result of the rubber, the method further includes:

[0031] Obtain the preset design fatigue cycle number and design fatigue cycle number;

[0032] In each axially symmetrical region of rubber loading, based on the design fatigue cycle number, the design fatigue cycle number, the fatigue damage value in a single fatigue cycle under each stress of each first-layer mesh unit, and the fatigue cycle number, the fatigue damage value and safety factor are calculated for each first-layer mesh unit;

[0033] When the fatigue damage value is less than the fatigue damage threshold and the safety factor is greater than the safety factor threshold, the simulation ends;

[0034] When the fatigue damage value is greater than or equal to the fatigue damage threshold and the safety factor is less than or equal to the safety factor threshold, the structure of the current first-layer network unit is optimized.

[0035] Accordingly, an embodiment of the present invention further provides a rubber fatigue analysis device, comprising: a data acquisition module, a data selection module, a data analysis module, a data testing module and a result generation module;

[0036] The data acquisition module is used to obtain a finite element analysis model of the rubber;

[0037] The data selection module is used to select a number of first-layer grid units located on the free surface of the rubber loading axis symmetric region in the finite element analysis model; wherein the rubber loading axis symmetric region is a symmetric region divided by the finite element analysis model of the rubber along the loading axis;

[0038] The data analysis module is used to perform structural stress analysis on each of the first-layer grid cells based on a preset fatigue load to obtain a stress result corresponding to each of the first-layer grid cells; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test;

[0039] The data testing module is used to perform fatigue testing on each of the first-layer grid units based on the stress result to obtain fatigue data of each of the first-layer grid units;

[0040] The result generating module is used to obtain the fatigue analysis result of the rubber based on the fatigue data of each of the first layer grid cells.

[0041] Correspondingly, an embodiment of the present invention further provides a computer terminal device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a rubber fatigue analysis method as described in the present invention is implemented.

[0042] Correspondingly, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute a rubber fatigue analysis method as described in the present invention.

[0043] As can be seen from the above, the present invention has the following beneficial effects:

[0044] The present invention provides a rubber fatigue analysis method, which obtains a finite element analysis model of rubber; in the finite element analysis model, selects a plurality of first-layer grid units located on the free surface of the rubber loading axisymmetric region; wherein the rubber loading axisymmetric region is a symmetric region divided by the finite element analysis model of the rubber along the loading axis; based on a preset fatigue load, performs a structural stress analysis on each of the first-layer grid units to obtain a stress result corresponding to each of the first-layer grid units; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test; the suspension road spectrum time series load changes with time; based on the stress result, performs a fatigue test on each of the first-layer grid units to obtain fatigue data of each of the first-layer grid units; based on the fatigue data of each of the first-layer grid units, obtains a fatigue analysis result of the rubber. The present invention studies the free surface of the symmetrical area divided by the rubber finite element analysis model along the rubber loading axis, sets the fatigue load on the free surface of the symmetrical area to perform stress analysis and fatigue testing, so that when the rubber is subjected to fatigue simulation testing, the load analysis is limited to the surface of the finite element analysis model, solving the problem of inaccurate fatigue durability calculation results of the rubber structure due to uncertain stress position. At the same time, the present application greatly reduces the amount of simulation data by studying the free surface of the symmetrical area divided by the rubber finite element analysis model along the rubber loading axis, and improves the efficiency of fatigue durability calculation of the rubber structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic flow chart of a rubber fatigue analysis method provided by one embodiment of the present invention;

[0046] Figure 2 is a structural schematic diagram of a rubber fatigue analysis device provided by an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of the structure of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Embodiment 1

[0050] See also Figure 1 , Figure 1 FIG. 1 is a flow chart of a rubber fatigue analysis method provided by an embodiment of the present invention. Figure 1 As shown, this embodiment includes steps 101 to 105, and each step is specifically as follows:

[0051] Step 101: Obtain a finite element analysis model of rubber.

