Rotating body residual stress uniformity evaluation method and electronic device

Abstract

The application discloses a kind of rotary body residual stress uniformity evaluation method and electronic equipment, it is related to residual stress evaluation technical field, method includes: obtaining the position dataset of rotary body;Obtain the stress dataset of rotary body;According to position dataset and stress dataset, using polar coordinate form, rotary body residual stress distribution polygon schematic diagram is drawn;According to the rotary body residual stress distribution polygon schematic diagram, using roundness mode, the uniformity of rotary body residual stress is calculated.The application according to the stress value and angle of each stress measuring point is represented in polar coordinate system, to accurately describe the distribution of rotary body residual stress;And innovatively using roundness evaluation method, the stress value and angle of each stress measuring point are combined to carry out rotary body residual stress uniformity evaluation, ensure the accuracy and objectivity of rotary body residual stress uniformity evaluation.

Description

Technical Field

[0001] This invention relates to the field of residual stress evaluation technology, and in particular to a method and electronic device for evaluating the uniformity of residual stress in a rotating body. Background Technology

[0002] Since the disc, disc shaft, and ring components are all rotating parts with axisymmetric characteristics, and radar charts can display multiple data features, the residual stress data of the test points on each characteristic test surface of the disc, disc shaft, and ring components are plotted as radar charts.

[0003] Radar charts can intuitively and vividly represent the residual stress values ​​on various characteristic test surfaces of rotating parts. However, in actual testing, damage to the workpiece may occur during the test, often resulting in test failures or abnormal measurement data. Therefore, retesting is necessary, which means retesting near the measurement point (away from the circumferential position of the measurement point).

[0004] However, radar charts cannot represent the angular deviations at each measuring point. Furthermore, existing methods for evaluating the uniformity of residual stress rarely consider the above-mentioned situations. When evaluating residual stress, these methods often assume that the measuring points are uniformly distributed, meaning that the included angles between all measuring points are the same. Therefore, when a measuring point fails to be tested and a new measuring point needs to be selected nearby, the evaluation results do not consider the influence introduced by the deviation of the measuring point position. Summary of the Invention

[0005] The purpose of this invention is to provide a method and electronic device for evaluating the uniformity of residual stress in a rotating body. The method combines the stress values ​​and angles of each stress measuring point to evaluate the uniformity of residual stress in the rotating body, thereby achieving the goal of evaluation accuracy and objectivity.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] In a first aspect, the present invention provides a method for evaluating the uniformity of residual stress in a rotating body, the method comprising:

[0008] Obtain the position dataset of the rotating body; the position dataset includes angle data of the positions of each stress measuring point on the rotating body;

[0009] Obtain a stress dataset of the rotating body; the stress dataset includes stress data at various stress measurement points located on the rotating body.

[0010] Based on the location dataset and stress dataset, a polygonal diagram of the residual stress distribution of the rotating body is drawn in polar coordinates.

[0011] Based on the polygonal diagram of the residual stress distribution of the rotating body, the uniformity of the residual stress of the rotating body is calculated using the roundness method.

[0012] Optionally, before performing the step of drawing a polygonal diagram of the residual stress distribution of the body of revolution in polar coordinates based on the location dataset and stress dataset, the following steps are also included:

[0013] When a stress measurement point on the rotating body fails to be tested, the angle data of the failed stress measurement point is replaced with the angle data of the new stress measurement point, and the stress data of the failed stress measurement point is replaced with the stress data of the new stress measurement point, resulting in an updated position dataset and stress dataset. The new stress measurement point is a stress measurement point that is reselected near the original stress measurement point that failed to be tested.

[0014] Optionally, obtaining the location dataset of each stress measurement point of the rotating body specifically includes:

[0015] Based on the external dimensional parameters of the rotating body, the position data of each stress measuring point are determined; each stress measuring point is located on the circumference of the same circle, the center of the circle coincides with the rotation axis of the rotating body, and the plane containing the circumference of the circle is perpendicular to the rotation axis of the rotating body.

