A coating-single crystal interface stress and strain measurement method, device and equipment

Abstract

The present invention relates to the field of interface stress calculation, and in particular discloses a coating-single crystal interface stress-strain measurement method, device, equipment and computer-readable storage medium, by receiving simulation independent variables, the simulation independent variables include integral point coordinates, temperature and heat exposure time; according to the simulation independent variables, the target mechanical / physical performance parameters are determined by preset mechanical / physical performance parameter-space coordinate function; the target mechanical / physical performance parameters are input into the finite element model of the tested coated single crystal alloy, so that the finite element model outputs corresponding stress-strain field data according to the mechanical / physical performance parameters of the target material and preset boundary conditions; wherein the finite element model includes a substrate area, a diffusion area and a coating area in sequence along the thickness direction. The present invention realizes the continuous transition of physical properties near the interface, which is closer to the actual situation, and also greatly improves the calculation accuracy of the stress-strain field.

Description

Technical Field

[0001] The present invention relates to the field of interface stress calculation, and in particular to a coating-single crystal interface stress and strain measurement method, device, equipment and computer-readable storage medium. Background Art

[0002] To meet the high efficiency and thrust-to-weight ratio requirements of modern aircraft engines, antioxidant coating materials are widely used. While the use of these coatings reduces the material's operating temperature and improves its oxidation and corrosion resistance, they also alter the substrate's microstructure and mechanical properties.

[0003] Numerous experimental studies have demonstrated that due to the interfacial interdiffusion effect between the coating and substrate, the precipitation of a hard, brittle, topologically close-packed TCP phase is unavoidable at the coating-substrate interface during long-term, high-temperature service. TCP is a detrimental phase to the substrate, significantly reducing its fatigue strength. However, due to the small size of the TCP phase, the geometric dimensions of the diffusion interface containing the TCP phase differ by approximately two to three orders of magnitude from those of the coating or substrate. Therefore, interfacial mechanics analysis models that incorporate realistic TCP morphology are computationally prohibitive during structural calculations, making them difficult to implement in engineering applications.

[0004] Therefore, how to provide a coating-single crystal interface stress and strain measurement method to improve the accuracy of interface stress and strain simulation calculation while maintaining low computing power requirements has become an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a coating-single crystal interface stress and strain measurement method, device, equipment and computer-readable storage medium to solve the problem in the prior art that high interface stress and strain calculation accuracy cannot be achieved with low computing power.

[0006] To solve the above technical problems, the present invention provides a method for measuring stress and strain at a coating-single crystal interface, comprising:

[0007] receiving simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time;

[0008] Determine the target mechanical / physical performance parameters according to the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function;

[0009] The target mechanical / physical property parameters are input into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data based on the target material mechanical / physical property parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0010] Optionally, in the coating-single crystal interface stress and strain measurement method, determining the target mechanical / physical performance parameter according to the simulation independent variable by a preset mechanical / physical performance parameter-space coordinate function includes:

[0011] Determining target mechanical / physical property-time parameters according to the simulation independent variables through a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, wherein the target mechanical / physical property-time parameters include a plurality of target mechanical / physical property parameters related to the heat exposure time;

[0012] Accordingly, inputting the target mechanical / physical property parameters into the finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress and strain field data according to the target material mechanical / physical property parameters and preset boundary conditions, includes:

[0013] The target mechanical / physical property-time parameters are input into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameters and preset boundary conditions.

[0014] Optionally, in the coating-single crystal interface stress and strain measurement method, determining the target mechanical / physical performance parameters according to the simulation independent variables through a preset mechanical / physical performance parameter-spatial coordinate-heat exposure time function includes:

[0015] According to the simulation independent variables, the target mechanical / physical performance parameters are determined by a UMAT subroutine including a preset mechanical / physical performance parameter-spatial coordinate-heat exposure time functional relationship; wherein the UMAT subroutine is a program written in the Fortran programming language.

