Method and device for determining crack propagation capability of plate and electronic equipment

Abstract

The invention provides a method and device for determining the crack propagation capacity of a plate and electronic equipment, and relates to the field of plate performance detection, in particular to the method and device for determining the crack propagation capacity of the plate, in the process of performing a bulging experiment on the target plate, a load displacement curve of the target plate is obtained; intercepting a line segment between the highest point of the load displacement curve and the end point of the load displacement curve as a target line segment; according to the slope value of the target line segment, the crack propagation resistance index of the target board is determined, and the crack propagation resistance index represents the edge cracking resistance of a board product from the target board.

Description

Technical Field

[0001] This invention relates to the field of sheet metal performance testing, and in particular to a method, apparatus, and electronic device for determining the crack propagation capacity of sheet metal. Background Technology

[0002] As the strength of automotive materials continues to increase, their formability is gradually decreasing, especially the problem of edge cracking during stamping (caused by burrs and initial microcracks on the stamping surface, which gradually propagate into the interior of the sheet metal during stamping deformation, eventually resulting in unacceptable edge cracking damage). This has become a key limiting factor for the further application of high-strength automotive steel sheets in vehicle bodies. Therefore, it is particularly important to evaluate and predict the edge cracking performance of high-strength steel sheets in advance to provide effective guidance for sheet development and use. However, there is currently no relevant evaluation method to quantitatively evaluate the crack propagation capacity of automotive steel sheets, especially high-strength automotive steel sheets. Summary of the Invention

[0003] This invention provides a method, apparatus, and electronic device for determining the crack propagation capability of a sheet metal, which solves the problem in related technologies that cannot evaluate the crack propagation capability of a sheet metal.

[0004] In a first aspect, the present invention provides a method for determining the crack propagation capability of a sheet metal, the method comprising: During the bulging test on the target sheet, the load-displacement curve of the target sheet is obtained; The line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve is taken as the target line segment. Based on the slope value of the target line segment, the crack propagation resistance index of the target board is determined, and the crack propagation resistance index characterizes the ability of the board product from which the target board originates to resist edge cracking.

[0005] Optionally, the edge region of the target board has a notch, and the notch is symmetrical with respect to the center line that bisects the edge region.

[0006] Optionally, the bulging test process includes N time periods, and the step of obtaining the load-displacement curve of the target plate during the bulging test includes: During the bulging test on the target plate, the load applied to the target plate and the displacement of the target plate under the pressure of the load are recorded at each time point. The load-displacement curve of the target plate is obtained based on the load recorded in the N time periods and the displacement corresponding to the load recorded in each time period.

[0007] Optionally, the method further includes: If the difference between the load recorded in the current time period and the load recorded in the target time period is greater than a preset threshold, the bulging experiment ends in the current time period, and the load recorded in the target time period is the maximum value among the loads recorded in the N time periods.

[0008] Optionally, determining the crack propagation resistance index of the target plate based on the slope value of the target line segment includes: The slope of the target line segment is calculated using the least squares method. The crack propagation resistance index of the target plate is determined based on the absolute value of the slope value.

[0009] Optionally, determining the crack propagation resistance index of the target plate based on the absolute value of the slope value includes: The crack propagation resistance index of the target plate is calculated using the following formula:

[0010] Where T is the crack propagation resistance index of the target plate, and G is the absolute value of the slope value.

[0011] Secondly, the present invention provides a device for determining the crack propagation capability of a sheet metal, the device comprising: The acquisition module is used to acquire the load-displacement curve of the target sheet during the bulging test. The interception module is used to intercept the line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve as the target line segment. The determination module is used to determine the crack propagation resistance index of the target board based on the slope value of the target line segment. The crack propagation resistance index characterizes the ability of the board product from which the target board originates to resist edge cracking.

[0012] Thirdly, the present invention provides an electronic device, comprising: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the method as provided in the first aspect.

[0013] Fourthly, the present invention provides a storage medium that, when instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the method provided in the first aspect.

[0014] Fifthly, the present invention provides a computer program product comprising a computer program that is executed by a processor as described in the first aspect.

