Method for checking strength of nut inner hexagonal hole and related equipment

Abstract

The application provides a nut inner hexagonal hole strength checking method and device, electronic equipment and storage medium. The method comprises the following steps: constructing a three-dimensional model of the nut, and performing mesh division on the model; acquiring a first target mesh located in the nut inner hexagonal hole region, and applying a load to the first target mesh; calculating a first stress in the first target mesh according to the load; calculating a second stress in the first target mesh according to the yield strength and tensile strength of the nut; and in response to determining that the first stress is less than a predetermined multiple of the second stress, determining that the strength of the nut in the first target mesh region is qualified. The application can check the strength of the nut inner hexagonal hole by constructing a model for mesh division, comparing the size of the first stress in the mesh with the size of the second stress of a predetermined multiple, and checking the strength of the nut hexagonal hole to prevent damage to the nut inner hexagonal hole.

Description

Technical Field

[0001] This application relates to the field of parts verification, and in particular to a method, apparatus, electronic device and storage medium for verifying the strength of the internal hexagonal hole of a nut. Background Technology

[0002] Currently, large-scale generating units frequently use nuts with internal hexagonal sockets. These nuts are often tightened using a torque method, which requires applying torque through the internal hexagonal socket to the nut. This torque then applies preload to the bolt. Therefore, if the internal hexagonal socket of the nut is damaged due to the applied torque, it could further damage the generating unit. Thus, the strength of the internal hexagonal socket in the nut is particularly important.

[0003] Currently, the selection and verification of nuts only considers bolt strength combined with nut thickness, without verifying the strength of the internal hexagonal hole. Therefore, how to verify the internal hexagonal hole of the nut is a problem that needs to be solved in this field. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a method, apparatus, electronic device and storage medium for strength verification of the internal hexagonal hole of a nut to solve or partially solve the above-mentioned technical problems.

[0005] As one aspect of this application, a method for strength verification of the internal hexagonal hole of a nut is provided, the method comprising:

[0006] Construct a three-dimensional model of the nut and mesh the model;

[0007] Obtain a first target mesh located in the hexagonal hole region inside the nut, and apply a load to the first target mesh;

[0008] Calculate the first stress within the first target grid based on the load;

[0009] Calculate the second stress within the first target grid based on the yield strength and tensile strength of the nut;

[0010] In response to determining that the first stress is less than a predetermined multiple of the second stress, the strength of the nut within the first target grid region is determined to be qualified.

[0011] Optionally, applying a load to the first target mesh includes:

[0012] A local thin film stress, a secondary thin film stress, and a bending stress are simultaneously applied to the first target mesh.

[0013] Optionally, calculating the first stress within the first target mesh based on the load includes:

[0014] A three-dimensional coordinate system including the x-axis, y-axis, and z-axis is constructed in the model;

[0015] The primary local membrane stress, secondary membrane stress, and bending stress are decomposed along the coordinate axes in the coordinate system.

[0016] The resultant force of the primary local membrane stress, the secondary membrane stress, and the bending stress along the x-axis is σ1, the resultant force along the y-axis is σ2, and the resultant force along the z-axis is σ3.

[0017] The first stress is calculated by substituting σ1, σ2, and σ3 into the yield function of the yield criterion.

[0018] Optionally, the step of substituting σ1, σ2, and σ3 into the yield function of the yield criterion to calculate the first stress includes:

[0019] Substitute σ1, σ2, and σ3 into the yield function of the Mises yield criterion to calculate the first stress σ;

[0020] The yield function includes:

[0021]

[0022] Optionally, calculating the second stress within the first target grid based on the yield strength and tensile strength of the nut includes:

[0023] Based on the material of the nut, obtain the yield strength and tensile strength of the nut;

[0024] If the 2 / 3 times yield strength is less than the 1 / 3 times tensile strength, then the 2 / 3 times yield strength is determined to be the second stress;

[0025] If the 2 / 3 times yield strength is greater than the 1 / 3 times tensile strength, then the 1 / 3 times tensile strength is determined to be the second stress.

[0026] Optionally, the predetermined multiple can range from 2 to 4.

[0027] Optionally, the method further includes:

[0028] Obtain a second target mesh located in the hexagonal hole region inside the nut, apply a load to the second target mesh, and calculate a third stress within the second target mesh based on the load;

[0029] Calculate the fourth stress within the second target grid based on the yield strength and tensile strength of the nut;

[0030] If the third stress within the second target grid is less than a predetermined multiple of the fourth stress, then the strength of the nut within the region of the second target grid is determined to be qualified.

