Multi-factor evaluation method for influence of environmental temperature and humidity on dynamic conductance characteristics of carbon fiber composite material

Abstract

The present application provides a multi-factor evaluation method for environmental temperature and humidity on dynamic conductance characteristics of carbon fiber composite material, studies various influencing factors of dynamic conductance characteristics of carbon fiber composite material under the action of non-destructive lightning current component, obtains the influence law of environmental factors such as temperature and humidity on dynamic conductance characteristics of carbon fiber composite material, on this basis, establishes an environmental multi-factor evaluation model for dynamic conductance characteristics of carbon fiber composite material, obtains a mathematical expression of the correlation between dynamic conductance characteristics of carbon fiber composite material and environmental factors such as temperature and humidity and corresponding influence factors, and provides a basis for the research on lightning damage characteristics and lightning protection technology of carbon fiber composite material laminated plate.

Description

Technical Field

[0001] This invention belongs to the field of electrical technology and relates to a method for evaluating the electrical properties of carbon fiber composite materials, particularly a multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials. Background Technology

[0002] Carbon fiber composites, possessing excellent properties such as low density, high strength, high modulus, high temperature resistance, and chemical corrosion resistance, while also exhibiting the flexibility and processability of textile fibers, are increasingly widely used in aerospace, weaponry, and other fields. They serve not only as load-bearing structures but also possess electrical functional properties such as antistatic properties and electromagnetic shielding. During aircraft service, they face various natural environments including high and low temperatures, ultraviolet radiation, and humidity. The electrical conductivity of composite materials is significantly affected by environmental factors such as temperature, humidity, salt spray, and mechanical stress. Ultraviolet radiation may affect the surface conductivity of carbon fiber composites, high-temperature oxidation may alter the conductive pathways, and humid environments can cause the resin matrix to expand, thus deteriorating the conductive network.

[0003] Harsh environmental factors pose significant challenges to the accurate measurement and evaluation of the electrical properties of carbon fiber composites. On the one hand, the anisotropy and microstructural inhomogeneity of carbon fiber composites themselves lead to considerable dispersion in conductivity measurement data. On the other hand, it is difficult to accurately reproduce and measure the effects of various environmental factors (especially under multi-field coupling conditions) on dynamic conductivity in a laboratory environment. Therefore, studying the influence of ambient temperature and humidity on its dynamic conductivity characteristics and developing accurate measurement methods are crucial for the precise calculation of lightning damage to carbon fiber composites, as well as for the development of lightning damage and lightning protection and evaluation technologies, ensuring the reliability and safety of aircraft operating with novel carbon fiber composite materials.

[0004] Regarding the direct lightning effects on carbon fiber composites, EU and US military standards specify the test requirements and lightning current components for direct lightning effects on aircraft or carbon fiber composites used in aircraft. These components include a 200kA lightning current component A (first lightning return stroke component) or a 150kA lightning current component Ah (transitional component of the first lightning return stroke), a 2kA average current component B (intermediate current component), a 200-800A lightning current C / C* (continuous current component), and a 100kA lightning current component D (subsequent return stroke component). However, there are no standards for the test methods and measurement techniques for the dynamic conductivity / resistance of carbon fiber composites, and the dynamic conductivity / resistance under non-destructive lightning current.

[0005] The dynamic resistance of carbon fiber composites under lightning current influences the shunting characteristics of the lightning current in each layer of the carbon fiber composite, affecting the accuracy of lightning damage model construction and calculation. This leads to significant discrepancies between the lightning damage observed and the theoretical calculations and experimental results in the laboratory. Currently, the quantitative relationship between the dynamic conductivity characteristics of carbon fiber composites and environmental factors over long-term aging has not been obtained, and no publicly available literature reports this. This significantly hinders the accuracy of lightning damage simulation calculations for carbon fiber composites, making it impossible to establish the correlation between lightning damage, lightning protection, and performance improvement of carbon fiber composites, thus restricting their application in aviation, aerospace, and other fields. Summary of the Invention

