International Congress on Recent Innovations in Engineering, Science and Technology - Istanbul - Turkey (2019-10-31)

Methodology and results of computer simulation of the stress-strain state of roller-screw mechanisms without coating and with coating
The article presents computer modeling and analysis of the stress-strain state (SSS) of planetary roller-screw mechanisms (RSM) without coating and with coating. The problem of determining the stress-strain state was solved by the finite element method. Calculation of mechanisms was carried out for static loading conditions taking into account friction in the contact zone. When modeling the mechanism with a coating in the computational model, a substructure was created, including a coating and a substrate, for the most loaded turn of the RSM roller in conjunction with the nut. The physical and mechanical characteristics of the coating corresponded to the hardening coating. According to the results of the analysis of the SSS of the RSM parts on the turns of the nut and roller, zones with the maximum stress level were identified, for which the strength reserves were determined by the fatigue failure criteria for the case with and without coating. In the analysis of stress-strain state in the presence of a coating redistribution of stresses, while there was a decrease in stress intensity in the contact area and increase stress intensity in the contact area on the surface of the turns of the nut, which leads to a reduction of the margin of safety for the most loaded turns of about 17%. When using a hardening coating, the strength characteristics and, accordingly, the margin of safety of the most loaded turns of the roller are significantly increased.
Professor Aleksey Zhdanov, Assoc. Prof. Alexander Ivanchenko, Dr. Valentin Morozov, Assoc. Prof. Leonid Belyaev