[0052] In this embodiment, obtaining the finite element analysis model of the rubber includes:

[0053] Obtaining the geometric structure of the rubber;

[0054] Based on the symmetry data of the geometric structure, the geometric structure is segmented to obtain a plurality of geometrically symmetric monomers;

[0055] Performing three-dimensional scanning on the geometrically symmetrical monomer to obtain a three-dimensional grid monomer structure;

[0056] Based on the symmetry data, the three-dimensional grid monomer structure is replicated to obtain a finite element analysis model of the rubber.

[0057] In this embodiment, the geometrically symmetrical monomers are geometrically plane symmetrical monomers, geometrically axisymmetric monomers and geometrically complex symmetrical monomers; based on the symmetry data of the geometric structure, the geometric structure is segmented to obtain a plurality of geometrically symmetrical monomers, including:

[0058] Acquire symmetry data of the geometric structure; wherein the symmetry data includes: a symmetry plane and a symmetry axis;

[0059] When the symmetry data is a symmetry plane, based on a first number of the symmetry planes, the geometric structure is divided into a plurality of geometrically symmetrical monomers; wherein the number of the geometrically symmetrical monomers is twice the first number;

[0060] When the symmetry data is a symmetry axis, based on a second number of the symmetry axes, the geometric structure is divided into a plurality of geometric axis symmetric monomers; wherein the number of the geometric axis symmetric monomers is four times the second number;

[0061] When the symmetry data is a symmetry axis and a symmetry plane, the geometric structure is divided along the symmetry axis to obtain four geometric intermediate monomers, and the four geometric intermediate monomers are divided along the symmetry plane to obtain eight geometric composite symmetry monomers.

[0062] In a specific embodiment, according to the symmetry of the suspension rubber geometric structure, the suspension rubber structure is divided into several symmetrical parts along its geometric symmetry plane, and different numbers are determined for different structures. For example, if the rubber geometric structure is plane-symmetrical, if it has only one symmetry plane, it is cut into two parts along the symmetry plane; if it has two symmetry planes, it is cut into four parts along the two symmetry planes; for a rubber structure with compound symmetry (having both axial symmetry and plane symmetry), it is first cut into four identical parts along the symmetry axis, and then the four parts are cut into eight parts along the symmetry plane.

[0063] It can be understood that a symmetrical part is taken for 3D mesh division to generate a 3D mesh structure, and the 3D mesh structure is mapped and merged along the symmetry plane of the suspension rubber to obtain the overall 3D mesh structure of the suspension rubber structure. The loading point of the rubber load is established at the elastic center of the rubber, and a full degree of freedom constraint is established at the mesh boundary of the rubber to obtain a complete finite element analysis model of the suspension rubber structure. Here, a 3D scan is performed based on a small part to construct a mesh structure, so that a complete finite element analysis model of the suspension rubber structure can be newly constructed with a smaller amount of data.

[0064] Step 102: In the finite element analysis model, select a plurality of first-layer mesh units located on the free surface of the symmetrical region of the rubber loading axis; wherein the symmetrical region of the rubber loading axis is a symmetrical region divided by the finite element analysis model of the rubber along the loading axis.

[0065] In this embodiment, in the finite element analysis model, the first layer of mesh units of the free surface of the suspension rubber loading axisymmetric area is selected, and these first layer of mesh units are used to create a mesh unit set U for fatigue durability analysis. Multiple analysis steps are set, and each analysis step cannot be postponed, and the maximum fatigue loads in different directions are loaded respectively.

[0066] Step 103: Based on the preset fatigue load, perform structural stress analysis on each of the first-layer grid units to obtain stress results corresponding to each of the first-layer grid units; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test; and the suspension road spectrum time series load changes with time.

[0067] In this embodiment, this embodiment performs stress analysis calculation of the suspension rubber structure, obtains stress results of all grids in the grid unit set U, and exports the finite element result file. Stress analysis method: first determine the relationship between the displacement in the grid unit and the node displacement by the finite element grid model, and obtain the stiffness matrix of the overall structure, then apply a load to the loading point of the rubber, calculate the strain of the rubber under the load, and then multiply the rubber strain by the elastic modulus of the rubber to calculate the stress of the rubber structure under the load.

