A method and device for simulation analysis of strength of screw connection

Abstract

The present invention provides a strength simulation analysis method and device for screw connection, the method comprising: obtaining a screw connection structure; segmenting an annular contact surface and a screw connection area; setting a tetrahedron unit to replace the screw, so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new screw connection structure; applying surface pressure on the tetrahedron unit, setting boundary conditions according to calculation conditions and surface pressure, and performing strength simulation analysis on the screw connection structure, and outputting strength simulation analysis results. Compared with the prior art, the present invention replaces a screw model with a large amount of data with a tetrahedron unit with a small amount of data, simplifies the screw connection structure, reduces the amount of calculation, ensures the accuracy of the results, and makes the results easy to converge. In addition, by applying surface pressure on the tetrahedron unit, setting boundary conditions according to calculation conditions and surface pressure, the strength simulation analysis results can be closer to the actual working conditions.

Description

Technical Field

[0001] The invention relates to the field of screws, and in particular to a strength simulation analysis method and device for screw connections. Background Art

[0002] Screws are a large category of fasteners, and are widely used in machinery, equipment, vehicles, ships, railway bridges, buildings, structures, tools, instruments, meters and other products. CAE simulation analysis technology is currently the mainstream technology widely used in the strength analysis of various fasteners, but it is mainly used in screw connection structures, and its application to screw connection structures is relatively small. In existing literature, screw connections are mostly modeled using 3D models, and all the details of the screw connections are reflected in the strength simulation analysis. Therefore, the amount of calculation for multi-screw connection structures is large, which can easily lead to non-convergence of the results, and the accuracy of the results is difficult to guarantee. Summary of the invention

[0003] The invention provides a strength simulation analysis method and device for screw connection to solve the technical problem of result convergence.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a strength simulation analysis method of a screw connection, comprising:

[0005] Acquire a first screw connection structure; the first screw connection structure comprises a screw model, a first component and a second component; wherein the screw model is used to connect the first component and the second component;

[0006] An annular contact surface is segmented from the connection between the first component and the screw model, and a screw connection area is segmented from the connection between the second component and the screw model;

[0007] Setting a tetrahedron unit to replace the position of the screw model so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new second screw connection structure;

[0008] Applying surface pressure on the tetrahedral unit, setting boundary conditions according to calculation conditions and the surface pressure, performing strength simulation analysis on the second screw connection structure, and outputting strength simulation analysis results.

[0009] As a preferred solution, the tetrahedron unit is set to replace the position of the screw model, specifically:

[0010] A tetrahedral unit having the same diameter, length and stiffness as those of the screw model is set to replace the position of the screw model.

[0011] As a preferred solution, the boundary conditions are set according to the calculation conditions and the surface pressure, specifically:

[0012] According to the static strength, vibration strength, impact strength and collision strength of the second screw connection structure, combined with the surface pressure, the boundary conditions of the second screw connection structure are set; wherein the boundary conditions include applying fixed constraints, acceleration, velocity and displacement.

[0013] As a preferred embodiment, before applying surface pressure on the tetrahedral unit, it also includes: setting the contact between the first component and the second component to friction contact; and determining the friction coefficient between the first component and the second component based on the material and surface state of the first component and the material and surface state of the second component.

[0014] As a preferred solution, before setting the tetrahedral unit to replace the position of the screw model, the method further includes: converting the screw connection area into a cylindrical hole.

[0015] As a preferred solution, the magnitude of the surface pressure is equal to the pre-tightening force corresponding to the first screw connection structure.

[0016] Correspondingly, an embodiment of the present invention further provides a strength simulation analysis device for screw connection, comprising an acquisition module, a segmentation module, a tetrahedral unit setting module, and an output module; wherein:

[0017] The acquisition module is used to acquire a first screw connection structure; the first screw connection structure includes a screw model, a first component and a second component; wherein the screw model is used to connect the first component and the second component;

[0018] The segmentation module is used to segment an annular contact surface from the connection between the first component and the screw model, and segment a screw connection area from the connection between the second component and the screw model;

[0019] The tetrahedron unit setting module is used to set the position where the tetrahedron unit replaces the screw model, so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new second screw connection structure;

[0020] The output module is used to apply surface pressure on the tetrahedral unit, set boundary conditions according to calculation conditions and the surface pressure, perform strength simulation analysis on the second screw connection structure, and output strength simulation analysis results.

