Друковані видання.Факультет інженерно-технологічний

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https://dspace.pdau.edu.ua/handle/123456789/28

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Перегляд Друковані видання.Факультет інженерно-технологічний за Автор "Goryk, O. V."

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  • Ескіз
    Публікація
    Determination of the efficiency of shot blasting of metal surfaces
    (2025) Горик, Олексій Володимирович; Goryk, O. V.; Брикун, Олександр Миколайович; Brykun, O. M.; Kalashnykov, O.; Buchynskyi, A.
    The object of this research is the process of transformation of kinetic energy of the attacking air-abrasive torch in the process of dynamic impact on metal surfaces of products during their shot blasting. The importance of the research is due to the need to solve the problem of increasing the efficiency of the technological process of preparing metal surfaces of products by shot blasting for the subsequent application of protective, stable non-metallic coatings. In the work, based on the energy balance of the "shot-obstacle" system, a method for determining the efficiency coefficient of the shot blasting surface preparation process was developed, which was associated with the torch energy recovery coefficient. The relationship of the coefficients with the potential energy of the surface layer accumulated in the process of elastic deformation was established. The depth of the hole formed by the shot on the surface of the attacked body was taken as a measure of this energy. When determining the depth of the hole, the deformation of an elementary cylindrical element clamped in the surface layer of the attacked body was considered, the dimensions of which are compatible with the dimensions of the elastic deformation hole. The classical recovery coefficient is not a characteristic criterion for revealing the physical aspects of the complex multifactorial shot blasting process. The ease of application in practical calculations, especially when establishing the productivity of the process, prompts the search for improving the methods of its determination, since the existing models of an ideal impact in this case are not capable. This coefficient at average attack speeds of 100–120 m/s and angles of 40° < α < 70° turned out to be 15–20% less than the classical one. The obtained research results can be used to increase the productivity of the shot blasting process of products of the defense, agricul tural, machine-building, chemical, aviation and other industries.
  • Ескіз
    Документ
    Integral and differential relations for internal power factors in the bending of the bar with a curved flat axis of an arbitrary shape
    (Odessa State Academy of Civil Engineering and Architecture, 2018-03) Kovalchuk, S. B.; Goryk, O. V.; Ковальчук, Станіслав Богданович; Горик, Олексій Володимирович
    The work is dedicated to the theoretical study of internal power factors in a curved bar with a flat axis of an arbitrary shape, that is in a plane bending condition by a surface load of an arbitrary type. The natural curvilinear cylindrical orthogonal coordinates associated with the structure of the bar and given by the characteristics of families of coordinate surfaces and Lame coefficients is used to describe the geometry of the bar and also the load distribution. The analysis of the equilibrium conditions of the elementary section of the bar made it possible to obtain integral relations between internal power factors and loads distributed on its longitudinal and end surfaces. The relations obtained were used to derive differential dependencies between internal power factors, that express the equilibrium conditions for the elementary section of a curved bar. Also, based on the equilibrium conditions of the bar cross-sections, integral relations between internal power factors and the stress state components were obtained. The presented integral and differential relations have a general form, invariant to the shape of the axis of the bar and allow to make a direct connection between loads and stresses. The results of the work can be used to solve theoretical and applied problems of a plane bending of curvilinear homogeneous and inhomogeneous bars with different types and combinations of external load.
  • Ескіз
    Документ
    Stability of Individual Phases in the Elastic Matrix of a Composite
    (2023) Goryk, O. V.; Kovalchuk, S. B.; Muravlov, V. V.; Skoriak, Yu. B.; Горик, Олексій Володимирович; Ковальчук, Станіслав Богданович; Муравльов, Володимир Вячеславович; Скоряк, Юлія Борисівна
    A methodology for analytical stability assessment of individual compressed flexible phases of discretely heterogeneous composite elements of engineering structures is proposed to ensure their reliable safe operation and minimise the consequences of emergencies. Based on the energy balance equation for the proportional forces of a normal resistance of the medium to the phase displacement, expressions are obtained for determining the critical force, taking into account the possible initial curvature (non-rectilinearity) of a single phase in the elastic medium of the matrix for three possible cases of stability loss. The approbation of the results of the study on the example of deformation features of reinforcing bars in a compressed reinforced concrete column is presented.