[0068] It should be noted that in order to make the fatigue durability calculation consistent with the vehicle road test results, the suspension rubber is loaded with the suspension road spectrum time series load collected from the vehicle road test to evaluate the durability life of the suspension rubber on the vehicle.

[0069] Step 104: Based on the stress result, a fatigue test is performed on each of the first-layer mesh units to obtain fatigue data of each of the first-layer mesh units.

[0070] In this embodiment, the fatigue test is performed on each of the first-layer mesh units based on the stress result to obtain fatigue data of each of the first-layer mesh units, including:

[0071] Obtaining mechanical behavior data and fatigue curves of standard-sized solid samples of the rubber;

[0072] The material parameters of each first-layer mesh unit are set according to the mechanical behavior data, and based on the fatigue curve and the stress result, a fatigue test is performed on each first-layer mesh unit after the material parameters are set, so as to obtain the number of stress cycles and the number of fatigue cycles under each stress of each first-layer mesh unit after the material parameters are set;

[0073] Based on the stress cycle number and the fatigue cycle number, the fatigue damage value within a single fatigue cycle and the single fatigue cycle number of each first-layer grid unit under each stress are obtained; wherein the fatigue data includes: the fatigue damage value within a single fatigue cycle and the single fatigue cycle number.

[0074] In this embodiment, the step of obtaining the mechanical behavior data and fatigue curve of the physical sample of the rubber includes:

[0075] Performing a tensile test on a standard-sized physical sample of the rubber to obtain the rubber elastic modulus, ultimate tensile stress, and yield strength; wherein the mechanical behavior data includes: the rubber elastic modulus, ultimate tensile stress, and yield strength;

[0076] A fatigue test is performed on a standard-sized solid sample of the rubber under different equal-amplitude symmetrical stresses to obtain the number of fatigue cycles corresponding to each stress, and a fatigue curve is generated according to the number of fatigue cycles corresponding to each stress.

[0077] It can be understood that by conducting a tensile test on a standard-sized specimen of a rubber entity sample, the mechanical behavior data of the rubber during the tensile process, including material parameters such as rubber elastic modulus, ultimate tensile stress, and yield strength, are obtained; at the same time, a fatigue test is conducted on a standard-sized specimen of a rubber entity sample under different equal-amplitude symmetrical stresses to obtain the number of fatigue cycles N under different stresses S, thereby obtaining the suspended rubber segmented SN curve of the material. Import the fatigue load and edit the loading sequence, set the rubber material properties, including the elastic modulus, ultimate tensile stress, yield strength and other material properties of the rubber and the suspended rubber segmented SN fatigue curve, and set the fatigue load analysis object to the grid unit set U.

[0078] In a specific embodiment, solving the single cycle fatigue damage value and fatigue cycle number (lifespan) of all cells in the grid cell set U includes the following steps:

[0079] 1. Obtain the fatigue damage value of a single cycle: first count the number of stress cycles n in a single fatigue cycle, and obtain the corresponding fatigue cycle number N of the rubber under the stress according to the rubber SN curve, then the fatigue damage value under a certain stress in a single cycle = stress cycle number n / fatigue cycle number N, and count the fatigue damage value under each stress in a single cycle in the above manner, and finally add up the fatigue damage values ​​under each stress to obtain the fatigue damage value in a single fatigue cycle; 2. Obtain the number of single fatigue cycles: single fatigue cycle number = 1 / single cycle fatigue damage value; and write the calculation results into the finite element file, and then perform symmetrical mapping along the loading axis to obtain the fatigue life and damage distribution of the entire suspension rubber structure. 3. Symmetric mapping: In step (3), the grid unit set U for fatigue durability analysis is selected, but U is not a free grid of the entire rubber structure surface. Instead, one of the symmetric regions is selected for fatigue durability calculation based on the symmetry of the rubber structure along the loading axis. Therefore, the calculation region is only half of the entire rubber free surface. Therefore, it is necessary to symmetrically map the calculated region along the loading axis to obtain the fatigue distribution of the entire rubber free surface. In this way, the fatigue analysis results of the entire suspension rubber structure can be obtained with a smaller amount of calculation data and a faster calculation speed.

