CN112199797A - Modeling calculation method of bolt structure - Google Patents
Modeling calculation method of bolt structure Download PDFInfo
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- CN112199797A CN112199797A CN202011177212.9A CN202011177212A CN112199797A CN 112199797 A CN112199797 A CN 112199797A CN 202011177212 A CN202011177212 A CN 202011177212A CN 112199797 A CN112199797 A CN 112199797A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
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- 238000010168 coupling process Methods 0.000 claims description 7
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- G—PHYSICS
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- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention relates to a modeling calculation method of a bolt structure, which comprises the steps of building a bolt structure finite element model on the basis of a bolt structure three-dimensional model, and establishing contact on the basis of the bolt structure finite element model; establishing connection on the basis of a finite element model of the bolt structure; and applying bolt pretightening force to the finite element model of the bolt structure, calculating the built model, and obtaining the stress value, the contact force value and the displacement value of the saddle bolt structure. The invention may also take into account: the method has the advantages that the analysis result is more accurate in the aspects of bolt solid modeling, bolt pretightening force, friction force and contact stress between components, model convergence and the like. The method solves the problem of inconvergence of implicit calculation in the analysis of the bolt structure by adding the control parameters, and not only ensures that the model is built comprehensively, but also ensures that the calculation convergence is good. The calculation result is well matched with the test data, so that the design and development time is effectively saved, and the development cost is saved.
Description
Technical Field
The invention belongs to the technical field of modeling, and particularly relates to a modeling calculation method of a bolt structure.
Background
The existing calculation method related to the bolt structure mainly comprises the following steps:
the method comprises the following steps: the bolts do not participate in modeling, the parts are connected in a binding mode, and the bolts are free of contact and bolt pre-tightening force.
The second method comprises the following steps: the bolt is simulated by a beam unit, the diameter of the bolt is specified, parts are connected by the bolt, and the bolt is free of contact and bolt pretightening force.
The two common bolt structure modeling calculation methods can be used under the condition of neglecting bolt pretightening force, but have the following defects:
1. when the influence of the bolt pretightening force on the model is concerned, the stress state after the pretightening force is applied cannot be obtained.
2. When the contact forces between bolted parts are of interest, the magnitude of the contact forces cannot be obtained since both are rigid connections.
3. When the connected components are flexible bodies and friction force exists between the components, the influence of the friction force on the structure cannot be obtained because no contact is arranged.
4. Non-contact or rigid contact patterns can cause uneven force transfer, resulting in distortion of part stress.
Disclosure of Invention
The invention provides a modeling calculation method of a bolt structure, which solves the defects of the prior art.
In order to solve the technical problems, the invention provides a modeling calculation method of a bolt structure, which is characterized by comprising the following specific steps:
s1, building a bolt structure finite element model on the basis of the bolt structure three-dimensional model, specifically:
s1.1, deleting the following structural characteristics in the three-dimensional model of the bolt structure: chamfer angle less than 2mm, fabrication hole with diameter less than 10mm, characteristic line with gap less than 1 mm;
s1.2, dividing a bolt structure three-dimensional model by adopting pentahedron and hexahedron units;
s1.3, obtaining a bolt structure finite element model through the two steps.
S2, establishing contact on the basis of the bolt structure finite element model;
s3, establishing connection on the basis of the bolt structure finite element model;
and S4, applying bolt pretightening force to the bolt structure finite element model.
And S5, calculating the built model, and obtaining the stress value, the contact force value and the displacement value of the saddle bolt structure.
Has the advantages that: the invention may also take into account: the method has the advantages that the analysis result is more accurate in the aspects of bolt solid modeling, bolt pretightening force, friction force and contact stress between components, model convergence and the like. The method solves the problem of inconvergence of implicit calculation in the analysis of the bolt structure by adding the control parameters, and not only ensures that the model is built comprehensively, but also ensures that the calculation convergence is good. The calculation result is well matched with the test data, so that the design and development time is effectively saved, and the development cost is saved.
Drawings
FIG. 1 is a schematic view of a finite element model of a bolt structure after contact and joining are applied.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.
The invention provides a modeling calculation method of a bolt structure, which comprises the following specific steps:
the first step is as follows: a finite element model of a bolt structure is built on the basis of a three-dimensional model of the bolt structure, and the method comprises the following specific steps:
s1.1, the following structural characteristics in the three-dimensional model are required to be deleted in the bolt structure: chamfer angle less than 2mm, fabrication hole with diameter less than 10mm, and characteristic line with gap less than 1 mm.