[0016] Optionally, in the coating-single crystal interface stress and strain measurement method, the diffusion region has a denser grid along the thickness direction compared to the substrate region and the coating region.

[0017] Optionally, in the coating-single crystal interface stress and strain measurement method, the method for obtaining the mechanical / physical property parameter-space coordinate function relationship includes:

[0018] Obtain the mechanical properties data of the interface area material through pre-stored micro-nano mechanical properties test records;

[0019] According to the mechanical property data of the material in the interface area, the mechanical / physical property parameter-space coordinate function relationship is obtained through a volume homogenization algorithm.

[0020] Optionally, in the coating-single crystal interface stress and strain measurement method, after obtaining the stress and strain field data, the method further includes:

[0021] A visualization result is obtained based on the stress-strain field data and the finite element model.

[0022] A coating-single crystal interface stress and strain measurement device, comprising:

[0023] A receiving module, configured to receive simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time;

[0024] A target parameter module is used to determine target mechanical / physical performance parameters according to the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function;

[0025] A calculation module is used to input the target mechanical / physical property parameters into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress and strain field data based on the target material mechanical / physical property parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0026] Optionally, in the coating-single crystal interface stress and strain measurement module, the target parameter module includes:

[0027] a time-related unit, configured to determine, based on the simulation independent variable and through a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, a target mechanical / physical property-time parameter, wherein the target mechanical / physical property-time parameter includes a plurality of target mechanical / physical property parameters related to the heat exposure time;

[0028] Correspondingly, the calculation module also includes a time-related calculation unit, which is used to input the target mechanical / physical property-time parameters into the finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameters and preset boundary conditions.

[0029] A coating-single crystal interface stress and strain measurement device, comprising:

[0030] Memory for storing computer programs;

[0031] A processor is configured to implement the steps of any of the above-described methods for measuring stress and strain at the coating-single crystal interface when executing the computer program.

[0032] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of any of the above-described methods for measuring stress and strain at a coating-single crystal interface.

[0033] The coating-single crystal interface stress and strain measurement method provided by the present invention receives simulation independent variables, which include integration point coordinates, temperature, and heat exposure time; determines target mechanical / physical performance parameters based on the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function; inputs the target mechanical / physical performance parameters into a finite element model of a tested coated single crystal alloy, so that the finite element model outputs corresponding stress and strain field data based on the target material mechanical / physical performance parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0034] Because interdiffusion occurs near the interface between the substrate and coating regions, the physical properties of the diffusion region differ from those of both the substrate and coating regions. However, in establishing the finite element model, the present invention incorporates not only the substrate and coating regions but also the diffusion region, achieving a continuous transition of physical properties near the interface, more accurately reflecting actual conditions and significantly improving the accuracy of stress and strain field calculations. The present invention also provides a coating-single crystal interface stress and strain measurement device, apparatus, and computer-readable storage medium that exhibit the aforementioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0036] Figure 1 A schematic flow chart of a specific embodiment of the method for measuring stress and strain at the coating-single crystal interface provided by the present invention;

[0037] Figure 2 A schematic flow chart of another specific embodiment of the method for measuring stress and strain at the coating-single crystal interface provided by the present invention;

[0038] Figure 3A schematic flow chart of another specific embodiment of the method for measuring stress and strain at the coating-single crystal interface provided by the present invention;

[0039] Figure 4 This is a schematic structural diagram of a specific embodiment of the coating-single crystal interface stress and strain measurement device provided by the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] The core of the present invention is to provide a method for measuring stress and strain at the coating-single crystal interface. The flow diagram of a specific embodiment is as follows: Figure 1 As shown, it is called specific implementation method one, including:

[0042] S101: Receive simulation independent variables, where the simulation independent variables include integration point coordinates, temperature, and heat exposure time.

[0043] S102: Determine target mechanical / physical performance parameters according to the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function.

