Method for calculating friction coefficient of contact surface of bolted structure

A technology of contact surface and friction coefficient, which is applied to the calculation of the friction coefficient of the contact surface of the bolted structure, and the calculation field of the friction coefficient of the contact surface, which can solve the problem that the friction coefficient of the bolt cannot be measured and other problems

Inactive Publication Date: 2018-11-20
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] The problem to be solved by the present invention is to solve the problem that the friction coefficient in the bolt fastening process cannot be measured in the existing method

Method used

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  • Method for calculating friction coefficient of contact surface of bolted structure
  • Method for calculating friction coefficient of contact surface of bolted structure
  • Method for calculating friction coefficient of contact surface of bolted structure

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] 1) Generally, the friction coefficient of the dry friction sliding surface is considered to be the result of the joint action of the asperity furrow, the asperity occlusion, and the furrow of the wear particles remaining on the surface after the friction pair wears. refer to figure 2 As shown, according to the Florida contact theory, the Florida contact model based on the bolt connection is established.

[0021] 2) Considering the average shear stress of each actual contact point of the bolted contact surface, the total plastic deformation energy is equal to the sum of the plastic deformation energy of a single contact point, and the general formula for the dynamic friction coefficient between friction pairs is obtained:

[0022]

[0023] Where: i is the asperity contact point, i=1, 2,..., N j ;

[0024] P is the total load in the vertic...

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Abstract

The invention discloses a method for calculating the friction coefficient of a contact surface of a bolted structure, and relates to the technical field of methods for calculating the friction coefficients of contact surfaces. The method is based on a Florida contact model, a pressure distribution function for a bolted contact surface is introduced, the elastic, elasto-plastic and full plastic deformation of micro-bulges on the micro scale are considered to construct an exponential distribution function containing peak height variation parameters of the micro-bulges, and a friction coefficientmathematical model with improved exponential distribution is then established, so that the friction coefficients of different bolted contact surfaces can be accurately calculated. The calculation method involves the parameters of the bolted contact surface, and the feasibility of the method is verified by experiments. At the same time, the calculation result of the friction coefficient of the bolted contact surface based on the Florida theory can be obtained by using the roughness parameter of the bolted surface.

Description

technical field [0001] The invention relates to a calculation method for the friction coefficient of a contact surface, in particular to a calculation method for the friction coefficient of a bolted structure contact surface, and belongs to the technical field of friction calculation and analysis. Background technique [0002] In actual engineering, people design various mechanisms and improve the safety of equipment by controlling the coefficient of friction. For a specific friction pair, accurately obtaining the friction coefficient becomes the key to analyze and solve the problem. The specific friction pair cannot accurately reflect the actual situation, mainly because the actual contact surface and the mechanism involved are very sensitive to the geometry of the friction pair, the applied load, the environment and other factors. Most of the work is for typical mechanical systems, such as bearings, friction discs, etc., to conduct friction coefficient measurement experim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 程强徐文祥蔡力钢刘志峰杨聪彬赵永胜
Owner BEIJING UNIV OF TECH
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