Method for predicting damage of pore defects to mechanical and thermal properties of high-temperature alloy
By slicing and sampling high-temperature alloys and observing them with scanning electron microscopy, a single-cell model was established and boundary conditions were applied. This solved the problem of rapid and effective prediction of the mechanical and thermal property damage caused by pore defects in high-temperature alloys, and provided an accurate assessment of thermal conductivity and mechanical properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA ACAD OF AEROSPACE AERODYNAMICS
- Filing Date
- 2025-12-29
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, the degree of damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects cannot be predicted quickly and effectively.
By slicing and sampling high-temperature alloys, observing the microstructure using a scanning electron microscope, marking pore defects, establishing a unit cell model and meshing, applying temperature and mechanical boundary conditions, and calculating the equivalent thermal conductivity and mechanical properties.
It enables rapid and effective prediction of the damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects, and provides accurate assessment of equivalent thermal conductivity and mechanical properties.
Smart Images
Figure CN122016919A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of aircraft thermal protection technology, and in particular to a method, system, and computer program product for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys. Background Technology
[0002] High-temperature alloys, with their high strength, excellent high-temperature performance, and corrosion resistance, have been widely used in the aerospace field in recent years. The United States has combined Ti2AlNb high-temperature alloy with cast γ-TiAl high-temperature alloy impellers to create bimetallic centrifugal impellers, and has also used Ti2AlNb high-temperature alloy to manufacture the rotor of the rear stage compressor for aero-engines, achieving weight reduction while meeting mechanical performance requirements. Ti2AlNb high-temperature alloys can be used for extended periods in the temperature range of 873~1023K, which is of great significance for reducing aircraft weight, improving fuel efficiency, and enhancing high-temperature service performance.
[0003] Most components made from high-temperature alloys are hot-formed parts. However, high-temperature alloys have high resistance to hot deformation and exhibit microstructural sensitivity during the initial forging of ingots and the secondary forging or rolling of billets such as bars, plates, and rings. It is difficult to guarantee the uniformity of the microstructure, and defects such as porosity may exist in the microstructure of the formed parts, reducing the material's mechanical stiffness and thermal transfer properties. Therefore, predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys is of great significance. Summary of the Invention
[0004] The purpose of this disclosure is to provide a method, system, and computer program product for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys, so as to solve the problems existing in the prior art.
[0005] The embodiments of this disclosure adopt the following technical solution: a method for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys, comprising: taking slices of the high-temperature alloy to be tested, observing the microstructure of the slices using a scanning electron microscope to obtain SEM images of the microstructure of the high-temperature alloy to be tested; marking the porosity defects in the SEM images, statistically analyzing the size and morphological distribution of the porosity defects, and calculating the porosity of the high-temperature alloy to be tested; establishing a unit cell model of the microstructure of the high-temperature alloy to be tested that is geometrically similar to the SEM images at the porosity, and meshing the unit cell model; applying temperature boundary conditions to the meshed unit cell model and solving for the equivalent thermal conductivity of the high-temperature alloy corresponding to different porosities; applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities, wherein the mechanical properties include at least: equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity.
[0006] This disclosure also provides a system for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys, comprising: a microstructure acquisition module for slicing and sampling the high-temperature alloy under test, observing the microstructure of the slice using a scanning electron microscope, and obtaining a SEM image of the microstructure of the high-temperature alloy under test; a porosity acquisition module for marking the porosity defects in the SEM image, statistically analyzing the size and morphological distribution of the porosity defects, and calculating the porosity of the high-temperature alloy under test; a model processing module for establishing a unit cell model of the microstructure of the high-temperature alloy under test that is geometrically similar to the SEM image at the porosity, and meshing the unit cell model; an equivalent thermal conductivity calculation module for applying temperature boundary conditions to the meshed unit cell model and solving for the equivalent thermal conductivity of the high-temperature alloy corresponding to different porosities; and a mechanical property calculation module for applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities, wherein the mechanical properties include at least: equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity.
[0007] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method for predicting the damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects.
