Method for analyzing wheel disc strength

Abstract

The application provides a wheel disc strength analysis method, relates to the technical field of wheel disc analysis, and comprises the following steps: acquiring a plurality of initial epoxy resin test pieces corresponding to a wheel disc and calibration stripe data corresponding to the initial epoxy resin test pieces; performing load experiments on the plurality of initial epoxy resin test pieces based on different single working conditions respectively to obtain target epoxy resin test pieces after the load experiments; uniformly performing sector division on the target epoxy resin test pieces according to the total number of blade root grooves, selecting a target sector, perforating and sampling multiple regions of the target sector, acquiring a plurality of cylindrical samples, and performing multiple slice sampling on the cylindrical samples to obtain a plurality of target slices; performing photoelastic experiments on the target slices of any target epoxy resin test piece respectively to obtain experimental data, and obtaining comparison results of the experimental data and the calibration stripe data; and collating and analyzing all the comparison results to obtain a strength analysis result of the wheel disc. The strength analysis result of the wheel disc is accurately obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheel disc analysis, in particular to a wheel disc strength analysis method. BACKGROUND

[0002] The wheel disc is an important component of a modern heavy gas turbine. For a heavy gas turbine with high power, the working conditions of the wheel disc have the characteristics of high temperature and complex load change, which puts forward strict requirements on the design, manufacturing and installation of the wheel disc. Therefore, it is of great significance to analyze the strength of the wheel disc to ensure the safe operation of the wheel disc under different working conditions and reduce the operation and maintenance cost of related production enterprises.

[0003] At present, the contact measurement method is often used for strength test of the wheel disc in engineering application, but the sensor needs to be arranged on the measured object, and problems such as difficulty in testing three-dimensional strain field, anti-electromagnetic interference of the test system and change of dynamic characteristics of the measured object caused by contact measurement often occur. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art.

[0005] To this end, one object of the present application is to provide a wheel disc strength analysis method, which comprises the following steps: obtaining a plurality of initial epoxy resin test pieces corresponding to a wheel disc, and obtaining calibration stripe data corresponding to the initial epoxy resin test pieces, wherein the wheel disc is a rotational symmetric structure and comprises a plurality of blade root grooves; performing a load experiment on each of the plurality of initial epoxy resin test pieces based on a different single working condition, obtaining a plurality of target epoxy resin test pieces obtained after the load experiment, and the initial epoxy resin test pieces correspond one-to-one to the single working conditions; uniformly dividing the target epoxy resin test pieces into sectors according to the total number of the blade root grooves, and selecting one of the sectors as a target sector, wherein the target sector contains at least one blade root groove, and the blade root grooves in the target sector are all in a complete state; punching and sampling a plurality of regions of the target sector, obtaining a plurality of cylindrical samples obtained by punching and sampling, and performing multiple slice sampling on each cylindrical sample to obtain a plurality of target slices corresponding to the target epoxy resin test piece; for any target epoxy resin test piece, performing an optical elasticity experiment on the target slices corresponding to the target epoxy resin test piece, obtaining experimental data obtained by the optical elasticity experiment, comparing the experimental data with the calibration stripe data, and obtaining a comparison result of the target epoxy resin test piece; and collating and analyzing the comparison results corresponding to all the target epoxy resin test pieces to obtain a strength analysis result of the wheel disc.

[0006] According to one embodiment of the present application, the target epoxy resin test piece is uniformly divided into sectors according to the total number of blade root grooves, including: obtaining the total number of blade root grooves of the wheel disc; determining the number of sectors for sector division according to the total number of blade root grooves; uniformly dividing the target epoxy resin test piece into sectors according to the number of sectors, wherein each sector after division contains blade root grooves in a complete state.

[0007] According to one embodiment of the present application, when the target sector is punched and sampled at multiple regions, the punch diameter is not more than 1mm.

[0008] According to one embodiment of the present application, when each cylindrical sample is sampled by multiple slicing, the slicing thickness is not more than 1mm.

[0009] According to one embodiment of the present application, a plurality of initial epoxy resin test pieces are subjected to load experiments based on different single working conditions, and a plurality of target epoxy resin test pieces obtained after the load experiments are obtained, including: designing a plurality of different single working conditions based on different temperature loads, wheel disc rotation speeds and pre-tightening torque; performing load experiments on a plurality of initial epoxy resin test pieces based on different single working conditions, and obtaining a plurality of target epoxy resin test pieces obtained after the load experiments.

