A method and system for determining fracture life based on bone point stress concept

Abstract

The present invention relates to a fracture life determination method and system based on the bone point stress concept. The fracture life determination method provided by the present invention uses the bone point stress concept to correlate the Sdoybrev-Hayhurst-Leckie stress-representing fracture criterion and the Cane stress-representing fracture criterion to obtain a conversion model. The method then predicts creep rupture life based on the conversion model. This method provides a theoretical foundation for the mutual conversion of two multiaxial creep rupture criteria, thereby avoiding the prediction error of multiaxial creep rupture life caused by linear conversion, thereby achieving the purpose of improving the prediction accuracy of multiaxial creep rupture life.

Description

Technical Field

[0001] The present invention relates to the technical field of creep rupture life detection, and in particular to a method and system for determining rupture life based on the concept of bone point stress. Background Art

[0002] Multiaxial creep rupture life prediction is the basis for evaluating the structural integrity of high-temperature components. Multiaxial creep rupture life prediction requires first determining the multiaxial stress rupture criterion for the material to be evaluated. Commonly used criteria include the Sdoybrev-Hayhurst-Leckie criterion and the Cane criterion.

[0003] Under uniaxial stress, the creep rupture life prediction formula is as follows:

[0004] t ru =Mσ -m (1)

[0005] where t ru is the uniaxial fracture life, M and m are the coefficient and stress exponent respectively, and σ is the applied stress.

[0006] Analogous to the creep rupture prediction formula under uniaxial stress (i.e., formula (1)), the creep rupture prediction formula under multiaxial stress can be expressed as:

[0007]

[0008] where t rn is the multiaxial fracture life, σ rep To represent stress, it is usually expressed as a combination (linear or product form) of the maximum principal stress (maximum rincipal stress) and the von Mises equivalent stress (von Mises equivalent stress).

[0009] The representative stress of the Sdoybrev-Hayhurst-Leckie criterion can be expressed as a linear combination of the maximum principal stress and the von Mises equivalent stress, while the representative stress of the Cane criterion can be expressed as the product of the above two stresses. The definitions of the two representative stresses are as follows:

[0010] σ rep =ασ I +(1-α)σ eq (3)

[0011] σ rep =σ eq (σ I / σ eq ) γ / m (4)

[0012] For the Sdoybrev-Hayhurst-Leckie representative stress, the multiaxial creep rupture performance parameter is usually represented by the Greek letter α. For the Cane representative stress, the multiaxial creep rupture performance parameter is usually represented by the ratio γ / m, where the γ value is obtained by multiaxial stress testing and m is obtained by uniaxial creep testing.

[0013] In order to realize the multi-axial creep rupture life prediction, the existing technology can only substitute any one of the representative stresses of formula (3) and formula (4) into formula (2) to obtain the creep rupture life under multi-axial stress. However, this will lead to the problem that the life error results obtained by detection are not accurate enough.

[0014] If a simple linear transformation method is used, that is, assuming that the α value and the γ / m value are equal, the two predicted results will be consistent in some cases, but in other cases there will be a large deviation. Specifically, on the one hand, when the multiaxial creep rupture life of the material is close to the maximum principal stress or the vonMises equivalent stress, that is, when the α value and the γ / m value are both equal to 0 or 1, the above two representative stresses are almost equivalent; on the other hand, when the contribution of the maximum principal stress and the vonMises equivalent stress to the multiaxial creep rupture life cannot be ignored, that is, when the α value and the γ / m value are close to 0.5, there is a significant difference between the above two representative stresses. At this time, the two representative stresses cannot give consistent multiaxial creep rupture prediction results due to the prediction error, which in turn leads to the inability to accurately obtain the prediction results of the multiaxial creep rupture life. Summary of the Invention

[0015] In order to solve the above problems existing in the prior art, the present invention provides a fracture life determination method and system based on the bone point stress concept, which can achieve the purpose of improving the prediction accuracy of multi-axial creep fracture life.