[0008] The beneficial effects of this disclosure are as follows: the fine structure of the alloy is observed by scanning electron microscopy; the pore distribution, size parameters, and porosity are statistically obtained from SEM images; a unit cell model of the fine structure is established based on the SEM images and porosity; temperature boundary conditions are applied to the established unit cell model to obtain the equivalent thermal conductivity of the alloy; mechanical boundary conditions are applied to the established unit cell model to obtain the equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity of the alloy; this solves the problem in the prior art that the degree of damage to the mechanical and thermal properties of high-temperature alloys by pore defects cannot be quickly and effectively predicted. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in one or more embodiments of this specification or in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0010] Figure 1 This is a flowchart of the method for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys in the first embodiment of this disclosure; Figure 2This is a schematic diagram of the microstructure of the high-temperature alloy under test in the first embodiment of this disclosure using SEM images. Figure 3 This is a schematic diagram of a single-cell model in the first embodiment of this disclosure; Figure 4 This is a schematic diagram of the temperature boundary conditions in the first embodiment of this disclosure; Figure 5 This is a schematic diagram showing the relationship between the thermal conductivity of the high-temperature alloy and porosity in the first embodiment of this disclosure; Figure 6 This is a schematic diagram of the mechanical boundary conditions in the first embodiment of this disclosure; Figure 7 This is a schematic diagram showing the relationship between the equivalent elastic modulus and porosity in the first embodiment of this disclosure; Figure 8 This is a schematic diagram illustrating the variation of shear modulus with porosity in the first embodiment of this disclosure; Figure 9 This is a schematic diagram illustrating the relationship between Poisson's ratio and porosity in the first embodiment of this disclosure; Figure 10 This is a schematic diagram illustrating the relationship between yield strength and porosity in the first embodiment of this disclosure; Figure 11 This is a schematic diagram showing the variation of the minimum residual strength coefficient with porosity in the first embodiment of this disclosure; Figure 12 This is a schematic diagram of the structure of the system for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys in the first embodiment of this disclosure. Detailed Implementation
[0011] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this document.
[0012] To address the problems existing in the prior art, the first embodiment of this disclosure provides a method for predicting the damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects, the flowchart of which is shown below. Figure 1 As shown, it mainly includes steps S10 to S50: S10: The high-temperature alloy to be tested is sliced and sampled. The microstructure of the slice is observed using a scanning electron microscope to obtain SEM images of the microstructure of the high-temperature alloy to be tested.
[0013] In this embodiment, the high-temperature alloy to be tested is Ti2AlNb high-temperature alloy as an example. The SEM images of its microstructure are shown below. Figure 2 As shown.
[0014] S20: Mark the pore defects in the SEM images, count the size and morphological distribution of the pore defects, and calculate the porosity of the high-temperature alloy under test.
[0015] Based on the obtained SEM images, different features in the microstructure of the high-temperature alloy are classified and distinguished, pore defects are marked, and the distribution characteristics, size distribution, and shape of pores are statistically analyzed. The volume fraction occupied by pores is then calculated, which is the porosity of the high-temperature alloy. In this embodiment, the porosity is set to be... Its shape is approximately spherical, and its diameter is distributed as follows: .
[0016] S30. A unit cell model of the microstructure of the high-temperature alloy under test with geometric similarity to the SEM image under porosity was established, and the unit cell model was meshed.
[0017] Based on the finite element method, a unit cell model is established under the corresponding porosity. The unit cell model is a cube, and its size should be large enough to contain enough microstructural features. The side length of the unit cell model should be more than 20 times the average diameter of the pores. The geometric similarity between the unit cell model and the SEM image mainly considers the following features: the spatial distribution pattern of pores, the shape of pores, the size distribution pattern of pores, and the porosity. Figure 3 (a) shows a two-dimensional model established based on the finite element method. Figure 3 (b) shows the corresponding three-dimensional model.
[0018] The unit cell model is then meshed. In this embodiment, the mesh size is equal to 1 / 10 to 1 / 20 of the pore diameter, which facilitates the simulation and analysis of the effect of pores on the mechanical and thermal properties of the model.
[0019] S40 applies temperature boundary conditions to the meshed unit cell model and solves for the equivalent thermal conductivity of high-temperature alloys with different porosities.
[0020] Establishing a three-dimensional coordinate system facilitates the description of each surface of the unit cell model and the analysis of its stress conditions. The x-axis and z-axis form a plane parallel to the upper and lower surfaces of the unit cell model, while the y-axis is perpendicular to this plane and represents the height direction of the unit cell model.
[0021] When predicting the equivalent thermal conductivity, periodic boundary conditions are applied to the side of the unit cell model parallel to the heat flow: , To maintain a balance between heat input and output, apply temperature difference boundary conditions to the upper and lower surfaces of the unit cell model, i.e., the surfaces perpendicular to the heat flow direction: The heat transfer process was simulated; among them, Let be the side length of the unit cell model. Representing temperature, temperature boundary conditions are applied as follows: Figure 4 As shown.
