Modeling and simulation of dynamical contact of asperities between flat rough surfaces

Yanqing Tan,Lianhong Zhang,Xiaoyong Lv,Lianjie Ma

doi:10.1177/1687814016673498

Yanqing Tan, Lianhong Zhang + Show 2 more

Open Access

https://doi.org/10.1177/1687814016673498

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Abstract

Dynamic contact analysis on the level of surface asperities is a powerful means to study the wear behavior of surface and the physical contact properties of interface. This article established an analytical model of asperity contacts between nominal rough planes during sliding process based on the statistical contact analysis of rough surfaces. The analytical expression describes the mathematical relationship between the total number of asperity contacts and its main influencing factors including the nominal contact area, sliding distance, the spacing between two contact planes, and surface topographical parameters. A simulation model of dynamic contact of asperities on rough planes was established to rapidly calculate the number of asperity contacts during the sliding process. The comparison between the calculation results and simulation results of the number of asperity contacts obtained through multifactor and multilevel analysis verified the rationality of the analytical model.

Highlights

Since machining surfaces are composed of randomly distributed asperities with different heights, the contact of rough planes in movement will lead to the elastic or elastic–plastic dynamic contact of the asperities
Studies of rough surface contact were mainly focused on the features of the pure contact, including the contact area, deformation, and stress distribution of single asperity or multiple asperities under a certain external force
Total number of asperity contact during sliding process is an important factor in microscopic fatigue wear of the surfaces

Summary

Introduction

Since machining surfaces are composed of randomly distributed asperities with different heights, the contact of rough planes in movement will lead to the elastic or elastic–plastic dynamic contact of the asperities. Based on the statistical analysis theory, a surface asperity model was established to analyze the static elastic contact parameters of two rough planes, including the contact area and the number of the contacted asperities.

Results

Conclusion