[0015] According to the method for determining the crack propagation capability of sheet metal provided by this invention, during the bulging test of the target sheet metal, the load-displacement curve of the target sheet metal is obtained; the line segment between the highest point and the end point of the load-displacement curve is extracted as the target line segment; based on the slope value of the target line segment, the crack propagation resistance index of the target sheet metal is determined, and the crack propagation resistance index characterizes the ability of the sheet metal product from which the target sheet metal originates to resist edge cracking. Thus, by combining the target line segment in the load-displacement curve, the crack propagation resistance index characterizing the edge cracking resistance of the target sheet metal is determined, and the edge tensile crack propagation capability of the sheet metal is quantitatively evaluated, which to some extent solves the problem in related technologies that cannot evaluate the crack propagation capability of sheet metal. Furthermore, it can optimize and guide the development of automotive sheet metal, and improve the edge tensile forming capability of materials. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating a method for determining the crack propagation capability of a sheet metal according to an embodiment of the present invention; Figure 2 A structural concept diagram of a target plate provided in an embodiment of the present invention; Figure 3 A conceptual drawing of a flat-head bulging test mold provided in an embodiment of the present invention; Figure 4 A conceptual diagram of a load-displacement curve provided for an embodiment of the present invention; Figure 5 A conceptual diagram of another load-displacement curve provided for an embodiment of the present invention. Figure 6 A conceptual diagram of a target line segment provided in an embodiment of the present invention; Figure 7 A conceptual diagram of another target line segment provided in an embodiment of the present invention; Figure 8 A structural block diagram of a device for determining the crack propagation capability of a plate according to an embodiment of the present invention; Figure 9 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0018] As described in the background section, China's automotive industry is developing rapidly. Due to increasingly severe energy consumption and higher safety requirements, cost-reduction and fuel-saving solutions, primarily lightweight technologies, are being increasingly applied to automotive parts manufacturing. However, as the strength of automotive materials continues to increase, their formability is gradually decreasing. In particular, the problem of edge cracking during sheet metal stamping has become a key constraint on the further application of high-strength automotive sheets in vehicle bodies. Therefore, it is crucial to evaluate and predict the edge cracking performance of high-strength steel sheets in advance to provide effective guidance for sheet metal development and use.

[0019] Stamping edge cracking is often caused by burrs and initial microcracks on the stamping cut surface. As the stamping deformation progresses, the microcracks gradually extend into the interior of the sheet metal, eventually resulting in unacceptable edge cracking damage. Therefore, whether the crack is easy to extend inside the sheet metal has a significant impact on stamping edge cracking. However, there is currently no relevant evaluation method to quantitatively evaluate the crack propagation ability of automotive sheet metal, especially high-strength automotive sheet metal.

[0020] This invention provides a method for determining the crack propagation capability of sheet metal. According to this method, during a bulging test on a target sheet metal, a load-displacement curve of the target sheet metal is obtained. A line segment between the highest point and the end point of the load-displacement curve is extracted as a target line segment. Based on the slope of the target line segment, the crack propagation resistance index of the target sheet metal is determined. The crack propagation resistance index characterizes the ability of the sheet metal product from which the target sheet metal originates to resist edge cracking. Thus, by combining the target line segment in the load-displacement curve, the crack propagation resistance index, which characterizes the edge cracking resistance of the target sheet metal, is determined, allowing for a quantitative evaluation of the edge tensile crack propagation capability of the sheet metal. This addresses, to some extent, the problem in related technologies where the crack propagation capability of sheet metal cannot be evaluated. Furthermore, it can optimize and guide the development of automotive sheet metal, improving the edge tensile forming capability of materials.

[0021] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] It should be understood that the method for determining the crack propagation capability of sheet metal provided in this embodiment of the invention can be executed by a target device. The target device can be a device for determining the crack propagation capability of sheet metal, namely a Programmable Logic Controller (PLC), which can be a single electronic device or multiple electronic devices working together. The electronic device can be a server, such as a standalone physical server, a server cluster consisting of multiple servers, or a cloud server capable of cloud computing.

[0023] Figure 1 A flowchart illustrating a method for determining the crack propagation capability of a sheet metal according to an embodiment of the present invention. Figure 1 As shown, the method for determining the crack propagation capability of a plate provided in this embodiment of the invention includes steps 110 to 130.

