Bolt simplified modeling method and device for modal calculation of solid parts assembly

Abstract

A bolt simplified modeling method and device for modal calculation of transfer of entity parts relate to the field of finite element modeling, assembly and modal simulation of automobile entity parts. In view of the existing problems in the prior art, in the fields of automobile powertrain, chassis development, etc., entity structural parts account for a large proportion, and the simplification of bolts in the finite element modeling and assembly process of multi-components has become the key to modeling. Currently, the publicly available literature has not yet found the problem of the simplified modeling method related to the finite element modeling process of bolts. The present invention provides the following technical solutions: a bolt simplified modeling method, including: finite element modeling of the connected parts; defining the nodes and connections of the bolt head joint surface of the connected parts; finite element modeling of the connecting parts; defining the nodes of the joint surface of the bolt root of the connecting parts and the connection of the middle contact surface; defining the parameters of the bolt rod. It is suitable for finite element modeling, assembly and modal simulation applications of automobile entity parts.

Description

Technical Field

[0001] The invention relates to the field of finite element modeling, assembly and modal simulation of automobile solid parts, and specifically to a bolt simplified modeling method and device for modal calculation of transfer of solid parts. Background Art

[0002] With the development of CAE technology, finite element simulation has been widely used in various fields of automobiles. In the fields of automobile powertrain and chassis development, solid structural components account for a large proportion, and different solid components are mostly connected by bolts. The simplification of bolts in the finite element modeling and assembly process of multi-components has become the key to modeling. The reliability of the modeling method directly affects the accuracy of the subsequent simulation results. Currently, no related methods for simplifying the modeling of bolts in the finite element modeling process have been found in the public literature.

[0003] The existing parts use finite element method, modal modeling and bolt processing methods in the calculation and analysis process. One is to use solid modeling method to establish a solid bolt model, establish contact or common nodes on the joint surface between parts to complete the finite element connection between parts; the bolt and the part are connected by common nodes or contact relationship to simulate the connection between bolts and parts. Although the accuracy of this method meets the calculation requirements, the modeling process is long and the modeling requirements are not fast enough. The second is to use a simple bolt simplification method to simplify the connection relationship between bolts and parts into a rigid body connection. This method has a greater impact on the calculation accuracy. Summary of the invention

[0004] In view of the fact that a simplified modeling method for bolts in the finite element modeling process has not yet been found, the present invention provides the following technical solutions:

[0005] A bolt simplified modeling method, the method comprising:

[0006] In the physical component assembly, the connector near the bolt head is the connected component, and the other connector is the connecting component;

[0007] A connected part modeling step of performing finite element modeling on the connected parts;

[0008] A connected part definition step of defining the bolt head joint surface nodes and connections of the connected parts;

[0009] Connector modeling steps for performing finite element modeling on the connector;

[0010] A connector definition step for defining the joint surface node and the intermediate contact surface connection of the connector bolt root;

[0011] Steps to define the beam element parameters for the bolt shank.

[0012] Furthermore, the steps of modeling the connected parts are specifically as follows:

[0013] Define the bolt radius as r;

[0014] On the joint surface of the connected part and the connecting part, the area within 2.5 times of the bolt radius r is taken as the area definition step of the contact surface area;

[0015] The step of dividing the contact surface area into at least two layers of units.

[0016] Furthermore, the area definition step is specifically as follows: taking an area where the radius r of the bolt is twice as large as the contact surface area between the connected part and the bolt head.

[0017] Furthermore, the steps of defining the connected parts are specifically as follows:

[0018] On the joint surface between the connected part and the bolt head, the intersection of the axis of the bolt and the joint surface is taken as the center point A, and three concentric circles are drawn on the joint surface with the center point A as the center, and the radii of the three circles are r, 1.5r, and 2r respectively;

[0019] At least 10 dividing points are evenly distributed on the circumference of each of the circles;

[0020] Taking the dividing points on the circumference as the connecting points, taking the center point A as the main point, connecting all the connecting points, and the corresponding connecting points on the three circumferences are respectively located on the same straight line passing through the center point A, and are made into rigid units, which are recorded as the bolt head rigid connection units;

[0021] On the joint surface between the connected member and the connecting member, the intersection of the axis of the bolt and the joint surface between the connected member and the connecting member is taken as the center point B. On the joint surface between the connecting member and the connecting member, three concentric circles are made with the center point B as the center. The radii of the three circles are r, 1.25r, and 2.5r respectively.

