GFRP core rod aging evaluation method and device

Abstract

The invention provides a GFRP core rod aging evaluation method and device, and belongs to the field of aging evaluation. The method comprises the following steps: acquiring the DMT modulus of the end surface of a sample to be detected and the DMT modulus of the end surface of a contrast sample; the batch of the contrast GFRP core rod is the same as that of the GFRP core rod to be detected; according to the DMT modulus of the to-be-detected sample, determining the characteristic thickness of the to-be-detected sample, and recording the characteristic thickness as a first thickness; determining the characteristic thickness of the control sample according to the DMT modulus of the control sample, and recording the characteristic thickness as a second thickness; calculating the ratio of the first thickness to the second thickness, and determining the aging degree of the to-be-detected sample according to the ratio. According to the method, the interface characteristic thickness of the two materials in the sample is determined based on the DMT modulus distribution, aging evaluation is performed on the sample by taking the unused sample as a contrast, the calculation process is simple, and evaluation is accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of aging assessment, and in particular to a GFRP core rod aging assessment method and device. Background Art

[0002] Glass fiber reinforced epoxy resin (GFRP) material is an advanced composite material with medium elastic modulus and high tolerance to harsh environmental conditions. GFRP core rod is a new type of high-performance engineering composite material made of glass fiber reinforced epoxy resin material. It is widely used in synthetic insulator core rods and lightning arresters, reactors, and fusion networks in power supply systems.

[0003] During long-term operation, the silicone rubber sheath of the GFRP core rod may age and break, reducing the moisture-proof effect on the core rod. The gaseous and liquid moisture in the natural environment will gradually diffuse and invade the GFRP material, causing microscopic damage to the fiber-matrix interface. The accumulation of damage causes the degradation of the mechanical properties of the material, resulting in the attenuation of the overall deformation resistance and bearing capacity of the material at a macroscopic scale, until the insulator breaks. The performance of the GFRP core rod is related to the safe and stable operation of the transmission line. Therefore, it is necessary to evaluate the aging of the GFRP core rod to ensure the safe and stable operation of the transmission line.

[0004] In the existing technology, infrared thermal imaging can be used to determine the degree of core rod aging, but the calculation and analysis process is complicated and the accuracy is not high. Terahertz spectroscopy technology can also be used to determine the degree of core rod aging, but a large number of samples are required for model training, the data is complex, and it is not suitable for promotion. Summary of the invention

[0005] The embodiment of the present invention provides a GFRP core rod aging evaluation method and device to solve the problem that the core rod aging detection technology in the prior art has a complex analysis process and is difficult to promote.

[0006] In a first aspect, an embodiment of the present invention provides a GFRP core rod aging evaluation method, comprising:

[0007] Obtaining the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod has not been put into use, and the control GFRP core rod and the GFRP core rod to be tested are from the same batch;

[0008] Determine the characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, recorded as the first thickness; determine the characteristic thickness of the control sample according to the DMT modulus of the control sample, recorded as the second thickness;

[0009] The ratio of the first thickness to the second thickness is calculated, and the aging degree of the sample to be tested is determined according to the ratio.

[0010] In a second aspect, an embodiment of the present invention provides a GFRP core rod aging evaluation device, comprising:

[0011] The parameter acquisition module is used to obtain the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod has not been put into use, and the control GFRP core rod and the GFRP core rod to be tested are of the same batch;

[0012] A thickness calculation module is used to determine the characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, recorded as the first thickness; and determine the characteristic thickness of the control sample according to the DMT modulus of the control sample, recorded as the second thickness;

[0013] The aging evaluation module is used to calculate the ratio of the first thickness to the second thickness, and determine the aging degree of the sample to be tested according to the ratio.

[0014] The embodiment of the present invention provides a GFRP core rod aging evaluation method and device; the method includes: obtaining the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod has not been put into use, and the control GFRP core rod is the same batch as the GFRP core rod to be tested; according to the DMT modulus of the sample to be tested, the characteristic thickness of the sample to be tested is determined, recorded as the first thickness; according to the DMT modulus of the control sample, the characteristic thickness of the control sample is determined, recorded as the second thickness; the ratio of the first thickness to the second thickness is calculated, and the aging degree of the sample to be tested is determined according to the ratio. As the GFRP core rod ages, the fiber-matrix interface is microscopically damaged, and the interface width changes. Based on this, in the embodiment of the present invention, the interface characteristic thickness of the two materials in the sample is determined based on the DMT modulus distribution, and the interface characteristic thickness of the unused sample is used as a control to evaluate the aging of the GFRP core rod, which is simple to operate, has a small amount of data, a simple calculation process, accurate evaluation, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1It is a flow chart of an implementation of a GFRP core rod aging evaluation method provided by an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the DMT modulus distribution at the interface of the GFRP core material glass fiber epoxy resin;