[0031] In response to determining that the strength of the nut is qualified within the area of ​​all meshes in the three-dimensional model of the internal hexagonal hole of the nut, the strength of the internal hexagonal hole of the nut is determined to be qualified.

[0032] Based on the same inventive concept, a third aspect of this application provides a strength verification device for the internal hexagonal hole of a nut, comprising:

[0033] The construction module is configured to: construct a three-dimensional model of the nut and mesh the model;

[0034] Obtain a first target mesh located in the hexagonal hole region inside the nut, and apply a load to the first target mesh;

[0035] The calculation module is configured to: calculate the first stress within the first target mesh based on the load;

[0036] Calculate the second stress within the first target grid based on the yield strength and tensile strength of the nut;

[0037] In response to determining that the first stress is less than a predetermined multiple of the second stress, the strength of the nut within the first target grid region is determined to be qualified.

[0038] Based on the same inventive concept, a third aspect of this application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the strength verification method described in the first aspect when executing the program.

[0039] Based on the same inventive concept, a fourth aspect of this application provides a non-transitory computer-readable storage medium, characterized in that the non-transitory computer-readable storage medium stores computer instructions, which are used to cause the computer to execute the strength verification method described in the first aspect above.

[0040] As can be seen from the above, the strength verification method, apparatus, electronic device, and storage medium for the internal hexagonal hole of a nut provided in this application can achieve the verification of the internal hexagonal hole of a nut. This application first proposes constructing a three-dimensional model of the nut and meshing the model, which facilitates the subsequent selection of the internal hexagonal hole region. Secondly, this application selects a first mesh located at the internal hexagonal hole and applies a load to it, calculating a first stress based on the load. This application simulates the possible stress on the internal hexagonal hole of the nut in actual applications by applying a load to the mesh, and compares the first stress with a second stress based on the nut's yield strength and tensile strength at a predetermined multiple, thereby determining whether the strength of the nut in the region within the first target mesh is qualified. Therefore, this application fills the current gap in the strength verification of the internal hexagonal hole of a nut, enabling the strength verification of the internal hexagonal hole region of a nut. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1A This is a schematic flowchart of a method for strength verification of the internal hexagonal hole of a nut provided in an embodiment of this application.

[0043] Figure 1B This is a schematic flowchart of a method for calculating the first stress provided in an embodiment of this application.

[0044] Figure 1C This is a schematic diagram of a coordinate system construction provided in an embodiment of this application.

[0045] Figure 1D This is a schematic flowchart of a method for calculating a second stress provided in an embodiment of this application.

[0046] Figure 1E This is a schematic flowchart of another method for strength verification of the internal hexagonal hole of a nut provided in an embodiment of this application.

[0047] Figure 2 This is a schematic diagram of a strength verification device for the internal hexagonal hole of a nut provided in an embodiment of this application.

[0048] Figure 3 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0050] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0051] Currently, hexagonal socket nuts are widely used in large-scale power units. Taking pumped storage units as an example, one of their applications, pumped storage units offer rapid response and flexible operation, providing multiple functions in the power system, including peak shaving, valley filling, frequency regulation, phase regulation, emergency backup, and black start, playing a crucial role in the safe, stable, and economical operation of the power grid. Furthermore, the large-scale development of random and intermittent new energy sources necessitates pumped storage power stations for absorption and storage. This has created excellent development opportunities for pumped storage power stations. In recent years, the construction of pumped storage power stations has accelerated, with the total number of pumped storage power stations under research, design, construction, and operation, as well as the total number of generating units, continuously expanding.

[0052] Hex socket nuts are mainly used in the top cover of pumped storage units. Due to the high head and high speed of pumped storage units, the top cover bears a large dynamic load of water pressure during operation. Especially during the transition process, the top cover is subjected to a large impact of water hammer pressure waves. If the top cover bolts are not tightened, the nuts may break, causing the top cover to be lifted, which may lead to damage to the unit or even serious accidents such as flooding of the plant. This could cause huge losses of life and property. Therefore, it is necessary to select appropriate nuts.