[0016] Select any stress measuring point as the first stress measuring point, and sequentially determine the second, third, ..., Nth stress measuring points along the same rotation direction, where N is the number of stress measuring points. Set the angle of the first stress measuring point's location to 0°, and define the angle of the i-th stress measuring point's location as the angle between the i-th stress measuring point's location and the first stress measuring point's location. <i≤N。

[0017] Optionally, obtaining the stress dataset at each stress measurement point of the rotating body specifically includes:

[0018] The stress data of each stress measurement point is acquired by triangular strain gauges; wherein the triangular strain gauges are set at the positions of each stress measurement point.

[0019] Optionally, in the polygonal diagram of the residual stress distribution of the rotating body, each stress measuring point is represented as...

[0020] in, Let α be the stress value at the i-th stress measurement point; i Let be the angle at the location of the i-th stress measurement point.

[0021] Optionally, based on the polygonal diagram of the residual stress distribution of the rotating body, the uniformity of the residual stress of the rotating body is calculated using a roundness method, specifically including:

[0022] The uniformity of residual stress P in a rotating body is calculated using the following formula:

[0023]

[0024] Where N is the number of stress measurement points, ∑σ θ R is the sum of stress values ​​at all measuring points, and R is the radius of the largest inscribed circle of the polygonal region in the polar coordinate system; the polygonal region is the area enclosed by all stress measuring points; the stress includes circumferential stress and radial stress.

[0025] Optionally, in the polygonal schematic diagram of the residual stress distribution of the body of revolution, the polygonal region is represented by an inequality; the inequality is:

[0026] A i rcosθ+B i rsinθ+C i ≥0, i=1,2,3,…,n;

[0027] Where n is the number of sides of the polygonal region, and the number of sides of the polygonal region is the same as the number of stress measuring points; A i B i C i are the coefficients of the equation of the line containing the i-th side of the polygon, and r and θ are the polar radius and polar angle of the coordinate point within the polygon region, respectively.

[0028] Optionally, the calculation process for the largest inscribed circle radius of the polygonal region is as follows:

[0029] In the schematic diagram of the residual stress distribution polygon of the rotating body, when the polygon region is a convex polygon, the distance from the origin of the polar coordinates to the straight line containing each side of the convex polygon is calculated, and the minimum distance is determined as the largest inscribed circle radius R of the polygon region.

[0030] Optionally, the calculation process for the largest inscribed circle radius of the polygonal region is as follows:

[0031] In the polygonal diagram of residual stress distribution of the rotating body, when the polygonal region is a concave polygon, the distance from the origin of the polar coordinates to the intersection of the straight lines containing each side of the concave polygon is calculated, and the minimum distance is determined as the largest inscribed circle radius R of the polygonal region.

[0032] In a second aspect, the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a program, and when the program is executed by the processor, the processor performs the steps of the method for evaluating the uniformity of residual stress in a rotating body as described in the first aspect.

[0033] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0034] This invention provides a method and electronic device for evaluating the uniformity of residual stress in a rotating body. The method includes: acquiring a position dataset of the rotating body; acquiring a stress dataset of the rotating body; drawing a polygonal diagram of the residual stress distribution of the rotating body in polar coordinates based on the position dataset and the stress dataset; and calculating the uniformity of residual stress in the rotating body using a roundness method based on the polygonal diagram of the residual stress distribution. Compared to the prior art that uses radar charts to represent the distribution of residual stress at each stress measuring point, which cannot represent the angular deviation of each stress measuring point and cannot take into account the angular deviation between stress measuring points when evaluating the uniformity of residual stress, resulting in inaccurate evaluation results, this invention represents each stress measuring point in a polar coordinate system based on the stress value and angle of each stress measuring point to accurately describe the distribution of residual stress in the rotating body; and innovatively adopts a roundness evaluation method, combining the stress value and angle of each stress measuring point to evaluate the uniformity of residual stress in the rotating body, ensuring the accuracy and objectivity of the evaluation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart of the method for evaluating the uniformity of residual stress in a rotating body according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the polar coordinate distribution representation of residual stress provided in an embodiment of the present invention;

[0038] Figure 3 Drawings of annular components with different cross-sectional shapes provided in embodiments of the present invention;

[0039] Figure 4 A cross-sectional shape diagram of a disc-shaped component provided in an embodiment of the present invention;

[0040] Figure 5 This is a cross-sectional shape diagram of a disc-shaped component provided in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the residual stress distribution polygon provided in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] To more accurately describe the distribution of residual stress at measuring points, this invention proposes a polar coordinate representation method. A systematic method for characterizing and evaluating the residual stress and its uniformity in discs, disc shafts, and rings is established. This method can conveniently plot the residual stress distribution at any circumferential angle (i.e., the measuring points are not uniformly distributed along the circumference) and can calculate accurate evaluation results for the uniformity of residual stress.