[0010] According to one embodiment of the present application, the target sector is punched and sampled at multiple regions, and a plurality of cylindrical samples obtained by punching and sampling are obtained, including: selecting multiple regions at different distances from the sector center in the target sector; punching and sampling the multiple regions to obtain a plurality of cylindrical samples obtained by punching and sampling.

[0011] According to one embodiment of the present application, the target epoxy resin test piece corresponds to a target slice, and the target slice is subjected to photoelasticity experiment, and experimental data obtained by the photoelasticity experiment are obtained, including: placing each target slice in a laser polarized light field for photoelasticity experiment, and recording the light path image in the laser polarized light field; processing and analyzing the light path image to obtain the full-field shear stress distribution and the principal stress trace of the light path image; and taking the full-field shear stress distribution and the principal stress trace as experimental data.

[0012] According to one embodiment of the present application, a plurality of initial epoxy resin test pieces corresponding to the wheel disc are obtained, including: proportionally reducing the size of the wheel disc to obtain the size characteristics of the measured wheel disc model; based on the size characteristics, printing a plurality of measured wheel disc models based on 3D printing; using silicone as a mold, taking the measured wheel disc model as a core mold, pouring silicone to wrap the entire measured wheel disc model, and after the silicone is solidified, injecting epoxy resin into the negative mold space to obtain the initial epoxy resin test piece.

[0013] According to one embodiment of the present application, the calibration stripe data corresponding to the initial epoxy resin test piece is obtained, comprising: using a single cantilever to calibrate the stress of the initial epoxy resin test piece, and determining the stress stripe value and the strain stripe value of the initial epoxy resin test piece; and taking the stress stripe value and the strain stripe value as the calibration stripe data.

[0014] The present application at least realizes the following beneficial effects:

[0015] (1) The wheel disc strength analysis method proposed in the present application overcomes the shortcomings of the existing contact type wheel disc strength analysis method, such as large difficulty in three-dimensional strain field measurement, many electromagnetic interference signals, and dynamic characteristics of the measured object, and the actual running load of the wheel disc is taken as a boundary condition to test the wheel disc model, so that accurate stress analysis results are obtained.

[0016] (2) The wheel disc strength analysis method proposed in the present application can effectively reduce the construction cost or modification cost of the test bench, and by making epoxy resin test pieces, the size of the wheel disc is modeled, and the test cost is reduced.

[0017] (3) The wheel disc strength analysis method proposed in the present application can obtain the wheel disc internal stress distribution test results that are difficult to obtain by traditional analysis methods, reduce the measurement error, and obtain more reliable strength analysis results. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a schematic diagram of an exemplary embodiment of a wheel disc strength analysis method according to one embodiment of the present application.

[0020] Figure 2 is a schematic diagram of selecting a target sector according to one embodiment of the present application.

[0021] Figure 3 is a schematic diagram of punching and sampling multiple regions of the target sector according to one embodiment of the present application.

[0022] Figure 4 is a schematic diagram of an exemplary embodiment of a wheel disc strength analysis method according to one embodiment of the present application.

[0023] Figure 5 is a schematic diagram of a laser polarized light field according to one embodiment of the present application. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0025] Figure 1 is a schematic diagram of an exemplary embodiment of a wheel disc strength analysis method shown in the present application, as shown in Figure 1 the wheel disc strength analysis method comprises the following steps:

[0026] S101, a plurality of initial epoxy resin test pieces corresponding to the wheel disc are obtained, and calibration fringe data corresponding to the initial epoxy resin test pieces are obtained, wherein the wheel disc is a rotational symmetrical structure and contains a plurality of blade root grooves.

[0027] Since the wheel disc is generally large in size, a large cost is required to build a test bench directly for testing. In order to facilitate the development of test research based on the existing test bench, the to-be-tested wheel disc is made into a scaled-down model according to the size of the existing test bench, and the geometric feature size of the model is determined.

[0028] The wheel disc has relatively simple geometric shape, and a high-precision model can be made by 3D printing. The model made by this method can accurately restore the structural characteristics of the to-be-tested wheel disc.