[0053] Currently, there is no technical method for strength verification of the internal hexagonal hole of a nut. Therefore, this application creatively proposes a method, apparatus, electronic device, and storage medium for strength verification of the internal hexagonal hole of a nut, which verifies the internal hexagonal hole of the nut by comparing a first stress of the internal hexagonal hole with a predetermined multiple of a second stress in a three-dimensional model, thus filling a technical gap in this field.

[0054] Figure 1A The diagram shows a flow chart of a method for verifying the strength of the internal hexagonal hole of a nut provided in an embodiment of this application.

[0055] In some embodiments, such as Figure 1A As shown, the strength verification method for the internal hexagonal hole of the nut includes the following steps:

[0056] S101: Construct a three-dimensional model of the nut and mesh the model;

[0057] S102: Obtain the first target mesh located in the hexagonal hole region of the nut, and apply a load to the first target mesh;

[0058] S103: Calculate the first stress within the first target grid based on the load;

[0059] S104: Calculate the second stress within the first target grid based on the yield strength and tensile strength of the nut;

[0060] S105: In response to determining that the first stress is less than a predetermined multiple of the second stress, the strength of the nut in the region within the first target grid is determined to be qualified.

[0061] In some embodiments, when constructing the 3D model of the nut in step S101, some finite element analysis algorithms can be used, such as ANSYS. Furthermore, when constructing the 3D model and meshing it, the mesh size can be manually set, and the edge length of the mesh can be set according to requirements; this will not be elaborated further here.

[0062] In some embodiments, when performing step S102, applying a load to the first target mesh includes the following steps:

[0063] A local thin film stress, a secondary thin film stress, and a bending stress are simultaneously applied to the first target mesh.

[0064] Since the internal hexagonal hole of the nut has a volume, this application abstracts the internal hexagonal hole of the nut as a "container" to complete the strength verification of this "container".

[0065] In general, conventional design approaches the assessment of container strength based on the first strength theory. This theory primarily checks the maximum principal stress, considering it the primary cause of material failure. When the stress exceeds the material's yield strength, regardless of whether the plastic deformation occurs in a localized or overall region, the container will lose its effective load-bearing capacity, i.e., it "fails." This demonstrates that conventional design judgments are too arbitrary, failing to distinguish between the overall and localized aspects, and therefore may not be applicable in practical applications.

[0066] The analytical design addresses this issue by checking local stress and mean stress using different standards, relaxing the standard for local stress. It incorporates not only elastic failure criteria but also elastoplastic and plastic failure criteria, allowing for small-scale localized plastic zones within the structure. By checking different locations separately, the structure can bear loads more fully, improving the safety factor to some extent, rather than relying on a large safety factor based on experience, while still ensuring structural safety.

[0067] Based on the above, this application utilizes the fourth strength theory: as long as the shape change energy density at a point within a component reaches the material's limit value, it is considered that the material at that point undergoes plastic yielding. Based on this theory, a strength verification method for the hexagonal hole inside the nut is designed to prevent the component from undergoing plastic collapse.

[0068] Generally, the stresses experienced by a structure can be classified into the following categories:

[0069] Total primary membrane stress Pm: The stress that is prevalent in the structure and does not lead to load redistribution when the structure yields.

[0070] Local primary membrane stress (PL): Membrane stress caused by pressure or other forms of mechanical load, and related to excessive deformation resulting from the transfer of load to other parts of the container. According to the definitions of overall membrane stress and local membrane stress, their main difference is that the former exists in the overall area of ​​the component, while the latter exists in a local area. Therefore, the membrane stress in the overall structural area is called Pm, while the membrane stress in the local structural area is called PL. Furthermore, the relationship between the two is that wherever Pm is defined, there is no PL, and wherever PL is defined, there is no Pm.

[0071] Bending stress Pb: The bending stress caused by the load required to satisfy the law of equilibrium between internal and external forces and moments.

[0072] Secondary membrane stress Q: Normal or shear stress caused by the mutual constraints between adjacent components or the constraints on the structure itself. Secondary stress is self-limiting.

[0073] Peak stress F: A nonlinear stress increment distinct from primary and secondary stresses, resulting from local discontinuities or localized thermal stresses. Peak stress does not cause any noticeable deformation; it is only detrimental when fatigue cracking or brittle fracture is considered.

[0074] The stress classification methods that have gradually developed due to engineering applications do not need to, nor is it possible to, make overly detailed classifications of stress types. Therefore, in finite element analysis (FEM), a torque is first applied to the internal hexagonal hole of the nut. The FEM then calculates the comprehensive stress distribution, and the stress distribution cloud map displays the included stress categories. The stresses include three types: primary film local stress (PL), secondary film stress (Q), and bending stress (Pb). These three stresses are then applied to the first target mesh.

