A method, device and equipment for evaluating residual strength of compressor impeller

Abstract

The present invention discloses a residual strength assessment method, device and equipment for a compressor impeller, and relates to the field of data processing technology. The method comprises: when a crack defect is detected in the compressor impeller, determining the defect size and defect type of the crack defect; wherein the defect type is a surface defect or an internal defect; using the defect size, calculating the defect area of ​​the crack defect; determining a geometric correction factor corresponding to the defect type; using a preset fatigue crack extension threshold value, the defect area and the geometric correction factor, calculating the maximum residual strength of the compressor impeller. The present invention can accurately reflect the actual operating conditions of the compressor impeller and improve the accuracy of the assessment results of the residual strength of the compressor impeller.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of data processing technology. More specifically, embodiments of the present invention relate to a method, device and equipment for evaluating the residual strength of a compressor impeller. Background Art

[0002] In the aviation industry, the performance and reliability of small aircraft engine compressor impellers are key components that are directly related to the overall operating efficiency and safety of the engine. During operation, the compressor impeller needs to withstand extremely high speeds and centrifugal loads, which makes its structural strength and fatigue life important considerations in the design process.

[0003] At present, the strength and fatigue life assessment of compressor impellers mainly relies on methods such as finite element analysis and experimental testing. However, with the continuous development of aero-engine technology, the performance requirements for compressor impellers are becoming higher and higher, and traditional assessment methods can no longer meet actual needs in some cases. In particular, after the compressor impeller has been running for a long time, tiny defects or cracks may appear inside it. These defects or cracks will gradually expand under the action of alternating loads, eventually leading to fatigue failure of the impeller.

[0004] In the existing technology, the residual strength assessment of the compressor impeller is usually carried out by detecting the stress distribution of the impeller. For example, the stress distribution of the impeller under specific working conditions can be obtained through finite element analysis, thereby determining the dangerous point of the impeller. However, the results of finite element analysis are limited by the model accuracy and calculation conditions, and cannot accurately reflect the real stress state inside the impeller, resulting in inaccurate assessment results of the residual strength of the compressor impeller. Summary of the invention

[0005] In this context, embodiments of the present invention are intended to provide a method, a device and an apparatus for evaluating the residual strength of a compressor impeller.

[0006] In a first aspect of an embodiment of the present invention, a method for evaluating residual strength of a compressor impeller is provided, the method comprising:

[0007] When a crack defect is detected in the compressor impeller, a defect radius and a defect type of the crack defect are determined; wherein the defect type is a surface defect or an internal defect;

[0008] Using the defect radius, calculating the defect area of ​​the crack defect;

[0009] determining a geometric correction factor corresponding to the defect type;

[0010] The maximum residual strength of the compressor impeller is calculated using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor.

[0011] The method of calculating the maximum residual strength of the compressor impeller by using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor includes:

[0012] Using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor, a residual strength prediction model is constructed; the residual strength prediction model is constructed based on a residual strength and defect radius curve;

[0013] Inputting the defect radius into the residual strength prediction model to obtain the target residual strength;

[0014] The target residual strength is determined as the maximum residual strength of the compressor impeller.

[0015] The residual strength prediction model is:

[0016] ;

[0017]

[0018] Wherein, Y is the geometric correction factor, is the defect area, is the defect radius, is the fatigue crack growth threshold, is the maximum stress.

[0019] The step of determining the defect radius and defect type of the crack defect includes:

[0020] determining a defect radius of the crack defect;

[0021] Determining a current location of the crack defect in the compressor impeller;

[0022] If the current position is located on the surface of the compressor impeller, determining the surface defect as the defect type;

[0023] If the current position is located inside the compressor impeller, an internal defect is determined as the defect type.

[0024] Determining the defect radius of the crack defect includes:

[0025] Determine a projection plane corresponding to the crack defect; wherein the projection plane is perpendicular to the tensile stress plane corresponding to the crack defect;

[0026] Projecting the crack defect onto the projection plane to obtain a crack defect image;

[0027] Determining a maximum length of the crack defect image;

[0028] The maximum length is used to calculate the defect radius of the crack defect.

[0029] The determining the maximum length of the crack defect image comprises:

[0030] Selecting multiple target points from the edge of the crack defect image; wherein the distance between any two target points is less than a preset distance threshold;

[0031] Combine each target point with each target point to obtain multiple target point groups;

[0032] Determine the target coordinates of each target point on the projection plane;

[0033] Based on the target coordinates of each target point, the current distance between two target points in each target point group is calculated;

[0034] The maximum current distance in the target point group is determined as the maximum length of the crack defect image.

[0035] Before calculating the maximum residual strength of the compressor impeller using the preset fatigue crack growth threshold value, the defect area and the geometric correction factor, the method further includes:

[0036] determining a target material for the compressor impeller and an operating temperature of the compressor impeller;

[0037] Determining a crack growth rate, a stress intensity factor range, a stress ratio, an elastic modulus, and a fracture toughness of the target material based on the operating temperature;

[0038] Constructing a fatigue crack growth threshold prediction model based on the crack growth rate, the stress intensity factor range, the stress ratio, the elastic modulus, and the fracture toughness;

[0039] The fatigue crack growth threshold value calculated using the fatigue crack growth threshold value prediction model is determined as a preset fatigue crack growth threshold value.

[0040] Based on the crack growth rate, the stress intensity factor range, the stress ratio, the elastic modulus and the fracture toughness, the fatigue crack growth threshold prediction model is constructed as follows:

[0041]

[0042] in, represents the crack growth rate, represents the stress intensity factor range, H represents the stress ratio, E represents the elastic modulus, represents the fracture toughness, is the fatigue crack growth threshold, represents the first preset parameter, Indicates the second preset parameter.

