Influence of the nature of boundary lubricating layers on adhesion component of friction coefficient under rolling conditions

Self-organization mechanisms of metastable dissipative structures during friction depending on base and oil functional additives for hypoid gears are considered. Research was conducted on a software-hardware complex with simulation of gears operation in rolling with slipping conditions in start-stop mode. Indicators of formation of wear-resistant dissipative structures include the following: improvement of antifriction characteristics, lubricant boundary layers formation, contact surfaces strengthening, and formation of heterogeneous deformation microrelief with a fine-grained structure. The formation of chemically modified boundary layers on 90 of the contact area of tribo-coupling elements ensures an increase in the wear resistance of leading and lagging surfaces by 2 and 1.4 times, respectively. The sclerometry method was used to establish that the formation of dissipative structures when lubricating tribo-coupling elements with various transmission oils can reduce deformation processes in metal near-surface layers by 23. Highly viscous flavored lubricant with distillate oil and additive composition ensures wear-resistant dissipative structures with active components, including oxygen, sulfur, and phosphorus.

The damage analysis of aircraft parts made of titanium alloys is carried out. Damage resulting from cyclic loads in the form of wear is shown. Gas-thermal coatings based on nickel for protection and restoration of parts made of titanium alloys are analyzed. The results on fretting resistance of some coatings that were applied by plasma method are carried out. It is established that the most fretting-resistant are coatings based on ВK, as well as a molybdenum coating. It is theoretically determined that with an increase in temperature in the friction zone, the logarithmic decrement of the molybdenum coating increases more than that of nickel-based coatings. It is established that due to the high hardness of the ВK type coating, it is possible to protect titanium parts of high rigidity, where the main operational factor is friction. In cases where wear of parts is combined with other loads such as bending, torsion, stretching, the optimal choice will be a molybdenum coating on parts made of titanium alloys.

та проведення стандартизованих механічних випробувань при розробці нових композиційних матеріалів з метою підвищення надійності виробів та конструкцій. Проведено аналіз сучасних програмних комплексів скінченно-елементного аналізу SolidWorks, ANSYS, Abaqus та Patran/Nastran та розглянуто потенційні механізми руйнування при моделюванні властивостей композиційних матеріалів. Проаналізовано методи механічних випробувань композиційних матеріалів, умови та процедуру проведення випробувань за стандартами ISO та ASTM. Аргументована процедура створення нормативно-технічної бази у сфері виробництва та застосування композиційних матеріалів.

The mechanical and tribotechnical characteristics of polymer materials are analyzed and the possibility of their improvement by adding reinforcing substances is shown. For Teflon-based composite materials, no change in antifriction properties has been established under lubrication conditions, compared to friction conditions without lubrication, the friction coefficient is reduced by only 1-3%. Effective fillers of polymer materials include carbon fibers, MoS2. , graphite, graphene, SiO2, etc. It was analyzed that the addition of silicon carbide to polyvinyl chloride increases the anti-friction characteristics, heat resistance and dielectric properties of the polymer. Antifriction materials based on polyvinyl chloride have a relatively low coefficient of friction, but it can be improved if silicon carbide is dispersed on the surface of the polymer. It is substantiated that knowledge of the mechanical and tribotechnical characteristics of interacting tribomaterials is necessary for their selection from the point of view of the safety and efficiency of sliding bearings in the machine-building industry.