[0022] At least 10 dividing points are evenly distributed on the circumference of each of the circles;

[0023] Taking the dividing points on the circumference as the connecting slave points and the center point B as the main point, all the connecting slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point B, and are made into rigid units, which are recorded as the rigid connecting units of the connected parts;

[0024] The central point A is defined as node A;

[0025] The central point B is defined as node B.

[0026] Furthermore, the connector modeling steps are specifically as follows:

[0027] include:

[0028] Set the bolt radius to r;

[0029] The step of taking a range with a radius of 2.5r on the joint surface between the connected part and the connecting part as the contact surface area of ​​the connecting part;

[0030] A connector node definition step of dividing the connector contact surface into two or more layers of units;

[0031] The step of defining the bolt joint surface is to divide the threaded surface where the bolt and the connecting piece are joined into three layers of units.

[0032] Furthermore, the connector node definition step is specifically as follows:

[0033] On the joint surface between the connected part and the connecting part, the intersection of the axis of the bolt and the joint surface is taken as the center point C, and three concentric circles are drawn on the joint surface with the center point C as the center, and the radii of the three circles are r, 1.5r, and 2r respectively;

[0034] At least 10 dividing points are evenly distributed on the circumference of each of the circles;

[0035] Taking the dividing points on the circumference as connected slave points and the center point C as the main point, all the connected slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point C, and are made into rigid units, which are recorded as bolt head rigid connection units;

[0036] In the area where the bolt is combined with the connecting piece, on the axis of the bolt, the midpoint of the bolt combination length is taken as the center point D;

[0037] At least three layers of finite elements are divided in the length direction of the thread surface where the bolt and the connecting member are connected, and the contact surface of each layer of finite elements is defined as a unit contact surface. Each of the unit contact surfaces is perpendicular to the axis of the bolt, and at least ten nodes are evenly distributed on the circumference of each of the unit contact surfaces as unit points;

[0038] The central point C is defined as node C;

[0039] The central point D is defined as node D;

[0040] The connection node D is connected to the unit from the point to make a rigid unit, which is recorded as the bolt root rigid unit.

[0041] Furthermore, the connection mode of the combined slave point and the node A is specifically as follows:

[0042] Use 6mm diameter rod unit for connection;

[0043] The connection mode between the connection point and the node B is specifically as follows:

[0044] Use 6mm diameter rod unit for connection.

[0045] Furthermore, the method of connecting the slave point and the node C is specifically as follows:

[0046] Use 45 steel for connection, the elastic modulus is 100 times the actual elastic modulus;

[0047] The unit from point to node D is specifically:

[0048] The connection is made of 45 steel, and the elastic modulus is 100 times the actual elastic modulus.

[0049] Furthermore, the steps of defining the parameters of the bolt rod are specifically as follows:

[0050] The intersection of the axis of the bolt and the joint surface between the bolt head and the connected member is taken as node A, and the midpoint of the axis of the bolt in the contact portion between the bolt and the connected member is taken as node D;

[0051] The node A and the node D are used to connect beam elements with the same bolt material and diameter.

[0052] A bolt simplified modeling device is provided, which is set in a solid-type component assembly, wherein a connecting piece close to the bolt head is a connected piece, and another connecting piece is a connecting piece; the device comprises:

[0053] A connected component modeling module is used to perform finite element modeling on the connected components;

[0054] The connected parts definition module is used to define the bolt head joint surface nodes and connections of the connected parts;

[0055] Connector modeling module, used for finite element modeling of connectors;

[0056] The connector definition module is used to define the connection surface nodes and intermediate contact surface connections of the connector bolt root.

[0057] The bolt parameter definition module is used to define the beam unit parameters of the bolt rod in the tender.

[0058] The present invention is beneficial in that:

[0059] The original intention of the design of the present invention is: in view of the fact that there is no simplified modeling method for bolts in the finite element modeling process, by studying the structural characteristics of bolt connections in the finite element modeling assembly process of automobile solid parts, simplified modeling based on finite element types is performed according to the characteristics of bolt connections. A simplified modeling method is provided for the bolt connection points and related characteristic definitions, the finite element modeling method of the monomer model and the connection point parameter definitions in the finite element modeling assembly process of solid parts, which realizes the simplified modeling of bolts and ensures the accuracy requirements of modeling at the same time.