[0043] In a second aspect of an embodiment of the present invention, a residual strength assessment device for a compressor impeller is provided, the device comprising:

[0044] A first determination unit is used to determine the defect radius and defect type of the crack defect when a crack defect is detected in the compressor impeller; wherein the defect type is a surface defect or an internal defect;

[0045] A first calculation unit is used to calculate the defect area of ​​the crack defect using the defect radius;

[0046] A second determining unit, used to determine a geometric correction factor corresponding to the defect type;

[0047] The second calculation unit is used to calculate the maximum residual strength of the compressor impeller by using a preset fatigue crack extension threshold value, the defect area and the geometric correction factor.

[0048] In a third aspect of an embodiment of the present invention, a computing device is provided, comprising: at least one processor, a memory, and an input-output unit; wherein the memory is used to store a computer program, and the processor is used to call the computer program stored in the memory to execute any one of the methods described in the first aspect.

[0049] In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, which includes instructions, and when the instructions are executed on a computer, the computer executes the method described in any one of the first aspects.

[0050] In a fifth aspect of the embodiments of the present invention, a computer program product is provided, comprising a computer program, which implements any one of the methods in the first aspect when executed by a processor.

[0051] According to the residual strength assessment method, device and equipment of the compressor impeller of the embodiment of the present invention, when a crack defect is detected in the compressor impeller, the defect radius and defect type of the crack defect are determined; wherein the defect type is a surface defect or an internal defect; the defect area of ​​the crack defect is calculated using the defect radius; the geometric correction factor corresponding to the defect type is determined; the maximum residual strength of the compressor impeller is calculated using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor. This method can determine the maximum residual strength of the compressor impeller based on the calculated defect radius, combined with the geometric correction factor corresponding to the defect type and the preset fatigue crack extension threshold value when a crack defect is detected in the compressor impeller, thereby accurately reflecting the actual operating conditions of the compressor impeller and improving the accuracy of the assessment results of the residual strength of the compressor impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0053] Figure 1 A schematic flow chart of a method for evaluating the residual strength of a compressor impeller provided by the present invention;

[0054] Figure 2 A top view of the stress distribution of the compressor impeller under the centrifugal load provided by the present invention;

[0055] Figure 3 A side view of the stress distribution of the compressor impeller provided by the present invention under the action of centrifugal load;

[0056] Figure 4 A schematic diagram of the macroscopic morphology of a failed compressor impeller provided by the present invention;

[0057] Figure 5 A schematic diagram of the macroscopic morphology of cracks at the root of a compressor impeller provided by the present invention;

[0058] Figure 6 A schematic diagram of the microscopic morphology of cracks at the root of a compressor impeller provided by the present invention;

[0059] Figure 7 A schematic diagram of a residual strength prediction model provided by the present invention;

[0060] Figure 8 A schematic diagram of a residual strength prediction model for residual strength and internal critical crack radius provided by the present invention;

[0061] Fig. 9A schematic structural diagram of a residual strength assessment device for a compressor impeller provided by the present invention;

[0062] Fig.10 The structure diagram of a medium of the present invention is schematically shown;

[0063] Fig.11 A schematic diagram of the structure of a computing device of the present invention is shown schematically.

[0064] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0065] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0066] Those skilled in the art know that the embodiments of the present invention can be implemented as a system, device, apparatus, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0067] According to an embodiment of the present invention, a method, device and equipment for evaluating the residual strength of a compressor impeller are proposed.

[0068] It should be noted that any number of elements in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0069] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0070] Exemplary Methods

[0071] Reference below Figure 1 , Figure 1 A schematic flow chart of the residual strength evaluation method for a compressor impeller provided by the present invention. It should be noted that the embodiments of the present invention can be applied to any applicable scenario.

[0072] Figure 1 The process of the residual strength assessment method of the compressor impeller provided by the present invention includes:

[0073] Step 101, when a crack defect is detected in a compressor impeller, the defect radius and defect type of the crack defect are determined.

[0074] In the present invention, the compressor impeller is a rotating component of the compressor stage, which is mainly composed of a wheel and a moving blade. These components work together to achieve effective compression of air. The defect type is a surface defect or an internal defect.

[0075] For example, a finite element analysis is performed on a small aircraft engine compressor impeller at a working speed of 87000r / min and a temperature of 25°C. At the same time, vibration loads, aerodynamic loads, temperature change loads, and loads caused by assembly are not considered. Only the centrifugal load during operation is considered. The stress distribution is as follows: Figure 2 and Figure 3 shown. Figure 2 A top view of the stress distribution of the compressor impeller under the centrifugal load provided by the present invention; Figure 3 A side view of the stress distribution of the compressor impeller under the centrifugal load provided by the present invention; Figure 2 and Figure 3 It can be seen that the maximum Mises stress of the compressor impeller appears at the root of the blade, with a maximum value of 174MPa, and there is stress concentration at the fillet of the root of the blade, so the root of the blade is regarded as a dangerous point as the basis for calculation and testing. In addition, there is also stress concentration in the middle of the blade, with a maximum Mises stress of about 130MPa. Mises stress is an equivalent stress.

[0076] Please also read Figure 4~Figure 6 , Figure 4 A schematic diagram of the macroscopic morphology of a failed compressor impeller provided by the present invention; Figure 5 The macroscopic morphology of the crack at the root of the compressor impeller provided by the present invention is shown in FIG. Figure 4 As shown in the figure, there are two obvious fractures in the impeller (indicated by the dotted circle), located at the tip and root of the large blade. Further observation shows that the tip of the large blade has lost its corner, and the root of the large blade has a root crack. Cutting and magnifying the root crack, it is found that the cracks on both sides do not penetrate the entire material, such as Figure 5 The impeller as a whole and its fractured part were inspected several times, and no obvious signs of collision or scratches caused by contact with other metals were found.