[0016] To achieve the above object, the present invention provides the following solutions:

[0017] A method for determining fracture life based on the bone point stress concept, comprising:

[0018] Determine the transformation model based on the bone point stress concept;

[0019] Obtain the Cane representative stress of the component to be tested;

[0020] Using the Cane representative stress of the component to be tested, the Sdoybrev-Hayhurst-Leckie representative stress of the component to be tested is obtained based on the conversion model;

[0021] The creep rupture life of the component to be tested is determined according to the Sdoybrev-Hayhurst-Leckie representative stress of the component to be tested.

[0022] Preferably, obtaining the Cane representative stress of the component to be inspected specifically includes:

[0023] Obtain uniaxial / multiaxial creep rupture performance data of the components to be tested through experiments;

[0024] The multiaxial creep rupture performance parameters are obtained by fitting the uniaxial / multiaxial creep rupture performance data using the least squares method;

[0025] The Cane representative stress of the component to be inspected is determined according to the multiaxial creep rupture performance parameter.

[0026] Preferably, the determining of the conversion model based on the bone point stress concept specifically includes:

[0027] The conversion model is determined based on the ratio of Sdoybrev-Hayhurst-Leckie representative stress, Cane representative stress and bone point stress.

[0028] Preferably, the conversion model is:

[0029]

[0030] Where A = σ I / σ eq , σ I / σ eq is the bone point stress ratio, σ eq is the vonMises equivalent stress, σ I is the principal stress, α is the rupture parameter of the Sdoybrev-Hayhurst-Leckie representative stress, γ / m is the rupture parameter of the Cane representative stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0031] Preferably, the determining of the conversion model based on the bone point stress concept specifically includes:

[0032] When determining the stress ratios at different bone points, the correspondence between the Sdoybrev-Hayhurst-Leckie representative stress and the Cane representative stress;

[0033] The conversion model is determined according to the corresponding relationship.

[0034] Preferably, the conversion model is:

[0035] α=1.43*(1.7 γ / m -1)

[0036] Among them, α is the Sdoybrev-Hayhurst-Leckie fracture parameter representing stress, γ / m is the Cane fracture parameter representing stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0037] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0038] The present invention provides a fracture life determination method based on the bone point stress concept. The bone point stress concept is used to associate the Sdoybrev-Hayhurst-Leckie fracture criterion representing stress with the Cane fracture criterion representing stress to obtain a conversion model. The creep fracture life is predicted based on the conversion model. This method can lay a theoretical foundation for the mutual conversion of the two multiaxial creep fracture criteria, thereby avoiding the prediction error of the multiaxial creep fracture life caused by linear conversion, thereby achieving the purpose of improving the prediction accuracy of the multiaxial creep fracture life. In addition, when predicting the multiaxial creep fracture life, the Sdoybrev-Hayhurst-Leckie fracture criterion representing stress and the Cane fracture criterion representing stress can be used to predict the multiaxial creep life of the component to be tested, thereby obtaining two creep fracture life prediction values. Then, from the perspective of conservatism in structural integrity evaluation, the smaller of the two prediction values is selected for the structural integrity evaluation of the component to be tested.

[0039] Corresponding to the above-mentioned method for determining fracture life based on the bone point stress concept, the present invention further provides a fracture life determination system based on the bone point stress concept, the system comprising:

[0040] A conversion model determination module, used for determining a conversion model based on a bone point stress concept;

[0041] Representative stress acquisition module, used to obtain Cane representative stress of the component to be tested;

[0042] a representative stress determination module, configured to obtain a Sdoybrev-Hayhurst-Leckie representative stress of the component to be inspected based on the conversion model using the Cane representative stress of the component to be inspected;

[0043] The life detection module is used to determine the creep rupture life of the component to be detected based on the Sdoybrev-Hayhurst-Leckie representative stress of the component to be detected.

