ANALYSIS OF 3D ROUGHNESS PARAMETERS FOR WEAR SCARS OBTAINED ON FOUR-BALL TESTER, LUBRICATED WITH RAPESEED OIL

Lorena DELEANU, Constantin GEORGESCU, George Ghiocel OJOC, Cornel SUCIU, Traian Florian IONESCU

Abstract


This study aims to underline that, especially for worn surfaces, only one roughness parameter (usually Sa) is not enough to establish the influence of test parameters and lubricant on the tribological behavior of the tribosystem. The study identifies which of the analyzed 3D roughness parameters could be correlate to tribological features like friction coefficient and wear represented by wear scar diameter, in four-ball tests. The association of wear with surface quality may help evaluate the durability of the contact of interest and select a more effective lubricant that reduces wear and keeps the surface quality acceptable for further running. This analysis can be qualitative, through images of the worn zones, but also quantitative through the measured and calculated values and the dependence function between them. There were investigated the entire wear scars from a representative test campaign on four-ball machine, using as lubricant the rapeseed oil. Test parameters were load at the main shaft of the four-ball machine (100 N, 200 N and 300 N), sliding velocity (1000 rpm, 1400 rpm and 1800 rpm) and duration (1h). There were discussed amplitude and functional parameters.

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