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Example 1

[0047] like Figure 1 As shown, this embodiment provides a method for evaluating the uniformity of residual stress in a rotating body, the method comprising:

[0048] Step 100: Obtain the position dataset of the rotating body; the position dataset includes the angle data of the positions of each stress measuring point on the rotating body;

[0049] Step 200: Obtain the stress dataset of the rotating body; the stress dataset includes stress data at various stress measurement points located on the rotating body;

[0050] Step 300: Based on the location dataset and stress dataset, draw a polygonal diagram of the residual stress distribution of the rotating body in polar coordinates;

[0051] Step 400: Based on the polygonal diagram of the residual stress distribution of the rotating body, calculate the uniformity of the residual stress of the rotating body using the roundness method.

[0052] In some embodiments, the lack of systematic and quantitative analysis and evaluation methods for the residual stress and distribution uniformity of rotating components such as discs, disc shafts, and rings has led to the problem of insufficient data support and basis for residual stress control in these components. The evaluation method for the uniformity of residual stress in rotating bodies may further include: acquiring characteristic parameters of the rotating body and determining the location of measuring points; setting drilling parameters; acquiring the stress state near the measuring points; and evaluating the uniformity of the overall residual stress of the component. This allows for a comprehensive and thorough analysis of the residual stress, providing an evaluation basis for the study of residual stress control and elimination in discs, disc shafts, and rings.

[0053] In some embodiments, prior to performing step 300, the method further includes:

[0054] When a stress measurement point on the rotating body fails to be tested, the angle data of the failed stress measurement point is replaced with the angle data of the new stress measurement point, and the stress data of the failed stress measurement point is replaced with the stress data of the new stress measurement point, resulting in an updated position dataset and stress dataset. The new stress measurement point is a stress measurement point that is reselected near the original stress measurement point that failed to be tested.

[0055] In some embodiments, step 100 specifically includes:

[0056] Step 101: Determine the position data of each stress measuring point according to the external dimensional parameters of the rotating body; each stress measuring point is located on the circumference of the same circle, the center of the circle coincides with the rotation axis of the rotating body, and the plane containing the circumference of the circle is perpendicular to the rotation axis of the rotating body.

[0057] Step 102: Select any stress measuring point as the first stress measuring point, and sequentially determine the second stress measuring point, the third stress measuring point, ..., the Nth stress measuring point along the same rotation direction, where N is the number of stress measuring points. Set the angle of the location of the first stress measuring point to 0°, and set the angle of the location of the i-th stress measuring point to the angle between the location of the i-th stress measuring point and the location of the first stress measuring point. <i≤N。

[0058] In some embodiments, it is necessary to determine the location of the initial stress measurement point according to different types of rotating bodies, which contain different characteristic parameters:

[0059] (1) Structural features of ring-shaped components

[0060] See Figure 2 Based on their shape characteristics, typical ring-shaped products can be divided into five types: (a) rectangular, (b) C-shaped, (c) L-shaped, (d) I-shaped, (e) F-shaped, and (f) T-shaped. The characteristic parameters of each type of ring-shaped product are summarized in Table 1-1.

[0061] Table 1-1 Characteristic parameters of ring-shaped components with different cross-sectional shapes

[0062]

[0063] Where D represents diameter, H represents height, and L represents width.

[0064] (2) Structural characteristic parameters of disk-type components

[0065] See Figure 3 ,against Figure 3 Table 1-2 shows the typical characteristic parameters of the disc-type components shown.

