Abstract
The paper aims is to present aspects regarding the evolution of contact mean pressure obtained in four balls standardized test, in order to highlight a correlation between contact mean pressure and the moment when the scuffing occurs. Different types of greases were used in tests to evaluate the contact loading capacity and the wear scar dimensions correlated with loading force. Several tests were conducted following the testing procedure described in EN ISO 20623:2003 international standard. Using a laser profilometer, the dimensions of the wear scar were obtained for all loading levels. The contact mean pressure was determined from the ratio between the normal contact load and wear scar area. The experimental values were compared with those based on Hertz equations. The evolution of contact mean pressure and wear scar area was related to scuffing occurrence.
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