[0029] Silica gel is used as a mold, and the to-be-tested wheel disc model is used as a core mold. The silica gel is poured to wrap the entire to-be-tested wheel disc model. Since the silica gel has good forming characteristics, it is suitable for making the to-be-tested wheel disc test piece. After the silica gel is solidified, the epoxy resin is injected into the negative space to obtain the initial epoxy resin test piece of the to-be-tested wheel disc.

[0030] The calibration sample is made of the same batch of epoxy resin as the initial epoxy resin test piece of the to-be-tested wheel disc. The single-arm beam is used to calibrate the calibration sample to determine the stress fringe value and strain fringe value of the initial epoxy resin test piece as the calibration fringe data.

[0031] S102, a plurality of initial epoxy resin test pieces are subjected to load experiments based on different single working conditions respectively, and a plurality of target epoxy resin test pieces obtained after the load experiments are obtained, and the initial epoxy resin test pieces correspond to the single working conditions one by one.

[0032] The initial epoxy resin test piece made of epoxy resin is subjected to modeling test. When designing the modeling test, many factors such as model scale, load ratio, test bench condition and the like in the test need to be considered. Different temperature loads, wheel disc speeds and pre-tightening torque correspond to different working conditions in the actual operation process, so as to simulate the stress condition of the wheel disc under different working conditions.

[0033] According to the modeling test scheme, the load test is performed on the initial epoxy resin test piece, and the epoxy resin test piece obtained after the load test is taken as the target epoxy resin test piece to be analyzed. Each initial epoxy resin test piece can only be tested under a single working condition to ensure less influence between stress stripes and reduce errors in the analysis of test results.

[0034] S103, uniformly sector-dividing the target epoxy resin test piece according to the total number of blade root grooves, and selecting one sector as a target sector, wherein the target sector contains at least one blade root groove, and the blade root grooves on the target sector are in a complete state.

[0035] Because the wheel disc is large in size and has a rotationally symmetrical structure, the k / a sectors are cut for block segmentation to study the overall stress condition. Because of the existence of the blade root grooves on the wheel disc, the complete blade grooves should be retained to obtain the stress distribution of the blade root groove area, wherein k is a natural number, and a is the total number of blade root grooves of the wheel disc.

[0036] Figure 2 is a schematic diagram of selecting a target sector shown in the present application, as shown in Figure 2 the target epoxy resin test piece is uniformly sector-divided, and one sector is selected as a target sector.

[0037] S104, punching sampling is performed on multiple regions of the target sector, multiple cylindrical samples obtained by punching sampling are obtained, and multiple target slices corresponding to the target epoxy resin test piece are obtained by slicing sampling on each cylindrical sample multiple times.

[0038] The target sector after block segmentation is still large and is not easy to observe by slicing, and needs to be punched and sampled, Figure 3 is a schematic diagram of punching sampling on multiple regions of a target sector shown in the present application, as shown in Figure 3 punching sampling is performed on multiple regions of the target sector, and multiple cylindrical samples obtained by punching sampling are obtained. After obtaining the cylindrical samples, multiple target slices corresponding to the target epoxy resin test piece are obtained by slicing sampling on each cylindrical sample multiple times.

[0039] In the present application, when punching sampling is performed on multiple regions of the target sector, the punching diameter is not more than 1 mm.

[0040] In the present application, when slicing sampling is performed on each cylindrical sample multiple times, the slicing thickness is not more than 1 mm.

[0041] S105, for any target epoxy resin test piece, the target slice corresponding to the target epoxy resin test piece is subjected to photoelastic experiment respectively, the experimental data obtained by photoelastic experiment is obtained, and the experimental data is compared with the calibration fringe data, and the comparison result of the target epoxy resin test piece is obtained.

[0042] The optical test method is a test method for studying and solving the mechanical signals such as stress, strain, displacement and vibration of the structure inside or surface by using optical means. In optical testing, photoelastic method is a non-contact measurement method for testing the measured object by using the birefringence effect of the material, which has the advantage of full-field measurement that cannot be achieved by contact method, and can measure not only surface stress but also internal stress. The characteristic of epoxy resin is that the load it can bear can be saved in the test object in the form of stress fringe, which is not affected even if the load is removed or machined. The application of epoxy resin in photoelastic method not only makes it easy to find the stress concentration position, but also can determine the stress concentration coefficient.