[0024] Step 110: During the bulging test on the target plate, the load-displacement curve of the target plate is obtained.

[0025] In this embodiment of the invention, the target board can be a sample of any batch of board products made of any material; for example, the target board can be a sample of at least one batch of board products. This embodiment of the invention does not impose specific limitations in this regard.

[0026] In this embodiment of the invention, a metal sheet stamping machine can be used to perform a bulging test on the target sheet. During the bulging test, the target device can obtain the load-displacement curve of the target sheet by receiving data from the metal sheet stamping machine.

[0027] In this embodiment of the invention, the load-displacement curve of the target plate can describe the deformation of the target plate under different loads (that is, the displacement of the target plate can be understood as the distance between the highest point of the deformation of the target plate and the horizontal line where the target plate is located under the action of the load), and the recorded loads and corresponding displacements are connected to obtain the load-displacement curve of the target plate.

[0028] In this embodiment of the invention, after obtaining the load-displacement curve of the target plate, the target device can execute step 120 to determine the crack propagation capability of the target plate based on the load-displacement curve of the target plate.

[0029] Step 120: Extract the line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve as the target line segment.

[0030] In this embodiment of the invention, since the crack propagation capability of the target sheet is being determined, during the bulging test of the target sheet in step 110, the load can be applied to the maximum value that the target sheet can withstand. At this point, the deformation displacement of the target sheet also reaches its maximum value, i.e., the highest point on the load-displacement curve is obtained. That is to say, the highest point of the load-displacement curve represents the load at which the target sheet breaks. Subsequently, after the target sheet breaks, the displacement of the target sheet will also decrease (the target sheet collapses due to the breakage, moving closer to the horizontal line where the target sheet is located). At the same time, after detecting that the target sheet has broken, the metal sheet stamping machine will gradually reduce the load applied to the target sheet, so that the entire load-displacement curve shows a trend of first rising and then falling.

[0031] In this embodiment of the invention, the end point of the load-displacement curve can be the data corresponding to the end time of the bulging test of the target plate. By taking the line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve as the target line segment, the data record of the target plate undergoing deformation and cracking during the bulging test can be obtained, thereby executing step 130 to determine the crack propagation resistance index of the target plate.

[0032] Step 130: Determine the crack propagation resistance index of the target board based on the slope value of the target line segment. The crack propagation resistance index characterizes the ability of the board product from which the target board originates to resist edge cracking.

[0033] In this embodiment of the invention, after determining the target line segment, the slope value of the target line segment can be calculated to determine the linear relationship between the displacement of the target plate and the load, thereby determining the crack propagation resistance index of the target plate based on the slope value of the target line segment. For example, the slope value of the target line segment itself can be used as the crack propagation resistance index of the target line segment, or the slope value of the target line segment can be processed twice to obtain the crack propagation resistance index of the target plate, thereby obtaining the ability of the plate product from which the target plate originates to resist edge cracking. Furthermore, the crack propagation resistance index of the target plate can guide the production process of the plate product, such as adjusting process parameters and optimizing the process flow. It can also guide the subsequent processing of the plate product; for example, if the performance is poor, the product can be scrapped, and if the performance is good, it can be released to the market.

[0034] According to the method for determining the crack propagation capability of sheet metal provided by this invention, during the bulging test of the target sheet metal, the load-displacement curve of the target sheet metal is obtained; the line segment between the highest point and the end point of the load-displacement curve is extracted as the target line segment; based on the slope value of the target line segment, the crack propagation resistance index of the target sheet metal is determined, and the crack propagation resistance index characterizes the target sheet metal's ability to resist edge cracking. Thus, by combining the target line segment in the load-displacement curve, the crack propagation resistance index characterizing the target sheet metal's ability to resist edge cracking is determined, and the edge tensile crack propagation capability of the sheet metal is quantitatively evaluated, which to some extent solves the problem in related technologies that cannot evaluate the crack propagation capability of sheet metal. Furthermore, it can optimize and guide the development of automotive sheet metal, and improve the edge tensile forming capability of materials.