[0006] To address the lack of data and patterns regarding the influence of environmental temperature and humidity on the conductivity parameters of existing carbon fiber composites, which affects the accuracy of lightning damage simulation analysis and the accuracy of multi-factor assessment of lightning damage, this invention aims to provide a multi-factor assessment method for the influence of environmental temperature and humidity on the dynamic conductivity characteristics of carbon fiber composites, thereby providing support for the improvement of lightning damage and protection technologies for carbon fiber composites.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic electrical conductivity properties of carbon fiber composites includes the following steps: 1) An aging test of carbon fiber composite materials was conducted under constant ambient temperature and different humidity conditions to obtain test data samples on the effect of humidity on the dynamic conductivity of carbon fiber composite materials. 2) Aging tests of carbon fiber composite materials were conducted under constant ambient humidity and different temperature conditions to obtain test data samples on the effect of temperature on the dynamic conductivity of carbon fiber composite materials. 3) Obtain the temperature and humidity thresholds for environmental aging tests of carbon fiber composite materials, establish an evaluation model for the changes / influences of dynamic conductivity characteristics of carbon fiber composite materials, and determine the influence of temperature and humidity on the dynamic conductivity characteristics of carbon fiber composite materials. 4) Based on the obtained influence of temperature and humidity on the dynamic conductivity of carbon fiber composites, a multi-factor regression model combining temperature and humidity is established; using the dynamic conductivity test data of orthogonal carbon fiber composites based on temperature and humidity, the influence of temperature and humidity on environmental aging and the multi-factor regression coefficients are calculated.

[0008] Preferably, in step 1), under a constant ambient temperature, at least five humidity values ​​H1...H5, including the lowest and highest humidity values, are selected within an ambient humidity range of 10%RH to 99%RH for aging tests. The aging time for each humidity value is no less than 5000 hours, and no less than 100 dynamic conductivity test points are conducted within the aging time of each humidity value. The time intervals between the test points are equal or unequal, thereby obtaining test data samples of the influence of humidity at time nodes 1-100 under different humidity values ​​H1...H5 on the dynamic conductivity of carbon fiber composite materials.

[0009] Preferably, in step 2), under a certain ambient humidity, at least five temperature values ​​T1...T5, including the lowest and highest temperature values, are selected within an ambient temperature range of -30℃ to 200℃ for aging tests. The aging time for each temperature value is not less than 5000 hours, and no less than 100 dynamic conductivity test points are conducted within the aging time of each temperature value. The time intervals between the test points are equal or unequal, so as to obtain test data samples on the influence of the temperature at the 1st to 100th time nodes of different temperatures T1...T5 on the dynamic conductivity of carbon fiber composite materials.

[0010] Preferably, step 3) involves obtaining the humidity threshold for accelerated aging of the dynamic conductivity properties of carbon fiber composites and establishing a humidity change / impact assessment model for the dynamic conductivity properties of carbon fiber composites. The specific process includes: If, during step 1), the dynamic conductivity of the carbon fiber composite material changes significantly under the humidity conditions as the ambient temperature increases, then the test is repeated at a new effective humidity test point by subtracting 10%RH from the current humidity. If the dynamic conductivity of the carbon fiber composite material does not change under the new effective humidity conditions, then the test is repeated by adding 5%RH to the effective humidity value. This process continues until the highest humidity threshold for accelerated aging of the carbon fiber composite material is finally determined. Regression analysis was performed on the dynamic conductivity data obtained under effective humidity conditions. If the obtained scatter data showed a roughly linear distribution, a linear regression equation was established; if the scatter data showed an initial increase followed by a relatively stable trend, a quadratic polynomial regression model was established; if the scatter data showed an exponential change, an exponential regression model was established.

[0011] Preferably, step 3) involves obtaining the temperature threshold for accelerated aging of the dynamic conductivity characteristics of carbon fiber composite materials and establishing a temperature change / impact assessment model for the dynamic conductivity characteristics of carbon fiber composite materials. The specific process includes: If, in step 2), the dynamic conductivity of the carbon fiber composite material undergoes significant distortion during the increase in ambient temperature, then 10°C is subtracted from this temperature to obtain a new effective temperature test point for testing; if the dynamic conductivity of the carbon fiber composite material does not change at this new effective temperature, then 5°C is added to this effective temperature point for testing, and so on... until the temperature threshold for accelerated aging of the carbon fiber composite material is finally determined. Regression analysis was performed on the dynamic conductivity data obtained under effective temperature conditions. If the obtained scatter data is roughly linearly distributed, a linear regression equation was established; if the scatter data shows an initial increase followed by a relatively stable trend, a quadratic polynomial regression model was established; if the scatter data shows an exponential change, an exponential regression model was established.

[0012] Preferably, step 1) is repeated 3 times to reduce the dispersion of the sample and obtain the dynamic conductivity data of carbon fiber composite material under constant temperature and 5 humidity conditions. Repeat step 2) three times to reduce the dispersion of the sample and obtain dynamic conductivity data of carbon fiber composite material at constant humidity and five temperatures.

