Перегляд за Автор "Babak, O."

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  • Ескіз
    Документ
    Calculation-experimental modeling of wear of cylindrical sliding bearings
    (Edition of Eastern-European journal of enterprise technologies, 2017) Dykha, A.; Sorokatyi, R.; Makovkin, O.; Babak, O.
    Запропонована модель зношування підшипника ковзання в умовах граничного тертя у вигляді залежності інтенсивності зношування від контактного тиску і швидкості ковзання. На основі моделі зношування вирішена зносоконтактна задача для циліндричного підшипника ковзання. Для ідентифікації параметрів зносостійкості розроблена теорія методу випробувань на знос за схемою "конус–три кульки". Наведено приклад реалізації методу розрахунку зносу підшипника ковзання. Отримані результати рекомендуються для прогнозування зношування підшипників ковзання з урахуванням впливу конструктивних і експлуатаційних факторів
  • Ескіз
    Документ
    Modeling surface structure of tribotechnical materials
    (Хмельницький національний університет, 2024) Drach, I.; Dykha, M.; Babak, O.; Kovtun, O.
    Modern tribology makes it possible to correctly calculate, diagnose, predict and select appropriate materials for friction pairs, to determine the optimal mode of operation of the tribo-joint. The main parameter for solving friction problems and other problems of tribology is the topography of the surface. The main purpose of the models in these tasks is to display the tribological properties of engineering surfaces. In the framework of the classical approach, the topography of the surface is studied on the basis of its images from the point of view of functional and statistical characteristics: the evaluation of the functional characteristics is based on the maximum roughness along the height and the average roughness along the center line, and the statistical characteristics are estimated using the power spectrum or the autocorrelation function. However, these characteristics are not only surface properties. They depend on the resolution of the device for measuring the surface geometry and the length of the scan. However, the degree of complexity of a surface shape can be represented by a parameter called the fractal dimension: a higher degree of complexity has a larger value of this parameter. Fractal dimensionality is a characteristic of surface relief and makes it possible to explain tribological phenomena without the influence of resolution. This article provides an overview of mathematical approaches to the description of the relief of engineering surfaces, in particular statistical, stochastic and topological modeling, their limitations, advantages and disadvantages. The implementation of the principles of the theory of fractal structures is discussed, which makes it possible to introduce the degree of imbalance of the tribological system into the analysis of structure formation in the surface and near-surface layers of materials and to describe the development of friction and wear processes. This is the basis for controlling the structure of the surface layers of materials with given properties. The concept of fractals, used for the quantitative description of the dissipative structure of the tribojunction zone, makes it possible to establish a connection between its fractal dimension and mechanical properties, as well as critical states of deformation of metals and alloys. The course of research and stages of fractal modeling, the classification of methods of fractal analysis of the structure of engineering contact surfaces are considered. A critical analysis of modern models based on the energy-spectral density function, which are quite similar to fractal models, is presented. Readers are expected to gain an overview of research developments in existing modeling methods and directions for future research in the field of tribology.
  • Документ
    The wear models of cylindrical sliding tribosystems
    (2017) Dykha, О.; Babak, O.; Dykha, M.
  • Ескіз
    Документ
    Tribological properties of anode-spark coatings on aluminum alloys
    (Хмельницький національний університет, 2022) Dykha, O.; Babak, O.; Makovkin, O.; Posonskiy, S.; Диха, О.В.; Бабак, О.П.; Маковкін, О.М.; Посонський, С.Ф.
    It is established that at present the technology of anode-spark coatings in general is well studied. However, the lack of recommendations for the choice of modes of technological processes and tribological characteristics in different operating conditions limit the widespread introduction of this technology. The task of this work was to analyze the processes of anode-spark coatings, improve technology and study the wear resistance of samples processed by this and traditional anode technology. The development of technology for the application of protective coatings on valve metals in the conditions of spark discharge included the choice of electrolyte and mode of operation of the bath: voltage, current density, hydrodynamic conditions and other parameters. Wear resistance tests were performed on a special installation. Structurally, the installation is made in two positions, which allows you to test two samples with different load conditions at a constant sliding speed. The design of the installation implements the friction scheme of the liner shaft. The study of anode-spark coatings in the mode of limiting lubrication was studied in the environment of industrial oil. The wear criterion was the weight wear of the samples according to the results of weight measurements before and after wear. It is established that prolonged electrolysis in the conditions of sparking leads to the formation of anode coatings that exceed in their properties the films obtained by non-sparking oxidation. Comparative studies of the wear resistance of anode-spark coatings and galvanic anode coatings under the same test conditions showed that the wear of anode-spark coatings is almost twice lower for the entire load range. The considered technology is recommended for increase of wear resistance of elements of devices from the aluminum alloys working in the conditions of corrosion and mechanical wear.