[0077] Figure 6 The schematic diagram of the microscopic morphology of the crack at the root of the compressor impeller provided by the present invention; the sample at the root of the large blade of the impeller was magnified and observed by scanning electron microscope. Under low magnification, it was found that the crack source was located at the position of the dotted circle, and the morphology was as follows Figure 6 As shown in (a) in Figure 3, the crack source area can be further enlarged and the following can be observed: Figure 6 In the morphology shown in (b), the radial ridges starting from the crack source are clearly visible. Under high magnification, fatigue band characteristics can also be observed. Based on these characteristics, it can be determined that the fracture is a fatigue fracture. At the same time, observing the morphology of the knife mark on the side of the fracture, it can be seen that the knife mark is parallel to the crack surface ( Figure 6 (c) in the figure) and cleavage fracture occurred. Point scanning component analysis showed no obvious segregation ( Figure 6 (d) in Figure 2). Combined with the finite element calculation results, the tool mark forms a certain stress concentration at this position. Therefore, it can be inferred that the stress concentration at the processing tool mark and the blade root is the main cause of fatigue failure.

[0078] As an optional implementation manner, the method of determining the defect radius and defect type of the crack defect in step 101 may include:

[0079] determining a defect radius of the crack defect;

[0080] Determining a current location of the crack defect in the compressor impeller;

[0081] If the current position is located on the surface of the compressor impeller, determining the surface defect as the defect type;

[0082] If the current position is located inside the compressor impeller, an internal defect is determined as the defect type.

[0083] Among them, the implementation of this implementation method can accurately measure the defect radius of the crack defect, providing an accurate data basis for subsequent strength calculations and safety assessments. At the same time, by judging the current position of the crack defect in the compressor impeller, surface defects and internal defects can be accurately distinguished. For different types of defects, the degree of impact and treatment methods may vary significantly. Therefore, this implementation method not only improves the accuracy of defect identification, but also helps to take targeted repair or maintenance measures in the future to ensure the safe operation of the compressor impeller. In addition, this method simplifies the analysis process of crack defects and improves work efficiency, which is of great significance for the maintenance management and long-term use of compressor impellers.

[0084] As an optional implementation manner, a method of determining the defect radius of the crack defect may include:

[0085] Determine a projection plane corresponding to the crack defect; wherein the projection plane is perpendicular to the tensile stress plane corresponding to the crack defect;

[0086] Projecting the crack defect onto the projection plane to obtain a crack defect image;

[0087] Determining a maximum length of the crack defect image;

[0088] The maximum length is used to calculate the defect radius of the crack defect.

[0089] Among them, by implementing this implementation method, the accuracy and convenience of defect radius measurement are greatly improved by determining the projection plane corresponding to the crack defect and cleverly using projection technology to convert the crack defect into an image form that is easy to measure. The projection plane is perpendicular to the tensile stress plane corresponding to the crack defect, ensuring that the projection image can truly reflect the actual shape of the crack defect and avoiding measurement errors caused by angle deviation. By measuring the maximum length of the crack defect image and using this key data to calculate the defect radius, not only the measurement process is simplified, but also the accuracy of the measurement results is improved. This method provides reliable data support for the quantitative analysis and subsequent processing of crack defects, which helps to ensure the safety performance and stable operation of the compressor impeller.

[0090] In the present invention, the tensile stress plane refers to the plane where the maximum stress is generated when the material is subjected to tension. On this plane, the material will be subjected to the maximum stress and is also the place where cracking is most likely to occur.

[0091] In an embodiment of the present invention, the crack defect may be projected onto a projection plane to obtain a crack defect image. The crack defect image may be a closed figure or an irregular figure. The crack defect image may be a minimum figure including all the crack defects.

[0092] Optionally, the method of determining the maximum length of the crack defect image may include:

[0093] Selecting multiple target points from the edge of the crack defect image; wherein the distance between any two target points is less than a preset distance threshold;

[0094] Combine each target point with each target point to obtain multiple target point groups;

[0095] Determine the target coordinates of each target point on the projection plane;

[0096] Based on the target coordinates of each target point, the current distance between two target points in each target point group is calculated;

[0097] The maximum current distance in the target point group is determined as the maximum length of the crack defect image.

[0098] Among them, by implementing this implementation method, by carefully selecting multiple target points from the edge of the crack defect image and ensuring that the distance between any two target points is less than the preset distance threshold, the measurement error caused by the selected points being too sparse or too concentrated is effectively avoided. By combining these target points to form multiple groups of target point groups, and calculating the current distance between two target points in each group based on the precise coordinates of each target point, the size characteristics of the crack defect image can be captured comprehensively and meticulously. Finally, the maximum current distance in the target point group is determined as the maximum length of the crack defect image, which not only improves the accuracy of the measurement, but also ensures the reliability of this key data. This method provides strong support for the precise analysis and subsequent processing of crack defects, and helps to improve the safety performance and service life of the compressor impeller.

[0099] Step 102: Using the defect radius, calculate the defect area of ​​the crack defect.

[0100] Exemplarily, the calculation formula for the defect area of ​​the crack defect may be:

[0101] ;

[0102] in, is the defect area, is the defect radius.

[0103] Step 103: Determine a geometric correction factor corresponding to the defect type.

[0104] Exemplarily, for surface defects, the geometric correction factor may be 0.65, and for internal defects, the geometric correction factor may be Y=0.5.

[0105] Step 104: Calculate the maximum residual strength of the compressor impeller using the preset fatigue crack growth threshold value, the defect area, and the geometric correction factor.

[0106] For example, the fatigue crack growth threshold value refers to the stress intensity factor alternating value at which a cracked component will not grow fatigued under alternating loads. The preset fatigue crack growth threshold value can be .