[0043] In the present application, the target slice corresponding to the target epoxy resin test piece is subjected to mechanical grinding and polishing treatment, so that the surface is smooth and flat, and the uneven parts and impurities that may interfere with the experimental results are removed. In the optical polarization microscope, the target slice is subjected to photoelastic experiment respectively, the preferential direction and the change of optical path difference of the target slice under various pressures or stresses are observed and recorded, and the comparison between the processed experimental data and the calibration fringe data is carried out, and the comparison results of the mechanical properties and physical properties of the target epoxy resin test piece such as strength, elastic modulus, fracture toughness, thermal expansion coefficient and stress distribution are analyzed.

[0044] S106, the comparison results respectively corresponding to all target epoxy resin test pieces are analyzed, and the strength analysis result of the disc is obtained.

[0045] The comparison results of all target epoxy resin test pieces are analyzed, the differences and similarities between different test pieces are compared, and the corresponding conclusions are drawn, and based on the analysis result, the strength performance of the disc is evaluated.

[0046] The embodiments of the present application at least have the following beneficial effects: (1) The wheel disc strength analysis method provided by the present application overcomes the defects of the existing contact type wheel disc strength analysis method, such as large difficulty in measuring three-dimensional strain field, many electromagnetic interference signals, and dynamic characteristics of the measured object, and obtains accurate stress analysis results by taking the actual operating load of the wheel disc as a boundary condition to test the wheel disc model. (2) The wheel disc strength analysis method provided by the present application can effectively reduce the construction cost or modification cost of the test bench, and can reduce the test cost by modeling the wheel disc with a large size through the epoxy resin test piece. (3) The wheel disc strength analysis method provided by the present application can obtain the wheel disc internal stress distribution test results which are difficult to obtain by the traditional analysis method, reduce the measurement error, and obtain more reliable strength analysis results.

[0047] Figure 4 is a schematic diagram of an exemplary embodiment of a wheel disc strength analysis method shown in the present application, as shown in Figure 4 The wheel disc strength analysis method comprises the following steps:

[0048] S401, the size of the wheel disc is proportionally reduced to obtain the size characteristics of the to-be-tested wheel disc modeling piece, wherein the wheel disc is a rotational symmetry structure and contains a plurality of blade root grooves.

[0049] S402, according to the size characteristics, a plurality of to-be-tested wheel disc modeling pieces are printed based on a 3D printing method.

[0050] S403, using silica gel as a mold, taking the to-be-tested wheel disc modeling piece as a core mold, pouring silica gel to wrap the entire to-be-tested wheel disc modeling piece, and after the silica gel is solidified, injecting epoxy resin into the negative mold space to obtain an initial epoxy resin test piece.

[0051] S404, the initial epoxy resin test piece is subjected to stress calibration by using a single-arm beam, and the stress fringe value and the strain fringe value of the initial epoxy resin test piece are determined, and the stress fringe value and the strain fringe value are taken as calibration fringe data.

[0052] In order to maximize the test error caused by material changes, in the present application, the calibration sample is made of the same batch of epoxy resin as the initial epoxy resin test piece of the to-be-tested wheel disc, the calibration sample is subjected to stress calibration by using a single-arm beam, the stress fringe value and the strain fringe value corresponding to the initial epoxy resin test piece are determined, and the stress fringe value and the strain fringe value are taken as calibration fringe data.

[0053] S405, a plurality of different single working conditions are designed based on different temperature loads, wheel disc rotating speeds and pre-tightening force torques, and a plurality of initial epoxy resin test pieces are subjected to load experiments based on different single working conditions respectively, a plurality of target epoxy resin test pieces obtained after the load experiments are obtained, and the initial epoxy resin test pieces correspond to the single working conditions one by one.

[0054] The initial epoxy resin test piece made of epoxy resin is subjected to a modeling test. When designing the modeling test, many factors such as model size, load ratio, test bench condition and the like in the test need to be considered. Different temperature loads, disc speeds and pre-tightening torques correspond to different working conditions in the actual operation process, so as to simulate the stress conditions of the disc under different working conditions.

