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
CN112685940APending Publication Date: 2021-04-20摩登汽车(盐城)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
摩登汽车(盐城)有限公司
Publication Date
2021-04-20

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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.
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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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