Analytical method for contact performance of junction surface containing microcosmic surface shape

Abstract

The invention discloses an analytical method for a contact performance of a junction surface containing a microcosmic surface shape. According to the analytical method, the gridding dividing quality and the solving efficiency are increased and the forecasting accuracy and reliability of the contact performance of rough surfaces are improved. The analytical method comprises the following steps: measuring a practical surface through a laser confocal microscopy or obtaining the rough surfaces by utilizing a three-dimensional shape digital simulation method; extracting a height matrix of the shape of each 3D (Three-Dimensional) rough surface; utilizing a point cloud processing method to discretize each 3D rough surface into a height matrix file which is easily extracted by finite element software; importing the height matrix files into the finite element software, thereby generating a microcosmic shape of each connecting surface of the junction surface; establishing body models considering the microcosmic surface shapes by utilizing translation coordinate modifying functions of a key point of the finite element software; performing hexahedron gridding division on each body model according to a gridding control method; establishing finite element contact models in contact with the two 3D rough surfaces; gradually applying displacement and force loading boundary conditions; and analyzing the contact feature of the junction surface.

Description

technical field [0001] The invention relates to a method for simulation analysis of joint surface contact performance, especially a method for simulation analysis of joint surface performance considering the contact of two 3D rough surfaces, which can be used to analyze the contact of friction, wear, contact stiffness, contact thermal resistance, etc. of microscopic rough surfaces performance. Background technique [0002] There are a large number of joint surfaces in the mechanical system. The existence of these joint surfaces has a great influence on the overall characteristics of the mechanical system, and the contact of the joint surface is actually the contact of its rough surface. The rough surface morphology has a great influence on the friction, wear and contact of the joint surface. Deformation has an important effect. [0003] For a long time, scholars at home and abroad have carried out a lot of research on the contact of rough surfaces from the theoretical level...

AI Technical Summary

Problems solved by technology

It is precisely because of these assumptions that it cannot fit the actual asperity contact state between the bonding surfaces, which greatly affects the accuracy of using the analytical model to predict the performance of the bonding surface

[0004] In order to solve the above problems, in recent years, some scholars have proposed the method of using the finite element numerical model to simulate the microscopic contact between the bonding surfaces, but it mainly focuses on the analysis of the contact performance of a single pair of asperities and the analysis of the contact performance of a smooth surface-rough surface. , the simulation analysis of the contact performance of two 3D rough surfaces that is more suitable for the actual contact state has not yet been realized

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