[0018] Figure 3 is a 3D map of the DMT modulus of the AFM scanning area provided by an embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of modulus curves and an average modulus curve corresponding to each straight line path of a sample to be tested provided by an embodiment of the present invention;

[0020] Figure 5 It is a schematic diagram of a GFRP core rod aging evaluation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0023] As the GFRP core rod ages, damage occurs to the fiber-matrix interface. Therefore, the interface performance between the glass fiber and the epoxy resin matrix inside the GFRP core rod can directly reflect the aging degree of the core rod. The evaluation of the aging degree of the GFRP core rod can be directly transformed into the performance evaluation of the interface between the glass fiber and the epoxy resin matrix.

[0024] The DMT modulus is an important indicator of the mechanical properties of materials and is often used to measure the viscoelasticity and damping properties of materials. Based on this, the embodiments of the present invention can evaluate the performance of the interface between the glass fiber and the epoxy resin matrix through the DMT modulus, thereby evaluating the aging degree of the GFRP core rod.

[0025] Based on the above analysis, reference Figure 1 ,, Figure 1 The following is a schematic diagram of the implementation process of a GFRP core rod aging evaluation method.

[0026] The above-mentioned GFRP core rod aging evaluation method includes:

[0027] S101: obtaining the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod is not put into use, and the control GFRP core rod is from the same batch as the GFRP core rod to be tested;

[0028] The embodiment of the present invention first obtains the DMT modulus of the end surface of the sample to be tested and the DMT modulus of the end surface of the reference sample for subsequent data analysis.

[0029] In a possible implementation, the QNM mode of an atomic force microscope may be used to scan the end surface of the sample to be tested and the end surface of the reference sample to obtain the DMT modulus of the end surface of the sample to be tested and the DMT modulus of the end surface of the reference sample.

[0030] The QNM mode of the atomic force microscope can directly scan and obtain the DMT modulus of the sample;

[0031] Specifically, the specific means of obtaining the test samples and the control samples are as follows:

[0032] 1. Select the GFRP core rod to be tested and the unused control GFRP core rod from the same batch;

[0033] 2. Use a cold saw to cut the short sample of the test sample and the short sample of the control sample from the high-voltage end fitting to the front area of ​​the first shed skirt of the GFRP core rod to be tested and the control GFRP core rod respectively;

[0034] Since aging occurs in the area between the high-voltage end fitting and the front of the first shed skirt, short samples can be taken from this area for aging evaluation.

[0035] 3. Remove the silicone rubber sheaths of the short samples of the tested sample and the short samples of the control sample, leaving only the core rod part;

[0036] The DMT modulus of the silicone rubber sheath is useless data and may affect subsequent data analysis, so the silicone rubber sheath needs to be removed.

[0037] 4. Use a double-sided grinding and polishing machine to double-sided grind the short samples of the test sample and the short samples of the control sample;

[0038] Since the atomic force microscope scanning to obtain the DMT modulus has requirements on the surface roughness of the sample, the end faces of the short sample need to be ground until the roughness of the two end faces Ra> 1. At the same time, since the two end faces of the short sample need to be parallel, the short sample can be directly double-sided ground to ensure the consistency of the two end faces.

[0039] 5. Use an atomic force microscope to scan the ground short sample of the sample to be tested and the short sample of the reference sample to obtain the DMT modulus of the end surface of the sample to be tested and the DMT modulus of the end surface of the reference sample.

[0040] refer to Figure 2 and Figure 3 , the scanning area can be selected as the area within 1 mm from the edge of the short sample, and the scanning range is set to 60×60μm.

[0041] S102: determining a characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, recorded as a first thickness; determining a characteristic thickness of the control sample according to the DMT modulus of the control sample, recorded as a second thickness;

[0042] S103: Calculate the ratio of the first thickness to the second thickness, and determine the aging degree of the sample to be tested according to the ratio.

[0043] As aging progresses, the characteristic modulus of the interface between the glass fiber and the epoxy resin matrix will change greatly. Define the characteristic thickness, the more severe the aging, the thicker the characteristic thickness.