[0080] Step 105: Obtain fatigue analysis results of the rubber based on fatigue data of each of the first-layer grid cells.

[0081] In this embodiment, obtaining the fatigue analysis result of the rubber based on the fatigue data of each first-layer grid unit includes:

[0082] According to the fatigue damage value in a single fatigue cycle and the number of single fatigue cycles under each stress of each first-layer grid unit, symmetric mapping is performed along the loading axis of the finite element analysis model to obtain the fatigue analysis result of the rubber.

[0083] In this embodiment, after obtaining the fatigue analysis result of the rubber, the method further includes:

[0084] Obtain the preset design fatigue cycle number and design fatigue cycle number;

[0085] In each axially symmetrical region of rubber loading, based on the design fatigue cycle number, the design fatigue cycle number, the fatigue damage value in a single fatigue cycle under each stress of each first-layer mesh unit, and the fatigue cycle number, the fatigue damage value and safety factor are calculated for each first-layer mesh unit;

[0086] When the fatigue damage value is less than the fatigue damage threshold and the safety factor is greater than the safety factor threshold, the simulation ends;

[0087] When the fatigue damage value is greater than or equal to the fatigue damage threshold and the safety factor is less than or equal to the safety factor threshold, the structure of the current first-layer network unit is optimized.

[0088] In a specific embodiment, the fatigue damage value is calculated as follows: fatigue damage value = single cycle fatigue damage value * designed fatigue cycle number; safety factor: safety factor = fatigue cycle number / designed fatigue cycle number;

[0089] Determine whether the conditions are met: assume that the fatigue damage value is less than 1 (i.e., the fatigue damage threshold of the present invention) and the safety factor is greater than 1 (i.e., the safety factor threshold of the present invention);

[0090] If the condition is not met, the suspension rubber structure in the area where the design fatigue damage value is ≥1 and the safety factor is ≤1 is optimized, and the rubber fatigue analysis method of the present invention is repeatedly performed;

[0091] If the conditions are met, the simulation analysis ends.

[0092] See also Figure 2 , Figure 2 It is a structural schematic diagram of a rubber fatigue analysis device provided by an embodiment of the present invention, comprising: a data acquisition module 201, a data selection module 202, a data analysis module 203, a data testing module 204 and a result generation module 205;

[0093] The data acquisition module is used to obtain a finite element analysis model of the rubber;

[0094] The data selection module is used to select a number of first-layer grid units located on the free surface of the rubber loading axis symmetric region in the finite element analysis model; wherein the rubber loading axis symmetric region is a symmetric region divided by the finite element analysis model of the rubber along the loading axis;

[0095] The data analysis module is used to perform structural stress analysis on each of the first-layer grid cells based on a preset fatigue load to obtain a stress result corresponding to each of the first-layer grid cells; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test;

[0096] The data testing module is used to perform fatigue testing on each of the first-layer grid units based on the stress result to obtain fatigue data of each of the first-layer grid units;

[0097] The result generating module is used to obtain the fatigue analysis result of the rubber based on the fatigue data of each of the first layer grid cells.

[0098] It can be understood that the above-mentioned system embodiment corresponds to the method embodiment of the present invention, and can implement the rubber fatigue analysis method provided by any one of the above-mentioned method embodiments of the present invention.

