Friction and Wear Behavior of a Dry Sliding Electrical Contact Stretched Cable-Disc

Boubechou, C.; Bouchoucha, A.; Zaidi, H.
November 2011
International Review of Mechanical Engineering;Nov2011, Vol. 5 Issue 7, p1327
Academic Journal
On electrified rail line, the necessary energy for the traction of vehicles on rail is transferred by a sliding contact copper-stainless steel. During the functioning, the couple is submitted to severe conditions, in more of electrical and mechanical parameters, the climate factors and environment play an important role and determine the life service of the couple. To understand the phenomena acting on the contact we study the friction and wear processes of the catenary, simulated as cable of diameter 2.6 mm, where its replacement is expensive. For this reason, we have used the contact a pin-disc tribometer, modified in disc U-shape frame between which cooper cable is stretched wire-disc to study the tribological behavior of the couple. The copper cable is subjected to tensile mechanical 110N/cm², the rubbing disc is of steel 304 L. The dry friction and wear of the cable are studied with the parameters: bearing load (1-20N), sliding speed (0.25-7m/s), electrical current (0-40A), its polarity and time. The test duration is (1-2h). The experimental results show that these parameters have a more or less significant effect on the tribological behavior of the couple. The discussion of results is based on observations with optical and scanning electronic microscopes and interfacial phenomena resulting from the sliding contact.


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