[0044] The method for obtaining the mechanical / physical performance parameter-space coordinate function includes:

[0045] A1: Obtain the mechanical properties data of the interface area material through pre-stored micro-nano mechanical properties test records.

[0046] The mechanical property data of the interface region material are the mechanical / physical property parameters of each integral point inside the material obtained in an actual micro-nano mechanical property test of the tested coated single crystal alloy.

[0047] A2: Based on the mechanical property data of the interface area material, the mechanical / physical property parameter-space coordinate function relationship is obtained through a volume homogenization algorithm.

[0048] The volume homogenization algorithm is a homogenization theory interface material mechanics algorithm, which can be regarded as averaging the mechanical / physical performance parameters of materials within a certain area for the convenience of calculation. As for how to define the averaging range, it can be determined in combination with the specific situation. Of course, since the finite element model of the coated single crystal alloy under test in the present invention is divided into three areas: matrix area, diffusion area and coating area, each area corresponds to at least one averaged mechanical / physical performance parameter of the material, that is, the matrix area, the diffusion area and the coating area are regarded as uniformly distributed areas with the same mechanical / physical performance parameters (the corresponding mechanical / physical performance parameters are the average values ​​of the mechanical / physical performance parameters of all integral points in the area).

[0049] S103: Input the target mechanical / physical property parameters into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data based on the target material mechanical / physical property parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0050] As a preferred embodiment, the diffusion zone has a denser mesh along the thickness direction than the substrate and coating zones to improve calculation accuracy. This denser mesh generates more integration points, allowing for a more detailed stress and strain distribution, effectively improving the accuracy of stress and strain predictions.

[0051] The coating-single crystal interface stress and strain measurement method provided by the present invention receives simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time; determines target mechanical / physical performance parameters based on the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function; inputs the target mechanical / physical performance parameters into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress and strain field data based on the target material mechanical / physical performance parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction. Since mutual diffusion occurs near the contact interface between the substrate region and the coating region, the physical properties of the diffusion region are different from those of the substrate region and the coating region. In the process of establishing the finite element model, the present invention not only sets the substrate region and the coating region, but also sets the diffusion region, thereby achieving a continuous transition of physical properties near the interface, which is closer to the actual situation and greatly improves the calculation accuracy of the stress and strain field.

[0052] On the basis of the first embodiment, the method of obtaining the target mechanical / physical performance parameters is further improved to obtain the second embodiment, the flow chart of which is as follows: Figure 2 Shown, including:

[0053] S201: Receive simulation independent variables, where the simulation independent variables include integration point coordinates, temperature, and heat exposure time.

[0054] S202: According to the simulation independent variable, the target mechanical / physical property-time parameter is determined through a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, wherein the target mechanical / physical property-time parameter includes a plurality of target mechanical / physical property parameters related to the heat exposure time.

[0055] It's important to note that in this step, each integration point is assigned a target mechanical / physical property-time parameter, meaning a set of mechanical / physical property parameters that vary with the thermal exposure time. Of course, the mechanical / physical property parameter-spatial coordinate-thermal exposure time function is also a function of the mechanical / physical property parameter-spatial coordinate-thermal exposure time relationship, derived from the mechanical property data of the interface region using a volume homogenization algorithm.

[0056] As a specific embodiment, according to the simulation independent variables, the target mechanical / physical performance parameters are determined by a UMAT subroutine including a preset mechanical / physical performance parameter-spatial coordinate-heat exposure time functional relationship; wherein, the UMAT subroutine is a general-purpose commercial finite element software program written in the Fortran programming language.

[0057] Currently, the more common finite element software platform on the market is the ABAQUS platform. However, the ABAQUS platform does not support setting multiple mechanical / physical performance-time parameters for a single integration point. Therefore, staff can use the Fortran programming language and refer to the ABAQUS platform's requirements for the user subroutine secondary development interface to compile an interface physical property transfer calculation user material subroutine plug-in (UMAT).