[0075] Figure 1B A schematic flowchart of a method for calculating a first stress provided in an embodiment of this application is shown.

[0076] Figure 1C This illustration shows a schematic diagram of a coordinate system construction provided by an embodiment of this application.

[0077] As shown in 1B, in some embodiments, when performing step S103: calculating the first stress within the first target grid based on the load, the following is included:

[0078] S1031: Construct a three-dimensional coordinate system including the x-axis, y-axis and z-axis in the model;

[0079] S1032: Decompose the primary local membrane stress PL, secondary membrane stress Q, and bending stress Pb along the coordinate axes in the coordinate system.

[0080] S1033: The resultant force of the primary local membrane stress PL, the secondary membrane stress Q, and the bending stress Pb in the x-axis direction is σ1, the resultant force in the y-axis direction is σ2, and the resultant force in the z-axis direction is σ3.

[0081] S1034: Substitute σ1, σ2, and σ3 into the yield function of the yield criterion to calculate the first stress.

[0082] In everyday applications, such as Figure 1C As shown in the figure, area B indicates the internal hexagonal hole of the nut. The circumferential stress in the internal hexagonal hole B is often considered the primary local membrane stress PL, and the radial stress is considered the secondary membrane stress Q. The bending stress Pb can be set according to the different load directions of the nut in the actual process, which will not be elaborated here. Furthermore, any coordinate origin can be selected when constructing the coordinate system, such as... Figure 1C This demonstrates one possible way to construct a coordinate system. It's conceivable that the purpose of constructing the coordinate system is to decompose the three forces mentioned above, then calculate the resultant force of different forces along the same coordinate axis, and finally substitute this resultant force into the yield function of the yield criterion to calculate the first stress.

[0083] Furthermore, there is more than one yield function for yield criteria; common yield criteria include the following:

[0084] (1) Tresca's yield criterion: Proposed by the French engineer H. Tresca in 1864, it means that when the shear stress in a stressed object (particle) reaches its maximum, the object yields. The yield function is...

[0085]

[0086] Where σ s For uniaxial tensile yield stress, yielding will occur as long as one of the three expressions above is satisfied. In other words, in the Tresca yield criterion, only the difference between the two stresses needs to be calculated.

[0087] (2) Von Mises' yield criterion: Proposed by German mechanician Von Mises in 1913 from a purely mathematical perspective, it states that an object (particle) enters a plastic state when the equivalent stress reaches the yield value. The yield function is...

[0088]

[0089] Where σ is the uniaxial tensile yield stress.

[0090] (3) Drucker-Prager Yield Criterion: Proposed by Drucker and Prager in 1952, the Drucker-Prager yield criterion modifies the Von Mises yield criterion, considering the effect of hydrostatic pressure on yielding but not the effect of temperature changes. Therefore, this material is suitable for granular materials such as concrete, rock, and soil. The yield function is...

[0091]

[0092] I1=σ1+σ2+σ3

[0093]

[0094] (4) The Mohr-Coulomb (MC) yield criterion: This criterion can be understood as follows: when a point in a material undergoes slip (shear) on a plane N, the shear stress τn acting on that plane must overcome not only the inherent cohesion C of the material, but also the frictional force generated by the normal stress σn acting on that plane (note that tensile stress is defined as positive here, while compressive stress is positive in soil mechanics). The yield function is...

[0095]

[0096] I1=σ1+σ2+σ3

[0097]

[0098] θ∈[-30°,30°]

[0099] It is conceivable that the above yield criteria are merely exemplary, and the yield criteria are not limited to these four. In practical applications, this application can select different yield functions for different yield criteria. Since the Mises yield criterion is more applicable to the properties of metals, as an optional embodiment, this application selects to calculate the first stress σ by substituting the aforementioned σ1, σ2, and σ3 into the yield function of the Mises yield criterion when selecting the yield criterion.

[0100] The yield function includes:

[0101]

[0102] It is understandable that the stress calculated using the Mises yield function is the Mises equivalent stress. The Mises equivalent stress is calculated based on the fourth strength theory and is an equivalent stress. Furthermore, the Mises equivalent stress contour lines can be plotted to represent the stress distribution within the model. These contour lines clearly describe the variation of a result throughout the model, allowing analysts to quickly identify the most dangerous areas within the model.