[0044] Preferably, the representative stress acquisition module includes:

[0045] A data acquisition unit, used for obtaining uniaxial / multiaxial creep rupture performance data of the component to be tested through experiments;

[0046] A fitting unit, configured to fit the uniaxial / multiaxial creep rupture performance data using a least squares method to obtain multiaxial creep rupture performance parameters;

[0047] The representative stress determining unit is used to determine the Cane representative stress of the component to be tested according to the multi-axial creep rupture performance parameter.

[0048] Preferably, the conversion model determination module includes:

[0049] The first conversion model determination unit is used to determine the conversion model according to the Sdoybrev-Hayhurst-Leckie representative stress, the Cane representative stress and the bone point stress ratio; the conversion model is:

[0050]

[0051] Where A = σ I / σ eq , σ I / σ eq is the bone point stress ratio, σ eq is the von Mises equivalent stress, σ I is the principal stress, α is the rupture parameter of the Sdoybrev-Hayhurst-Leckie representative stress, γ / m is the rupture parameter of the Cane representative stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0052] Preferably, the conversion model determination module includes:

[0053] a corresponding relationship determination unit, used for determining the corresponding relationship between the Sdoybrev-Hayhurst-Leckie representative stress and the Cane representative stress when determining the stress ratios of different bone points;

[0054] The second conversion model determination unit is configured to determine the conversion model according to the corresponding relationship; the conversion model is:

[0055] α=1.43*(1.7 γ / m -1)

[0056] Among them, α is the Sdoybrev-Hayhurst-Leckie fracture parameter representing stress, γ / m is the Cane fracture parameter representing stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0057] Since the technical effect achieved by the fracture life determination system based on the bone point stress concept provided by the present invention is the same as the technical effect achieved by the fracture life determination method based on the bone point stress concept provided above, it will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0059] Figure 1 A flow chart of the fracture life determination method based on the bone point stress concept provided by the present invention;

[0060] Figure 2 A flow chart for converting the multiaxial creep rupture performance parameter α value and γ / m value provided in an embodiment of the present invention;

[0061] Figure 3 A graph showing uniaxial creep test data provided by an embodiment of the present invention;

[0062] Figure 4 A schematic diagram of the geometric dimensions of a circumferential notch tensile specimen determined by a multiaxial creep test according to an embodiment of the present invention;

[0063] Figure 5 A schematic diagram of determining the γ value of Cane representative stress provided by an embodiment of the present invention;

[0064] Figure 6 A corresponding relationship diagram of γ / m value and α value under different σI / σeq ratios provided in an embodiment of the present invention;

[0065] Figure 7 A graph comparing two multiaxial creep rupture criteria with formulas (6) and (7) for the same material under the same temperature and test conditions provided in an embodiment of the present invention;

[0066] Figure 8 This is a structural diagram of the fracture life determination system based on the bone point stress concept provided by the present invention. DETAILED DESCRIPTION

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0068] The purpose of the present invention is to provide a method and system for determining the fracture life based on the bone point stress concept. In the mutual conversion formula of two commonly used multiaxial creep fracture criteria based on the bone point stress concept, the two fracture criteria are associated with the bone point stress concept, laying a theoretical foundation for the mutual conversion of the two multiaxial creep fracture criteria, avoiding the prediction error of the multiaxial creep fracture life caused by linear conversion, and thus improving the prediction accuracy of the multiaxial creep fracture life. In addition, when predicting the multiaxial creep fracture life, the Sdoybrev-Hayhurst-Leckie fracture criterion representing stress and the Cane fracture criterion representing stress can be used to predict the multiaxial creep life of the component to be tested, so that two creep fracture life prediction values can be obtained; then, from the perspective of conservatism in structural integrity evaluation, the smaller of the two prediction values is selected for the structural integrity evaluation of the component to be tested.