[0058] S203: Inputting the target mechanical / physical property-time parameters into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0059] The UMAT subroutine is used in the finite element model to assign material mechanical / physical property parameters to each integration point to simulate the non-uniform distribution of mechanical / physical property parameters caused by material microstructure evolution during long-term high-temperature service.

[0060] The boundary conditions are the actual load borne by the tested coated single crystal alloy in actual use scenarios, and are the boundary conditions such as temperature, displacement, and stress applied by the finite element model.

[0061] In this specific embodiment, first, the relationship between the mechanical / physical properties of the material and the changes in space and time is obtained through micro-nanomechanical experiments. Then, the average mechanical / physical performance parameters corresponding to the homogenized theoretical interface material mechanics are used. Finally, the calculation results are brought into the finite element calculation. By setting the mechanical / physical performance parameters as parameters that change continuously with time, the simulation scenario is closer to the actual situation, which greatly improves the accuracy of the simulation calculation and is more instructive for the actual material production and use.

[0062] The following is a specific example of interface stress analysis (using ABAQUS software as an example), including:

[0063] a) Use ABAQUS software to call the compiled UMAT subroutine, assign the initial calculation and analysis step size, and perform calculation and analysis on the established finite element model;

[0064] b) The finite element analysis software transmits information such as the coordinates of the integration point of the interface diffusion zone material, the temperature, and the thermal exposure time to the UMAT subroutine. The subroutine calculates the corresponding mechanical / physical performance parameters of the integration point of the analysis diffusion zone based on the functional relationship between the mechanical / physical properties, spatial coordinates, and thermal exposure time of the material obtained from the micro-nanomechanics test, and transmits the parameters back to the finite element analysis software;

[0065] c) The software determines whether the calculated stress and strain fields have converged based on the principle of minimum potential energy: if the calculation results converge, the analysis step size remains unchanged and the next calculation step is entered; if the calculation results do not converge, the calculation step size is re-subdivided.

[0066] On the basis of the second embodiment, the stress-strain field data is further improved to obtain the third embodiment, the flow chart of which is as follows: Figure 3 Shown, including:

[0067] S301: Receive simulation independent variables, where the simulation independent variables include integration point coordinates, temperature, and heat exposure time.

[0068] S302: According to the simulation independent variable, the target mechanical / physical property-time parameter is determined through a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, wherein the target mechanical / physical property-time parameter includes a plurality of target mechanical / physical property parameters related to the heat exposure time.

[0069] S303: Input the target mechanical / physical property-time parameters into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0070] S304: Obtaining a visualization result based on the stress-strain field data and the finite element model.

[0071] In this specific implementation, the obtained stress-strain field data is further visualized, which greatly improves the readability of the stress-strain field and is more instructive for the improvement of the workpiece.

[0072] Continuing with ABAQUS software as an example, we will explain a visualization post-processing of calculation results, including:

[0073] a) Use internal variables to store and transfer the calculation results of each integration point to the ABAQUS finite element;

[0074] b) Create separate user-defined variables in UMAT to store the calculated material mechanical / physical properties;

[0075] c) The calculation results were visualized using the ABAUS software post-processing module to obtain material property transfer and stress-strain analysis taking into account the interface microstructure evolution during long-term high-temperature service.

[0076] For coated structures operating in high-temperature environments, failure is often driven by a combination of thermal mismatch stress and applied mechanical loads. Therefore, an interface physical property transfer model program must be able to accurately and stably calculate the stress-strain response of the structure under thermal and mechanical loads. The following uses the method described in this invention to calculate the internal stress-strain behavior of coated single-crystal alloys under the combined effects of thermal and mechanical loads, and the calculation process and results are described in detail.

[0077] First, a Bruker UMT-2 nanoindentation tester was used to measure the distribution of the interfacial elastic modulus of the coated single-crystal alloy. The results showed that along the coating thickness, the elastic modulus first increases and then decreases with increasing depth. The average elastic modulus at approximately 2.5 to 5 μm from the interface is significantly greater than that of the substrate. Furthermore, the maximum elastic modulus increases with increasing high-temperature operating time.