[0060] The present invention has software applicability and versatility, can effectively shorten the bolt simplified modeling time in the finite element modeling process, and improve simulation efficiency. After the bolt simplified modeling is completed using the solution provided by the present invention, the modal simulation solution result of the component assembly is accurate and reliable, and the maximum difference compared with the test result is no more than 8%, and the engineering applicability is high.

[0061] The modeling method provided by the present invention adopts separate modeling of the components of the whole machine, and the components are connected by bolt stiffness characteristic units. It has wide applicability, is convenient and fast to model, and is easy to define connection relationships.

[0062] It is suitable for finite element modeling, assembly and modal simulation applications of automotive solid parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a flowchart of a simplified bolt modeling method mentioned in the first implementation mode;

[0064] Figure 2 It is a schematic diagram of the connection relationship between the bolt, the connected member and the connecting member mentioned in the first embodiment;

[0065] Figure 3 for Figure 2 Node diagram in ;

[0066] Figure 4 It is a schematic diagram of the finite element model of the connected component mentioned in the second embodiment;

[0067] Figure 5 It is a schematic diagram of the finite element model of the connecting member mentioned in the seventh embodiment;

[0068] Figure 6 This is a schematic diagram of connecting the central point and the nodes mentioned in the fourth implementation mode. DETAILED DESCRIPTION

[0069] In order to describe the advantages and benefits of the present solution in more detail, several implementation methods of the present solution are now described in further detail in conjunction with the accompanying drawings. However, the several implementation methods described below are merely several preferred implementation methods of the present solution and are not intended to limit the present solution.

[0070] Implementation Method 1: Combination Figure 1-3 This embodiment describes a bolt simplified modeling method, which includes:

[0071] In the physical component assembly, the connector near the bolt head is the connected component, and the other connector is the connecting component;

[0072] A connected part modeling step of performing finite element modeling on the connected parts;

[0073] A connected part definition step of defining the bolt head joint surface nodes and connections of the connected parts;

[0074] Connector modeling steps for performing finite element modeling on the connector;

[0075] A connector definition step for defining the joint surface node and the intermediate contact surface connection of the connector bolt root;

[0076] Steps to define the beam element parameters for the bolt shank.

[0077] The benefits of this implementation are that it provides a simplified modeling method for the bolt connection points and related characteristic definitions in the finite element modeling assembly process of solid parts, the finite element modeling method of the single model and the connection point parameter definitions, thereby achieving simplified modeling of bolts and ensuring the accuracy requirements of the modeling.

[0078] Implementation Method 2: Combination Figure 4 This embodiment is described. This embodiment further limits the simplified bolt modeling method provided in the first embodiment. The steps of modeling the connected member are as follows:

[0079] Define the bolt radius as r;

[0080] On the joint surface of the connected part and the connecting part, the area within 2.5 times of the bolt radius r is taken as the area definition step of the contact surface area;

[0081] The step of dividing the contact surface area into at least two layers of units.

[0082] Implementation Method 3: Combination Figure 4 This embodiment is described as further limiting the simplified bolt modeling method provided in the second embodiment. The area definition step is specifically as follows: taking an area where the bolt radius r is twice as large as the contact surface area between the connected part and the bolt head.

[0083] Implementation Method 4: Combination Figure 4 and 6This embodiment is described. This embodiment further defines a bolt simplified modeling method provided in the first embodiment. The steps of defining the connected member are as follows:

[0084] On the joint surface between the connected part and the bolt head, the intersection of the axis of the bolt and the joint surface is taken as the center point A, and three concentric circles are drawn on the joint surface with the center point A as the center, and the radii of the three circles are r, 1.5r, and 2r respectively;

[0085] At least 10 dividing points are evenly distributed on the circumference of each of the circles;

[0086] Taking the dividing points on the circumference as the connecting points, taking the center point A as the main point, connecting all the connecting points, and the corresponding connecting points on the three circumferences are respectively located on the same straight line passing through the center point A, and are made into rigid units, which are recorded as the bolt head rigid connection units;

[0087] On the joint surface between the connected member and the connecting member, the intersection of the axis of the bolt and the joint surface between the connected member and the connecting member is taken as the center point B. On the joint surface between the connecting member and the connecting member, three concentric circles are made with the center point B as the center. The radii of the three circles are r, 1.25r, and 2.5r respectively.