[0069] Related terms:

[0070] Creep fracture refers to the process in which microvoids on grain boundaries initiate, grow, and coalesce to form macroscopic cracks. The macroscopic cracks then begin to propagate. Defective components serving at high temperatures eventually fail due to a sharp reduction in bearing area, resulting in unstable crack propagation.

[0071] Uniaxial stress refers to the stress when a unit inside a solid material (such as a hexahedral unit in an orthogonal coordinate system) is subjected to an external load in a single direction, and the strength of the external load on the unit can be used as stress. The unit is Pa (N / m2), and the commonly used unit is MPa.

[0072] Multi-axial stress, as opposed to uniaxial stress, refers to the situation where a unit cell within a solid material (such as a hexahedral unit in an orthogonal coordinate system) is simultaneously subjected to loads in multiple directions. The intensity of each load on the unit can be expressed as stress (i.e., load per unit area). The stress state of a material unit is represented by a stress tensor.

[0073] A skeletal point is a point within a structure where the stress state remains essentially unchanged with creep time under creep conditions. This point can be used to characterize the creep rupture properties of a material. The stress at this point is called the skeletal stress.

[0074] Representative stress refers to the stress at which the fracture life of a specimen under multiaxial stress equals the fracture life of a uniaxial specimen under the same stress level. It is the dominant parameter determining the creep life of materials under multiaxial stress. It is a combined stress, typically expressed as a linear or multiplicative combination of the maximum principal stress and the von Mises equivalent stress. The two commonly used representative stresses in current research are the Sdoybrev-Hayhurst-Leckie representative stress and the Cane representative stress. The former is a linear combination stress proposed by Soviet researchers Sdoybrev and Hayhurst-Leckie, respectively; the latter is a multiplicative combination stress proposed by Cane.

[0075] The multiaxial creep rupture parameter, typically represented by the Greek letter α for the Sdoybrev-Hayhurst-Leckie stress-based rupture parameter, is defined as 0 ≤ α ≤ 1. For the Cane stress-based rupture parameter, it is typically represented by the ratio γ / m, where γ is obtained from multiaxial stress testing and m is obtained from uniaxial creep testing, and 0 ≤ γ / m ≤ 1. The multiaxial creep rupture parameter determines the magnitude of the representative stress and reflects the relative importance of the multiaxial stress components (i.e., the maximum principal stress or equivalent stress) on the creep rupture life of a material.

[0076] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0077] like Figure 1 As shown, the fracture life determination method based on the bone point stress concept provided by the present invention includes:

[0078] Step 100: Determine a transformation model based on the bone point stress concept.

[0079] Step 101: Obtain the Cane representative stress of the component to be tested. The specific process of this step can be

[0080] The uniaxial / multiaxial creep rupture performance data of the components to be tested are obtained through experiments.

[0081] The least squares method was used to fit the uniaxial / multiaxial creep-rupture performance data to obtain the multiaxial creep-rupture performance parameters.

[0082] The Cane representative stress of the component to be tested is determined based on the multiaxial creep rupture performance parameters.

[0083] Step 102: Using the Cane representative stress of the component to be inspected, obtain the Sdoybrev-Hayhurst-Leckie representative stress of the component to be inspected based on the conversion model.

[0084] Step 103: Determine the creep rupture life of the component to be tested based on the Sdoybrev-Hayhurst-Leckie representative stress of the component to be tested.

[0085] In which case, if the size of the component to be tested is clearly known (i.e., the location of the bone point or hot spot of the component to be tested is clearly obtained), the implementation process of the above step 100 can be: based on the concept of bone point stress, the two representative stresses of Sdoybrev-Hayhurst-Leckie and Cane can be made equal, that is, formula (3) and formula (4) are made equal, and then both sides of the equation are divided by the vonMises equivalent stress σ eq , we get the conversion formula (i.e. conversion model) from γ / m value to α value:

[0086]