[0055] According to the modeling test scheme, the initial epoxy resin test piece is subjected to a load test, and the epoxy resin test piece obtained after the load test is taken as the target epoxy resin test piece to be analyzed. Each initial epoxy resin test piece can only be subjected to a single working condition test to ensure that the influence between stress stripes is small and the error generated in the test result analysis process is reduced.

[0056] S406, the total number of blade root grooves of the disc is obtained, and the number of sectors for sector division is determined according to the total number of blade root grooves. Then, the target epoxy resin test piece is uniformly divided into sectors according to the number of sectors. Each sector after division contains a complete blade root groove, and one of the sectors is selected as a target sector.

[0057] The total number of blade root grooves of the disc is obtained, and the number of sectors for sector division is determined according to the total number of blade root grooves. For example, if the disc contains 20 blade root grooves, in order to make the blade root grooves on each sector after division be in a complete state, the target epoxy resin test piece can be uniformly divided into 10 sectors, each sector containing 2 complete blade root grooves. One of the 10 sectors is selected as a target sector.

[0058] S407, multiple regions at different distances from the center of the target sector are selected, and the multiple regions are subjected to punching sampling to obtain multiple cylindrical samples obtained by punching sampling.

[0059] The target sector after block cutting is still large and not easy to observe by slicing. It needs to be punched and sampled. In order to obtain the analysis results of different regions in the target sector, in this application, multiple regions at different distances from the center of the target sector are selected. For example, punching sampling is performed at a distance of 0.2 cm, 0.5 cm and 1 cm from the center of the sector, respectively, to obtain multiple cylindrical samples obtained by punching sampling.

[0060] When the multiple regions of the target sector are subjected to punching sampling, the punching diameter is not more than 1 millimeter.

[0061] S408, multiple slice samples are taken for each cylindrical sample to obtain multiple target slices corresponding to the target epoxy resin test piece.

[0062] The target epoxy resin test piece is subjected to multiple slice sampling, and multiple target slices corresponding to the target epoxy resin test piece are obtained.

[0063] The thickness of each slice is not more than 1mm.

[0064] S409, for any target epoxy resin test piece, the target slices are respectively placed in the laser polarized light field for photoelastic experiment, and the light path image in the laser polarized light field is recorded.

[0065] Figure 5 is a laser polarized light field diagram shown in the present application, as Figure 5 shown, the laser polarized light field includes a light source, a polarizer, a first quarter wave plate, a second quarter wave plate, an analyzer and a high-speed camera. When performing photoelastic experiment, the target slice 4 is put in, the light starts from the light source 1, becomes polarized light through the polarizer 2, passes through the target slice 4 after the polarized light transmits through the first quarter wave plate 3, then passes through the second quarter wave plate 5 and enters the analyzer 6, and finally reaches the high-speed camera 7, which records the light path.

[0066] S410, the light path image is processed and analyzed to obtain the full-field shear stress distribution and the principal stress trajectory of the light path image.

[0067] The color light path image is converted into a gray scale image, and the shear stress difference method is used to analyze the gray scale image to obtain the full-field shear stress distribution and the principal stress trajectory of the gray scale image.

[0068] S411, the full-field shear stress distribution and the principal stress trajectory are taken as experimental data, and the experimental data are compared with the calibration stripe data to obtain the comparison result of the target epoxy resin test piece.

[0069] S412, the comparison results corresponding to all target epoxy resin test pieces are respectively arranged and analyzed to obtain the strength analysis result of the disc.