[0107] As an optional implementation, before step 104, the following steps may also be performed:

[0108] determining a target material for the compressor impeller and an operating temperature of the compressor impeller;

[0109] Determining a crack growth rate, a stress intensity factor range, a stress ratio, an elastic modulus, and a fracture toughness of the target material based on the operating temperature;

[0110] Constructing a fatigue crack growth threshold prediction model based on the crack growth rate, the stress intensity factor range, the stress ratio, the elastic modulus, and the fracture toughness;

[0111] The fatigue crack growth threshold value calculated using the fatigue crack growth threshold value prediction model is determined as a preset fatigue crack growth threshold value.

[0112] Among them, by implementing this implementation method, by comprehensively considering the target material and operating temperature of the compressor impeller, key parameters such as the crack growth rate, stress intensity factor range, stress ratio, elastic modulus and fracture toughness of the material can be accurately determined. These parameters are the basis for constructing a fatigue crack growth threshold prediction model, which is crucial for accurately evaluating the threshold conditions for crack growth. By constructing and applying this equation, the fatigue crack growth threshold that conforms to the actual situation can be calculated and used as a preset value for subsequent maximum residual strength calculations. This method not only improves the accuracy and scientificity of the calculation, but also helps to more comprehensively understand the fatigue behavior of the compressor impeller under a specific working environment, and provides strong technical support for the safety assessment and maintenance management of the compressor impeller.

[0113] Exemplarily, based on the crack growth rate, the stress intensity factor range, the stress ratio, the elastic modulus and the fracture toughness, the fatigue crack growth threshold prediction model constructed is:

[0114]

[0115] in, represents the crack growth rate, represents the stress intensity factor range, H represents the stress ratio, E represents the elastic modulus, represents the fracture toughness, is the fatigue crack growth threshold, represents the first preset parameter, Indicates the second preset parameter.

[0116] It is understood that the crack growth rate refers to the speed at which a crack grows in a material or structure, usually expressed as the length or area of ​​crack growth per unit time. It reflects the speed at which cracks develop in a material during stress and is one of the key indicators for evaluating the fatigue performance of a material.

[0117] The stress intensity factor is a parameter that characterizes the strength of the stress field near the crack tip of an elastic object under the action of external force. It reflects the strength of the elastic stress field at the crack tip and is closely related to the crack size, component geometry and load. According to the different crack opening modes, the stress intensity factor can be divided into three basic types: type I (opening type), type II (sliding type) and type III (tearing type).

[0118] The stress ratio refers to the ratio of the minimum load to the maximum load (or the ratio of the minimum stress to the maximum stress) of the specimen during cyclic loading. Some literature also calls it the cyclic characteristic coefficient. In soil mechanics, the definition of stress ratio has been expanded to refer to the ratio of generalized shear stress q to spherical stress p, or the ratio of dynamic shear stress to consolidation stress.

[0119] The general definition of elastic modulus is: the ratio of stress to the corresponding strain under uniaxial stress state.

[0120] Fracture toughness refers to the critical stress intensity factor when cracks in a material or structure grow rapidly and uncontrollably. It measures the material's ability to resist fracture when cracks are present and is an important parameter for evaluating the material's ability to resist crack growth. Fracture toughness is particularly important for safety assessment of large structures (such as ship hulls, bridges, etc.) because it is directly related to the stability and durability of the structure under crack growth.

[0121] Further optionally, considering that in some special materials (such as polymer materials with nonlinear viscoelasticity) or extreme working conditions (such as high strain rate loading), there may be a nonlinear relationship between the crack growth rate and parameters such as the stress intensity factor range and stress ratio, nonlinear terms such as high-order power terms and cross terms are appropriately introduced on the basis of the fatigue crack growth threshold prediction model. For example, high-order power terms can be added, and then regression analysis can be performed through a large amount of experimental data to determine the coefficients of these nonlinear terms, so that the model can better fit the variation law of the fatigue crack growth threshold under complex conditions, thereby improving the versatility and accuracy of the model.

[0122] Specifically, in special materials or extreme working conditions, traditional linear prediction models are difficult to accurately describe the complex behavior of crack growth. For example, for polymer materials with nonlinear viscoelasticity, their internal microstructure will undergo complex changes during the stress process, resulting in a nonlinear relationship between crack growth rate and parameters such as the stress intensity factor range. Taking the addition of quadratic terms as an example, when the stress intensity factor range increases, the influence of this term will gradually become more prominent, allowing the model to capture the accelerated change trend of crack growth rate under high stress intensity factors.

[0123] When determining the coefficients of these nonlinear terms, a systematic experimental design must be carried out first. For different nonlinear terms, multiple groups of experiments are designed. In the experiments, parameters such as stress ratio, elastic modulus, fracture toughness, etc. are precisely controlled to remain unchanged or change according to specific rules. At the same time, the crack growth rate under different stress intensity factor ranges is measured to obtain enough data points. Then, the multivariate nonlinear regression analysis method is used to substitute the experimental data into the prediction model containing nonlinear terms, and the coefficients are solved by optimization algorithms such as the least squares method to minimize the error between the model prediction value and the experimental measurement value. In the process of regression analysis, the data also needs to be preprocessed, such as checking the normality of the data, removing outliers, etc., to improve the reliability of the regression results.