[0044] Based on the above, in the embodiment of the present invention, the characteristic interface thickness of the two materials in the sample is determined based on the DMT modulus distribution, and the characteristic interface thickness of the unused sample is used as a control to evaluate the aging of the GFRP core rod. The operation is simple, the amount of data is small, the calculation process is simple, the evaluation is accurate, and it is easy to promote.

[0045] In a possible implementation, S102 may include:

[0046] S1021: forming a DMT modulus 3D graph of the DMT modulus of the sample to be tested;

[0047] S1022: forming a plurality of straight paths of preset lengths on the DMT modulus 3D map; wherein each straight path crosses the epoxy resin region and the glass fiber region;

[0048] S1023: for any straight path, extract the DMT modulus on the straight path to form a modulus curve corresponding to the straight path; wherein the abscissa of the modulus curve is the path length, and the ordinate is the modulus value;

[0049] S1024: Determine a first thickness according to each modulus curve.

[0050] In the embodiment of the present invention, the DMT modulus of the sample to be tested is directly output by the software to form a DMT modulus 3D graph, referring to Figure 3 , forming multiple straight line paths of preset lengths on the DMT modulus 3D graph, and also drawing multiple straight lines of fixed lengths, and then extracting the DMT modulus falling on the straight lines to form a modulus curve. Figure 4, select 6 straight line paths to form 6 modulus curves. Among them, multiple straight line paths of preset lengths can be randomly generated or manually input by the user.

[0051] It should be noted that the path length of each straight line path at one end of the glass fiber side is defined as 0, and the path length at one end of the epoxy resin matrix side is defined as a preset length, forming a modulus curve, referring to Figure 4 .

[0052] refer to Figure 4 ,With aging, there is a difference in the width of the transition part between the glass fiber and the epoxy resin matrix, and the width of the transition part can be defined as the characteristic thickness.

[0053] In a possible implementation, S1024 may include:

[0054] 1. Calculate the mean of each modulus curve to obtain the average modulus curve;

[0055] 2. Find the maximum modulus value and the minimum modulus value in the average modulus curve;

[0056] 3. Determine a first modulus threshold value according to the maximum modulus value; determine a second modulus threshold value according to the minimum modulus value;

[0057] 4. Determine the path length corresponding to the first modulus threshold in the average modulus curve, recorded as the first length value; determine the path length corresponding to the second modulus threshold in the average modulus curve, recorded as the second length value;

[0058] 5. Calculate the difference between the first length value and the second length value, and use the absolute value of the difference as the first thickness.

[0059] based on Figure 4 In the embodiment of the present invention, the average value of each modulus curve is calculated to obtain an average modulus curve, and the width of the middle interface portion of the average modulus curve is used as the characteristic thickness. The average modulus curve integrates the average value of each modulus curve, thereby improving the accuracy of the calculation.

[0060] In a possible implementation, determining the first modulus threshold according to the maximum modulus value; and determining the second modulus threshold according to the minimum modulus value may include:

[0061] (1) multiplying the maximum modulus value by a first coefficient to obtain a first modulus threshold;

[0062] (2) multiplying the minimum modulus value by a second coefficient to obtain a second modulus threshold;

[0063] Among them, the first coefficient is less than 1, and the second coefficient is greater than 1.

[0064] In a possible implementation, the first coefficient may be 90%, and the second coefficient may be 110%.

[0065] At the same time, the embodiment of the present invention determines the first modulus threshold and the second modulus threshold as inflection points, and calculates the first thickness, and the calculation process is simple and accurate.

[0066] Corresponding to the above embodiment, the same method is used to determine the second thickness, ensuring that the calculation of the first thickness and the second thickness remains consistent, thereby avoiding deviations caused by inconsistent calculation methods.

[0067] In a possible implementation manner, the preset length may be 10 μm.

[0068] In a possible implementation manner, the number of straight line paths may be at least 5.

[0069] Exemplarily, the number of straight line paths may be 10, which ensures the accuracy of calculation and does not cause a large amount of data.

[0070] There is no specific limit on the number of straight line paths, which can be set according to actual application requirements.

[0071] Corresponding to the above embodiment, multiple short samples can also be cut from a GFRP core rod to be tested, and the characteristic thickness of each short sample can be calculated using the method in the above embodiment, and the average of the characteristic thickness of each short sample can be used as the first thickness; similarly, multiple short samples can be cut from a control GFRP core rod, and the average of the characteristic thickness of each short sample can be calculated as the second thickness, and the errors can be averaged, which effectively improves the accuracy of the calculation of the first thickness and the second thickness, thereby improving the accuracy of the aging evaluation.