[0013] This invention provides a multi-factor evaluation method for the influence of environmental temperature and humidity on the dynamic conductivity of carbon fiber composite materials. It studies various influencing factors on the dynamic conductivity of carbon fiber composite materials under the action of non-destructive lightning current components, obtaining the influence laws of environmental factors such as temperature and humidity on the dynamic conductivity of carbon fiber composite materials. Based on this, an environmental multi-factor evaluation model for the dynamic conductivity of carbon fiber composite materials is established, obtaining the mathematical expression of the correlation between the dynamic conductivity of carbon fiber composite materials and environmental factors such as temperature and humidity, along with their corresponding influencing factors, as well as the intrinsic correlation between the dynamic conductivity of carbon fiber composite materials and multiple environmental factors. This provides support for improving lightning damage and protection technologies for carbon fiber composite materials and for the safe operation of new carbon fiber composite aircraft. Attached Figure Description

[0014] Figure 1 This is a flowchart of the accelerated aging test method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials according to the present invention. Figure 2(a) is a schematic diagram of the dynamic conductivity measurement device for carbon fiber composite materials of the present invention; Figure 2(b) is a schematic diagram illustrating the measurement principle of the dynamic conductivity characteristics of the carbon fiber composite material of the present invention; Figure 3 This is a flowchart of the method for analyzing the influence of humidity on the dynamic conductivity properties of carbon fiber composite materials according to the present invention; Figure 4 This is a flowchart of the method for analyzing the influence of temperature on the dynamic conductivity properties of carbon fiber composite materials according to the present invention. Detailed Implementation

[0015] The test method and measurement principle of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] This invention obtains the variation law of dynamic electrical conductivity of carbon fiber composite materials by conducting accelerated aging tests on carbon fiber composite materials under ambient temperature and humidity.

[0017] See Figure 1 The present invention provides a multi-factor evaluation method for the influence of environmental temperature and humidity on the dynamic conductivity of carbon fiber composite materials. It includes two parts: an accelerated aging test method for the influence of environmental temperature and humidity on the dynamic conductivity of carbon fiber composite materials and an analysis method for the influence of multiple factors of environmental temperature and humidity on the dynamic conductivity of carbon fiber composite materials.

[0018] The accelerated aging test method for investigating the effects of ambient temperature and humidity on the dynamic electrical conductivity of carbon fiber composites mainly consists of two parts: an orthogonal test of ambient temperature and humidity, as detailed below: 1. Under constant ambient temperature, experimental data were obtained on the influence of ambient humidity on the dynamic electrical conductivity of carbon fiber composite materials.

[0019] 1) Selection of ambient temperature: Conducted at room temperature (25℃) or other fixed temperatures.

[0020] 2) The ambient humidity ranges from 10%RH to 99%RH. At least five humidity values ​​are selected within this range, but at least the lowest and highest humidity points are included.

[0021] 3) The humidity aging time shall not be less than 5000 hours, and no less than 100 dynamic conductivity test points shall be conducted within the aging time. The interval between test points can be equal, and denoted as n=1, 2, ..., 99, 100.

[0022] 4) Set up 100 measurements of the dynamic conductivity characteristics of carbon fiber composite materials, and record the measurement data as σ. IMP25THmn Where: m is the selected humidity condition point (no less than 5), and n is the number of data points detected during the aging test (no less than 100 points).

[0023] 5) Conduct the first aging test under the set humidity H1 condition. When the first time point of the 5000hr aging time is reached, measure the dynamic conductivity σ of the carbon fiber composite material. IMP25TH11 ..., until the 100th time node is reached, the dynamic conductivity σ of the carbon fiber composite material is measured. IMP25TH1100 .

[0024] 6) Repeat step 5) to conduct the first aging test under the first humidity H2 condition. When the second time point is reached within the 5000hr aging time, measure the dynamic conductivity σ of the carbon fiber composite material. IMP25TH21 The experiment was repeated, and when the 10th time point of the 5000hr aging period was reached, the dynamic conductivity σ of the carbon fiber composite material was measured at the 100th time point. IMP25TH2100 .

[0025] 7) Repeat steps 5) and 6) above to conduct experiments on the change of electrical conductivity characteristics of carbon fiber composites under the second humidity conditions from H2 to H5; finally, obtain the dynamic conductivity σ of carbon fiber composites at time nodes 1-100 under humidity conditions H1...H5. IMP25TH11 , ..., σ IMP25HT1100 , ..., until σ IMP25TH51 , ..., σ IMP25TH5100 .