[0099] In this embodiment, when calculating the fatigue of the suspension rubber structure, the symmetry of the suspension rubber structure is first used to generate a complete 3D grid structure, and the principal stress of the suspension rubber structure under the maximum fatigue load or displacement is calculated. In order to make the simulation calculation more consistent with the bench test results, the principal stress is converted into an equivalent stress on the rubber segmented SN curve obtained from the test, and the fatigue life and damage value of the suspension rubber are calculated through the SN curve, and a fatigue life distribution cloud map and a fatigue damage distribution cloud map are generated; in order to make the fatigue endurance calculation consistent with the vehicle road test results, the suspension rubber is loaded with the SN curve collected by the vehicle road test. The suspension road spectrum time series load is used to evaluate the durability life of the suspension rubber on the whole vehicle. At the same time, according to the symmetry of the suspension structure, the fatigue calculation results of the symmetrical area along its loading axis are consistent. According to this symmetry, the grid cells on the free surface of the symmetrical area of ​​the suspension rubber are selected as the fatigue durability calculation grid cell set U. The durability results of the set U are obtained first, and then symmetrical mapping is performed along the loading axis to obtain the fatigue life and damage distribution of the entire rubber structure. This can reduce the area of ​​the fatigue calculation area and the corresponding number of grid cells, shorten the calculation time, and improve the calculation efficiency.

[0100] Embodiment 2

[0101] See also Figure 3 , Figure 3 It is a schematic diagram of the structure of a terminal device provided in one embodiment of the present invention.

[0102] A terminal device of this embodiment includes: a processor 301, a memory 302, and a computer program stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program, the steps of the above-mentioned rubber fatigue analysis method in the embodiment are implemented, for example: Figure 1 Alternatively, when the processor executes the computer program, the functions of each module in the above-mentioned device embodiments are realized, for example: Figure 2 All modules of the rubber fatigue analysis device are shown.

[0103] In addition, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the rubber fatigue analysis method described in any of the above embodiments.

[0104] Those skilled in the art will understand that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0105] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 301 is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0106] The memory 302 can be used to store the computer program and / or module. The processor 301 implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory 302. The memory 302 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0107] Wherein, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0108] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0109] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A rubber fatigue analysis method, characterized in that: include: Obtain a finite element analysis model of rubber; In the finite element analysis model, a plurality of first-layer grid units located on the free surface of the symmetrical region of the rubber loading axis are selected; wherein the symmetrical region of the rubber loading axis is a symmetrical region divided by the finite element analysis model of the rubber along the loading axis; Based on a preset fatigue load, a structural stress analysis is performed on each of the first-layer grid units to obtain a stress result corresponding to each of the first-layer grid units; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test; and the suspension road spectrum time series load changes with time; Based on the stress result, performing a fatigue test on each of the first-layer mesh units to obtain fatigue data of each of the first-layer mesh units; Based on the fatigue data of each of the first-layer grid cells, a fatigue analysis result of the rubber is obtained.

2. The rubber fatigue analysis method according to claim 1, characterized in that: The step of obtaining the finite element analysis model of the rubber comprises: Obtaining the geometric structure of the rubber; Based on the symmetry data of the geometric structure, the geometric structure is segmented to obtain a plurality of geometrically symmetric monomers; Performing three-dimensional scanning on the geometrically symmetrical monomer to obtain a three-dimensional grid monomer structure; Based on the symmetry data, the three-dimensional grid monomer structure is replicated to obtain a finite element analysis model of the rubber.

3. The rubber fatigue analysis method according to claim 2, characterized in that: The geometrically symmetrical monomers are geometrically plane symmetrical monomers, geometrically axisymmetric monomers and geometrically complex symmetrical monomers; based on the symmetry data of the geometric structure, the geometric structure is segmented to obtain a plurality of geometrically symmetrical monomers, including: Acquire symmetry data of the geometric structure; wherein the symmetry data includes: a symmetry plane and a symmetry axis; When the symmetry data is a symmetry plane, based on a first number of the symmetry planes, the geometric structure is divided into a plurality of geometrically symmetrical monomers; wherein the number of the geometrically symmetrical monomers is twice the first number; When the symmetry data is a symmetry axis, based on a second number of the symmetry axes, the geometric structure is divided into a plurality of geometric axis symmetric monomers; wherein the number of the geometric axis symmetric monomers is four times the second number; When the symmetry data is a symmetry axis and a symmetry plane, the geometric structure is divided along the symmetry axis to obtain four geometric intermediate monomers, and the four geometric intermediate monomers are divided along the symmetry plane to obtain eight geometric composite symmetry monomers.