[0078] Then, the interface mechanical / physical performance parameters obtained from the micro-nanomechanical test results are brought into the finite element software through the UMAT subroutine to achieve a continuous transition of the physical properties of the interface material. When performing stress-strain analysis, the finite element software first reads the spatial coordinates of the integration point, thermal exposure time, and other information. Then, based on the micro-nanomechanical test results, the stiffness matrix of each integration point in the interface area is converted. Finally, the stress value of the integration point is calculated, as shown in the following formula (1):

[0079]

[0080] Where Cij(t) is the equivalent modulus (i, j = 1, 2…6), a function of the spatial coordinates of the integration point and the thermal exposure time, ε is the strain value at the integration point, automatically determined by the finite element software, and σ is the stress value at that integration point. The interface material property transfer model (i.e., the finite element model) establishes the relationship between the mechanical properties of the coating-single crystal alloy interface material and time and space, enabling efficient and accurate calculation of the mechanical properties of the coating-single crystal alloy interface. This method achieves a continuous transition of interface mechanical / physical properties, avoiding the stress singularities caused by discontinuous interface mechanical / physical properties in traditional layered calculation methods.

[0081] The coating-single crystal interface stress and strain measurement device provided by an embodiment of the present invention is introduced below. The coating-single crystal interface stress and strain measurement device described below and the coating-single crystal interface stress and strain measurement method described above can be referenced to each other.

[0082] Figure 4 The structural block diagram of the coating-single crystal interface stress and strain measurement device provided by the embodiment of the present invention is shown in FIG. Figure 4 The coating-single crystal interface stress and strain measurement device may include:

[0083] A receiving module 100 is configured to receive simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time;

[0084] A target parameter module 200 is configured to determine target mechanical / physical performance parameters based on the simulation independent variables by using a preset mechanical / physical performance parameter-space coordinate function;

[0085] The calculation module 300 is used to input the target mechanical / physical property parameters into the finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress and strain field data based on the target material mechanical / physical property parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction.

[0086] As a preferred embodiment, the target parameter module 200 includes:

[0087] a time-related unit, configured to determine, based on the simulation independent variable and through a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, a target mechanical / physical property-time parameter, wherein the target mechanical / physical property-time parameter includes a plurality of target mechanical / physical property parameters related to the heat exposure time;

[0088] Correspondingly, the calculation module 300 also includes a time-related calculation unit, which is used to input the target mechanical / physical property-time parameters into the finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameters and preset boundary conditions.

[0089] As a preferred embodiment, the time-dependent calculation unit includes:

[0090] The UMAT subroutine unit is used to determine the target mechanical / physical performance parameters according to the simulation independent variables through a UMAT subroutine including a preset mechanical / physical performance parameter-spatial coordinate-heat exposure time function relationship; wherein the UMAT subroutine is a program written in the Fortran programming language.

[0091] As a preferred embodiment, the coating-single crystal interface stress and strain measurement device includes a function module for obtaining the mechanical / physical performance parameter-space coordinate function relationship, including:

[0092] An experimental data unit is used to obtain mechanical property data of materials in the interface area through pre-stored micro-nano mechanical property test records;

[0093] The uniform algorithm unit is used to obtain the mechanical / physical performance parameter-space coordinate function relationship based on the mechanical performance data of the interface area material through a volume uniformization algorithm.

[0094] As a preferred embodiment, the calculation module 300 further includes:

[0095] A visualization unit is used to obtain visualization results based on the stress-strain field data and the finite element model.