[0103] Figure 1D A schematic flowchart of a method for calculating a second stress provided in an embodiment of this application is shown.

[0104] In some embodiments, such as Figure 1D As shown, in step S104: calculating the second stress within the first target grid based on the yield strength and tensile strength of the nut, the following steps are included:

[0105] S1041: Based on the material of the nut, obtain the yield strength and tensile strength of the nut;

[0106] S1042: If the 2 / 3 times yield strength is less than the 1 / 3 times tensile strength, then the 2 / 3 times yield strength is determined to be the second stress;

[0107] S1043: If the 2 / 3 times yield strength is greater than the 1 / 3 times tensile strength, then the 1 / 3 times tensile strength is determined to be the second stress.

[0108] Yield strength is the critical stress value at which a material yields, while tensile strength is the maximum stress value that a material can withstand before breaking.

[0109] Currently, material deformation under stress is classified into elastic deformation (the material can recover its original shape after the external force is removed) and plastic deformation (the material cannot recover its original shape after the external force is removed, and its shape changes). When the stress exceeds the elastic limit, deformation increases rapidly. At this point, in addition to elastic deformation, some plastic deformation also occurs. When the stress reaches a critical value, the plastic strain increases sharply, and a small plateau appears in the plastic strain curve; this phenomenon is called yielding. When the material yields to a certain extent, its resistance to deformation increases again due to the rearrangement of internal grains. At this point, although deformation develops rapidly, it can only increase with increasing stress until the stress reaches its maximum value. After this, the material's resistance to deformation decreases significantly, and large plastic deformation occurs at the weakest point. The cross-section of the part at this point will shrink rapidly, resulting in necking, until fracture. Therefore, when checking the strength of a nut, both its yield strength and tensile strength must be considered. Furthermore, since this application divides the stress in the inner hexagonal hole B of the nut into three types in the aforementioned process, and divides them into forces in different directions such as circumferential and radial, and since the direction of bending stress is uncertain, it is necessary to assign a multiple of 2 / 3 of the yield strength and a multiple of 1 / 3 of the tensile strength when selecting the second stress, so as to ensure that the strength of the nut is checked to the greatest extent.

[0110] It is conceivable that, currently, once the material of the nut is known, its yield strength and tensile strength can be directly obtained. Furthermore, this application selects the smaller value between 2 / 3 times the yield strength and 1 / 3 times the tensile strength as the second stress, which is the allowable stress of the nut. This allows for more precise verification of the nut, ensuring that it can withstand greater loads during use and further improving the standard for nut quality.

[0111] In some embodiments, when performing step 105: determining the magnitude of the first stress and a predetermined multiple of the second stress, the predetermined multiple ranges from 2 to 4. As an optional embodiment, the comparison can be made between the first stress and 3 times the second stress; if the first stress is less than 3 times the second stress, the nut's strength within the first target grid area is deemed acceptable. Since this application classifies the stress on the nut's internal hexagonal hole into three types in the above steps, 3 can be selected when choosing the predetermined multiple.

[0112] Figure 1E This paper illustrates a schematic flowchart of another method for strength verification of the internal hexagonal hole of a nut provided in an embodiment of this application.

[0113] In some embodiments, such as Figure 1E As shown, after the strength check of the nut within the first target grid is completed, the following steps will be performed:

[0114] S106: Obtain the second target mesh located in the hexagonal hole region of the nut, apply a load to the second target mesh and calculate the third stress in the second target mesh based on the load;

[0115] S107: Calculate the fourth stress within the second target grid based on the yield strength and tensile strength of the nut;

[0116] S108: If the third stress within the second target grid is less than a predetermined multiple of the fourth stress, then the strength of the nut within the region of the second target grid is determined to be qualified;

[0117] S109: In response to determining that the strength of the nut is qualified within the area of ​​all meshes in the three-dimensional model of the internal hexagonal hole of the nut, the internal hexagonal hole strength of the nut is determined to be qualified.

[0118] It is conceivable that when applying loads to the second target mesh, one can also choose to apply three types of stress: primary local membrane stress, secondary membrane stress, and bending stress. These three stresses are then decomposed on different coordinate axes to calculate the resultant force in each coordinate axis direction. Finally, the three resultant forces are substituted into the Mises yield function to calculate the third stress.

