Study the Effect of Oil Viscosity on Friction Coefficient at Point Contact Elasto-Hydrodynamic Lubrication Based on Experimental Analysis

Hassan S Fatehallah,Lutfy Y Zidane,Zaid S Hammoudi

doi:10.24237/djes.2020.13203

Hassan S Fatehallah, Lutfy Y Zidane + Show 1 more

Open Access

https://doi.org/10.24237/djes.2020.13203

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Abstract

This study presents an experimental work for elasto-hydrodynamic lubrication (EHL) in point contact case. In this study, experimental studies have been conducted to show how friction varies over a wide range of running conditions. The effect of the change in parameters such as lubricant’s viscosity, base oil type, and load on power loss is investigated. The oils have used (5W-20, 10W-30, 10W-40 and 20W-50) which have a different grade of viscosity. The test is conducted using a ball on disc test rig. Different loads have been used (30, 40, 50, and 60 N). The boundary conditions are: the oil’s temperature is (25 oC temperature room); the radius of ball is (0.018 m). The coefficient of friction of oils for each load has been calculated. At the same load and same initial conditions the results shows, the increase in friction coefficient with the increase of viscosity is almost linear with an average slope of 1.4 (Pa.s)-1. Also, the increase in load results in linear increase in friction coefficient by an average slope of 0.63 N-1

Highlights

Wear and friction can be noted in different places in our everyday life
Therefor it is important to minimize the effect of those factors, in any mechanical system [1]
The results of this study show that the mapping is efficient for showing the different types of friction that may occur in an elastohydrodynamic lubrication (EHL) contact

Summary

Introduction

Wear and friction can be noted in different places in our everyday life. They occur whenever two components in contact, with a relative motion on each other. In mechanical system wear and friction generally, appear harmfully at many levels. Friction leads to increase energy consumption of the system, whereas wear can decreases system life. Therefor it is important to minimize the effect of those factors, in any mechanical system [1]. The most known way to reduce friction is lubrication. When two surfaces are in contact, the lubricant film separated it. There are three lubrication regimes, defined according to their range of coefficient of friction, boundary lubrication, mixed lubrication, and full film lubrication [2]

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