[0088] At least 10 dividing points are evenly distributed on the circumference of each of the circles;

[0089] Taking the dividing points on the circumference as the connecting slave points and the center point B as the main point, all the connecting slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point B, and are made into rigid units, which are recorded as the rigid connecting units of the connected parts;

[0090] The central point A is defined as node A;

[0091] The central point B is defined as node B.

[0092] Implementation Method 5: Combination Figure 4 This embodiment is described. This embodiment is a further limitation of the simplified bolt modeling method provided in the fourth embodiment. The steps of the connecting member modeling are as follows:

[0093] include:

[0094] Set the bolt radius to r;

[0095] The step of taking a range with a radius of 2.5r on the joint surface between the connected part and the connecting part as the contact surface area of ​​the connecting part;

[0096] A connector node definition step of dividing the connector contact surface into two or more layers of units;

[0097] The step of defining the bolt joint surface is to divide the threaded surface where the bolt and the connecting piece are joined into three layers of units.

[0098] Implementation Method 6: Combination Figure 4 This embodiment is described. This embodiment is a further limitation of the simplified bolt modeling method provided in the fourth embodiment. The connection node definition steps are specifically as follows:

[0099] On the joint surface between the connected part and the connecting part, the intersection of the axis of the bolt and the joint surface is taken as the center point C, and three concentric circles are drawn on the joint surface with the center point C as the center, and the radii of the three circles are r, 1.5r, and 2r respectively;

[0100] At least 10 dividing points are evenly distributed on the circumference of each of the circles;

[0101] Taking the dividing points on the circumference as connected slave points and the center point C as the main point, all the connected slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point C, and are made into rigid units, which are recorded as bolt head rigid connection units;

[0102] In the area where the bolt is combined with the connecting piece, on the axis of the bolt, the midpoint of the bolt combination length is taken as the center point D;

[0103] At least three layers of finite elements are divided in the length direction of the thread surface where the bolt and the connecting member are connected, and the contact surface of each layer of finite elements is defined as a unit contact surface. Each of the unit contact surfaces is perpendicular to the axis of the bolt, and at least ten nodes are evenly distributed on the circumference of each of the unit contact surfaces as unit points;

[0104] The central point C is defined as node C;

[0105] The central point D is defined as node D;

[0106] The connection node D is connected to the unit from the point to make a rigid unit, which is recorded as the bolt root rigid unit.

[0107] Specifically, the node C mentioned in this embodiment and the node B mentioned above are two overlapping nodes.

[0108] Implementation Method 7: Combination Figure 5 This embodiment is described. This embodiment is a further limitation of a bolt simplified modeling method provided in the first embodiment. The connection method of the combined slave point and the node A is specifically as follows:

[0109] Use 6mm diameter rod unit for connection;

[0110] The connection mode between the connection point and the node B is specifically as follows:

[0111] Use 6mm diameter rod unit for connection.

[0112] Implementation Method 8: Combination Figure 5 This embodiment is described. This embodiment is a further limitation of the bolt simplified modeling method provided in the seventh embodiment. The method of connecting the slave point and the node C is specifically as follows:

[0113] Use 45 steel for connection, the elastic modulus is 100 times the actual elastic modulus;

[0114] The unit from point to node D is specifically:

[0115] The connection is made of 45 steel, and the elastic modulus is 100 times the actual elastic modulus.

[0116] Implementation Method 9: Combination Figure 2 and 3 This embodiment is described. This embodiment further limits the simplified bolt modeling method provided in the first embodiment. The steps of defining the parameters of the bolt rod are specifically as follows:

[0117] The intersection of the axis of the bolt and the joint surface between the bolt head and the connected member is taken as node A, and the midpoint of the axis of the bolt in the contact portion between the bolt and the connected member is taken as node D;

[0118] The node A and the node D are used to connect beam elements with the same bolt material and diameter.

[0119] The advantages of this embodiment are that the components are connected by bolt stiffness characteristic units, which has wide applicability, is convenient and fast to model, and is easy to define connection relationships.