[0124] Further optionally, in a thermal-mechanical coupling environment, changes in temperature can affect the mechanical properties of the material, thereby changing the characteristics of crack propagation. When the temperature rises, the elastic modulus of the material may decrease, and the thermal stress will be superimposed on the stress generated by the external load, affecting the stress intensity factor at the crack tip. For example, in the fatigue analysis of aircraft engine blades, the blades are subjected to mechanical loads such as centrifugal force in a high-temperature gas environment, and the thermal-mechanical coupling effect is significant. After adding the product term of temperature and stress intensity factor, the coefficient of this term is determined by a specially designed thermal-mechanical coupling experiment. In the experiment, a heating device is used to accurately control the temperature of the specimen, and a cyclic mechanical load is applied using a loading device to measure the crack propagation under different temperature and load combinations. According to the experimental data, the coefficient form and value range are determined by combining theoretical analysis and data fitting. The theoretical influence relationship of temperature on stress intensity factor can be derived based on the thermoelastic theory, and then the coefficient in the theoretical formula can be corrected by experimental data, so that the model can accurately reflect the influence of thermal-mechanical coupling on the threshold value of fatigue crack propagation.

[0125] In addition, it can be further found that the energy release rate at the crack tip is related to the stress intensity factor (for plane strain conditions), where is the elastic modulus of the material. During fatigue crack growth, the energy release rate is closely related to the crack growth threshold. When considering the influence of stress ratio, according to existing experimental and theoretical studies, the stress ratio will change the degree of crack closure, thereby affecting the effective stress intensity factor at the crack tip. For example, under low stress ratio conditions, the crack closure effect is small and the crack is more likely to grow. The correction of the stress intensity factor range correlation coefficient should reflect this sensitivity change. Combining theoretical formulas with a large amount of experimental data, a correction formula for the stress intensity factor range correlation coefficient under different stress ratios can be derived. For example, for a certain type of metal material, it is found through experiments that when the stress ratio is in the range of 0-0.3, the stress intensity factor range correlation coefficient should be multiplied by a correction factor related to the stress ratio. This factor can be obtained by fitting the fatigue crack growth experimental data under different stress ratios, so that the coefficients in the fatigue crack growth threshold prediction model are more in line with the actual physical situation, improving the rationality and reliability of the model prediction.

[0126] As an optional implementation, step 104 uses the preset fatigue crack extension threshold value, the defect area and the geometric correction factor to calculate the maximum residual strength of the compressor impeller in a manner that may include:

[0127] Using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor, a residual strength prediction model is constructed; the residual strength prediction model is constructed based on a residual strength and defect radius curve;

[0128] Inputting the defect radius into the residual strength prediction model to obtain the target residual strength;

[0129] The target residual strength is determined as the maximum residual strength of the compressor impeller.

[0130] Among them, by implementing this implementation method, by combining the preset fatigue crack extension threshold value, defect area and geometric correction factor, the curve equation between the residual strength and the defect radius can be accurately constructed. This step fully considers the threshold conditions for crack extension, the actual size of the defect and the geometric influence of the defect shape, thereby improving the accuracy and reliability of the residual strength calculation. By inputting the specific defect radius value into the curve equation, the target residual strength can be quickly obtained, and then it can be determined as the maximum residual strength of the compressor impeller. This method not only simplifies the calculation process, but also avoids the possible empirical judgment errors in the traditional method, providing a more scientific basis for the remaining life assessment and safety analysis of the compressor impeller.

[0131] Exemplarily, the residual strength prediction model is:

[0132] ;

[0133] ;

[0134] Wherein, Y is the geometric correction factor, is the defect area, is the defect radius, is the fatigue crack growth threshold, is the maximum stress.

[0135] Furthermore, from the above formula we can get:

[0136]

[0137] This formula can more directly express the relationship between residual strength and defect radius.

[0138] Please also read Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the residual strength prediction model provided by the present invention; in the figure, when the residual strength is 250MPa, the critical surface defect radius is 61.3μm.

[0139] Figure 8 A schematic diagram of a residual strength prediction model for residual strength and internal critical crack radius provided by the present invention; in the figure, when the residual strength is 250 MPa, the internal critical defect radius is 104 μm.

[0140] The present invention can accurately reflect the actual operating conditions of the compressor impeller and improve the accuracy of the evaluation results of the residual strength of the compressor impeller. In addition, the present invention can also improve the accuracy of defect identification, which is helpful for subsequent targeted repair or maintenance measures to ensure the safe operation of the compressor impeller. In addition, the present invention can also simplify the measurement process and improve the accuracy of the measurement results. In addition, the present invention can also improve the accuracy of the measurement and ensure the reliability of the maximum length of the crack defect image. In addition, the present invention can also improve the accuracy and scientificity of the calculation, which is helpful for a more comprehensive understanding of the fatigue behavior of the compressor impeller under a specific working environment, and provides strong technical support for the safety assessment and maintenance management of the compressor impeller. In addition, the present invention can also avoid the empirical judgment errors that may exist in traditional methods, and provide a more scientific basis for the remaining life assessment and safety analysis of the compressor impeller.

[0141] After introducing the method of the exemplary embodiment of the present invention, next, refer to Fig. 9 A residual strength evaluation device for a compressor impeller according to an exemplary embodiment of the present invention is described, the device comprising:

[0142] The first determination unit 901 is used to determine the defect radius and defect type of the crack defect when a crack defect is detected in the compressor impeller; wherein the defect type is a surface defect or an internal defect;

[0143] A first calculation unit 902 is used to calculate the defect area of ​​the crack defect using the defect radius;

[0144] A second determining unit 903 is used to determine a geometric correction factor corresponding to the defect type;

[0145] The second calculation unit 904 is used to calculate the maximum residual strength of the compressor impeller by using the preset fatigue crack growth threshold value, the defect area and the geometric correction factor.

[0146] As an optional implementation manner, the second calculation unit 904 uses the preset fatigue crack extension threshold value, the defect area and the geometric correction factor to calculate the maximum residual strength of the compressor impeller in the following manner:

[0147] Using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor, a residual strength prediction model is constructed; the residual strength prediction model is constructed based on a residual strength and defect radius curve;

[0148] Inputting the defect radius into the residual strength prediction model to obtain the target residual strength;

[0149] The target residual strength is determined as the maximum residual strength of the compressor impeller.

