Junction finite element modelling method of bolt connection

A technology of screw connection and modeling method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of meeting the needs of engineering calculations

Inactive Publication Date: 2016-07-27
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies in the complex process of parameter identification and model correction in the finite element modeling of the joint part of the existing screw connection, the present invention proposes a finite element modeling of the rigid connection of the finite element unit node within the effective contact area of ​​the joint part of the screw connection method, based on the existing design parameters, the finite element model of the joint part of the screw connection is established, and the dynamic characteristics of the joint part that meet the actual needs of the project can be obtained through calculation

Method used

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  • Junction finite element modelling method of bolt connection
  • Junction finite element modelling method of bolt connection
  • Junction finite element modelling method of bolt connection

Examples

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Embodiment

[0086] Taking a printed board fixture as an example of finite element modeling, the printed board fixture uses 32 A2-50 M4 screws to connect and fix four 5F05 aluminum plates together.

[0087] (1) Calculation of the diameter L of the effective contact area of ​​screw connection parts

[0088] It is known that the elastic modulus of the aluminum plate connected by screws is E=70×10 9 Pa, roughness f=6.3×10 -6 mRa, In the actual application of the screw, the screw torque under the non-proportional elongation stress of 0.6 to 0.7 times is usually used as the pre-tightening torque, F N It is the compressive force generated under the action of this torque. The relevant parameters of the M4 screw of model A2-50 (GB819) can be found in the design manual as shown in Table 1 below:

[0089]

[0090] Table 1

[0091] According to the Hertzian contact theory and the G-W (Greenwood-Williamson) model, the calculation formula can be obtained as follows:

[0092] ...

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Abstract

The invention disclose a junction finite element modelling method of bolt connection. The method comprises the following steps: obtaining an effective contact area of the junction through above hertz contact theory and G-W model description, rigidly connecting corresponding unit nodes in the effective contact area in the finite element modelling, thereby establishing a joint part model. The finite element modeling method for avoiding the complex process of parameter recognition and model modification in the junction finite element modelling of the bolt connection, enabling the dynamic feature of the computation of the junction of the bolt connection to be more consistent with the actual condition, and rigidly connecting the finite element unit nodes in the junction effective contact area is provided by the invention.

Description

technical field [0001] The invention relates to the field of finite element calculation and analysis of mechanical structures, in particular to a finite element modeling method for joints of screw connections. Background technique [0002] At present, in the analysis of static and dynamic characteristics of electromechanical product structures, viscoelastic elements (spring-damper models) are generally used to equivalent screw joint joints. Usually, the overall finite element reverse solution is performed on the structure to obtain the damping parameters and stiffness of the joint, or to establish a lower-dimensional matrix relationship between the stiffness, damping parameters and the measured transfer function of the joint, and propose a corresponding identification method to obtain the damping of the joint. parameters and stiffness. There are three main deficiencies in the existing joint model establishment methods: ①The spring-damper models in the spring-damper model ar...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/13G06F30/23
Inventor 李奇志陈文华潘骏周才东奚修智
Owner ZHEJIANG SCI-TECH UNIV
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