[0120] Implementation Method 10: Combination Figure 1-3 This embodiment is described. This embodiment provides a simplified bolt modeling device. In the solid component assembly, the connecting piece close to the bolt head is the connected piece, and the other connecting piece is the connecting piece. The device includes:

[0121] A connected component modeling module is used to perform finite element modeling on the connected components;

[0122] The connected parts definition module is used to define the bolt head joint surface nodes and connections of the connected parts;

[0123] Connector modeling module, used for finite element modeling of connectors;

[0124] The connector definition module is used to define the connection surface nodes and intermediate contact surface connections of the connector bolt root;

[0125] The bolt parameter definition module is used to define the beam unit parameters of the bolt rod in the tender.

[0126] The above-described embodiments are only a few preferred embodiments of the solutions provided in this application and are not intended to limit this application. Any changes, equivalent replacements and combinations of the embodiments within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A bolt simplified modeling method, characterized in that: The method comprises: In the physical component assembly, the connector near the bolt head is the connected component, and the other connector is the connecting component; A connected part modeling step of performing finite element modeling on the connected parts; A connected part definition step of defining the bolt head joint surface nodes and connections of the connected parts; The steps of defining the connected parts are specifically as follows: On the joint surface between the connected part and the bolt head, the intersection of the axis of the bolt and the joint surface is taken as the center point A, and three concentric circles are drawn on the joint surface with the center point A as the center, and the radii of the three circles are r, 1.5r, and 2r respectively; Distribute at least 10 division points evenly around the circumference of each circle; Taking the dividing points on the circumference as the connecting points, taking the center point A as the main point, connecting all the connecting points, and the corresponding connecting points on the three circumferences are respectively located on the same straight line passing through the center point A, and are made into rigid units, which are recorded as the bolt head rigid connection units; On the joint surface between the connected member and the connecting member, the intersection of the axis of the bolt and the joint surface between the connected member and the connecting member is taken as the center point B. On the joint surface between the connecting member and the connecting member, three concentric circles are made with the center point B as the center. The radii of the three circles are r, 1.25r, and 2.5r respectively. At least 10 dividing points are evenly distributed on the circumference of each of the circles; Taking the dividing points on the circumference as the connecting slave points and the center point B as the main point, all the connecting slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point B, and are made into rigid units, which are recorded as the rigid connecting units of the connected parts; The central point A is defined as node A; The central point B is defined as node B; Connector modeling steps for performing finite element modeling on the connector; The steps of connecting part modeling are specifically as follows: include: Set the bolt radius to r; The step of taking a range with a radius of 2.5r on the joint surface between the connected part and the connecting part as the contact surface area of ​​the connecting part; A connector node definition step of dividing the connector contact surface into two or more layers of units; A bolt joint surface definition step of dividing the threaded surface where the bolt and the connecting piece are joined into three layers of units; A connector definition step for defining the joint surface node and the intermediate contact surface connection of the connector bolt root; The connector node definition steps are specifically as follows: On the joint surface between the connected part and the connecting part, the intersection of the axis of the bolt and the joint surface is taken as the center point C, and three concentric circles are drawn on the joint surface with the center point C as the center, and the radii of the three circles are r, 1.5r, and 2r respectively; Distribute at least 10 division points evenly around the circumference of each circle; Taking the dividing points on the circumference as connected slave points and the center point C as the main point, all the connected slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point C, and are made into rigid units, which are recorded as bolt head rigid connection units; In the area where the bolt is combined with the connecting piece, on the axis of the bolt, the midpoint of the bolt combination length is taken as the center point D; At least three layers of finite elements are divided in the length direction of the thread surface where the bolt and the connecting member are connected, and the contact surface of each layer of finite elements is defined as a unit contact surface. Each of the unit contact surfaces is perpendicular to the axis of the bolt, and at least ten nodes are evenly distributed on the circumference of each of the unit contact surfaces as unit points; The central point C is defined as node C; The central point D is defined as node D; The connection node D is connected to the unit from the point to make a rigid unit, which is recorded as the bolt root rigid unit; Steps to define the beam element parameters for the bolt shank.

2. A bolt simplified modeling method according to claim 1, characterized in that: The steps of modeling the connected parts are specifically as follows: Define the bolt radius as r; On the joint surface of the connected part and the connecting part, the area within 2.5 times of the bolt radius r is taken as the area definition step of the contact surface area; The step of dividing the contact surface area into at least two layers of units.

3. A bolt simplified modeling method according to claim 2, characterized in that: The area definition step is specifically as follows: taking an area where the radius r of the bolt is twice as large as the contact surface area between the connected part and the bolt head.