[0119] It can be inferred that when calculating the fourth stress within the second target mesh, since the second and first target meshes are located in the same nut, they are made of the same material, meaning their tensile strength and yield strength are also the same. Therefore, the smaller of 2 / 3 times the yield strength and 1 / 3 times the tensile strength can be chosen as the fourth stress. Finally, when comparing the third stress with the predetermined multiple of the fourth stress, 3 can also be chosen as the predetermined multiple. Similarly, the above method can be repeatedly used to verify whether the strength of the portion of the nut containing all meshes within the hexagonal hole region of the nut is acceptable. If all meshes are acceptable, then the strength of the hexagonal hole within the nut is deemed acceptable.

[0120] As can be seen from the above method, this application conducted a detailed stress analysis on the internal hexagonal hole B of the nut. Based on the results, it utilized the elastic stress analysis method of the American Society of Mechanical Engineers (ASME) for preventing plastic collapse in design. This method involves classifying the stresses calculated through elastic analysis into various categories and limiting them to a conservatively determined allowable stress to prevent plastic collapse. This method enables the strength verification of the internal hexagonal hole of the nut.

[0121] It should be noted that the method in this embodiment can be executed by a single device, such as a computer or server. The method can also be applied in a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the method in this embodiment, and the multiple devices will interact with each other to complete the method described.

[0122] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0123] Figure 2 A schematic diagram of a strength verification device for the internal hexagonal hole of a nut provided in an embodiment of this application is shown.

[0124] In some embodiments, such as Figure 2 As shown, the strength verification device for the internal hexagonal hole of the nut includes:

[0125] The construction module 100 is configured to: construct a three-dimensional model of the nut and mesh the model;

[0126] Obtain a first target mesh located in the hexagonal hole region inside the nut, and apply a load to the first target mesh;

[0127] The calculation module 200 is configured to: calculate the first stress within the first target mesh based on the load;

[0128] Calculate the second stress within the first target grid based on the yield strength and tensile strength of the nut;

[0129] In response to determining that the first stress is less than a predetermined multiple of the second stress, the strength of the nut within the first target grid region is determined to be qualified.

[0130] The construction module 100 can simultaneously apply a local thin film stress, a secondary thin film stress, and a bending stress when applying a load to the first target mesh.

[0131] When calculating the first stress, the calculation module 200 may take the following steps:

[0132] A three-dimensional coordinate system including the x-axis, y-axis, and z-axis is constructed in the model;

[0133] The primary local membrane stress, secondary membrane stress, and bending stress are decomposed along the coordinate axes in the coordinate system.

[0134] The resultant force of the primary local membrane stress, the secondary membrane stress, and the bending stress along the x-axis is σ1, the resultant force along the y-axis is σ2, and the resultant force along the z-axis is σ3.

[0135] Substitute σ1, σ2, and σ3 into the yield equation of the Mises yield criterion to calculate the first stress σ;

[0136] The yield equation includes:

[0137]

[0138] When the calculation module calculates the second stress, it may take the following steps:

[0139] Based on the nut material, obtain the yield strength and tensile strength of the nut;

[0140] If the 2 / 3 times yield strength is less than the 1 / 3 times tensile strength, then the 2 / 3 times yield strength is determined to be the second stress;

[0141] If the 2 / 3 times yield strength is greater than the 1 / 3 times tensile strength, then the 1 / 3 times tensile strength is determined to be the second stress.

[0142] Furthermore, the value of the predetermined multiple can range from 2 to 4.

[0143] It is conceivable that this device could be a tool capable of implementing finite element analysis algorithms, and could be applied to verifying the inner hole of nuts in different devices. The device in the above embodiments is used to implement the corresponding methods in the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated further here.

[0144] Based on the same technical concept, corresponding to the methods of any of the above embodiments, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the strength verification method described in any of the above embodiments.

[0145] Figure 3 A schematic diagram of a more specific electronic device hardware structure provided in an embodiment of this application is shown.

[0146] like Figure 3As shown, the device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected within the device via the bus 1050.

[0147] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0148] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store operating devices and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0149] The input / output interface 1030 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components within the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touchscreens, microphones, various sensors, etc., while output devices may include displays, speakers, vibrators, indicator lights, etc.

[0150] The communication interface 1040 is used to connect a communication module (not shown in the figure) to enable communication between this device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0151] Bus 1050 includes a pathway for transmitting information between various components of the device, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0152] It should be noted that although the above-described device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the embodiments of this specification, and not necessarily all the components shown in the figures.

