ANALYSIS OF WEAR PROCESS OF MECHANICAL SYSTEM “0.45% CARBON STEEL – POLYTETRAFLUORETHYLENE” DURING SLIDING AND MECHANO-SLIDING FATIGUE USING FRACTURE MECHANICS CRITERION

BOGDANOVICH Alexander V., D. Sc. in Eng., Assoc. Prof., Professor of the Department of Theoretical and Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The results of the tests for a friction pair “a cylindrical specimen made of 0.45% carbon steel — a prismatic counterspecimen-liner made of polytetrafluoroethylene F4-B” during sliding friction and mechano-sliding fatigue at different levels of contact load are presented. The experimental data are analyzed using the Archard’s equation and are presented as kinetic dependencies of wear and a friction fatigue curve. The concept of the frictional stress intensity factor during sliding friction is introduced, and the expression is proposed that relates the wear rate to this factor and is close in shape to the Paris equation in fatigue fracture mechanics. Satisfactory compliance of the results of testing the metal-polymer tribo-fatigue system to the proposed expression is obtained both under conditions of sliding friction and under mechano-sliding fatigue.

sliding friction, mechano-sliding fatigue, tribo-fatigue system, contact pressure, wear, stress intensity factor

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