[0035] In this embodiment of the invention, the edge region of the target material has a notch, and the notch is symmetrical with respect to the midline that bisects the edge region. The edge region of the target material can be the long side and / or the wide side of the target material. In this embodiment of the invention, the long side can be selected for the bulging test. After selecting the edge region, the notch can be divided according to the midline of the edge region. In order to make the target material be subjected to uniform stress in the bulging test, the notch on the target material can be symmetrical with respect to the midline of the bisected edge region. Specifically, the shape of the target material can be a rectangle including the notch, for example, linear or arc-shaped notches are distributed in the middle of the two opposite sides of the target material. Figure 2 As shown. To better determine the crack propagation capacity of the target plate, if the notch on the target plate is a small arc shape, the radius of the small arc can be between 0-2.5mm; if the notch on the target plate is a linear tip (e.g., a triangle), the tip width of the linear notch can be less than 0.5mm, the length less than 5mm, and the overall width of the notch area on the target plate can be between 30-100mm.

[0036] In this embodiment of the invention, in order to reduce the number of repetitions of the experiment, when selecting the target plate, a target plate with greater strength can be selected. For example, the material strength of the target plate can be greater than 220MPa, and the thickness of the target plate can be between 0.8-3.5mm.

[0037] In this embodiment of the invention, the bulging experiment includes N time periods. Step 110, the specific implementation of obtaining the load-displacement curve of the target sheet during the bulging experiment, may include the following steps: during the bulging experiment, the load applied to the target sheet and the displacement of the target sheet under the pressure of the load are recorded in each time period; based on the load recorded in the N time periods and the displacement corresponding to the load recorded in each time period, the load-displacement curve of the target sheet is obtained.

[0038] In this embodiment of the invention, during the bulging test on the target sheet, the duration of the bulging test can include N time periods, where each time period can be 0.02s or less. That is, during the bulging test on the target sheet, the value of the load applied to the target sheet and the displacement of the target sheet under the current load pressure are recorded every 0.02s. When recording the load, the unit of load can be a force-related unit, N. The displacement of the target sheet under the current load pressure can be represented by the distance between the highest point of deformation of the target sheet and the horizontal line where the target sheet is located.

[0039] In this embodiment of the invention, after N time periods, a coordinate axis can be plotted. The vertical axis represents the numerical value of the load applied to the target plate at that time, and the horizontal axis represents the displacement of the target plate under the current load pressure. Connecting the N points directly yields the load-displacement curve of the target plate. Furthermore, in this embodiment, the values ​​obtained from the N time periods can be cleaned, and a portion of the data can be used for curve simulation to obtain the load-displacement curve of the target plate. Since the edge of the target plate includes notches, the load-displacement curve obtained during the bulging experiment of the target plate can characterize the crack resistance of the target plate's edge, thereby determining the crack propagation resistance index of the target plate.

[0040] In this embodiment of the invention, the load-displacement curve of the target plate shows a trend of first rising and then falling. The time period that reaches the highest point of the load-displacement curve (i.e., the maximum load value recorded in N time periods) can be determined as the target time period. Subsequently, the load applied in each time period after the target time period and the deformation displacement generated by the target plate are recorded step by step. If, after a certain time period, the difference between the recorded load and the maximum load value is greater than a preset threshold, the target device can issue a command to stop and end the bulging experiment. The metal sheet stamping machine responds to the stop command issued by the target device and ends the bulging experiment on the target plate. The preset threshold can be 100N or 200N, and this embodiment does not impose a specific limitation on it. It should be understood that, since the target device needs processing time to judge the difference and issue the stop command, and the metal sheet stamping machine also needs reaction time to respond to the stop command, in actual process, the difference between the load value at the end of the period and the load value of the target time period will be appropriately greater than the preset threshold. By using the preset threshold, the bulging experiment can be ended as soon as possible after the target plate breaks, reducing the experimental time and improving the efficiency of determining the crack propagation index of the target plate.

[0041] In one embodiment of the present invention, after obtaining the target line segment, step 130, which determines the crack propagation resistance index of the target plate based on the slope value of the target line segment, may include the following steps: calculating the slope value of the target line segment using the least squares method, and determining the crack propagation resistance index based on the absolute value of the slope value.