[0072] Furthermore, if multiple samples to be tested are from the same batch, each sample to be tested can share a control sample. When evaluating each sample to be tested, the second thickness only needs to be calculated once, thereby reducing the amount of calculation.

[0073] In a possible implementation, S103 may include:

[0074] S1031: Obtain a preset grade evaluation table; the grade evaluation table includes a plurality of preset value areas and corresponding grades;

[0075] S1032: Determine the numerical range where the ratio is located in the grade evaluation table, and use the grade corresponding to the numerical range as the aging grade of the sample to be tested;

[0076] Among them, the larger the ratio, the more serious the aging.

[0077] Exemplarily, three samples to be tested and one control sample from the same batch are selected, and the calculated first thicknesses are 1.2 μm, 1.8 μm, and 2.7 μm, respectively. The second thickness of the control sample is 0.9 μm. The corresponding ratios of the three samples to be tested are k1=1.33, k2=2, and k3=3, respectively. According to the grade evaluation table, the aging grades can be determined to be A, C, and D, respectively; among them, grade D aging is the most serious, and grade A aging is not serious.

[0078] The GFRP core rod aging evaluation provided by the above embodiment can achieve effective and accurate evaluation of the aging degree of the GFRP core rod, and provide effective and accurate data support for the safe and stable operation of the transmission line.

[0079] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0080] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0081] Figure 5 The structural schematic diagram of the GFRP mandrel aging evaluation device provided by the embodiment of the present invention is shown. For the convenience of explanation, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0082] like Figure 5 As shown, the GFRP core rod aging evaluation device includes:

[0083] The parameter acquisition module 21 is used to obtain the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod has not been put into use, and the control GFRP core rod and the GFRP core rod to be tested are of the same batch;

[0084] The thickness calculation module 22 is used to determine the characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, which is recorded as the first thickness; and to determine the characteristic thickness of the control sample according to the DMT modulus of the control sample, which is recorded as the second thickness;

[0085] The aging evaluation module 23 is used to calculate the ratio of the first thickness to the second thickness, and determine the aging degree of the sample to be tested according to the ratio.

[0086] In a possible implementation, the thickness calculation module 22 may include:

[0087] A modulus map forming unit, used for forming a DMT modulus 3D map from the DMT modulus of the sample to be tested;

[0088] A path forming unit, used for forming a plurality of straight paths of preset lengths on the DMT modulus 3D map; wherein each straight path crosses the epoxy resin area and the glass fiber area;

[0089] A modulus extraction unit is used to extract the DMT modulus on any straight path to form a modulus curve corresponding to the straight path; wherein the abscissa of the modulus curve is the path length and the ordinate is the modulus value;

[0090] The thickness output unit is used to determine the first thickness according to each modulus curve.

[0091] In a possible implementation, the thickness output unit may include:

[0092] The average modulus curve output subunit is used to calculate the average of each modulus curve to obtain the average modulus curve;

[0093] An extreme value determination subunit is used to find the maximum modulus value and the minimum modulus value in the average modulus curve;

[0094] A threshold determination subunit, used to determine a first modulus threshold according to a maximum modulus value; and to determine a second modulus threshold according to a minimum modulus value;

[0095] The boundary determination subunit is used to determine the path length corresponding to the first modulus threshold in the average modulus curve, recorded as the first length value; determine the path length corresponding to the second modulus threshold in the average modulus curve, recorded as the second length value;

[0096] The difference calculation subunit is used to calculate the difference between the first length value and the second length value, and use the absolute value of the difference as the first thickness.

[0097] In a possible implementation manner, the threshold determination subunit includes a subunit that can be specifically used for:

[0098] 1. Multiply the maximum modulus value by the first coefficient to obtain a first modulus threshold;

[0099] 2. Multiply the minimum modulus value by the second coefficient to obtain a second modulus threshold;

[0100] Among them, the first coefficient is less than 1, and the second coefficient is greater than 1.

[0101] In a possible implementation, the first coefficient may be 90%, and the second coefficient may be 110%.

[0102] In a possible implementation manner, the preset length may be 10 μm.

[0103] In a possible implementation manner, the number of straight line paths may be at least 5.

[0104] In a possible implementation, the aging evaluation module 23 may include:

[0105] A grade table acquisition unit is used to acquire a preset grade evaluation table; the grade evaluation table includes a plurality of preset value areas and corresponding grades;

[0106] A grade output unit, used to determine the numerical range where the ratio is located in the grade evaluation table, and use the grade corresponding to the numerical range as the aging grade of the sample to be tested;

[0107] Among them, the larger the ratio, the more serious the aging.

