Problems of Tribology = Проблеми трибології - 2026 рік
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Документ Tribochemistry of damage to metal joints during fretting corrosion(Хмельницький національний університет, 2026) Shevelya, V.V.; Oleksandrenko, V.P.; Dykha, O.V.; Sokolan, K.S.The patterns of fretting wear of a number of structural materials and galvanic coatings were researched, taking into account their mechanical and physicochemical properties. The influence of the composition of the gas environment (air, oxygen) on the intensity of fretting wear was assessed, as well as the contact load with the corresponding temperature recording in the friction zone. Data were obtained indicating the possibility of lowamplitude fretting of metals in an air environment along with the oxidative processes of electrochemical corrosion. The physicochemical prerequisites for the initiation of electrochemical processes in the zone of vibrational contact during the formation of an ultradisperse oxide layer, which becomes a catalyst for the accelerated chemisorption of oxygen and air moisture in radical and ion-radical forms, are considered. As a result, according to the electronic theory of adsorption and catalysis on semiconductors (oxides), contact phenomena begin to develop through the mechanism of autocatalytic corrosion. After a latent period of oxide accumulation, conditions are created for electrochemical processes that contribute to corrosion-fatigue failure of mating surfaces. The results of the study expand existing ideas about the nature of corrosion processes during partial and mixed sliding, focusing on the possibility of using traditional methods of electrochemical protection to increase the fretting resistance of friction units operating under vibration conditions.Документ Experimental and analytical study of acid number variation in engine oils under operational contamination(Хмельницький національний університет, 2026) Dykha, M.O.; Hetman, M.V.; Dytyniuk, V.O.; Makovkin, O.M.This paper presents an experimental and analytical study of the variation of the total acid number (TAN) in engine oils under operational contamination. The research is aimed at assessing the correlation between the acidity growth of lubricants and their wear behavior in the four-ball test configuration. Theoretical modeling and experimental testing were performed to identify the parameters of a wear law that incorporates contact pressure, oil viscosity, hardness, and TAN as key variables. The obtained results confirm that the acid number increases significantly during oil operation: from 0.9 to 2.9 mg KOH/g—which leads to an intensified wear rate of the contact surfaces. The proposed model quantitatively describes the relationship between the acidity level and wear intensity and enables prediction of oil performance based on its physicochemical degradation. The developed approach allows for improved evaluation of the residual life of lubricants and optimization of maintenance intervals for internal combustion engines.Документ Improved algorithm for engineering calculations of the parameters of a container tipping mechanism in a garbage truck taking into account the wear of friction pairs(Хмельницький національний університет, 2026) Bereziuk, O.V.; Savulyak, V.I.; Kharzhevskyi, V.O.; Ivanov, S.Cv.; Yavorskyi, V.Ye.The article is dedicated to the development of the scientifically grounded improved method, based on the analysis of scientific literature sources, for the design calculation of the parameters of a mechanism for tipping a container with municipal solid waste into a garbage truck, taking into account friction wear, in order to determine its main geometric, force, and speed parameters. The drive of the working parts of the mechanism for tipping a container with municipal solid waste into a garbage truck is hydraulic, with a power source from the garbage truck’s pump station. The usage of the proposed improved methodology for the engineering calculation of the parameters of the mechanism for tipping a container with municipal solid waste into a garbage truck, taking into account the wear of friction pairs, allows significant reduction in design time and avoids unnecessary costs for labor-intensive experimental and theoretical research. Using the proposed scientifically based improved method of design calculation of the parameters of the mechanism for tipping a container with municipal solid waste into a garbage truck, taking into account the wear of friction pairs, its main geometric, force, and speed parameters have been determined. It has been established that the development of an improved methodology for the design calculation of the parameters of the mechanism for rotating the manipulator lever during the loading of municipal solid waste into a garbage truck, taking into account the wear of friction pairs, requires further research.Документ Equipment and technology for gas fluorination of polymers to improve their wear resistance under micro-impact loads(Хмельницький національний університет, 2026) Martyniuk, A.; Stechyshyn, M.; Fedoriv, V.; Yaroshenko, P.; Liukhovets, V.The article addresses the problem of improving the cavitation–erosion wear resistance of polymer materials operating under micro-impact loads in corrosive environments. It is shown that material degradation under such conditions has a complex mechano-corrosive nature, while corrosion processes can significantly accelerate the degradation of surface layers. In this regard, the use of polymers with high chemical resistance and inertness to aggressive media is relevant. However, the application of such highly resistant polymers is often economically impractical, which necessitates the development of methods for surface modification of available structural polymers to improve their performance properties. he aim of this work is to develop and scientifically substantiate a laboratory installation and technological parameters of the direct gas fluorination process for polymer materials in order to form a modified surface layer without altering the surface microgeometry and to increase their wear resistance. Polypropylene grade 21060, widely used in mechanical engineering, agricultural machinery, and food equipment due to its sufficient strength, chemical resistance, and processability, was selected as the object of the study. A laboratory installation for direct gas fluorination of polymers was designed using a gas mixture of 1% F₂ and 99% Ar followed by treatment with nitric oxide to neutralize active radicals. Experimental studies showed the formation of a modified surface layer about 5 μm thick with increased chemical inertness. It was established that fluorination significantly reduces the intensity of cavitation–erosion wear of polypropylene in various environments, confirming the effectiveness of the method for improving the durability of polymer components.Документ Electromechanical wear of the contact wire–current collecting insert pair in electric transport systems(Хмельницький національний університет, 2026) Kovtun, O.S.; Polishchuk, A.O.The article considers the processes of current collection and wear in the sliding electrical contact system "contact wire - current collection insert" of a trolleybus. It is shown that the destruction of contact surfaces has a complex electromechanical nature and is caused by the simultaneous action of mechanical, electrical and thermal factors. The main mechanisms of electrical and mechanical wear of contact elements are analyzed, in particular, electroerosion, abrasive, fatigue and molecular-mechanical wear. The influence of contact pressure, current collector speed, traction current magnitude and properties of contact pair materials on the intensity of destruction of surface layers is considered. It is shown that the uneven distribution of current in the contact zone leads to local overheating of the surface and the formation of electric arcs, which accelerate the electroerosion destruction of contact elements. It is established that the formation of a thin graphite film on the surface of the contact wire can partially reduce the friction coefficient and wear intensity. The results obtained can be used to increase the durability of current-collecting elements of electric transport and optimize their operating modes.