Kozak F.V., Kryshtopa S.I. Estimation of electric currents during triboelectric interaction in metal-polymer friction pairs.
The wear and destruction of frictional materials during friction is caused by the joint action of mechanical, thermal, chemical and electric fields on the surface layers of materials and the effect of their gradients that cause changes in materials. In the micro-contacts of the contacts of the metal-polymer brake vapor during the friction, dynamic loads are present, chemical reactions occur, and thermoelectric currents are generated. The disparate data on the energy volatility of the metal-polymer friction pairs of tribosystems require an assessment of not only external operational parameters, but also the values of circulating triboelectric currents. The latter are largely affecting the energy levels of the surface layers and the wear of the surfaces of the triangles. The specifics of polymer materials is that their operation in friction pairs is accompanied by triboelectrication processes. Electric currents in polymeric lining, which are electrets, are caused by a number of reasons. First of all, these are the processes of electric friction, the change of the electric field or the charge of the electret over time, or simply its presence in the surface layers of the overlay. In general, the current consists of two components: one of them - the conductivity current due to the physical motion of electric charges due to the cross section of the surface layer of the overlay, and the second - the displacement current, appears due to reactive effects.
The purpose of the work is to determine the values of circulating triboelectric currents during mechanical interaction in the metal-polymer friction pairs of tribosystems. In this publication, the following issues are considered in relation to this problem: to investigate the physical picture of the process of electrification of surfaces of metal-polymeric friction pairs of tribosystems during friction; to evaluate charging and discharge processes in the contacts of microvillages of metal-polymer friction pairs; determine the values of circulating triboelectric currents during the interaction in the metal-polymer friction pairs of tribosystems.
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