Abstract
Tribological tests were aimed at determining the value of static friction coefficient μ0 of EPUR with hardnesses 75, 80, 83, and 93 ° Sh A, during friction on C45 steel under various lubrication conditions. In the tests, the unit pressure values in the range of p = 0.2 – 0.8 MPa and the time of stationary contact under load were changed in the range of t = 1 – 9 min, both in dry friction conditions, lubricating with water, and lubricating with two types of greases – with low and high adhesion to steel. The tests were carried out on a device whose operating principle is based on an inclined plane. The results of the tests showed that both the unit pressure and the stationary contact time have a significant impact on the value of the static friction coefficient in the EPUR-steel pair.
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