Abstract
Lubricant contaminants cause severe problems to machines. Substantial research has been conducted to study the impact of such contaminates on the tribological performance of lubricated contacts. The primary goal of such studies is to find solutions to avoid the dirtiest cause of damaging machines’ parts and to reduce energy consumption and maintenance costs. The current study investigates the tribological behavior of contaminated lubricated contacts; the contaminants considered in this research are sand particles. The effect of the sand particles concentration levels on friction and wear of a tribological system under sliding contact was studied. Three different concentration levels were tested; 5%, 10% and 15%.The experimental program was carried out using an in-house built ball on disc machine at room temperature, constant normal load, constant speed, constant running time and constant travelling distance. Results showed that both friction coefficient and wear volume of the contacting surfaces are dependent on the concentration level of the sand particles. Both friction coefficient and wear volume increased by increasing the sand particles concentration. SEM was utilized to study the wear mechanisms of the contacting surfaces, it was found that the dominant wear mechanism in all cases was abrasive wear.
Highlights
Tribology is the science and technology of interacting surfaces in relative motion
All tests were done using the same range of sand particles size (75-125 μm), the variation was in the concentration only (5 %, 10 % and 15 % wt)
The friction appears that the highest friction coefficient is at 15% concentration of sand particles, whereas the lowest one is for that samples with 5% concentration, while that samples had been tested without sand particles “fresh oil only “the average μ is 0.1125 ± 0.0010939801)
Summary
Tribology is the science and technology of interacting surfaces in relative motion. It studies the principles of friction, wear and lubrication [1]. Many researchers have done experimental as well as theoretical studies to explore the effects of sand particles on such machines. This work studies the effect of sand particle concentrations on the friction and wear of a sliding contact. Experimental program was carried out using an in-house built ball on disc machine at the following constant parameters: room temperature, normal load, speed, running time, track. The apparatus used in this experimental study is ball on disc Testing, the same as outlined by ASTM G99-04, ball-on-disc testing consists of a rotating disc in contact with a fixed ball with a spherical top as shown in figure 2
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