S1.2, dividing a bolt structure by adopting pentahedral and hexahedral units; the mesh size of the pentahedron and hexahedron unit is set to be 8mm, and the size of the local refined mesh is 3 mm; the minimum grid size of the body unit in the method is controlled to be more than 1 mm.
S1.3, obtaining a bolt structure finite element model through the two steps;
the second step is that: the contact is created on the basis of a finite element model of the bolt structure.
S2.1, applying the interaction function in Abaqus to create contact in a bolt structure finite element model.
S2.2, establishing a contact attribute in the interaction function: the contact friction coefficient is 0.2, the contact type is hard contact, and the friction formula is selected as follows: penalty function, directivity is: isotropy, slip ratio of 0, connection pressure of 0.1, constraint and forced selection: separation is allowed after contact.
S2.3, establishing surface-to-surface contact (surface to surface) in the interaction function, wherein the contact surface mainly comprises the following components: the bolt contacts the washer, the nut contacts the component, and the washer contacts the component. Wherein the parameter setting comprises the following steps: the sliding formula is limited sliding, the discretization method selects the surface to the surface, the adjusting area tolerance is 0.3, and the contact attribute selects the contact attribute created in the previous step.
The third step: and creating connection on the basis of the finite element model of the bolt structure.
S3.1, creating a connection in a bolt structure finite element model by applying the create constraint function in Abaqus.
And S3.2, rigid Coupling (Coupling) connection in the bolt structure finite element model is set by applying the fresh constraint function in the Abaqus, the Coupling type selects kinematic Coupling, and the degrees of freedom in six directions are restrained. A schematic diagram of a finite element model of the bolt structure after contact and joining is shown in fig. 1.
The fourth step: and applying bolt pretightening force to the finite element model of the bolt structure.
S4.1, creating a plane for applying pretightening force at each bolt and a central axis of the bolt
And S4.2, creating a bolt pre-tightening force of the saddle bolt structure by using a create load function in the Abaqus, wherein the action surface of the force is a plane created in the previous step, and the force is calculated according to the grade and the diameter of the bolt.
And S4.3, after the pretightening force is applied, locking the length of the bolt by applying a boltload function in Abaqus.
And S4.4, applying an external force to the bolt model with the applied pretightening force by using the force function in the create load, and calculating the change conditions of stress, strain and contact force of the bolt structure under the action of the external force.
The fifth step: commit computation
And calculating the built model by using an Abaqus program, and obtaining the stress value, the contact force value and the displacement value of the saddle bolt structure.
The model built by the invention can simultaneously consider that: the method has the advantages that the method has five aspects of bolt solid modeling, bolt pretightening force, friction force and contact stress between components and model convergence, so that the analysis result is more consistent with the actual situation. The stress-strain condition of each part can be obtained, and meanwhile, the contact force between the parts and the deformation condition of the bolt after the pretightening force is applied can be calculated.
The model built by the invention can be adopted: the method comprises the steps of bolt solid modeling, bolt pretightening force application, contact between components and calculation of contact stress of a bolt structure.
The method solves the problem of inconvergence of implicit calculation in the analysis of the bolt structure by adding the control parameters, and not only ensures that the model is built comprehensively, but also ensures that the calculation convergence is good.
The calculation result is well matched with the test data, so that the design and development time is effectively saved, and the development cost is saved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A modeling calculation method of a bolt structure is characterized by comprising the following specific steps:
s1, building a bolt structure finite element model on the basis of the bolt structure three-dimensional model, specifically:
s1.1, deleting the following structural characteristics in the three-dimensional model of the bolt structure: chamfer angle less than 2mm, fabrication hole with diameter less than 10mm, characteristic line with gap less than 1 mm;
s1.2, dividing a bolt structure three-dimensional model by adopting pentahedron and hexahedron units;
s1.3, obtaining a bolt structure finite element model through the two steps.
S2, establishing contact on the basis of the bolt structure finite element model;
s3, establishing connection on the basis of the bolt structure finite element model;
s4, applying bolt pretightening force to the bolt structure finite element model;
and S5, calculating the built model, and obtaining the stress value, the contact force value and the displacement value of the saddle bolt structure.
2. The modeling calculation method of the bolt structure according to claim 1, wherein in S1.2, the mesh size of the pentahedral and hexahedral unit cells is set to 8mm, and the local refined mesh size is 3 mm.
3. The modeling calculation method of a bolt structure according to claim 2, wherein in S1.2, the minimum mesh size is controlled to be 1mm or more.
4. The modeling calculation method of the bolt structure according to claim 2, wherein S2 specifically includes the following steps:
s2.1, establishing contact in a finite element model of a bolt structure;
s2.2, establishing contact attributes;
s2.3, establishing surface-to-surface contact.