[0150] Among them, by implementing this implementation method, by combining the preset fatigue crack extension threshold value, defect area and geometric correction factor, the curve equation between the residual strength and the defect radius can be accurately constructed. This step fully considers the threshold conditions for crack extension, the actual size of the defect and the geometric influence of the defect shape, thereby improving the accuracy and reliability of the residual strength calculation. By inputting the specific defect radius value into the curve equation, the target residual strength can be quickly obtained, and then it can be determined as the maximum residual strength of the compressor impeller. This method not only simplifies the calculation process, but also avoids the possible empirical judgment errors in the traditional method, providing a more scientific basis for the remaining life assessment and safety analysis of the compressor impeller.

[0151] As an optional implementation, the residual strength prediction model is:

[0152] ;

[0153] ;

[0154] Wherein, Y is the geometric correction factor, is the defect area, is the defect radius, is the fatigue crack growth threshold, is the maximum stress.

[0155] As an optional implementation manner, the first determining unit 901 determines the defect radius and defect type of the crack defect in the following manner:

[0156] determining a defect radius of the crack defect;

[0157] Determining a current location of the crack defect in the compressor impeller;

[0158] If the current position is located on the surface of the compressor impeller, determining the surface defect as the defect type;

[0159] If the current position is located inside the compressor impeller, an internal defect is determined as the defect type.

[0160] Among them, the implementation of this implementation method can accurately measure the defect radius of the crack defect, providing an accurate data basis for subsequent strength calculations and safety assessments. At the same time, by judging the current position of the crack defect in the compressor impeller, surface defects and internal defects can be accurately distinguished. For different types of defects, the degree of impact and treatment methods may be significantly different. Therefore, this implementation method not only improves the accuracy of defect identification, but also helps to take targeted repair or maintenance measures in the future to ensure the safe operation of the compressor impeller. In addition, this method simplifies the analysis process of crack defects and improves work efficiency, which is of great significance for the maintenance management and long-term use of compressor impellers.

[0161] As an optional implementation manner, the first determining unit 901 determines the defect radius of the crack defect in the following manner:

[0162] Determine a projection plane corresponding to the crack defect; wherein the projection plane is perpendicular to the tensile stress plane corresponding to the crack defect;

[0163] Projecting the crack defect onto the projection plane to obtain a crack defect image;

[0164] Determining a maximum length of the crack defect image;

[0165] The maximum length is used to calculate the defect radius of the crack defect.

[0166] Among them, by implementing this implementation method, the accuracy and convenience of defect radius measurement are greatly improved by determining the projection plane corresponding to the crack defect and cleverly using projection technology to convert the crack defect into an image form that is easy to measure. The projection plane is perpendicular to the tensile stress plane corresponding to the crack defect, ensuring that the projection image can truly reflect the actual shape of the crack defect and avoiding measurement errors caused by angle deviation. By measuring the maximum length of the crack defect image and using this key data to calculate the defect radius, not only the measurement process is simplified, but also the accuracy of the measurement results is improved. This method provides reliable data support for the quantitative analysis and subsequent processing of crack defects, which helps to ensure the safety performance and stable operation of the compressor impeller.

[0167] As an optional implementation manner, the first determining unit 901 determines the maximum length of the crack defect image in the following manner:

[0168] Selecting multiple target points from the edge of the crack defect image; wherein the distance between any two target points is less than a preset distance threshold;

[0169] Combine each target point with each target point to obtain multiple target point groups;

[0170] Determine the target coordinates of each target point on the projection plane;

[0171] Based on the target coordinates of each target point, the current distance between two target points in each target point group is calculated;

[0172] The maximum current distance in the target point group is determined as the maximum length of the crack defect image.

[0173] Among them, by implementing this implementation method, by carefully selecting multiple target points from the edge of the crack defect image and ensuring that the distance between any two target points is less than the preset distance threshold, the measurement error caused by the selected points being too sparse or too concentrated is effectively avoided. By combining these target points to form multiple groups of target point groups, and calculating the current distance between two target points in each group based on the precise coordinates of each target point, the size characteristics of the crack defect image can be captured comprehensively and meticulously. Finally, the maximum current distance in the target point group is determined as the maximum length of the crack defect image, which not only improves the accuracy of the measurement, but also ensures the reliability of this key data. This method provides strong support for the precise analysis and subsequent processing of crack defects, and helps to improve the safety performance and service life of the compressor impeller.

[0174] As an optional implementation manner, the second calculating unit 904 is further configured to:

[0175] Before calculating the maximum residual strength of the compressor impeller using the preset fatigue crack growth threshold value, the defect area and the geometric correction factor, determining a target material of the compressor impeller and an operating temperature of the compressor impeller;

[0176] Determining a crack growth rate, a stress intensity factor range, a stress ratio, an elastic modulus, and a fracture toughness of the target material based on the operating temperature;

[0177] Constructing a fatigue crack growth threshold prediction model based on the crack growth rate, the stress intensity factor range, the stress ratio, the elastic modulus, and the fracture toughness;

[0178] The fatigue crack growth threshold value calculated using the fatigue crack growth threshold value prediction model is determined as a preset fatigue crack growth threshold value.

[0179] Among them, by implementing this implementation method, by comprehensively considering the target material and operating temperature of the compressor impeller, key parameters such as the crack growth rate, stress intensity factor range, stress ratio, elastic modulus and fracture toughness of the material can be accurately determined. These parameters are the basis for constructing a fatigue crack growth threshold prediction model, which is crucial for accurately evaluating the threshold conditions for crack growth. By constructing and applying this equation, the fatigue crack growth threshold that conforms to the actual situation can be calculated and used as a preset value for subsequent maximum residual strength calculations. This method not only improves the accuracy and scientificity of the calculation, but also helps to more comprehensively understand the fatigue behavior of the compressor impeller under a specific working environment, and provides strong technical support for the safety assessment and maintenance management of the compressor impeller.