[0021] As a preferred solution, the tetrahedral unit setting module sets the position of the tetrahedral unit to replace the screw model, specifically:

[0022] The tetrahedral unit setting module sets a tetrahedral unit having the same diameter, length and stiffness as the screw model to replace the position of the screw model.

[0023] As a preferred solution, the output module sets boundary conditions according to the calculation conditions and the surface pressure, specifically:

[0024] The output module sets the boundary conditions of the second screw connection structure according to the static strength, vibration strength, impact strength and collision strength of the second screw connection structure in combination with the surface pressure; wherein the boundary conditions include applying fixed constraints, acceleration, velocity and displacement.

[0025] As a preferred embodiment, the strength simulation and analysis device also includes a setting module, which is used to set the contact between the first component and the second component to friction contact before the output module applies surface pressure on the tetrahedral unit; the friction coefficient between the first component and the second component is determined based on the material and surface condition of the first component and the material and surface condition of the second component.

[0026] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0027] The embodiment of the present invention provides a strength simulation analysis method and device for screw connection, the method comprising: obtaining a first screw connection structure; the first screw connection structure comprises a screw model, a first component and a second component; segmenting an annular contact surface and a screw connection area; setting a tetrahedral unit to replace the position of the screw model, so that the tetrahedral unit connects the annular contact surface and the screw connection area to form a new second screw connection structure; applying surface pressure on the tetrahedral unit, setting boundary conditions according to the calculation conditions and the surface pressure, and performing strength simulation analysis on the screw connection structure, and outputting the strength simulation analysis results. Compared with the prior art, the present invention replaces the screw model with a large amount of data with a tetrahedral unit with a small amount of data, simplifies the screw connection structure, reduces the amount of calculation, ensures the accuracy of the results and makes the results easy to converge. In addition, by applying surface pressure on the tetrahedral unit, setting boundary conditions according to the calculation conditions and the surface pressure, the strength simulation analysis results are closer to the actual conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : A flow chart of an embodiment of the present invention provided based on a strength simulation analysis method of a screw connection.

[0029] Figure 2 : is a cross-sectional view of the screw connection structure of an embodiment of the present invention.

[0030] Figure 3 : A structural schematic diagram of an embodiment of the present invention provides a strength simulation and analysis device based on a screw connection. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] Please refer to Figure 1 , a strength simulation analysis method for screw connection provided by an embodiment of the present invention, comprising steps S1 to S4; wherein,

[0034] Step S1, obtaining a first screw connection structure; referring to Figure 2 The first screw connection structure includes a screw model, a first component and a second component; wherein the screw model is used to connect the first component and the second component.

[0035] Step S2, segmenting an annular contact surface from the connection between the first component and the screw model, and segmenting a screw connection area from the connection between the second component and the screw model.

[0036] The screw connection area is the connection area between the screw and the screw hole, and is the main load-bearing area of ​​the screw connection. The annular contact surface is the contact area between the head of the screw model and the first component.

[0037] Between steps S2 and S3 of this embodiment, the strength simulation analysis method further includes: converting the screw connection area into a cylindrical hole to reduce the amount of calculation required in the strength simulation analysis process.

[0038] Step S3, setting a tetrahedron unit to replace the position of the screw model, so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new second screw connection structure.

[0039] Specifically, the tetrahedral unit is set to have the same diameter, length and stiffness as the screw model, so that the tetrahedral unit connection is equivalent to the screw connection. For a multi-screw connection structure, simplifying the screw model with a large amount of data into a tetrahedral unit with a small amount of data can reduce the number of grids, improve calculation efficiency, and have better convergence of simulation analysis.

[0040] Between steps S3 and S4 of this embodiment, the strength simulation analysis method also includes: setting the contact between the first component and the second component to friction contact; determining the friction coefficient between the first component and the second component according to the material and surface condition of the first component and the material and surface condition of the second component; and at the same time, meshing the screw connection structure and refining the base area of ​​the annular contact surface and the cylindrical surface.