5. The modeling calculation method of the bolt structure according to claim 4, wherein in S2.2, the contact property is: the contact friction coefficient is 0.2, the contact type is hard contact, and the friction formula is selected as follows: penalty function, directivity is: isotropy, slip ratio of 0, connection pressure of 0.1, constraint and forced selection: separation is allowed after contact.
6. The modeling calculation method of the bolt structure according to claim 4, wherein in S2.3, the contact surfaces mainly include: the bolt contacts the washer, the nut contacts the component, and the washer contacts the component.
7. The modeling calculation method of the bolt structure according to claim 6, wherein the parameters in S2.3 are set as: the sliding formula is limited sliding, the discretization method selects the surface to the surface, the adjusting area tolerance is 0.3, and the contact attribute selects the contact attribute created in the previous step.
8. The modeling calculation method of the bolt structure according to claim 6, wherein S3 specifically includes the following steps:
s3.1, establishing connection in a bolt structure finite element model;
and S3.2, setting rigid coupling connection in the bolt structure finite element model.
9. The modeling calculation method of the bolt structure according to claim 8, wherein in S3.2, the coupling type selects kinematic coupling, and six-directional degrees of freedom are constrained.
10. The modeling calculation method of the bolt structure according to claim 6, wherein S4 specifically includes the following steps:
s4.1, creating a plane for applying pretightening force and a central axis of each bolt;
s4.2, creating a bolt pretightening force of the saddle bolt structure, wherein the action surface of a force is a plane created in the previous step, and the magnitude of the force is calculated according to the grade and the diameter of the bolt;
s4.3, locking the length of the bolt after applying the pretightening force;
and S4.4, applying an external force in the bolt model with the applied pretightening force, and calculating the change conditions of stress, strain and contact force of the bolt structure under the action of the external force.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011177212.9A CN112199797A (en) | 2020-10-28 | 2020-10-28 | Modeling calculation method of bolt structure |
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| CN202011177212.9A CN112199797A (en) | 2020-10-28 | 2020-10-28 | Modeling calculation method of bolt structure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353907A (en) * | 2013-06-17 | 2013-10-16 | 沈阳华创风能有限公司 | Calculating method of ultimate strength checking of connection of flange and bolt |
| JP2016090324A (en) * | 2014-10-31 | 2016-05-23 | 国立大学法人名古屋大学 | Contact state analysis method, contact state analysis apparatus, and program |
| CN106294941A (en) * | 2016-07-29 | 2017-01-04 | 东南大学 | A kind of bolted-on attachment considering pretightning force closes face stiffness simulation method |
| CN108170942A (en) * | 2017-12-26 | 2018-06-15 | 北京无线电测量研究所 | A kind of finite element modeling system and method for bolt fastening structure |
| CN108460237A (en) * | 2018-04-08 | 2018-08-28 | 大连理工大学 | A kind of bolt fastening structure loosening finite element simulation method considering the practical tangential force state of screw thread |
| CN109543360A (en) * | 2019-01-18 | 2019-03-29 | 中国科学院金属研究所 | A kind of finite element method for evaluating iron tower of power transmission line bolt strength |
| CN110991118A (en) * | 2019-12-30 | 2020-04-10 | 杭州电子科技大学 | Method for designing pre-tightening force of bolt of overhead pipeline based on finite element analysis |
-
2020
- 2020-10-28 CN CN202011177212.9A patent/CN112199797A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353907A (en) * | 2013-06-17 | 2013-10-16 | 沈阳华创风能有限公司 | Calculating method of ultimate strength checking of connection of flange and bolt |
| JP2016090324A (en) * | 2014-10-31 | 2016-05-23 | 国立大学法人名古屋大学 | Contact state analysis method, contact state analysis apparatus, and program |
| CN106294941A (en) * | 2016-07-29 | 2017-01-04 | 东南大学 | A kind of bolted-on attachment considering pretightning force closes face stiffness simulation method |
| CN108170942A (en) * | 2017-12-26 | 2018-06-15 | 北京无线电测量研究所 | A kind of finite element modeling system and method for bolt fastening structure |
| CN108460237A (en) * | 2018-04-08 | 2018-08-28 | 大连理工大学 | A kind of bolt fastening structure loosening finite element simulation method considering the practical tangential force state of screw thread |
| CN109543360A (en) * | 2019-01-18 | 2019-03-29 | 中国科学院金属研究所 | A kind of finite element method for evaluating iron tower of power transmission line bolt strength |
| CN110991118A (en) * | 2019-12-30 | 2020-04-10 | 杭州电子科技大学 | Method for designing pre-tightening force of bolt of overhead pipeline based on finite element analysis |
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