[0022] According to Fourier's Law:
[0023] in, For heat flux density, Thermal conductivity, Representing the temperature gradient, in a three-dimensional model, we have:
[0024]
[0025] The equivalent thermal conductivity is obtained through derivation:
[0026] in, To calculate the heat flux at the directional heat flux output surface, it is obtained by summing the output heat fluxes of all corresponding nodes. The change in temperature Figure 5 The relationship between equivalent thermal conductivity and porosity is shown.
[0027] S50 applies mechanical boundary conditions to the meshed unit cell model and solves the problem to obtain the mechanical properties of high-temperature alloys with different porosities.
[0028] The mechanical properties in this embodiment mainly include: equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity. It should be noted that since air within the pores does not transmit mechanical loads, its stiffness effect is ignored in the prediction process.
[0029] like Figure 6 As shown, to ensure the continuity of stress and displacement at the boundary of the unit cell, corresponding nodes on each surface of the unit cell are coupled to establish periodic displacement boundary conditions on the unit cell surface. Three-directional loading coupling equations:
[0030]
[0031]
[0032] in, , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. for The displacement component in the direction; then fix 1 point, for example, set The basic loading mode of the unit cell model is determined by the following matrix:
[0033] In matrix P, the main diagonal elements control the tensile and compressive deformation of the unit cell, while other elements control the shear deformation of the unit cell. By combining the value constraints of elements at different positions in the matrix, the analysis and calculation of different mechanical properties can be achieved.
[0034] Specifically, when the mechanical property to be determined is the equivalent elastic modulus, in the matrix... In the settings , and If no value is specified and all other elements are set to zero, then the elastic modulus is calculated considering the Poisson effect under y-direction tension, and the expression for the elastic modulus is:
[0035] in, The normal force along the y-direction section is extracted from the calculation results of the unit cell model. For cross-sectional area, Let be the side length of the unit cell model. This is axial deformation.
[0036] When the mechanical property to be determined is the shear modulus, in the matrix In the settings If all other elements are set to zero, then we consider shear deformation parallel to the xy plane, and the expression for the shear modulus is:
[0037] in, Shear force, derived from the unit cell model In the direction of shear force application, the nodes on the surface of action are extracted. The cross-sectional area of the force is... This is the original length corresponding to the shear deformation edge. for To the amount of shear deformation.
[0038] When the mechanical property to be determined is Poisson's ratio, in the matrix In the settings , and If no value is specified and all other elements are set to zero, then the y-axis stretching is considered, taking into account the Poisson effect. The Poisson ratio expression is:
[0039] in, , indicating lateral strain. This represents the change in lateral dimension. This is the original horizontal side length. , For axial strain, denoted as the axial side length.
[0040] When the mechanical property to be determined is the yield strength, in the matrix In the settings , and Without setting any other elements, and considering the Poisson effect for y-axis compression, we can... The load is applied gradually in n steps, and the stress and strain are calculated for each load step. In post-processing, the residual strain under each load step is calculated.
[0041] in, For total strain, The force is in the y-direction. Let y be the cross-sectional area. The elastic modulus of the high-temperature alloy to be tested is determined; finally, by iterating through each load step, the point where the residual strain is 0.2% is determined as the yield strength point of the high-temperature alloy to be tested, and based on the formula... Calculate the yield strength, where, For yield strength, The load value under the corresponding load step. This represents the original cross-sectional area of the surface subjected to force.
[0042] When the mechanical property to be determined is the load-bearing capacity, in the matrix In the settings , and Without setting any other elements, considering the Poisson effect in y-direction compression, the maximum stress inside the unit cell model is extracted from the calculation results. The residual strength coefficient is equal to the material's yield strength divided by the actual stress experienced by the material. A residual strength coefficient less than 1 indicates that the stress at that point exceeds the yield strength, and plastic deformation occurs in the structure at that point. Therefore, the minimum residual strength coefficient is obtained by dividing the high-temperature alloy's yield strength by the maximum stress inside the unit cell. By changing... Continue until a point is found where the residual strength coefficient is less than 1, and then determine the current... This represents the maximum safe deformation that the high-temperature alloy under test can withstand, i.e., its load-bearing capacity.
[0043] Figures 7 to 11 The figures show the relationship between the equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and minimum residual strength coefficient of the Ti2AlNb high-temperature alloy in this embodiment and the porosity.