[0180] In the present invention, based on the crack growth rate, the stress intensity factor range, the stress ratio, the elastic modulus and the fracture toughness, the fatigue crack growth threshold prediction model is constructed as follows:

[0181]

[0182] in, represents the crack growth rate, represents the stress intensity factor range, H represents the stress ratio, E represents the elastic modulus, represents the fracture toughness, is the fatigue crack growth threshold, represents the first preset parameter, Indicates the second preset parameter.

[0183] The present invention can accurately reflect the actual operating conditions of the compressor impeller and improve the accuracy of the evaluation results of the residual strength of the compressor impeller. In addition, the present invention can also improve the accuracy of defect identification, which is helpful for subsequent targeted repair or maintenance measures to ensure the safe operation of the compressor impeller. In addition, the present invention can also simplify the measurement process and improve the accuracy of the measurement results. In addition, the present invention can also improve the accuracy of the measurement and ensure the reliability of the maximum length of the crack defect image. In addition, the present invention can also improve the accuracy and scientificity of the calculation, which is helpful for a more comprehensive understanding of the fatigue behavior of the compressor impeller under a specific working environment, and provides strong technical support for the safety assessment and maintenance management of the compressor impeller. In addition, the present invention can also avoid the empirical judgment errors that may exist in traditional methods, and provide a more scientific basis for the remaining life assessment and safety analysis of the compressor impeller.

[0184] After introducing the method and apparatus of the exemplary embodiment of the present invention, next, reference is made to Fig.10 For a description of a computer-readable storage medium according to an exemplary embodiment of the present invention, please refer to Fig.10 , the computer-readable storage medium shown is a CD 100, on which a computer program (i.e., a program product) is stored. When the computer program is executed by the processor, the steps recorded in the above method implementation are implemented, for example, when a crack defect is detected in the compressor impeller, the defect radius and defect type of the crack defect are determined; wherein the defect type is a surface defect or an internal defect; using the defect radius, the defect area of ​​the crack defect is calculated; determining a geometric correction factor corresponding to the defect type; using a preset fatigue crack extension threshold value, the defect area and the geometric correction factor, the maximum residual strength of the compressor impeller is calculated; the specific implementation method of each step is not repeated here.

[0185] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0186] After introducing the method, apparatus and medium of the exemplary embodiments of the present invention, next, reference is made to Fig.11 A computing device for residual strength evaluation of a compressor impeller according to an exemplary embodiment of the present invention.

[0187] Fig.11A block diagram of an exemplary computing device 110 suitable for implementing embodiments of the present invention is shown, and the computing device 110 may be a computer system or a server. Fig.11 The computing device 110 shown is only an example and should not bring any limitation to the functionality and scope of use of the embodiments of the present invention.

[0188] like Fig.11 As shown, the components of the computing device 110 may include, but are not limited to: one or more processors or processing units 1101 , a system memory 1102 , and a bus 1103 connecting various system components (including the system memory 1102 and the processing unit 1101 ).

[0189] The computing device 110 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computing device 110, including volatile and nonvolatile media, removable and non-removable media.

[0190] The system memory 1102 may include computer system readable media in the form of volatile memory, such as random access memory 11021 and / or cache memory 11022. The computing device 110 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the read-only memory 11023 may be used to read and write non-removable, non-volatile magnetic media ( Fig.11 is not shown in the Fig.11 As shown in FIG. 1 , a disk drive for reading and writing a removable non-volatile disk (e.g., a "floppy disk") and an optical disk drive for reading and writing a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 1103 via one or more data medium interfaces. The system memory 1102 may include at least one program product, which has a set (e.g., at least one) of program modules, which are configured to perform the functions of the various embodiments of the present invention.

[0191] A program / utility 11025 having a set (at least one) of program modules 11024 may be stored, for example, in system memory 1102, and such program modules 11024 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. Program modules 11024 generally perform the functions and / or methods of the embodiments described herein.

[0192] The computing device 110 may also communicate with one or more external devices 1104 (e.g., a keyboard, a pointing device, a display, etc.). Such communication may be performed via an input / output interface 1105. In addition, the computing device 110 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 1106. Fig.11 As shown, the network adapter 1106 communicates with other modules (such as the processing unit 1101, etc.) of the computing device 110 via the bus 1103. It should be understood that although Fig.11 Not shown, other hardware and / or software modules may be used in conjunction with computing device 110 .

[0193] The processing unit 1101 executes various functional applications and data processing by running the program stored in the system memory 1102. For example, when a crack defect is detected in the compressor impeller, the defect radius and defect type of the crack defect are determined; wherein the defect type is a surface defect or an internal defect; using the defect radius, the defect area of ​​the crack defect is calculated; determining the geometric correction factor corresponding to the defect type; using the preset fatigue crack extension threshold value, the defect area and the geometric correction factor, the maximum residual strength of the compressor impeller is calculated. The specific implementation of each step is not repeated here. It should be noted that although several units / modules or sub-units / sub-modules of the residual strength assessment device of the compressor impeller are mentioned in the above detailed description, this division is only exemplary and not mandatory. In fact, according to an embodiment of the present invention, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided into multiple units / modules for embodiment.

[0194] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0195] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0196] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0197] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0198] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0199] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that can be executed by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., various media that can store program codes.