[0066] Table 1-2 Characteristic parameters of disk-type components

[0067]

[0068] Where D1 and D2 represent the outer diameter of the web, D3 and D4 represent the diameter of the hub, D5 represents the outer edge diameter, and H represents the height of each part.

[0069] (3) Structural characteristic parameters of shaft components

[0070] See Figure 4 ,against Figure 4 Table 1-3 provides typical characteristic parameters for the shaft-type components shown.

[0071] Table 1-3 Characteristic parameters of disc shaft components

[0072]

[0073] Where D represents the diameter of each part of the shaft / disc, H represents the height of each part of the shaft / disc, and L represents the width of each part of the shaft / disc. Additionally, for shaft-type components, those with a larger disc are generally called "disc shafts," while those with a smaller disc are simply called "shafts."

[0074] In some embodiments, step 200 specifically includes:

[0075] Step 201: Obtain stress data from each stress measurement point collected by the triangular strain gauge; wherein, the triangular strain gauge is set at the location of each stress measurement point.

[0076] In some embodiments, step 201 specifically includes:

[0077] Clean and grind the stress measurement points. Attach triangular strain gauges to the stress measurement points and set the drilling parameters, including the drill diameter, drill depth, radius of the hole relative to the center of the rotating body, and angle. The drill diameter should be between 1.9 mm and 2.1 mm, and the drill depth should be greater than 1.2 times the drill diameter. Measurement points on the same end face (or toroidal surface) should have the same radius relative to the center of the rotating body. The angle should be equally divided according to the number of stress measurement points; for example, if a total of 8 stress measurement points are set, each measurement point should be divided into 45° sections, and each stress measurement point should be located at 1 / 2 of the corresponding test plane.

[0078] Drill a hole at the center of the triangular strain gauge and record the stress value at each measuring point.

[0079] In some embodiments, such as Figure 5 As shown in the polygonal diagram illustrating the residual stress distribution of the rotating body, each stress measuring point is represented as follows: in, Let α be the stress value at the i-th stress measurement point; i Let be the angle at the location of the i-th stress measurement point.

[0080] That is, based on the recorded radial stress, circumferential stress (or ring stress), and angle of each stress measuring point, a polar coordinate diagram of the residual stress distribution is drawn.

[0081] The polar coordinate system is a two-dimensional coordinate system in which any position can be represented by an angle and a distance relative to the origin and the pole. Using polar coordinates, the distribution of residual stress at the measuring point can be accurately described.

[0082] Taking eight measuring points on a circle as an example, when the positions of the eight points on the circle are not uniformly distributed, the polar coordinate method can be used to express their relative positional relationship and stress value. The steps are as follows:

[0083] First, stress measuring point No. 1 is determined as the point with a 0-degree angle, and its position can be represented by polar coordinates. This represents the circumferential stress value at point 1; the radial stress is represented similarly.

[0084] Based on the relative positional relationship between stress measuring point No. 2 and stress measuring point No. 1, their positions can be represented by polar coordinates. Let O1 represent the circumferential stress value at stress measuring point 2, and α1 be the angle between stress measuring point 1 (O1) and stress measuring point 2 (O2). Then, the position of stress measuring point 3 can be represented in polar coordinates as follows: The above method can be used to determine the location and stress value of eight stress measurement points on the circumference. Connecting these stress measurement points with straight lines will yield a polygon of the residual stress distribution (see [link]). Figure 5 ).

[0085] See Figure 6 In some embodiments, step 400 specifically includes:

[0086] The uniformity of residual stress P in a rotating body is calculated using the following formula:

[0087]

[0088] Where N is the number of stress measurement points, ∑σ θ P represents the sum of stress values ​​at all measuring points, where R is the radius of the largest inscribed circle of the polygonal region in the polar coordinate system; the polygonal region is the area enclosed by all stress measuring points; the stress includes circumferential stress and radial stress. A smaller P value indicates a more uniform distribution of residual stress.

[0089] For example, when there are 8 stress measurement points, It is the sum (absolute value) of the circumferential stress values ​​at 8 points.