[0026] 2. Under constant ambient humidity, obtain test data on the dynamic electrical conductivity characteristics of carbon fiber composite materials under ambient temperature.

[0027] 1) Selection of ambient humidity: An average ambient humidity of 60%RH can be considered.

[0028] 2) The ambient temperature range covers the harsh environmental temperatures of the aircraft, from -30℃ to 60℃. Considering that in an oxygen-rich environment (such as air), the decomposition temperature is significantly reduced due to the thermal oxidation and decomposition of the resin, typically starting at 180-200℃, the upper limit of the environmentally accelerated aging temperature for carbon fiber composite materials is set at 200℃. At least [amount missing] within the range of -30℃ to 200℃ is selected. m Environmental aging tests of carbon fiber composite materials were conducted at a temperature condition of 5, denoted as . m =1, 2, ..., 5.

[0029] 3) The aging time at ambient temperature shall not be less than 5000 hours, and within the aging time, an aging process of not less than [amount missing] hours shall be carried out. n The test points for dynamic conductance and dynamic conductance characteristics are 100. The time intervals between the test points can be equal, denoted as . n =1, 2, ..., 99, 100.

[0030] 4) During the environmental temperature aging test of carbon fiber composite materials, the measured data is recorded as σ. 60HTmn ,in, m =1, 2, ..., 5, n =1, 2, ..., 99, 100 5) Conduct an aging test on the carbon fiber composite material under the first set temperature T1. When the first time point within the 5000hr aging time is reached, measure the dynamic conductivity σ of the carbon fiber composite material. IMP60HT11 .

[0031] 6) Repeat step 5) to conduct an aging test on the carbon fiber composite material at the first temperature T1. When the second time point is reached within the 5000hr temperature aging time, measure the dynamic conductivity σ of the carbon fiber composite material. IMP60HT12 The experiment was repeated... When the 100th time point of the 5000hr temperature aging period was reached, the dynamic conductivity σ of the carbon fiber composite material at the 100th time point was measured. IMP60HT1100 .

[0032] 7) By repeating the temperature aging tests in processes 5) and 6), the dynamic conductivity σ of the carbon fiber composite material at time points 1-100 under ambient temperature aging conditions T1...T5 can be obtained. IMP60HT11 , ..., σ IMP60HT100 ...until the dynamic conductivity σ of the carbon fiber composite material at constant humidity and the 5th ambient temperature. IMP60HT51 , ..., σ IMP60HT5100 .

[0033] 3. Obtaining experimental data from multifactor regression analysis of environmental temperature and humidity aging 1) Humidity acceleration threshold and the influence of humidity on the dynamic conductivity of carbon fiber composites (1) Generally, for carbon fiber composites with a layup structure, since the temperature resistance of carbon fiber material is much higher than that of interlayer resin material, the temperature change has little effect on the properties of carbon fiber material. Therefore, this application focuses on the effect of temperature change on the dynamic electrical conductivity of carbon fiber composites in the thickness direction. In other words, unless otherwise specified, the dynamic electrical conductivity in this application specifically refers to the dynamic electrical conductivity in the thickness direction of carbon fiber composites.

[0034] (2) Repeat process 1 for 3 ( i =3) tests were conducted to reduce the dispersion of the samples, and the dynamic conductivity data of the carbon fiber composite material was obtained under constant temperature (25℃) and 5 humidity levels (10%-99%RH). Dynamic conductivity σ IMP25TH11i , ..., σ IMP25HT1100i ... until the dynamic conductance σ IMP25TH51i , ..., σ IMP25TH5100i .

[0035] 2) Temperature acceleration factor and data on the electrical conductivity of carbon fiber composites (1) Similarly, this application focuses on the effect of temperature change on the dynamic electrical conductivity of carbon fiber composite material in the thickness direction. In other words, without further explanation, in the temperature accelerated aging test of this application, dynamic electrical conductivity also specifically refers to the dynamic electrical conductivity of carbon fiber composite material in the thickness direction.

[0036] (2) Repeat process 2 for 3 ( i =3) tests were conducted to reduce the dispersion of the samples, and the dynamic conductivity data σ of the carbon fiber composite material was obtained under constant humidity (average humidity 60%) and 5 temperatures (-30℃-200℃). IMP60HT11i , ..., σ IMP60HT100i ...until the dynamic conductivity σ of the carbon fiber composite material at constant humidity and the 5th ambient temperature. IMP60HT51i , ..., σ IMP60HT5100i .