[0070] The embodiments of the present application at least have the following beneficial effects: (1) The wheel disc strength analysis method provided by the present application overcomes the defects of the existing contact type wheel disc strength analysis method, such as large difficulty in measuring three-dimensional strain field, many electromagnetic interference signals, and dynamic characteristic emission of the measured object. The actual running load of the wheel disc is taken as a boundary condition to test the wheel disc model, so that accurate stress analysis results are obtained. (2) The wheel disc strength analysis method provided by the present application can effectively reduce the construction cost or modification cost of the test bench. The wheel disc with a large size is modeled by manufacturing an epoxy resin test piece, so that the test cost is reduced. (3) The wheel disc strength analysis method provided by the present application can obtain the wheel disc internal stress distribution test results which are difficult to obtain by the traditional analysis method, reduces the measurement error, and can obtain more reliable strength analysis results.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0072] In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0073] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0074] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary, and are not to be interpreted as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for analyzing the strength of a roulette wheel, characterized in that, include: Multiple initial epoxy resin test specimens corresponding to the wheel are obtained, and calibration stripe data corresponding to the initial epoxy resin test specimens are obtained. The wheel is a rotationally symmetric structure and contains multiple blade root grooves. Load tests were performed on the multiple initial epoxy resin test specimens under different single working conditions to obtain multiple target epoxy resin test specimens after the load tests. Each initial epoxy resin test specimen corresponds one-to-one with the single working condition. The target epoxy resin test piece is evenly divided into sectors according to the total number of leaf root grooves, and one sector is selected as the target sector. The target sector contains at least one leaf root groove, and all leaf root grooves in the target sector are in an intact state. Multiple areas of the target sector are sampled by drilling to obtain multiple cylindrical samples obtained by drilling and sampling. Each cylindrical sample is then sliced ​​multiple times to obtain multiple target slices corresponding to the target epoxy resin test piece. For any of the target epoxy resin test specimens, photoelasticity tests are performed on the target slices corresponding to the target epoxy resin test specimens to obtain the experimental data obtained from the photoelasticity tests. The experimental data are then compared with the calibration stripe data to obtain the comparison results of the target epoxy resin test specimens. The comparative results corresponding to all the target epoxy resin test specimens were sorted and analyzed to obtain the strength analysis results of the wheel.

2. The method according to claim 1, characterized in that, The step of uniformly dividing the target epoxy resin test specimen into sectors based on the total number of leaf root grooves includes: Obtain the total number of blade root grooves of the wheel; The number of sectors to be divided is determined based on the total number of leaf root grooves; The target epoxy resin test specimen is uniformly divided into sectors according to the number of sectors, wherein the leaf root groove contained in each sector is in an intact state.

3. The method according to claim 2, characterized in that, When sampling multiple areas of the target sector, the diameter of the holes shall not exceed 1 mm.

4. The method according to claim 2, characterized in that, When performing multiple slice samplings on each of the cylindrical samples, the slice thickness shall not exceed 1 mm.

5. The method according to any one of claims 1-4, characterized in that, The process involves performing load tests on the multiple initial epoxy resin test specimens under different single working conditions to obtain multiple target epoxy resin test specimens after the load tests, including: Design multiple different single working conditions based on different temperature loads, wheel speeds, and preload torques; Load tests were conducted on the multiple initial epoxy resin test specimens under different single working conditions to obtain multiple target epoxy resin test specimens after the load tests.

6. The method according to claim 5, characterized in that, The step of drilling and sampling multiple areas of the target sector to obtain multiple cylindrical samples from the drilling samples includes: Select multiple regions at different distances from the center of the target sector; Multiple cylindrical samples were obtained by drilling and sampling at the aforementioned regions.

7. The method according to claim 6, characterized in that, The photoelasticity test is performed on the target slices corresponding to the target epoxy resin test specimen, and the experimental data obtained from the photoelasticity test is included: Each target slice was placed in a laser polarization field to conduct a photoelastic experiment, and the optical path image in the laser polarization field was recorded. The optical path image is processed and analyzed to obtain the full-field shear stress distribution and principal stress traces of the optical path image; The full-field shear stress distribution and principal stress trajectories are used as the experimental data.

8. The method according to claim 7, characterized in that, The acquisition of multiple initial epoxy resin test specimens corresponding to the wheel includes: The dimensions of the wheel are scaled down proportionally to obtain the dimensional characteristics of the molded wheel under test. Based on the aforementioned size characteristics, multiple molded parts of the wheel to be tested are printed using 3D printing. Silicone is used as a mold, and the molded part of the wheel to be tested is used as a core mold. Silicone is poured in to encapsulate the entire molded part of the wheel to be tested. After the silicone is cured, epoxy resin is injected into the cavity of the mold to obtain the initial epoxy resin test piece.

9. The method according to claim 8, characterized in that, The step of obtaining the calibration stripe data corresponding to the initial epoxy resin test specimen includes: The initial epoxy resin test specimen was stress-calibrated using a single-arm beam to determine the stress fringe value and strain fringe value of the initial epoxy resin test specimen. The stress fringe values ​​and strain fringe values ​​are used as the calibration fringe data.

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