Assessment of friction pair elements condition based on changes in the geometric surface structure isotropicity degree

Maciej Matuszewski,Danil Yu Pimenov,Adam Mazurkiewicz,Małgorzata Słomion,J Musiał,M Matuszewski,T Kałaczyński,Ł Muślewski

doi:10.1051/matecconf/201930201015

Abstract

This paper regards the possibility of using the degree of the surface isotropicity to assess the condition of the surface layer friction pair elements. The analysis is based on certain changes in operational and technological surface layer. The methods of constituting the surface layer have been characterized due to the features of geometric surface structure as well as the problem of assessing the condition of surface in terms of functional features and tribological characteristics. The evaluation of the occurring changes in the surface layer have been conducted by performing tribological tests and for descript condition of surfaces the degree of surface isotropicity and weight loss of specimens have been adopted. Whereas the assessment of technological state of the surface layer has been carried out for the surface after its coating. Based on the analysis, it has been found that the use for assessment the condition of surface layer and the degree of the surface isotropicity are useful and it is an alternative way or supplement to classical adoption of a properly selected set of roughness parameters to evaluate the potential functional characteristics of friction couples surfaces.

Highlights

Each technical object has a set of functional qualities, such as: reliability, wear resistance, fatigue strength, resistance to movement, corrosion resistance, etc
- weight- loss method- realized by reducing object dimensions, e.g. machining, erosion, blasting work, - loss- free method- implemented without reducing the dimensions of the object, e.g. heat treatment, plastic working, implantation, Physical vapour deposition (PVD), CVD, - incremental method- realized by increasing the dimensions of the object, e.g. electrolytic coating
The functional characteristics of machine is determined by the condition of the surface layer elements after last operation, that is why this condition should be adopted as the technological surface layer of the finished element and it does have a static character

Summary

Introduction

Each technical object has a set of functional qualities, such as: reliability, wear resistance, fatigue strength, resistance to movement, corrosion resistance, etc. It has been confirmed that the mechanism and intensity of wear process depend on features of the surface layer, established as a result of technological processes [9,10,11,12]. Affected by these factors (for example: mechanical, thermal, chemical and electrical) while the friction pair is working, the surface layer is changing. These changes usually cause a different loss degree of kinematic pairs ability to work to fulfill structurally accepted functions

Methods

Results

Conclusion