[0096] The coating-single crystal interface stress and strain measurement device provided by the present invention comprises a receiving module 100 for receiving simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time; a target parameter module 200 for determining target mechanical / physical performance parameters based on the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function; and a calculation module 300 for inputting the target mechanical / physical performance parameters into a finite element model of a coated single crystal alloy under test, so that the finite element model outputs corresponding stress and strain field data based on the target material mechanical / physical performance parameters and preset boundary conditions. The finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction. Since mutual diffusion occurs near the contact interface between the substrate region and the coating region, the physical properties of the diffusion region are different from those of the substrate region and the coating region. In the process of establishing the finite element model, the present invention not only sets the substrate region and the coating region, but also sets the diffusion region, thereby achieving a continuous transition of physical properties near the interface, which is closer to the actual situation and greatly improves the calculation accuracy of the stress and strain field.

[0097] The coating-single crystal interface stress and strain measurement device of this embodiment is used to implement the aforementioned coating-single crystal interface stress and strain measurement method. Therefore, the specific implementation of the coating-single crystal interface stress and strain measurement device can be seen in the embodiment of the coating-single crystal interface stress and strain measurement method in the above text. For example, the receiving module 100, the target parameter module 200, and the calculation module 300 are respectively used to implement steps S101, S102 and S103 in the aforementioned coating-single crystal interface stress and strain measurement method. Therefore, its specific implementation can refer to the description of the corresponding embodiments of each part and will not be repeated here.

[0098] A coating-single crystal interface stress and strain measurement device, comprising:

[0099] memory for storing computer programs;

[0100] A processor is configured to implement the steps of any of the above-described coating-single crystal interface stress and strain measurement methods when executing the computer program. The coating-single crystal interface stress and strain measurement method provided by the present invention receives simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time; according to the simulation independent variables, the target mechanical / physical performance parameters are determined by a preset mechanical / physical performance parameter-space coordinate function; the target mechanical / physical performance parameters are input into a finite element model of the coated single crystal alloy under test, so that the finite element model outputs corresponding stress and strain field data according to the target material mechanical / physical performance parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction. Since mutual diffusion occurs near the contact interface between the substrate region and the coating region, the physical properties of the diffusion region are different from those of the substrate region and the coating region. In the process of establishing the finite element model, the present invention not only sets the substrate region and the coating region, but also sets the diffusion region, thereby achieving a continuous transition of physical properties near the interface, which is closer to the actual situation and greatly improves the calculation accuracy of the stress and strain field.

[0101] A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the above-described coating-single crystal interface stress and strain measurement methods. The coating-single crystal interface stress and strain measurement method provided by the present invention receives simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature, and heat exposure time; determines target mechanical / physical performance parameters based on the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function; inputs the target mechanical / physical performance parameters into a finite element model of a tested coated single crystal alloy, so that the finite element model outputs corresponding stress and strain field data based on the target material mechanical / physical performance parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region, and a coating region in sequence along the thickness direction. Since mutual diffusion occurs near the contact interface between the substrate area and the coating area, the physical properties of the diffusion area are different from those of the substrate area and the coating area. In the process of establishing the finite element model, the present invention not only sets up the substrate area and the coating area, but also sets up the diffusion area, thereby realizing a continuous transition of the physical properties near the interface, being closer to the actual situation, and greatly improving the calculation accuracy of the stress and strain field.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Reference can be made to the descriptions of the identical or similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the methods.