[0153] The electronic devices described above are used to implement the corresponding strength verification methods in any of the foregoing embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0154] Based on the same technical concept, corresponding to the methods of any of the above embodiments, this application also provides a non-transitory computer-readable storage medium that stores computer instructions for causing the computer to execute the strength verification method as described in any of the above embodiments.

[0155] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0156] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the strength verification method as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0157] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0158] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of the implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0159] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0160] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A method of strength check of a socket hole of a nut, characterized by, The method comprises the following steps: constructing a three-dimensional model of the nut and meshing the model; obtaining a first target mesh located in the region of the internal hexagonal hole of the nut, and applying a load to the first target mesh; calculating a first stress in the first target mesh according to the load; calculating a second stress in the first target mesh according to the yield strength and tensile strength of the nut, comprising: obtaining the yield strength and tensile strength of the nut according to the material of the nut; if 2 / 3 times the yield strength is less than 1 / 3 times the tensile strength, determining the 2 / 3 times the yield strength as the second stress; if the 2 / 3 times the yield strength is greater than the 1 / 3 times the tensile strength, determining the 1 / 3 times the tensile strength as the second stress; wherein the yield strength is the critical stress value of material yield, and the tensile strength is the maximum stress value of material before breaking; in response to determining that the first stress is less than a predetermined multiple of the second stress, determining that the strength of the nut in the region of the first target mesh is qualified.

2. The strength check method of claim 1, wherein, The method further comprises the following steps: applying a local film stress, a secondary film stress and a bending stress to the first target mesh simultaneously.

3. The strength check method of claim 2, wherein, The method further comprises the following steps: constructing a three-dimensional coordinate system comprising an x-axis, a y-axis and a z-axis in the model; decomposing the local film stress, the secondary film stress and the bending stress along the coordinate axes in the coordinate system; wherein the resultant force of the local film stress, the secondary film stress and the bending stress along the x-axis direction is σ1, the resultant force along the y-axis direction is σ2, and the resultant force along the z-axis direction is σ3; calculating the first stress by inputting σ1, σ2 and σ3 into a yield function of a yield criterion.

4. The strength check method of claim 3, wherein The method further comprises the following steps: calculating the first stress σ by inputting σ1, σ2 and σ3 into a yield function of a Mises yield criterion; the yield function comprises: 。 5. The strength check method of claim 1, wherein, the predetermined multiple is in the range of 2 to 4.

6. The strength check method of claim 1, wherein, The method further comprises the following steps: obtaining a second target mesh located in the region of the internal hexagonal hole of the nut, applying a load to the second target mesh and calculating a third stress in the second target mesh according to the load; calculating a fourth stress in the second target mesh according to the yield strength and tensile strength of the nut; if the third stress in the second target mesh is less than a predetermined multiple of the fourth stress, determining that the strength of the nut in the region of the second target mesh is qualified; in response to determining that the strength of the nut in all regions of all meshes in the three-dimensional model of the internal hexagonal hole of the nut is qualified, determining that the strength of the internal hexagonal hole of the nut is qualified.

7. A strength verification device for the internal hexagonal hole of a nut, characterized in that, The method comprises the following steps: a construction module configured to construct a three-dimensional model of the nut and mesh the model; obtaining a first target mesh located in the region of the internal hexagonal hole of the nut, and applying a load to the first target mesh; a calculation module configured to calculate a first stress in the first target mesh according to the load; According to the yield strength and tensile strength of the nut, the second stress in the first target grid is calculated, including: according to the material of the nut, the yield strength and tensile strength of the nut are obtained; if 2 / 3 times of the yield strength is less than 1 / 3 times of the tensile strength, the 2 / 3 times of the yield strength is determined as the second stress; if the 2 / 3 times of the yield strength is greater than the 1 / 3 times of the tensile strength, the 1 / 3 times of the tensile strength is determined as the second stress; wherein the yield strength is the critical stress value of material yield, and the tensile strength is the maximum stress value of material before breaking; In response to determining that the first stress is less than a predetermined multiple of the second stress, it is determined that the strength of the nut in the first target grid area is qualified.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the strength checking method of any one of claims 1-6.

9. A non-transitory computer-readable storage medium, comprising: The non-transitory computer readable storage medium stores computer instructions for causing the computer to execute the strength checking method of any one of claims 1-6.

Images