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Method for determining rigidity of bolt connecting piece

A determination method and technology for connecting parts, which are applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems that the macro-scale of bolted connections is difficult to achieve, and the influence of bolt stiffness is not involved.

Active Publication Date: 2011-05-18
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have their own advantages and disadvantages. The first method can consider the overall stiffness macroscopically, but ignores the influence of the microscopic surface topography on the overall stiffness; the second method considers the microscopic contact stiffness, and the established model is microscopic The model can only reflect the relationship between local surface topography and stiffness, but it is difficult to expand to the macro scale of bolted joints
And these methods do not involve the influence of the bolt tightening process on the stiffness

Method used

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  • Method for determining rigidity of bolt connecting piece
  • Method for determining rigidity of bolt connecting piece
  • Method for determining rigidity of bolt connecting piece

Examples

Experimental program
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Effect test

example 1

[0051] 1. The calculation of the stiffness of the bolted joint in Example 1 includes the following steps:

[0052] 1) According to the actual size of the bolted joint and the actual appearance of the joint surface, the macro-micro finite element simulation model of the bolted joint is established in a layer-by-layer manner from the macroscopic size to the microscopic appearance;

[0053] 2) According to the macro-micro finite element model of the bolted joint, the stiffness model of the bolted joint is established, and the stiffness of the bolted joint is divided into two parts: the matrix stiffness of the bolted joint and the stiffness of the joint surface of the bolted joint. The stiffness of these two parts is obtained through series connection The stiffness of the entire bolted joint, where the stiffness of the joint surface of the bolted joint is obtained by connecting the stiffnesses of each contact asperity in parallel;

[0054] 3) The application and simulation calcula...

example 2

[0080] Establish the same test piece as Example 1, the difference is that Example 2 is only tightened once, and the tightening process is 0:1.5s to directly reach the pre-tightening force of 9000N. The specific implementation steps are the same as the example 1, except that the loading of the bolt force is different from the example 1. As mentioned above, the calculation is performed after the finite element model is established. According to the simulation calculation results and the established connector stiffness model, the stiffness of the bolted connector is calculated, which specifically includes the following steps:

[0081] 1) Calculate the stiffness of the first-level model

[0082] Same as the method of Example 1, the judging condition judges the range of the pressure distribution. The coordinate value of the zero point is 14.517mm, and the contact half angle α=34.55°, so the stiffness of the first-level model is:

[0083]

[0084] 2) Calculate the stiffness of ...

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Abstract

The invention discloses a method for determining rigidity of a bolt connecting piece, which comprises the steps of: establishing a macroscopic finite element simulation model and a microscopic finite element simulation model of a bolt connecting piece; dividing the rigidity of the bolt connecting piece into a matrix rigidity of the bolt connecting piece and a faying face rigidity of the bolt connecting piece, which are connected in series to obtain the rigidity of the whole bolt connecting piece, wherein the faying face rigidity of the bolt connecting piece is obtained by the parallel connection of rigidities of all contact micro-convex bodies; carrying out application of boundary conditions of the combined macroscopic and microscopic finite element simulation models and simulation calculation for the bolt connecting piece; and calculating the rigidity of the bolt connecting piece on the basis of the results of the simulation calculation and the established rigidity models of the boltconnecting piece.

Description

technical field [0001] The invention relates to a method for determining the rigidity of a bolted joint with comprehensive consideration of the bolt tightening process and the microscopic surface topography of the joint. Background technique [0002] In complex mechanical systems such as machine tools, large aircraft, and aircraft carriers, bolted connection is a typical connection method in assemblies. The stiffness of the bolted connection includes the stiffness of the base of the bolted connection and the stiffness of the joint surface of the bolted connection. These stiffnesses directly Affects the performance of the entire mechanical system. Therefore, the introduction of the calculation method for the stiffness of bolted joints can effectively improve the prediction level of the mechanical performance of the whole machine in the design stage. [0003] The calculation of the stiffness of bolted joints has received more and more attention in recent years. The research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李小虎张进华洪军王崴王宁杨国庆
Owner XI AN JIAOTONG UNIV
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