[0103] It should be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0104] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0105] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0106] The coating-single crystal interface stress and strain measurement method, device, equipment and computer-readable storage medium provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A coating-single crystal interface stress and strain measurement method, characterized in that: include: receiving simulation independent variables, the simulation independent variables including integration point coordinates, temperature, and heat exposure time; According to the simulation independent variables, the target mechanical / physical performance parameters are determined by a preset mechanical / physical performance parameter-space coordinate function; Input the target mechanical / physical property parameters into the finite element model of the tested coated single crystal alloy, so that the finite element model outputs corresponding stress-strain field data according to the target material mechanical / physical property parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region and a coating region in sequence along the thickness direction; According to the simulation independent variables, the target mechanical / physical performance parameters are determined by the preset mechanical / physical performance parameter-space coordinate function, including: According to the simulation independent variable, a target mechanical / physical property-time parameter is determined by a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, wherein the target mechanical / physical property-time parameter includes a plurality of target mechanical / physical property parameters related to the heat exposure time; Accordingly, the step of inputting the target mechanical / physical property parameters into the finite element model of the tested coated single crystal alloy so that the finite element model outputs corresponding stress-strain field data according to the target material mechanical / physical property parameters and preset boundary conditions includes: Inputting the target mechanical / physical property-time parameter into a finite element model of the tested coated single crystal alloy, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameter and preset boundary conditions; The method for obtaining the mechanical / physical performance parameter-space coordinate function relationship includes: Obtain the mechanical properties data of the interface area material through the pre-stored micro-nano mechanical properties test records; According to the mechanical property data of the material in the interface region, the mechanical / physical property parameter-space coordinate function relationship is obtained through a volume homogenization algorithm.

2. The coating-single crystal interface stress-strain measurement method according to claim 1, characterized in that: According to the simulation independent variables, the target mechanical / physical performance parameters are determined by the preset mechanical / physical performance parameter-spatial coordinate-heat exposure time function, including: According to the simulation independent variables, the target mechanical / physical performance parameters are determined by a UMAT subroutine including a preset mechanical / physical performance parameter-spatial coordinate-heat exposure time functional relationship; wherein the UMAT subroutine is a program written in the Fortran programming language.

3. The coating-single crystal interface stress-strain measurement method according to claim 1, characterized in that: The diffusion zone has a denser grid along the thickness direction than the substrate zone and the coating zone.

4. The coating-single crystal interface stress-strain measurement method according to claim 1, characterized in that: After obtaining the stress-strain field data, the method further includes: A visualization result is obtained according to the stress-strain field data and the finite element model.

5. A coating-single crystal interface stress and strain measurement device, characterized in that: include: A receiving module, used for receiving simulation independent variables, wherein the simulation independent variables include integration point coordinates, temperature and heat exposure time; A target parameter module, used to determine the target mechanical / physical performance parameters according to the simulation independent variables through a preset mechanical / physical performance parameter-space coordinate function; A calculation module, used for inputting the target mechanical / physical property parameters into a finite element model of the tested coated single crystal alloy, so that the finite element model outputs corresponding stress-strain field data according to the target material mechanical / physical property parameters and preset boundary conditions; wherein the finite element model includes a substrate region, a diffusion region and a coating region in sequence along the thickness direction; The target parameter module includes: A time-related unit, used to determine a target mechanical / physical property-time parameter according to the simulation independent variable through a preset mechanical / physical property parameter-spatial coordinate-heat exposure time function, wherein the target mechanical / physical property-time parameter includes a plurality of target mechanical / physical property parameters related to the heat exposure time; Correspondingly, the calculation module further includes a time-dependent calculation unit, which is used to input the target mechanical / physical property-time parameter into the finite element model of the tested coated single crystal alloy, so that the finite element model outputs corresponding stress-strain field data according to the target mechanical / physical property-time parameter and preset boundary conditions; It includes a function module for obtaining the mechanical / physical performance parameter-space coordinate function relationship, including: The experimental data unit is used to obtain the mechanical property data of the interface area material through the pre-stored micro-nano mechanical property test records; The uniform algorithm unit is used to obtain the mechanical / physical performance parameter-space coordinate function relationship based on the mechanical performance data of the interface area material through a volume uniformization algorithm.

6. A coating-single crystal interface stress and strain measurement device, characterized in that: include: Memory for storing computer programs; A processor is used to implement the steps of the coating-single crystal interface stress and strain measurement method as described in any one of claims 1 to 4 when executing the computer program.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the coating-single crystal interface stress and strain measurement method according to any one of claims 1 to 4 are implemented.

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