[0044] This embodiment uses scanning electron microscopy to observe the microstructure of the alloy; it uses SEM images to statistically determine the pore distribution, size parameters, and porosity; based on the SEM images and porosity, a microstructure unit cell model is established; for the established unit cell model, temperature boundary conditions are applied to obtain the alloy's equivalent thermal conductivity; for the established unit cell model, mechanical boundary conditions are applied to obtain the alloy's equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity; this solves the problem in the prior art that the degree of damage to the mechanical and thermal properties of high-temperature alloys by pore defects cannot be quickly and effectively predicted.
[0045] Based on the same inventive concept, the second embodiment of this disclosure provides a system for predicting the damage of porosity defects to the mechanical and thermal properties of high-temperature alloys, the structural schematic diagram of which is shown below. Figure 12 As shown, the system includes: a microstructure acquisition module 10, used to slice and sample the high-temperature alloy under test, observe the microstructure of the cross-section using a scanning electron microscope, and obtain SEM images of the microstructure of the high-temperature alloy under test; a porosity acquisition module 20, used to mark pore defects in the SEM images, statistically analyze the size and morphological distribution of pore defects, and calculate the porosity of the high-temperature alloy under test; a model processing module 30, used to establish a unit cell model of the microstructure of the high-temperature alloy under test with geometric similarity to the SEM images under different porosities, and to mesh the unit cell model; an equivalent thermal conductivity calculation module 40, used to apply temperature boundary conditions to the meshed unit cell model and solve for the equivalent thermal conductivity of the high-temperature alloy corresponding to different porosities; and a mechanical property calculation module 50, used to apply mechanical boundary conditions to the meshed unit cell model and solve for the mechanical properties of the high-temperature alloy corresponding to different porosities, the mechanical properties including at least: equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity.
[0046] It should be understood that the specific functions implemented by the above modules have been described in detail in the first embodiment of this disclosure, and will not be repeated here.
[0047] This embodiment uses scanning electron microscopy to observe the microstructure of the alloy; it uses SEM images to statistically determine the pore distribution, size parameters, and porosity; based on the SEM images and porosity, a microstructure unit cell model is established; for the established unit cell model, temperature boundary conditions are applied to obtain the alloy's equivalent thermal conductivity; for the established unit cell model, mechanical boundary conditions are applied to obtain the alloy's equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity; this solves the problem in the prior art that the degree of damage to the mechanical and thermal properties of high-temperature alloys by pore defects cannot be quickly and effectively predicted.
[0048] Based on the same inventive concept, the third embodiment of this disclosure provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the method provided in the first embodiment of this disclosure.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.
Claims
1. A method for predicting the damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects, characterized in that, include: The high-temperature alloy under test was sliced and sampled. The microstructure of the sliced surface was observed using a scanning electron microscope, and SEM images of the microstructure of the high-temperature alloy under test were obtained. The pore defects in the SEM images are marked, the size and morphological distribution of the pore defects are statistically analyzed, and the porosity of the high-temperature alloy under test is calculated. A unit cell model of the microstructure of the high-temperature alloy under test, which is geometrically similar to the SEM image at the specified porosity, is established, and the unit cell model is meshed. Temperature boundary conditions are applied to the meshed unit cell model, and the equivalent thermal conductivity of the high-temperature alloy corresponding to different porosities is obtained by solving the problem. Mechanical boundary conditions are applied to the meshed unit cell model, and the mechanical properties of high-temperature alloys with different porosities are obtained by solving the problem. The mechanical properties include at least: equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity.
2. The prediction method according to claim 1, characterized in that, The mesh size of the unit cell model is equal to 1 / 10 to 1 / 20 of the pore diameter.
3. The prediction method according to claim 1, characterized in that, The process of applying temperature boundary conditions to the meshed unit cell model and solving for the equivalent thermal conductivity of the high-temperature alloy corresponding to different porosities includes: Periodic boundary conditions are applied to the side of the unit cell model parallel to the heat flow: , To maintain a balance between heat input and output, among which, Let be the side length of the unit cell model. Indicates temperature; Apply a temperature difference boundary condition to the surface perpendicular to the heat flow in the unit cell model: To simulate the heat transfer process; Based on Fourier's law expressed in a three-dimensional model, the equivalent thermal conductivity is derived. : in, To solve for the heat flow rate at the directional heat flow output surface, This represents the change in temperature.
4. The prediction method according to claim 1, characterized in that, When the mechanical property is the equivalent elastic modulus, the step of applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities includes: On the surface of the unit cell model, along The coupling equations for loading in three directions are as follows: in, , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. for Displacement components in the direction; set up The basic loading mode of the unit cell model is determined by the following matrix: In the matrix In the settings , and If no value is specified and all other elements are set to zero, then the elastic modulus is calculated considering the Poisson effect in the y-direction tension, and the expression for the elastic modulus is: in, The normal force along the y-direction section is extracted from the calculation results of the unit cell model. For the cross-sectional area, Let be the side length of the unit cell model. This is axial deformation.