[0037] Referring to Figures 2(a) and 2(b), the dynamic conductivity characteristics of triaxial carbon fiber composite materials were measured according to the invention patent ZL 201510453885.5, "Method and Device for Measuring Impedance Characteristics of Carbon Fiber Composite Materials under Non-destructive Lightning Current". The dynamic conductivity measurement device mainly consists of a controllable DC high-voltage charging circuit 1, a pulse current discharge unit 2, a carbon fiber composite material 3, a control unit 4, a measurement unit 5, and a computer data processing unit 6. Specifically, the controllable DC high-voltage charging circuit 1 comprises a voltage regulator T1, a transformer T2, a rectifier silicon stack D, and a charging resistor. R 1. Components: Switch S and resistor R 2. A safe discharge circuit for the energy storage capacitor is formed; the energy storage capacitor 2 (capacity C), the discharge switch 3, the waveform forming inductor 5 (inductance L), and the waveform forming resistor 4 (resistance R) form a pulse current discharge circuit. The waveform of the pulse current can be the 8 / 20μs standard lightning current waveform in the power field, or the 6.4 / 69μs lightning current A component waveform or the 3.2 / 34.5μs lightning current D component waveform, etc., used in direct lightning effect tests in the aviation field.

[0038] See Figure 3 , Figure 4 The temperature and humidity thresholds and multi-factor regression method for the dynamic conductivity properties of carbon fiber composites are shown below. 1) Analysis of the influence of humidity on the dynamic conductivity of carbon fiber composites: The humidity threshold for accelerated aging of the dynamic conductivity of carbon fiber composites was obtained, as well as the influence of humidity on the dynamic conductivity of carbon fiber composites.

[0039] (1) If the dynamic conductivity of carbon fiber composite material changes significantly under the humidity conditions during the increase of ambient humidity, the test point is to be reduced by 10%RH to the humidity and then retested; if the dynamic conductivity of carbon fiber composite material does not change under the new effective humidity conditions, the test point is to be increased by 5%RH, and so on, until the highest humidity threshold for accelerated aging of carbon fiber composite material is finally determined.

[0040] (2) Regression analysis is performed on the dynamic conductivity data obtained under effective humidity conditions. If the obtained scatter data is roughly linearly distributed, a linear regression equation is established. If the scatter data shows an increase followed by a relatively stable trend, a quadratic polynomial regression model can be established. If the scatter data shows an exponential change pattern, an exponential regression model is adopted.

[0041] 2) Analysis of the effect of temperature on the dynamic conductivity of carbon fiber composites: The temperature threshold for accelerated aging of the dynamic conductivity of carbon fiber composites was obtained, as well as the influence law of temperature on the dynamic conductivity of carbon fiber composites.

[0042] (1) If the dynamic conductivity of carbon fiber composite material changes significantly during the increase of ambient temperature, then the temperature minus 10℃ is used as the new effective temperature test point for testing; if the dynamic conductivity of carbon fiber composite material does not change at the new effective temperature, then the effective temperature point is increased by 5℃ for testing, and so on... Finally, the temperature threshold for accelerated aging of carbon fiber composite material is determined.

[0043] (2) Regression analysis is performed on the dynamic conductivity data obtained under effective temperature conditions. If the obtained scatter data is roughly linearly distributed, a linear regression equation is established. If the scatter data shows an increase followed by a relatively stable trend, a quadratic polynomial regression model can be established. If the scatter data shows an exponential change pattern, an exponential regression model is adopted.

[0044] 3) The influence of ambient temperature and humidity on the electrical conductivity of carbon fiber composite materials Based on the obtained influence of temperature and humidity on the dynamic conductivity of carbon fiber composite materials, a multi-factor regression model combining temperature and humidity was established.

[0045] Using dynamic conductivity test data of orthogonal carbon fiber composites under temperature and humidity, the influence of temperature and humidity on environmental aging and the multi-factor regression coefficients were calculated.