[0087] Where A = σ I / σ eq , σ I / σ eq is the bone point stress ratio, σ eq is the vonMises equivalent stress, σ I is the principal stress, α is the rupture parameter of the Sdoybrev-Hayhurst-Leckie representative stress, γ / m is the rupture parameter of the Cane representative stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0088] In addition, if Figure 6 As shown, when the specific size of the component to be tested is unknown (i.e., the value of A is different), the Figure 6 The conversion curve at the middle position (shown by the dotted line) is more appropriate than the linear conversion. The specific expression of the curve is:

[0089] α=1.43*(1.7 γ / m -1)

[0090] Among them, α is the Sdoybrev-Hayhurst-Leckie fracture parameter representing stress, γ / m is the Cane fracture parameter representing stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0091] The specific implementation process of the above-mentioned method for determining the fracture life based on the bone point stress concept is described below with a specific embodiment.

[0092] like Figure 2 As shown, in the specific implementation process, first, a uniaxial creep rupture test is carried out, and at the same time, a multiaxial creep rupture test is carried out based on the test implementation specification of the multiaxial creep test. Then, the value of the parameter γ / m in the Cane representative stress is determined, and then the value of the rupture parameter α in the Sdoybrev-Hayhurst-Leckie representative stress is finally determined through the conversion model. The following uses the conversion of the γ / m value to the α value as an example to verify the effectiveness of the present invention. Since there is a clear relationship between the two, it is easy to derive the formula for converting the α value to the γ / m value, which will not be repeated here.

[0093] The purpose of the uniaxial creep test is to determine the relationship between stress and rupture life (i.e., formula (1)) curve, as follows Figure 3 As shown, the specific values of M and m in formula (1) are obtained by least square fitting.

[0094] The specimen used in the multiaxial creep rupture test is the specimen type specified in the existing circumferential notch specimen implementation specification. Its main dimensions are as follows: Figure 4 As shown, where p is the applied load in N, D, d no and r no It is divided into the outer diameter of the specimen, the inner diameter of the notch and the notch radius. Specifically, the specification requires D / d no The ratio is 1.414, d no / r no The ratio is between 1 and 50. According to the implementation specifications, there is a bone point on the inner diameter section, and the stress components at this point (including the maximum principal stress and vonMises equivalent stress) are called bone point stress.

[0095] Substitute the Cane representative stress (Formula (4)) into Formula (2), then divide both sides of Formula (2) by both sides of Formula (1), and then take the logarithm of both sides to obtain:

[0096]

[0097] The meanings of all parameters are the same as above.

[0098] According to the obtained single and multi-axis data, the value of γ can be obtained by fitting with the least square method (such as Figure 5 As shown), the γ / m value representing the stress of Cane is finally determined.

[0099] Based on the concept of bone point stress, the two representative stresses of Sdoybrev-Hayhurst-Leckie and Cane can be made equal, that is, equations 3 and 4 can be made equal. Then, by dividing both sides of the equation by the von Mises equivalent stress σeq, the conversion formula from γ / m value to α value is obtained:

[0100]

[0101] Where A is σ I / σ eq The ratio of the circumferential notch specimens of any geometry specified in the implementation specification (such as Figure 6 The values of A are given.

[0102] According to the bone point stress σ given in the multiaxial creep circumferential notch specimen implementation specification I / σ eq Ratio (corresponding to different annular gap sizes, such as Figure 6 As shown), different σ I / σ eq The corresponding relationship between γ / m value and α value under the ratio is as follows: Figure 7 As shown. Figure 7 It can be seen that different σ I / σ eq When the γ / m value approaches its extreme values (0 or 1), the γ / m value and the α value are nearly equal. However, when the γ / m value approaches 0.5, the maximum difference between the γ / m value and the α value is 0.1. If the two are still considered equal at this time, it may lead to a large deviation in the prediction results. The creep crack growth life of welded joints is very sensitive to changes in the α value. That is, when the α value increases by 0.05 (Δα = 0.05), the creep crack growth life decreases by approximately 47%. Therefore, in order to improve the prediction accuracy of multiaxial fracture, it is necessary to ensure the accuracy of the multiaxial creep fracture criterion conversion formula. Simply assuming that the two fracture criteria are linearly equal is not appropriate in certain circumstances.