[0041] Step S4, applying surface pressure on the tetrahedral unit, setting boundary conditions according to calculation conditions and the surface pressure, performing strength simulation analysis on the second screw connection structure, and outputting strength simulation analysis results.

[0042] In this embodiment, surface pressure is applied on the tetrahedral unit, that is, surface pressure is applied on the annular contact surface, and equal and opposite forces are applied on the screw connection area of ​​the cylindrical hole. These surface pressures or forces are equal to the preload corresponding to the first screw connection structure.

[0043] The boundary conditions of the second screw connection structure are set according to the static strength, vibration strength, impact strength and collision strength of the second screw connection structure in combination with the surface pressure; wherein the boundary conditions include but are not limited to applying fixed constraints, acceleration, velocity and displacement.

[0044] The strength simulation analysis results include but are not limited to stress distribution diagram, strain distribution diagram, acceleration response curve, velocity response curve, displacement response curve and vibration mode diagram.

[0045] Accordingly, refer to Figure 3 The embodiment of the present invention further provides a strength simulation analysis device for screw connection, including an acquisition module 101, a segmentation module 102, a tetrahedral unit setting module 103, and an output module 104; wherein,

[0046] The acquisition module 101 is used to acquire a first screw connection structure; the first screw connection structure includes a screw model, a first component and a second component; wherein the screw model is used to connect the first component and the second component;

[0047] The segmentation module 102 is used to segment an annular contact surface from the connection between the first component and the screw model, and segment a screw connection area from the connection between the second component and the screw model;

[0048] The tetrahedron unit setting module 103 is used to set the position of the tetrahedron unit replacing the screw model, so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new second screw connection structure;

[0049] The output module 104 is used to apply surface pressure on the tetrahedral unit, set boundary conditions according to calculation conditions and the surface pressure, perform strength simulation analysis on the second screw connection structure, and output strength simulation analysis results.

[0050] In this embodiment, the tetrahedral unit setting module 103 sets the position of the tetrahedral unit to replace the screw model, specifically:

[0051] The tetrahedron unit setting module 103 sets a tetrahedron unit having the same diameter, length and stiffness as the screw model to replace the position of the screw model.

[0052] In this embodiment, the output module 104 sets boundary conditions according to the calculation conditions and the surface pressure, specifically:

[0053] The output module 104 sets the boundary conditions of the second screw connection structure according to the static strength, vibration strength, impact strength and collision strength of the second screw connection structure in combination with the surface pressure; wherein the boundary conditions include but are not limited to applying fixed constraints, acceleration, velocity and displacement.

[0054] In this embodiment, the strength simulation and analysis device also includes a setting module, which is used to set the contact between the first component and the second component to friction contact before the output module 104 applies surface pressure on the tetrahedral unit; the friction coefficient between the first component and the second component is determined according to the material and surface state of the first component and the material and surface state of the second component.

[0055] In this embodiment, the strength simulation analysis device further comprises a conversion module, which is used to convert the screw connection area into a cylindrical hole before the tetrahedral unit setting module 103 sets the tetrahedral unit to replace the position of the screw model.

[0056] In this embodiment, the magnitude of the surface pressure is equal to the pre-tightening force corresponding to the first screw connection structure.

[0057] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0058] The embodiment of the present invention provides a strength simulation analysis method and device for screw connection, the method comprising: obtaining a first screw connection structure; the first screw connection structure comprises a screw model, a first component and a second component; segmenting an annular contact surface and a screw connection area; setting a tetrahedral unit to replace the position of the screw model, so that the tetrahedral unit connects the annular contact surface and the screw connection area to form a new second screw connection structure; applying surface pressure on the tetrahedral unit, setting boundary conditions according to the calculation conditions and the surface pressure, and performing strength simulation analysis on the screw connection structure, and outputting the strength simulation analysis results. Compared with the prior art, the present invention replaces the screw model with a large amount of data with a tetrahedral unit with a small amount of data, simplifies the screw connection structure, reduces the amount of calculation, ensures the accuracy of the results and makes the results easy to converge. In addition, by applying surface pressure on the tetrahedral unit, setting boundary conditions according to the calculation conditions and the surface pressure, the strength simulation analysis results are closer to the actual conditions.