Claims

1. A multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composites, characterized in that... Includes the following steps: 1) An aging test of carbon fiber composite materials was conducted under constant ambient temperature and different humidity conditions to obtain test data samples on the effect of humidity on the dynamic conductivity of carbon fiber composite materials. 2) Aging tests of carbon fiber composite materials were conducted under constant ambient humidity and different temperature conditions to obtain test data samples on the effect of temperature on the dynamic conductivity of carbon fiber composite materials. 3) Obtain the temperature and humidity thresholds for environmental aging tests of carbon fiber composite materials, establish an evaluation model for the changes / influences of dynamic conductivity characteristics of carbon fiber composite materials, and determine the influence of temperature and humidity on the dynamic conductivity characteristics of carbon fiber composite materials. 4) Based on the obtained influence of temperature and humidity on the dynamic conductivity of carbon fiber composites, a multi-factor regression model combining temperature and humidity is established; using the dynamic conductivity test data of orthogonal carbon fiber composites based on temperature and humidity, the influence of temperature and humidity on environmental aging and the multi-factor regression coefficients are calculated.

2. The multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials according to claim 1, characterized in that: In step 1), under a constant ambient temperature, at least five humidity values ​​H1...H5, including the lowest and highest humidity values, are selected within an ambient humidity range of 10%RH to 99%RH for aging tests. The aging time for each humidity value is no less than 5000 hours, and no less than 100 dynamic conductivity test points are conducted within the aging time of each humidity value. The time intervals between the test points are equal or unequal, so as to obtain test data samples of the influence of humidity on the dynamic conductivity of carbon fiber composite materials at time nodes 1-100 under different humidity values ​​H1...H5.

3. The multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials according to claim 1, characterized in that: In step 2), under constant ambient humidity, at least five temperature values ​​T1 to T5, including the lowest and highest temperature values, are selected within the ambient temperature range of -30℃ to 200℃ for aging tests. The aging time for each temperature value is no less than 5000 hours, and no less than 100 dynamic conductivity test points are conducted within the aging time of each temperature value. The time intervals between the test points are equal or unequal, so as to obtain test data samples of the influence of the temperature at the 1st to 100th time nodes of different temperatures T1 to T5 on the dynamic conductivity of carbon fiber composite materials.

4. The multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials according to claim 1, characterized in that, Step 3) involves obtaining the humidity threshold for accelerated aging of the dynamic conductivity properties of carbon fiber composites and establishing a humidity change / impact assessment model for the dynamic conductivity properties of carbon fiber composites. The specific process includes: If, during step 1), the dynamic conductivity of the carbon fiber composite material changes significantly under the humidity conditions as the ambient temperature increases, then the test is repeated at a new effective humidity test point by subtracting 10%RH from the current humidity. If the dynamic conductivity of the carbon fiber composite material does not change under the new effective humidity conditions, then the test is repeated by adding 5%RH to the effective humidity value. This process continues until the highest humidity threshold for accelerated aging of the carbon fiber composite material is finally determined. Regression analysis was performed on the dynamic conductivity data obtained under effective humidity conditions. If the obtained scatter data showed a roughly linear distribution, a linear regression equation was established; if the scatter data showed an initial increase followed by a relatively stable trend, a quadratic polynomial regression model was established; if the scatter data showed an exponential change, an exponential regression model was established.

5. The multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials according to claim 1, characterized in that, Step 3) involves obtaining the temperature threshold for accelerated aging of the dynamic conductivity properties of carbon fiber composites and establishing a temperature change / impact assessment model for the dynamic conductivity properties of carbon fiber composites. The specific process includes: If, in step 2), the dynamic conductivity of the carbon fiber composite material undergoes significant distortion during the increase in ambient temperature, then 10°C is subtracted from this temperature to obtain a new effective temperature test point for testing; if the dynamic conductivity of the carbon fiber composite material does not change at this new effective temperature, then 5°C is added to this effective temperature point for testing, and so on... until the temperature threshold for accelerated aging of the carbon fiber composite material is finally determined. Regression analysis was performed on the dynamic conductivity data obtained under effective temperature conditions. If the obtained scatter data is roughly linearly distributed, a linear regression equation was established; if the scatter data shows an initial increase followed by a relatively stable trend, a quadratic polynomial regression model was established; if the scatter data shows an exponential change, an exponential regression model was established.

6. The multi-factor evaluation method for the influence of ambient temperature and humidity on the dynamic conductivity properties of carbon fiber composite materials according to claim 2 or 3, characterized in that: Repeat step 1) three times to reduce the dispersion of the sample and obtain dynamic conductivity data of carbon fiber composite material under constant temperature and five humidity levels. Repeat step 2) three times to reduce the dispersion of the sample and obtain dynamic conductivity data of carbon fiber composite material at constant humidity and five temperatures.

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