[0103] also, Figure 6 As shown in the figure, when the specific circumferential notch specimen size is unknown (i.e., the A value is different), the Figure 6 The conversion curve at the middle position (shown by the dotted line) is more appropriate than the linear conversion. The specific expression of the curve is:

[0104] α=1.43*(1.7 γ / m -1) (7)

[0105] In order to verify the reliability of the conversion formulas proposed by formula (6) and formula (7), the present invention obtains two multiaxial creep rupture criteria measured for the same material at the same temperature and test conditions. The fracture life determination method based on the bone point stress concept provided by the present invention is implemented to obtain the following: Figure 7 The verification results shown in the figure show that the experimental data are in good agreement with the theoretical prediction results, so it is appropriate to use formula (6) or formula (7) to transform the multiaxial creep rupture criterion. Figure 7 The information of materials, multiaxial creep rupture parameters, specimen size, notch sharpness ratio, etc. is shown in Table 1.

[0106] Table 1

[0107]

[0108]

[0109] Corresponding to the above-mentioned method for determining fracture life based on the bone point stress concept, the present invention also provides a fracture life determination system based on the bone point stress concept, such as Figure 8 As shown, the system includes: a conversion model determination module 1, a representative stress acquisition module 2, a representative stress determination module 3 and a life detection module 4.

[0110] The conversion model determination module 1 is used to determine the conversion model based on the bone point stress concept.

[0111] The representative stress acquisition module 2 is used to obtain the Cane representative stress of the component to be tested.

[0112] The representative stress determination module 3 is used to obtain the Sdoybrev-Hayhurst-Leckie representative stress of the component to be detected based on the conversion model using the Cane representative stress of the component to be detected.

[0113] The life detection module 4 is used to determine the creep rupture life of the component to be detected based on the Sdoybrev-Hayhurst-Leckie representative stress of the component to be detected.

[0114] The representative stress acquisition module 2 used above may include: a data acquisition unit, a fitting unit and a representative stress determination unit.

[0115] The data acquisition unit is used to obtain uniaxial / multiaxial creep rupture performance data of the component to be tested through experiments.

[0116] The fitting unit is used to fit the uniaxial / multiaxial creep rupture performance data using the least squares method to obtain the multiaxial creep rupture performance parameters.

[0117] The representative stress determination unit is used to determine the Cane representative stress of the component to be tested according to the multi-axial creep rupture performance parameters.

[0118] The conversion model determination module 1 used above may include: a first conversion model determination unit.

[0119] The first conversion model determination unit is used to determine the conversion model based on the Sdoybrev-Hayhurst-Leckie representative stress, the Cane representative stress and the bone point stress ratio. The conversion model is:

[0120]

[0121] Where A = σ I / σ eq , σ I / σ eq is the bone point stress ratio, σ eq is the von Mises equivalent stress, σ I is the principal stress, α is the rupture parameter of the Sdoybrev-Hayhurst-Leckie representative stress, γ / m is the rupture parameter of the Cane representative stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0122] Furthermore, when the size of the component to be detected cannot be determined, in order to improve detection accuracy, the conversion model determination module 1 provided above may further include: a corresponding relationship determination unit and a second conversion model determination unit.

[0123] The corresponding relationship determination unit is used to determine the corresponding relationship between the Sdoybrev-Hayhurst-Leckie representative stress and the Cane representative stress when the stress ratio of different bone points is determined.

[0124] The first conversion model determination unit is used to determine the conversion model according to the corresponding relationship. The conversion model is:

[0125] α=1.43*(1.7 γ / m -1)

[0126] Among them, α is the Sdoybrev-Hayhurst-Leckie fracture parameter representing stress, γ / m is the Cane fracture parameter representing stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter.