[0200] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate 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. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

[0201] In addition, although the operations of the method of the present invention are described in a specific order in the drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0202] In an exemplary embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

Claims

1. A method for evaluating the residual strength of a compressor impeller, characterized in that: include: When a crack defect is detected in the impeller of the press machine, the defect size and defect type of the crack defect are determined; wherein the defect type is a surface defect or an internal defect; Calculating the defect area of ​​the crack defect according to the defect radius of the crack defect; determining a geometric correction factor corresponding to the defect type; The maximum residual strength of the compressor impeller is calculated using the preset fatigue crack growth threshold value, defect area and geometric correction factor; wherein the maximum residual strength of the compressor impeller is predicted using a residual strength prediction model; the residual strength prediction model is constructed using the preset fatigue crack growth threshold value, defect area and geometric correction factor; the residual strength prediction model is expressed as the following formula: area s =πr 2 ; Where Y is the geometric correction factor, area s is the defect area, r is the defect radius, ΔK th is the fatigue crack growth threshold, σ max is the maximum stress; Before calculating the maximum residual strength of the compressor impeller using the preset fatigue crack growth threshold value, defect area and geometric correction factor, the method further includes: determining a target material of the compressor impeller and an operating temperature of the compressor impeller; Determine the crack growth rate, stress intensity factor range, stress ratio, elastic modulus, and fracture toughness of the target material based on the operating temperature; Based on the crack growth rate, stress intensity factor range, stress ratio, elastic modulus and fracture toughness, the fatigue crack growth threshold prediction model is constructed as follows: in, represents the crack growth rate, ΔK represents the stress intensity factor range, H represents the stress ratio, E represents the elastic modulus, and K a represents fracture toughness, ΔK th is the fatigue crack extension threshold, b1 represents the first preset parameter, and b2 represents the second preset parameter.

2. The residual strength evaluation method of a compressor impeller according to claim 1, characterized in that: Using the preset fatigue crack growth threshold, defect area and geometric correction factor, the maximum residual strength of the compressor impeller is calculated, including: The residual strength prediction model is constructed using the preset fatigue crack extension threshold value, defect area and geometric correction factor; the residual strength prediction model is constructed based on the residual strength and defect radius curve; Inputting the defect radius into the residual strength prediction model to obtain the target residual strength; The target residual strength is determined as the maximum residual strength of the compressor impeller.

3. The residual strength evaluation method of a compressor impeller according to any one of claims 1 to 2, characterized in that: Determining the defect size and defect type of the crack defect, including: Determine the defect radius of the crack defect; determining a current location of a crack defect in the compressor impeller; If the current position is located on the surface of the compressor impeller, the surface defect is determined as the defect type; If the current position is located inside the compressor impeller, an internal defect is determined as the defect type.

4. The residual strength evaluation method of a compressor impeller according to claim 3, characterized in that: Determining the defect radius of the crack defect includes: Determine a projection plane corresponding to the crack defect; wherein the projection plane is perpendicular to the tensile stress plane corresponding to the crack defect; Projecting the crack defect onto the projection plane to obtain a crack defect image; Determine the maximum length of the crack defect image; Using the maximum length, the defect radius of the crack defect is calculated.

5. The residual strength evaluation method of a compressor impeller according to claim 4, characterized in that: Determining the maximum length of the crack defect image includes: Selecting multiple target points from the edge of the crack defect image; wherein the distance between any two target points is less than a preset distance threshold; Combine each target point with each target point to obtain multiple target point groups; Determine the target coordinates of each target point on the projection plane; Based on the target coordinates of each target point, the current distance between two target points in each target point group is calculated; The maximum current distance in the target point group is determined as the maximum length of the crack defect image.

6. The residual strength evaluation method of a compressor impeller according to any one of claims 1 to 2, characterized in that: Before calculating the maximum residual strength of the compressor impeller using the preset fatigue crack growth threshold value, defect area and geometric correction factor, the method further includes: Based on the crack growth rate, stress intensity factor range, stress ratio, elastic modulus and fracture toughness, a fatigue crack growth threshold prediction model is constructed; The fatigue crack growth threshold value calculated using the fatigue crack growth threshold value prediction model is determined as the preset fatigue crack growth threshold value.

7. A residual strength assessment device for a compressor impeller, characterized in that: include: A first determination unit is used to determine the defect radius and defect type of the crack defect when a crack defect is detected in the impeller of the press machine; wherein the defect type is a surface defect or an internal defect; A first calculation unit is used for calculating the defect radius and obtaining the defect area of ​​the crack defect; A second determination unit, used to determine a geometric correction factor corresponding to the defect type; The second calculation unit is used to calculate the maximum residual strength of the compressor impeller by using a preset fatigue crack growth threshold value, defect area and geometric correction factor; wherein the maximum residual strength of the compressor impeller is predicted by using a residual strength prediction model; the residual strength prediction model is constructed by using a preset fatigue crack growth threshold value, defect area and geometric correction factor; the residual strength prediction model is expressed as the following formula: area s =πr 2 ; Among them, Y is the geometric correction factor, area s is the defect area, r is the defect radius, ΔK th is the fatigue crack growth threshold, σ max is the maximum stress; The second calculation unit is further used to determine the target material of the compressor impeller and the operating temperature of the compressor impeller before calculating the maximum residual strength of the compressor impeller using the preset fatigue crack growth threshold value, the defect area and the geometric correction factor; based on the operating temperature, determine the crack growth rate, stress intensity factor range, stress ratio, elastic modulus and fracture toughness of the target material; based on the crack growth rate, stress intensity factor range, stress ratio, elastic modulus and fracture toughness, the fatigue crack growth threshold prediction model constructed is: in, represents the crack growth rate, ΔK represents the stress intensity factor range, H represents the stress ratio, E represents the elastic modulus, and K a represents fracture toughness, ΔK th is the fatigue crack extension threshold, b1 represents the first preset parameter, and b2 represents the second preset parameter.

8. A computing device, comprising: at least one processor, memory, and input-output unit; The memory is used to store a computer program, and the processor is used to call the computer program stored in the memory to execute the method according to any one of claims 1 to 6.

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