[0108] In a possible implementation manner, the QNM mode of an atomic force microscope is used to scan the end surface of the sample to be tested and the end surface of the reference sample to obtain the DMT modulus of the end surface of the sample to be tested and the DMT modulus of the end surface of the reference sample.

[0109] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0110] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0111] If the module / unit 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 this 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. When the computer program is executed by the processor, it can implement the steps of the above-mentioned GFRP core rod aging evaluation method embodiments. Among them, 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. Computer-readable media can include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A GFRP core rod aging evaluation method, characterized in that: include: Obtaining the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod has not been put into use, and the control GFRP core rod is from the same batch as the GFRP core rod to be tested; Determine the characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, recorded as the first thickness; determine the characteristic thickness of the control sample according to the DMT modulus of the control sample, recorded as the second thickness; The ratio of the first thickness to the second thickness is calculated, and the aging degree of the sample to be tested is determined according to the ratio.

2. The GFRP core rod aging evaluation method according to claim 1, characterized in that: The step of determining a characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, recorded as a first thickness, includes: The DMT modulus of the sample to be tested is formed into a DMT modulus 3D graph; Forming a plurality of straight paths of preset lengths on the DMT modulus 3D map; wherein each straight path crosses the epoxy resin region and the glass fiber region; For any straight path, extract the DMT modulus on the straight path to form a modulus curve corresponding to the straight path; wherein the abscissa of the modulus curve is the path length, and the ordinate is the modulus value; The first thickness is determined according to each modulus curve.

3. The GFRP core rod aging evaluation method according to claim 2, characterized in that: The determining the first thickness according to each modulus curve comprises: Calculate the mean of each modulus curve to obtain the average modulus curve; Finding the maximum modulus value and the minimum modulus value in the average modulus curve; Determine a first modulus threshold value according to the maximum modulus value; determine a second modulus threshold value according to the minimum modulus value; Determine a path length corresponding to the first modulus threshold in the average modulus curve, recorded as a first length value; determine a path length corresponding to the second modulus threshold in the average modulus curve, recorded as a second length value; The difference between the first length value and the second length value is calculated, and the absolute value of the difference is used as the first thickness.

4. The GFRP core rod aging evaluation method according to claim 3, characterized in that: Determining a first modulus threshold according to the maximum modulus value; Determining a second modulus threshold according to the minimum modulus value includes: Multiplying the maximum modulus value by a first coefficient to obtain the first modulus threshold; Multiplying the minimum modulus value by a second coefficient to obtain the second modulus threshold; The first coefficient is less than 1, and the second coefficient is greater than 1.

5. The GFRP core rod aging evaluation method according to claim 4, characterized in that: The first coefficient is 90%, and the second coefficient is 110%.

6. The GFRP core rod aging evaluation method according to claim 2, characterized in that: The preset length is 10 μm.

7. The GFRP core rod aging evaluation method according to claim 2, characterized in that: The number of the straight line paths is at least 5.

8. The GFRP core rod aging evaluation method according to any one of claims 1 to 7, characterized in that: Determining the aging degree of the sample to be tested according to the ratio includes: Obtaining a preset grade evaluation table; the grade evaluation table includes a plurality of preset value areas and corresponding grades; Determine the numerical range in which the ratio is located in the grade evaluation table, and use the grade corresponding to the numerical range as the aging grade of the sample to be tested; The larger the ratio is, the more serious the aging is.

9. The GFRP core rod aging evaluation method according to any one of claims 1 to 7, characterized in that: The end surface of the sample to be tested and the end surface of the reference sample are scanned using a QNM mode of an atomic force microscope to obtain the DMT modulus of the end surface of the sample to be tested and the DMT modulus of the end surface of the reference sample.

10. A GFRP core rod aging evaluation device, characterized in that: include: A parameter acquisition module, used to acquire the DMT modulus of the end face of the sample to be tested and the DMT modulus of the end face of the control sample; wherein the sample to be tested is a short sample cut from the GFRP core rod to be tested, and the control sample is a short sample cut from the control GFRP core rod; the control GFRP core rod has not been put into use, and the control GFRP core rod is from the same batch as the GFRP core rod to be tested; A thickness calculation module, used to determine the characteristic thickness of the sample to be tested according to the DMT modulus of the sample to be tested, recorded as a first thickness; and determine the characteristic thickness of the control sample according to the DMT modulus of the control sample, recorded as a second thickness; The aging evaluation module is used to calculate the ratio of the first thickness to the second thickness, and determine the aging degree of the sample to be tested according to the ratio.

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