[0090] In some embodiments, in the polygonal schematic diagram of the residual stress distribution of the body of revolution, the polygonal region is represented by an inequality; the inequality is:

[0091] A i rcosθ+B i rsinθ+C i ≥0, i=1,2,3,…,n, (2);

[0092] Where n is the number of sides of the polygonal region, and the number of sides of the polygonal region is the same as the number of stress measuring points; A i B i C i are the coefficients of the equation of the line containing the i-th side of the polygon, and r and θ are the polar radius and polar angle of the coordinate point within the polygon region, respectively.

[0093] The above inequality can be expressed in a rectangular coordinate system as follows:

[0094] A i x+B i y+C i ≥0, i=1,2,3,…,n,(3);

[0095] Where x and y are the x-coordinates and y-coordinates of a point within the polygonal region, respectively.

[0096] In some embodiments, the calculation process for the largest inscribed circle radius of the polygonal region is as follows:

[0097] In the schematic diagram of the residual stress distribution polygon of the rotating body, when the polygon region is a convex polygon, the distance from the origin of the polar coordinates to the straight line containing each side of the convex polygon is calculated, and the minimum distance is determined as the largest inscribed circle radius R of the polygon region.

[0098] The method for determining whether a residual stress distribution polygon is a convex or concave polygon is as follows: if any interior angle of the polygon is less than 180°, it is a convex polygon; if at least one interior angle is greater than 180°, it is a concave polygon.

[0099] In some embodiments, the calculation process for the largest inscribed circle radius of the polygonal region further includes:

[0100] In the polygonal diagram of residual stress distribution of the rotating body, when the polygonal region is a concave polygon, the distance from the origin of the polar coordinates to the intersection of the straight lines containing each side of the concave polygon is calculated, and the minimum distance is determined as the largest inscribed circle radius R of the polygonal region.

[0101] Example 2

[0102] This embodiment provides an electronic device, including a memory and a processor. The memory stores a program, and when the program is executed by the processor, the processor performs the steps of the method for evaluating the uniformity of residual stress in a rotating body as described in the above embodiment.

[0103] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of an electronic device provided in this application. For example... Figure 7 As shown, the electronic device 1000 may include a processor 1001, a network interface 1004, and a memory 1005. Furthermore, the electronic device 1000 may also include a user interface 1003 and at least one communication bus 1002. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be high-speed RAM or non-volatile memory, such as at least one disk drive. Optionally, the memory 1005 may also be at least one storage device located remotely from the aforementioned processor 1001. Figure 7 As shown, the memory 1005, which is an electronic storage medium, may include an operating system, a network communication module, a user interface module, and a device control application.

[0104] exist Figure 7In the electronic device 1000 shown, the network interface 1004 provides network communication functions; the user interface 1003 is mainly used to provide an input interface for users; and the processor 1001 can be used to call the device control application stored in the memory 1005 to implement the method for evaluating the uniformity of residual stress of a rotating body as described in the above embodiment, which will not be described in detail here.

[0105] In summary, the present invention has the following advantages:

[0106] This invention represents each stress measuring point in a polar coordinate system based on the stress value and angle of each stress measuring point, which can accurately describe the distribution of residual stress in a rotating body; and innovatively adopts a roundness evaluation method, combining the stress value and angle of each stress measuring point to evaluate the uniformity of residual stress in a rotating body, ensuring the accuracy and objectivity of the evaluation of the uniformity of residual stress in a rotating body.

[0107] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0108] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for evaluating the uniformity of residual stress in a rotating body, characterized in that, The method includes: Obtain the position dataset of the rotating body; the position dataset includes angle data of the positions of each stress measuring point on the rotating body; Obtain a stress dataset of the rotating body; the stress dataset includes stress data at various stress measurement points located on the rotating body. Based on the location dataset and stress dataset, a polygonal diagram of the residual stress distribution of the rotating body is drawn in polar coordinates. Based on the polygonal diagram of the residual stress distribution of the rotating body, the uniformity of the residual stress of the rotating body is calculated using the roundness method.