4. The rubber fatigue analysis method according to claim 3, characterized in that: The step of performing fatigue testing on each of the first-layer mesh units based on the stress result to obtain fatigue data of each of the first-layer mesh units includes: Obtaining mechanical behavior data and fatigue curves of standard-sized solid samples of the rubber; The material parameters of each first-layer mesh unit are set according to the mechanical behavior data, and based on the fatigue curve and the stress result, a fatigue test is performed on each first-layer mesh unit after the material parameters are set, so as to obtain the number of stress cycles and the number of fatigue cycles under each stress of each first-layer mesh unit after the material parameters are set; Based on the stress cycle number and the fatigue cycle number, the fatigue damage value within a single fatigue cycle and the single fatigue cycle number of each first-layer grid unit under each stress are obtained; wherein the fatigue data includes: the fatigue damage value within a single fatigue cycle and the single fatigue cycle number.

5. The rubber fatigue analysis method according to claim 4, characterized in that: The step of obtaining the mechanical behavior data and fatigue curve of the physical sample of the rubber includes: Performing a tensile test on a standard-sized physical sample of the rubber to obtain the rubber elastic modulus, ultimate tensile stress, and yield strength; wherein the mechanical behavior data includes: the rubber elastic modulus, ultimate tensile stress, and yield strength; A fatigue test is performed on a standard-sized solid sample of the rubber under different equal-amplitude symmetrical stresses to obtain the number of fatigue cycles corresponding to each stress, and a fatigue curve is generated according to the number of fatigue cycles corresponding to each stress.

6. The rubber fatigue analysis method according to claim 4, characterized in that: The step of obtaining the fatigue analysis result of the rubber based on the fatigue data of each of the first-layer grid cells includes: According to the fatigue damage value in a single fatigue cycle and the number of single fatigue cycles under each stress of each first-layer grid unit, symmetric mapping is performed along the loading axis of the finite element analysis model to obtain the fatigue analysis result of the rubber.

7. The rubber fatigue analysis method according to claim 6, characterized in that: After obtaining the fatigue analysis result of the rubber, the method further includes: Obtain the preset design fatigue cycle number and design fatigue cycle number; In each axially symmetrical region of rubber loading, based on the design fatigue cycle number, the design fatigue cycle number, the fatigue damage value in a single fatigue cycle under each stress of each first-layer mesh unit, and the fatigue cycle number, the fatigue damage value and safety factor are calculated for each first-layer mesh unit; When the fatigue damage value is less than the fatigue damage threshold and the safety factor is greater than the safety factor threshold, the simulation ends; When the fatigue damage value is greater than or equal to the fatigue damage threshold and the safety factor is less than or equal to the safety factor threshold, the structure of the current first-layer network unit is optimized.

8. A rubber fatigue analysis device, characterized in that: include: Data acquisition module, data selection module, data analysis module, data testing module and result generation module; The data acquisition module is used to obtain a finite element analysis model of the rubber; The data selection module is used to select a number of first-layer grid units located on the free surface of the rubber loading axis symmetric region in the finite element analysis model; wherein the rubber loading axis symmetric region is a symmetric region divided by the finite element analysis model of the rubber along the loading axis; The data analysis module is used to perform structural stress analysis on each of the first-layer grid cells based on a preset fatigue load to obtain a stress result corresponding to each of the first-layer grid cells; wherein the fatigue load is a suspension road spectrum time series load collected during a vehicle road test; The data testing module is used to perform fatigue testing on each of the first-layer grid units based on the stress result to obtain fatigue data of each of the first-layer grid units; The result generating module is used to obtain the fatigue analysis result of the rubber based on the fatigue data of each of the first layer grid cells.

9. A computer terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements a rubber fatigue analysis method as claimed in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute a rubber fatigue analysis method according to any one of claims 1 to 7.

Images