Features of Contact Interaction and Three-Dimensional Stress-Strain State of the System for Friction-Mechanical Fatigue Testing

The purpose of the study is to determine by finite element method the stress-strain state and behavior of the contact interactions characteristics under various loading conditions of the liner-shaft system, which is used for materials research when operating under conditions of frictional and mechanical fatigue. The cases of loading the system with different ratios of contact forces applied to the liner and bending forces applied to the shaft are considered. The verification of the obtained results is carried out using beam theory and contact theory. According to the results of the study, it is shown that depending on the direction and magnitude of the bending load, it is possible to form contact area of three different shapes: rectangular, elliptical and divided into two parts. Furthermore, optimal load ratios minimizing the von Mises stresses were identified: in the liner with co-directed F_b and F_N at a ratio of F_N/F_b = 20—50 (e.g., at F_N = 500 N, F_b = 25 N); in the shaft with oppositely directed F_b and F_N at a ratio of F_N/ F_b = 20 (e.g., at F_N = 500 N, F_b = 25 N). Thus, the presented approach to modeling volumetric damage in a friction pair, one element of which is loaded by a non-contact force, provides an opportunity to solve optimization and damage management problems for complex technical systems by controlling boundary conditions without costly design or material changes.

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