2. The method for evaluating the uniformity of residual stress in a rotating body according to claim 1, characterized in that, Before the step of drawing a polygonal diagram of the residual stress distribution of the rotating body in polar coordinates based on the location and stress datasets, the following steps are also included: When a stress measurement point on the rotating body fails to be tested, the angle data of the failed stress measurement point is replaced with the angle data of the new stress measurement point, and the stress data of the failed stress measurement point is replaced with the stress data of the new stress measurement point, resulting in an updated position dataset and stress dataset. The new stress measurement point is a stress measurement point that is reselected near the original stress measurement point that failed to be tested.

3. The method for evaluating the uniformity of residual stress in a rotating body according to claim 1, characterized in that, The acquisition of the location dataset of each stress measurement point of the rotating body specifically includes: Based on the external dimensional parameters of the rotating body, the position data of each stress measuring point are determined; each stress measuring point is located on the circumference of the same circle, the center of the circle coincides with the rotation axis of the rotating body, and the plane containing the circumference of the circle is perpendicular to the rotation axis of the rotating body. Select any stress measuring point as the first stress measuring point, and sequentially determine the second, third, ..., Nth stress measuring points along the same rotation direction, where N is the number of stress measuring points. Set the angle of the first stress measuring point's location to 0°, and define the angle of the i-th stress measuring point's location as the angle between the i-th stress measuring point's location and the first stress measuring point's location. <i≤N。 4. The method for evaluating the uniformity of residual stress in a rotating body according to claim 1, characterized in that, The specific steps for obtaining the stress dataset at each stress measurement point of the rotating body include: The stress data of each stress measurement point is acquired by triangular strain gauges; wherein the triangular strain gauges are set at the positions of each stress measurement point.

5. The method for evaluating the uniformity of residual stress in a rotating body according to claim 1, characterized in that, In the polygonal diagram of the residual stress distribution of the rotating body, each stress measuring point is represented as follows: in, Let α be the stress value at the i-th stress measurement point; i Let be the angle at the location of the i-th stress measurement point.

6. The method for evaluating the uniformity of residual stress in a rotating body according to claim 1, characterized in that, Based on the polygonal diagram of the residual stress distribution of the rotating body, the uniformity of the residual stress of the rotating body is calculated using the roundness method, specifically including: The uniformity of residual stress P in a rotating body is calculated using the following formula: Where N is the number of stress measurement points, ∑σ θ R is the sum of stress values ​​at all measuring points, and R is the radius of the largest inscribed circle of the polygonal region in the polar coordinate system; the polygonal region is the area enclosed by all stress measuring points; the stress includes circumferential stress and radial stress.

7. The method for evaluating the uniformity of residual stress in a rotating body according to claim 6, characterized in that, In the polygonal diagram of the residual stress distribution of the rotating body, the polygonal region is represented by an inequality; the inequality is: A i rcosθ+B i rsinθ+C i ≥0,i=1,2,3,…,n; Where n is the number of sides of the polygonal region, and the number of sides of the polygonal region is the same as the number of stress measuring points; A i B i C i are the coefficients of the equation of the line containing the i-th side of the polygon, and r and θ are the polar radius and polar angle of the coordinate point within the polygon region, respectively.

8. The method for evaluating the uniformity of residual stress in a rotating body according to claim 6, characterized in that, The calculation process for the largest inscribed circle radius of the polygonal region is as follows: In the schematic diagram of the residual stress distribution polygon of the rotating body, when the polygon region is a convex polygon, the distance from the origin of the polar coordinates to the straight line containing each side of the convex polygon is calculated, and the minimum distance is determined as the largest inscribed circle radius R of the polygon region.

9. The method for evaluating the uniformity of residual stress in a rotating body according to claim 6, characterized in that, The calculation process for the largest inscribed circle radius of the polygonal region is as follows: In the polygonal diagram of residual stress distribution of the rotating body, when the polygonal region is a concave polygon, the distance from the origin of the polar coordinates to the intersection of the straight lines containing each side of the concave polygon is calculated, and the minimum distance is determined as the largest inscribed circle radius R of the polygonal region.

10. An electronic device, characterized in that, The device includes a memory and a processor, the memory storing a program that, when executed by the processor, causes the processor to perform the steps of the method for evaluating the uniformity of residual stress in a rotating body as described in any one of claims 1-9.

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