[0127] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0128] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for determining fracture life based on the concept of bone point stress, characterized in that: include: Determine the transformation model based on the bone point stress concept; Obtain the Cane representative stress of the component to be tested; Using the Cane representative stress of the component to be tested, the Sdoybrev-Hayhurst-Leckie representative stress of the component to be tested is obtained based on the conversion model; determining a creep rupture life of the component to be inspected based on the Sdoybrev-Hayhurst-Leckie representative stress of the component to be inspected; Among them, the conversion model is determined based on the bone point stress concept, including: The conversion model is determined based on the ratio of the Sdoybrev-Hayhurst-Leckie representative stress, the Cane representative stress, and the bone point stress; in this case, the conversion model is: Where A = σ I / σ eq , σ I / σ eq is the bone point stress ratio, σ eq is the vonMises equivalent stress, σ I is the principal stress, α is the rupture parameter of the Sdoybrev-Hayhurst-Leckie representative stress, γ / m is the rupture parameter of the Cane representative stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter; Alternatively, a transformation model is determined based on the bone point stress concept, including: When determining the stress ratios at different bone points, the correspondence between the Sdoybrev-Hayhurst-Leckie representative stress and the Cane representative stress; The conversion model is determined according to the corresponding relationship; in this case, the conversion model is: α＝1.43*(1.7 γ / m -1)。 2. The fracture life determination method based on the bone point stress concept according to claim 1 is characterized in that: Obtain the Cane representative stress of the component to be tested, including: Obtain uniaxial / multiaxial creep rupture performance data of the components to be tested through experiments; The multiaxial creep rupture performance parameters are obtained by fitting the uniaxial / multiaxial creep rupture performance data using the least squares method; The Cane representative stress of the component to be inspected is determined according to the multiaxial creep rupture performance parameter.

3. A fracture life determination system based on the bone point stress concept, characterized in that: include: A conversion model determination module, used for determining a conversion model based on a bone point stress concept; Representative stress acquisition module, used to obtain Cane representative stress of the component to be tested; a representative stress determination module, configured to obtain a Sdoybrev-Hayhurst-Leckie representative stress of the component to be inspected based on the conversion model using the Cane representative stress of the component to be inspected; a life detection module, configured to determine the creep rupture life of the component to be detected based on the Sdoybrev-Hayhurst-Leckie representative stress of the component to be detected; Wherein, the conversion model determination module includes: The first conversion model determination unit is used to determine the conversion model according to the Sdoybrev-Hayhurst-Leckie representative stress, the Cane representative stress and the bone point stress ratio; the conversion model is: Where A = σ I / σ eq , σ I / σ eq is the bone point stress ratio, σ eq is the vonMises equivalent stress, σ I is the principal stress, α is the rupture parameter of the Sdoybrev-Hayhurst-Leckie representative stress, γ / m is the rupture parameter of the Cane representative stress, m is the stress exponent, and γ is the multiaxial creep rupture performance parameter; Alternatively, the conversion model determination module includes: a corresponding relationship determination unit, used for determining the corresponding relationship between the Sdoybrev-Hayhurst-Leckie representative stress and the Cane representative stress when determining the stress ratios of different bone points; The second conversion model determination unit is configured to determine the conversion model according to the corresponding relationship; the conversion model is: α＝1.43*(1.7 γ / m -1)。 4. The fracture life determination system based on the bone point stress concept according to claim 3 is characterized in that: The representative stress acquisition module includes: A data acquisition unit, used for obtaining uniaxial / multiaxial creep rupture performance data of the component to be tested through experiments; A fitting unit, configured to fit the uniaxial / multiaxial creep rupture performance data using a least squares method to obtain multiaxial creep rupture performance parameters; The representative stress determining unit is used to determine the Cane representative stress of the component to be tested according to the multi-axial creep rupture performance parameter.

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