[0042] In this embodiment of the invention, after obtaining the target line segment, the slope value of the target line segment can be calculated by the least squares method. For example, the absolute value of the slope value of the target line segment can be determined by the following formula (1): (1) Where G is the absolute value of the slope of the target line segment. Let be the displacement value of the i-th point on the target line segment. This is the average displacement value of n points on the target line segment. Let be the load value at the i-th point on the target line segment. This is the average load value of n points on the target line segment.

[0043] Furthermore, the absolute value of the slope obtained by formula (1) can be refined, for example, by using a preset ratio or by adding error processing, to obtain the crack propagation resistance index of the target plate. The crack propagation resistance index of the target plate can also be calculated by the following formula (2): (2) Where T is the crack propagation resistance index of the target plate, and G is the absolute value of the slope value.

[0044] Thus, by combining the target line segment in the load-displacement curve, the crack propagation resistance index, which characterizes the target sheet's resistance to edge cracking, is determined, allowing for a quantitative evaluation of the sheet's edge tensile crack propagation capability. This addresses, to some extent, the problem of evaluating the crack propagation capability of sheet materials in related technologies. Furthermore, it enables the optimization and guidance of automotive sheet material development, improving the material's edge tensile forming capability.

[0045] To better understand the method for improving the crack propagation capability of sheet metal provided in the embodiments of the present invention, examples are given below. It should be understood that these examples are not intended to be limiting.

[0046] (1) Sample preparation. The two materials to be evaluated (samples of the two materials can be cut separately and used as target plates in sequence) are cut using wire cutting. Figure 2 The materials were processed to the dimensions shown. The basic mechanical properties and porosity of the two materials are shown in Table 1. It can be seen that material 1 has a higher elongation but a lower porosity, while material 2 has a lower elongation but a higher porosity. Therefore, it can be concluded that material 1 is more prone to edge cracking, and it is speculated that its crack propagation resistance is weaker.

[0047] Table 1

[0048] (2) Bulging test. The processed specimen is bulged using a flat-head bulging test mold, and the load-displacement curve during the bulging process is output simultaneously. A schematic diagram of the test mold is shown below. Figure 3 As shown. Figure 2 The target board shown ( Figure 2 The sample (from the sample) is placed into the mold, and a load is applied to the center of the target plate through the punch. Finally, the desired result is obtained using material #1. Figure 4 The load-displacement curves shown indicate that material 2 yields the following results. Figure 5 The load-displacement curve is shown.

[0049] (3) Data processing. Extract the linearly decreasing force value portion from the load-displacement curve, such as... Figure 4 or Figure 5 As shown, from Figure 4 The linear attenuation portion of material 1 is selected from the load-displacement curve, i.e., as shown in the figure. Figure 6 As shown, the data for the target line segment of material 1 can include D1[(13.441, 44.016), (13.498, 43.039), (13.589, 42.108)]. Correspondingly, as... Figure 7As shown, the data for the target line segment of material 2 can include D2[(13.441, 44.017), (13.449, 43.909), (13.458, 43.776)]. Based on the least squares method, the slope value of the load-displacement curve in the attenuation stage is calculated according to Formula 1 above, and the absolute value is taken. In the formula, G is the slope value, Li is the displacement value at the i-th point, and Ti is the load value at the i-th point. The absolute slope value of material 1 is 14.107, and the absolute slope value of material 2 is 11.598.

[0050] (4) Calculate the crack propagation index. Based on the slope value of the load-displacement curve obtained in the attenuation stage, the crack propagation index of the two materials is calculated as T1=0.071 and T2=0.086 respectively according to Formula 2. Therefore, it can be seen that material 1 has stronger crack sensitivity, while material 2 has slightly weaker crack sensitivity, which is consistent with the characteristics of the two materials recorded in Table 1.

[0051] The method for assessing the crack propagation capability of sheet metal provided in this invention solves, to some extent, the problem of effectively and accurately evaluating the edge crack resistance of automotive sheet metal, especially high-strength automotive sheet metal, thereby optimizing and guiding the development of automotive sheet metal materials and improving the edge stretching and forming capability of the materials.