4. A bolt simplified modeling method according to claim 1, characterized in that: The connection mode of the combined slave point and node A is specifically as follows: Use 6mm diameter rod unit for connection; The connection mode between the connection point and the node B is specifically as follows: Use 6mm diameter rod unit for connection.

5. A bolt simplified modeling method according to claim 4, characterized in that: The method of connecting the slave point and the node C is specifically as follows: Use 45 steel for connection, the elastic modulus is 100 times the actual elastic modulus; The unit from point to node D is specifically: The connection is made of 45 steel, and the elastic modulus is 100 times the actual elastic modulus.

6. A bolt simplified modeling method according to claim 1, characterized in that: The steps of defining the parameters of the bolt rod are specifically as follows: The intersection of the axis of the bolt and the joint surface between the bolt head and the connected member is taken as node A, and the midpoint of the axis of the bolt in the contact portion between the bolt and the connected member is taken as node D; The node A and the node D are used to connect beam elements with the same bolt material and diameter.

7. A bolt simplified modeling device, characterized in that: In the physical component assembly, the connecting piece close to the bolt head is the connected piece, and the other connecting piece is the connecting piece; the device includes: A connected component modeling module is used to perform finite element modeling on the connected components; The connected parts definition module is used to define the bolt head joint surface nodes and connections of the connected parts; The steps of defining the connected parts are specifically as follows: On the joint surface between the connected part and the bolt head, the intersection of the axis of the bolt and the joint surface is taken as the center point A, and three concentric circles are drawn on the joint surface with the center point A as the center, and the radii of the three circles are r, 1.5r, and 2r respectively; Distribute at least 10 division points evenly around the circumference of each circle; Taking the dividing points on the circumference as the connecting points, taking the center point A as the main point, connecting all the connecting points, and the corresponding connecting points on the three circumferences are respectively located on the same straight line passing through the center point A, and are made into rigid units, which are recorded as the bolt head rigid connection units; On the joint surface between the connected member and the connecting member, the intersection of the axis of the bolt and the joint surface between the connected member and the connecting member is taken as the center point B. On the joint surface between the connecting member and the connecting member, three concentric circles are made with the center point B as the center. The radii of the three circles are r, 1.25r, and 2.5r respectively. At least 10 dividing points are evenly distributed on the circumference of each of the circles; Taking the dividing points on the circumference as the connecting slave points and the center point B as the main point, all the connecting slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point B, and are made into rigid units, which are recorded as the rigid connecting units of the connected parts; The central point A is defined as node A; The central point B is defined as node B; Connector modeling module, used for finite element modeling of connectors; The steps of connecting part modeling are specifically as follows: include: Set the bolt radius to r; The step of taking a range with a radius of 2.5r on the joint surface between the connected part and the connecting part as the contact surface area of ​​the connecting part; A connector node definition step of dividing the connector contact surface into two or more layers of units; A bolt joint surface definition step of dividing the threaded surface where the bolt and the connecting piece are joined into three layers of units; The connector definition module is used to define the connection surface nodes and intermediate contact surface connections of the connector bolt root; The connector node definition steps are specifically as follows: On the joint surface between the connected part and the connecting part, the intersection of the axis of the bolt and the joint surface is taken as the center point C, and three concentric circles are drawn on the joint surface with the center point C as the center, and the radii of the three circles are r, 1.5r, and 2r respectively; Distribute at least 10 division points evenly around the circumference of each circle; Taking the dividing points on the circumference as connected slave points and the center point C as the main point, all the connected slave points are connected, and the corresponding connecting slave points on the three circumferences are respectively located on the same straight line passing through the center point C, and are made into rigid units, which are recorded as bolt head rigid connection units; In the area where the bolt is combined with the connecting piece, on the axis of the bolt, the midpoint of the bolt combination length is taken as the center point D; At least three layers of finite elements are divided in the length direction of the thread surface where the bolt and the connecting member are connected, and the contact surface of each layer of finite elements is defined as a unit contact surface. Each of the unit contact surfaces is perpendicular to the axis of the bolt, and at least ten nodes are evenly distributed on the circumference of each of the unit contact surfaces as unit points; The central point C is defined as node C; The central point D is defined as node D; The connection node D is connected to the unit from the point to make a rigid unit, which is recorded as the bolt root rigid unit; The bolt parameter definition module is used to define the beam unit parameters of the bolt rod in the tender.

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