Study of the Electric Resistance of Contact of Frictional Technical Surfaces by Computer-Aided Simulation

The software complex was developed on the basis of the proposed mathematical model of the electrical resistance of a single roughness of a rough surface. It is capable of predicting the electrical resistance of the frictional contact of technical surfaces, including those with different functional coatings by the method of discrete-event modeling. Modeling of the frictional contact of technical surfaces allows for a systematic approach to morphology research. The mentioned approach also considers the features of the physical and mechanical processes occurring at every spot of actual contact. The model uses the following as input data: nominal geometric dimensions of the contact, applied normal loads, standard characteristics of the microgeometry of technical surfaces, presence and thickness of functional coatings and oxide films, physical and mechanical properties of contacting bodies, and functional coatings and films. Varying the input data allows numerical experiments at the design stage and make science-based and technological solutions that increase the operational characteristics of moving electrical contacts. The proposed algorithms are tested by comparing the results of numerical experiments with published confirmed experimental data. Results can be used to design electrical contacts for energy systems, automation and telemechanics.