[0052] Figure 8 This is a structural block diagram of the device for determining the crack propagation capability of a plate according to an embodiment of the present invention. Figure 8 As shown, the apparatus 800 for determining the crack propagation capability of a plate material provided in this embodiment of the invention includes: The acquisition module 810 is used to acquire the load-displacement curve of the target plate during the bulging test of the target plate. The interception module 820 is used to intercept the line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve as the target line segment. The determination module 830 is used to determine the crack propagation resistance index of the target board based on the slope value of the target line segment. The crack propagation resistance index characterizes the ability of the board product from which the target board originates to resist edge cracking.

[0053] It should be noted that the embodiments of the device for determining the crack propagation capability of sheet metal in this specification and the embodiments of the method for determining the crack propagation capability of sheet metal in this specification are based on the same inventive concept. Therefore, the specific implementation of this embodiment can be referred to the corresponding embodiments of the method for determining the crack propagation capability of sheet metal in the preceding text, and the repeated parts will not be described again.

[0054] Figure 9 A structural block diagram of an electronic device provided for the implementation of this application. For example... Figure 9As shown, the electronic device provided in this application embodiment includes a processor 910 and a memory 920, wherein the memory is used to store instructions executable by the processor; wherein the processor is configured to execute the instructions to achieve, for example... Figure 1 The method for determining the crack propagation capacity of sheet metal is shown.

[0055] In an exemplary embodiment, the electronic device may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0056] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions that can be executed by a processor of a device to perform the described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc. This non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform... Figure 1 The method for determining the crack propagation capacity of sheet metal is shown.

[0057] This application also provides a computer program product, including a computer program, which, when executed by a processor, performs... Figure 1 The method for determining the crack propagation capacity of sheet metal is shown.

[0058] The above description does not provide detailed technical specifications regarding the structure of each layer. However, those skilled in the art should understand that layers and regions of desired shapes can be formed using various technical means. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Additionally, although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be advantageously combined.

[0059] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0060] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for determining the crack propagation capability of a sheet metal, characterized in that, The method includes: During the bulging test on the target sheet, the load-displacement curve of the target sheet is obtained; The line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve is taken as the target line segment. Based on the slope value of the target line segment, the crack propagation resistance index of the target board is determined, and the crack propagation resistance index characterizes the ability of the board product from which the target board originates to resist edge cracking.

2. The method according to claim 1, characterized in that, The edge region of the target board has a gap, and the gap is symmetrical with respect to the center line that bisects the edge region.

3. The method according to claim 1, characterized in that, The bulging test process includes N time periods. During the bulging test on the target sheet, obtaining the load-displacement curve of the target sheet includes: During the bulging test on the target plate, the load applied to the target plate and the displacement of the target plate under the pressure of the load are recorded at each time point. The load-displacement curve of the target plate is obtained based on the load recorded in the N time periods and the displacement corresponding to the load recorded in each time period.

4. The method according to claim 3, characterized in that, The method further includes: If the difference between the load recorded in the current time period and the load recorded in the target time period is greater than a preset threshold, the bulging experiment ends in the current time period, and the load recorded in the target time period is the maximum value among the loads recorded in the N time periods.

5. The method according to claim 1, characterized in that, Determining the crack propagation resistance index of the target plate based on the slope value of the target line segment includes: The slope of the target line segment is calculated using the least squares method. The crack propagation resistance index of the target plate is determined based on the absolute value of the slope value.

6. The method according to claim 5, characterized in that, Determining the crack propagation resistance index of the target plate based on the absolute value of the slope value includes: The crack propagation resistance index of the target plate is calculated using the following formula: Where T is the crack propagation resistance index of the target plate, and G is the absolute value of the slope value.

7. A device for determining the crack propagation capability of a sheet metal, characterized in that, The device includes: The acquisition module is used to acquire the load-displacement curve of the target sheet during the bulging test. The interception module is used to intercept the line segment between the highest point of the load-displacement curve and the end point of the load-displacement curve as the target line segment. The determination module is used to determine the crack propagation resistance index of the target board based on the slope value of the target line segment. The crack propagation resistance index characterizes the ability of the board product from which the target board originates to resist edge cracking.

8. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, When the instructions in the storage medium are executed by the processor of the electronic device, the electronic device is able to perform the method as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, Includes a computer program, which is executed by a processor according to any one of claims 1 to 6.

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