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Finite element modeling method for simulating bolt collision fracture failure

A modeling method and finite element technology, applied in the fields of instruments, electrical digital data processing, geometric CAD, etc., can solve the problems of inability to simulate bolts accurately and the contact relationship of bolt structures, so as to shorten the development cycle and improve the reliability. , the effect of reducing development costs

Pending Publication Date: 2021-04-20
摩登汽车(盐城)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot simulate the contact relationship between the bolt structure and the surrounding parts, and can only simulate and monitor the load on the screw here through beam
[0009] The above four methods all have considerable limitations, and none of them can accurately simulate the bolt loading situation under the condition of meeting the accuracy requirements

Method used

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  • Finite element modeling method for simulating bolt collision fracture failure
  • Finite element modeling method for simulating bolt collision fracture failure
  • Finite element modeling method for simulating bolt collision fracture failure

Examples

Experimental program
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Effect test

Embodiment

[0054] Provide a finite element modeling method for simulating the failure of bolt collision fracture, the analysis software is LS-dyan, such as figure 1 shown, including the following steps:

[0055] Bolt model modeling steps: layout points and use such as figure 2 The shown beam unit (the beam unit is displayed as BEAM in the analysis software LS-dyan) establishes the bolt central unit, and sets the outer circumference of the bolt central unit as follows: image 3 shown in the bolt shell unit, and assign material parameters to the bolt shell unit; among them, the bolt central unit corresponds to the nodes of the bolt shell unit one by one, and a rigid connection is set between the bolt shell unit and the corresponding nodes of the bolt central unit, and the following is obtained: Figure 4 The bolt model shown.

[0056] Specifically, in the bolt model modeling step, the bolt model is the most important part of the entire bolt connection modeling, and the contact and load ...

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Abstract

The invention provides a finite element modeling method for simulating bolt collision fracture failure. The finite element modeling method comprises the following steps that bolt center units are established through beam units, bolt shell units are arranged, material parameters are given to the bolt shell units, the bolt center units are in one-to-one correspondence with nodes of the bolt shell units, and rigid connection is arranged between the corresponding nodes. And a nut model is established, the outer surface of the nut model is divided into nut shell units, and the nut shell units are endowed with material parameters and nut quality. A rigid connection is established between corresponding nodes of the bolt shell unit and the nut shell unit. The bolt shell unit and the nut shell unit are added into contact with an external component. And a preload for each beam unit generated is set in the bolt modeling step. Material parameters are given to the beam units, and corresponding failure force and failure moment limit values are added to the material parameters. The model established by the modeling method is used for simulating the collision response, the simulation result is more accurate, the real vehicle collision frequency is reduced, and the development cost is saved.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a finite element modeling method for simulating the collision fracture failure of bolts. Background technique [0002] Bolt connection is an important connection method of auto parts. In the vehicle crash simulation model, the bolt load of key parts and whether it breaks or fails has a very important impact on the simulation results. If the local load and deformation state of bolts can be accurately simulated in the vehicle crash simulation model, and the fracture failure of key connection positions can be predicted, the simulation accuracy of the vehicle will be greatly improved and the development cost will be reduced. [0003] In current practical applications, four methods are usually used. [0004] The first is to make the units of the components that need to be bolted near the bolt holes into rigid bodies, and these rigid bodies are rigidly bound by the DYNA keyword *CONSTRAINED...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/17G06F119/14
Inventor 陈亚军安超群黄晨晖李楠
Owner 摩登汽车(盐城)有限公司
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