5. The prediction method according to claim 1, characterized in that, When the mechanical property is shear modulus, the process of applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities includes: On the surface of the unit cell model, along The coupling equations for loading in three directions are as follows: in, , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. for Displacement components in the direction; set up The basic loading mode of the unit cell model is determined by the following matrix: In the matrix In the settings If all other elements are set to zero, then we consider shear deformation parallel to the xy plane, and the expression for the shear modulus is: in, Shear force, derived from the unit cell model In the direction of shear force application, the nodes on the surface of action are extracted. The cross-sectional area of the force is... This is the original length corresponding to the shear deformation edge. for To the amount of shear deformation.
6. The prediction method according to claim 1, characterized in that, When the mechanical property is Poisson's ratio, the process of applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities includes: On the surface of the unit cell model, along The coupling equations for loading in three directions are as follows: in, , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. for Displacement components in the direction; set up The basic loading mode of the unit cell model is determined by the following matrix: In the matrix In the settings , and If no value is specified and all other elements are set to zero, then the y-axis stretching is considered, taking into account the Poisson effect. The Poisson ratio expression is: in, , indicating lateral strain. This represents the change in lateral dimension. This is the original horizontal side length. , For axial strain, denoted as the axial side length.
7. The prediction method according to claim 1, characterized in that, When the mechanical property is the yield strength, the step of applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities includes: On the surface of the unit cell model, along The coupling equations for loading in three directions are as follows: in, , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. for Displacement components in the direction; set up The basic loading mode of the unit cell model is determined by the following matrix: In the matrix In the settings , and If no value is specified and all other elements are set to zero, then the y-axis compression is considered, taking into account the Poisson effect. The load is applied gradually in n steps, and the stress and strain calculation results are calculated for each load step. In post-processing, the residual strain under each load step is calculated. ,in, For total strain, The force is in the y-direction. Let y be the cross-sectional area. The elastic modulus of the high-temperature alloy to be tested; By iterating through each load step, the point where the residual strain is 0.2% is determined as the yield strength point of the high-temperature alloy under test, and based on the formula... Calculate the yield strength, where, For yield strength, The load value under the corresponding load step. This represents the original cross-sectional area of the surface subjected to force.
8. The prediction method according to claim 7, characterized in that, When the mechanical property is load-bearing capacity, the process of applying mechanical boundary conditions to the meshed unit cell model and solving for the mechanical properties of the high-temperature alloy corresponding to different porosities includes: On the surface of the unit cell model, along The coupling equations for loading in three directions are as follows: in, , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. , for The direction corresponds to the point on the plane. for Displacement components in the direction; set up The basic loading mode of the unit cell model is determined by the following matrix: In the matrix In the settings , and Without setting any parameters and setting all other elements to zero, considering the Poisson effect in y-direction compression, the maximum stress inside the unit cell model is extracted from the calculation results. The residual strength coefficient is determined by dividing the yield strength by the maximum stress. This is achieved by changing... Continue until a point is found where the residual strength coefficient is less than 1, and then determine the current... The load-bearing capacity of the high-temperature alloy under test.
9. A system for predicting the damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects, characterized in that, include: The microstructure acquisition module is used to slice and sample the high-temperature alloy under test, observe the microstructure of the slice using a scanning electron microscope, and obtain SEM images of the microstructure of the high-temperature alloy under test. The porosity acquisition module is used to mark the pore defects in the SEM image, count the size and morphological distribution of the pore defects, and calculate the porosity of the high-temperature alloy under test. The model processing module is used to establish a unit cell model of the microstructure of the high-temperature alloy under test that is geometrically similar to the SEM image at the porosity, and to perform mesh generation on the unit cell model. The equivalent thermal conductivity calculation module is used to apply temperature boundary conditions to the meshed unit cell model and solve for the equivalent thermal conductivity of high-temperature alloys with different porosities. The mechanical property calculation module is used to apply mechanical boundary conditions to the meshed unit cell model and solve for the mechanical properties of high-temperature alloys with different porosities. The mechanical properties include at least: equivalent elastic modulus, shear modulus, Poisson's ratio, yield strength, and load-bearing capacity.
10. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the method for predicting the damage to the mechanical and thermal properties of high-temperature alloys caused by porosity defects as described in any one of claims 1 to 8.