[0059] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A strength simulation analysis method for screw connection, characterized in that: include: Acquire a first screw connection structure; the first screw connection structure comprises a screw model, a first component and a second component; wherein the screw model is used to connect the first component and the second component; An annular contact surface is segmented from the connection between the first component and the screw model, and a screw connection area is segmented from the connection between the second component and the screw model; Setting a tetrahedron unit to replace the position of the screw model so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new second screw connection structure; Applying surface pressure on the tetrahedral unit, setting boundary conditions according to calculation conditions and the surface pressure, performing strength simulation analysis on the second screw connection structure, and outputting strength simulation analysis results; The setting of the tetrahedron unit to replace the position of the screw model is specifically as follows: Setting a tetrahedral unit having the same diameter, length and stiffness as the screw model to replace the position of the screw model; Before setting the tetrahedral unit to replace the position of the screw model, the method further includes: converting the screw connection area into a cylindrical hole.

2. A strength simulation analysis method for screw connection according to claim 1, characterized in that: The boundary conditions are set according to the calculation conditions and the surface pressure, specifically: According to the static strength, vibration strength, impact strength and collision strength of the second screw connection structure, combined with the surface pressure, the boundary conditions of the second screw connection structure are set; wherein the boundary conditions include applying fixed constraints, acceleration, velocity and displacement.

3. A strength simulation analysis method for screw connection according to claim 1, characterized in that Before applying surface pressure on the tetrahedral unit, the method further includes: setting the contact between the first component and the second component to be friction contact; and determining the friction coefficient between the first component and the second component according to the material and surface state of the first component and the material and surface state of the second component.

4. A strength simulation analysis method for screw connection according to any one of claims 1 to 3, characterized in that: The magnitude of the surface pressure is equal to the pre-tightening force corresponding to the first screw connection structure.

5. A strength simulation analysis device for screw connection, characterized in that: It includes acquisition module, segmentation module, tetrahedron unit setting module and output module; among them, The acquisition module is used to acquire a first screw connection structure; the first screw connection structure includes a screw model, a first component and a second component; wherein the screw model is used to connect the first component and the second component; The segmentation module is used to segment an annular contact surface from the connection between the first component and the screw model, and segment a screw connection area from the connection between the second component and the screw model; The tetrahedron unit setting module is used to set the position where the tetrahedron unit replaces the screw model, so that the tetrahedron unit connects the annular contact surface and the screw connection area to form a new second screw connection structure; The output module is used to apply surface pressure on the tetrahedral unit, set boundary conditions according to the calculation conditions and the surface pressure, perform strength simulation analysis on the second screw connection structure, and output the strength simulation analysis result; The tetrahedral unit setting module sets the position of the tetrahedral unit to replace the screw model, specifically: The tetrahedral unit setting module sets a tetrahedral unit having the same diameter, length and stiffness as the screw model to replace the position of the screw model; The strength simulation and analysis device further comprises a conversion module, which is used to convert the screw connection area into a cylindrical hole before the tetrahedral unit setting module sets the tetrahedral unit to replace the position of the screw model.

6. A strength simulation analysis device for screw connection according to claim 5, characterized in that: The output module sets boundary conditions according to the calculation conditions and the surface pressure, specifically: The output module sets the boundary conditions of the second screw connection structure according to the static strength, vibration strength, impact strength and collision strength of the second screw connection structure in combination with the surface pressure; wherein the boundary conditions include applying fixed constraints, acceleration, velocity and displacement.

7. A strength simulation analysis device for screw connection according to any one of claims 5 to 6, characterized in that: The strength simulation and analysis device also includes a setting module, which is used to set the contact between the first component and the second component to friction contact before the output module applies surface pressure on the tetrahedral unit; the friction coefficient between the first component and the second component is determined based on the material and surface state of the first component and the material and surface state of the second component.

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