Bolt entity grid modeling and loading method

A bolt and mesh technology, applied in the field of bolt solid mesh modeling and loading, can solve the problems of error-prone, time-consuming, tedious and repetitive operation process, and achieve the effect of standardizing the operation process and saving labor costs.

Active Publication Date: 2022-01-04
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described in the prior art, a modeling method of a solid bolt mesh: use pentahedral mesh and hexahedral mesh to divide to obtain a finite element model of a bolt, and calculate the bolt pretension force according to the bolt grade and diameter , and manually apply the load, manually establish the load action surface, action point and manually associate them, the operation process is cumbersome and repetitive, time-consuming and error-prone

Method used

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  • Bolt entity grid modeling and loading method
  • Bolt entity grid modeling and loading method
  • Bolt entity grid modeling and loading method

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specific Embodiment approach

[0065] In order to clearly and completely describe the technical solution of the present invention and its specific working process, in conjunction with the accompanying drawings, the specific implementation of the present invention is as follows:

[0066] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

[0067] In the present i...

Embodiment 1

[0070] A bolt solid mesh modeling and loading method, comprising the following steps:

[0071] Such as Figure 1-3 As shown, step 1 is to establish the finite element model of the transmission housing assembly, the gear shaft and the bearing used on the transmission housing assembly in the Hypermesh software, and then use the TCL language to create all the gear shafts and bearings used on the transmission housing assembly. The finite element model of the bolt;

[0072] Step 2, create constraint points - rigid connection elements of some nodes of the transmission case, and apply constraints;

[0073] Step 3, apply TCL language to automatically distinguish bolt models and apply bolt pretightening force:

[0074] 1. Using TCL language to automatically create bolt preload loading points;

[0075] 2. Using TCL language to automatically apply bolt pretightening force;

[0076] 3. Using TCL language to automatically create the bolt pre-tightening surface;

[0077] 4. Apply TCL l...

Embodiment 2

[0125] The first step, as attached figure 1 , to establish the assembly finite element model of the transmission case:

[0126] 1) Establish finite element models such as transmission front housing 1 and transmission rear housing 2 in Hypermesh software.

[0127] 2) Establish the finite element model of the transmission housing assembly bolt 3 in the Hypermesh software:

[0128] ① Group all bolts by diameter and screw length;

[0129] ② Taking a bolt with a diameter of 8mm as an example, take out the geometric model of any bolt, and use a plane perpendicular to its screw to cut the upper and lower parts of the closed body at the place where the thickness of the screw is smaller than the thickness of the connected part-4. The geometry of the upper and lower parts is divided by tetrahedral mesh, and the two parts share all the nodes of the cutting surface, and the screw part is the same as the mesh node of the bolt hole of the transmission case. The upper and lower parts are ...

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Abstract

The invention belongs to the technical field of bolt grid modeling, and particularly relates to a bolt entity grid modeling and loading method. The method comprises the steps: dividing the bolt finite element model by adopting a tetrahedral mesh, creating rigid connection units of constraint points-partial nodes of the transmission shell, and applying constraints; automatically distinguishing bolt models by applying a TCL language, and applying a bolt pre-tightening force: applying loads to corresponding loading points on the transmission shell assembly according to actual working condition loads; and exporting calculation files in the step 1 to the step 4 through Hypermesh software, wherein the calculation files are used for simulation analysis of the transmission shell assembly. According to the method, finite element models of all bolts of the same family are obtained through rapid copying of a bolt model, and bolt pre-tightening force is applied through one key; compared with a currently disclosed bolt modeling method and a bolt pre-tightening force loading method, the method is more advanced and irreplaceable.

Description

technical field [0001] The invention belongs to the technical field of bolt grid modeling, and in particular relates to a bolt entity grid modeling and loading method. Background technique [0002] At present, various R&D centers have started to carry out solid mesh modeling for bolts when analyzing shell assembly components. In engineering, when performing finite element analysis on the sealing pressure of the transmission case, it is necessary to establish a real 3D mesh model of the connection bolts of the transmission case and apply accurate bolt pretightening force. Generally, the number of connecting bolts in a transmission housing assembly is (20-40). The general method of applying bolt pretightening force is to manually build the bolt mesh model and manually apply the bolt pretightening force. A modeling method for a solid bolt mesh as described in the prior art: use pentahedral mesh and hexahedral mesh to divide to obtain a finite element model of a bolt, and calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06F111/04G06F119/14
CPCG06F30/17G06F30/23G06F2111/04G06F2119/14Y02E60/00
Inventor 刘艳玲康一坡朱学武李俊楼闫博张尤龙
Owner CHINA FIRST AUTOMOBILE
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