Study of the Stress-Strain State in the Contact Zone of the Cylinder Liner’s Working Surface

One of the reserves for increasing the durability of cylinder liners of internal combustion engines is the achievement on their working surface after technological processing of a set of geometric characteristics and physical-mechanical properties favorable from the point of view of wear resistance. Simulation of the “liner – ring” mating using the finite element method allowed for obtaining a qualitative picture of changes in the main parameters of the stress state. However, this approach did not allow for clarifying and studying the main regularities of the stress-strain state in the contact zone more thoroughly . In this connection, the paper proposes a study of the regularities of stress changes in the surface layer of the “liner – ring” mating using an analytical solution. The study of the regularities of the stress state in the contact zones using the analytical approach allowed us to confirm the main regularities obtained by the finite element method: at the boundaries of the contact areas, there are peaks of axial stresses – tensile and compressive at different ends of these areas. Simultaneously, new regularities have been established: the magnitude of the peaks strongly depends on the contact friction forces and the length of the transition section, and the shorter the length of the transition section, the larger the peak magnitude. The established regularities allowed us to present the actual interaction scheme between the piston ring and the working surface of the liner. To reduce the value of axial stress peaks in the contact zone “liner – ring”, it seems reasonable to apply antifriction coatings on the working surface of the liner.