Browsing by Author "Dolzhanskiy, Anatoliy M."

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Application of Dimensional Analysis for Stable Dry Drawing Process Designing
(Інститут металофізики ім. Г. В. Курдюмова НАН України, Київ; Видавничий дім "Академперіодика", 2022) Dolzhanskiy, Anatoliy M.; Mospan, N. M.; Bondarenko, O. A.
ENG: Using the analysis of dimensions, the generalized method of designing rational modes of multiple drawing of wire with dry soapy technological lubricant is improved theoretically and experimentally, taking into account the friction mode in the drawers, other process parameters and determining the acceptable multiplicity of metal flow deformation in the mill. An algorithm is developed for calculating the rational number of rods passes through the dies during flow drawing, the use of which allows, in its implementation in practice, to ensure the stability of the technological process with the absence of wire breaks with the minimum necessary (optimal) number of metal deformation cycles and the corresponding energy consumption. The obtained results are consistent with the practice of industrial drawing with the use of dry technological lubricants on a soap base and can be used in the development of new ones and in checking the rationality of existing technological drawing processes. In the future, it is advisable to develop a program for automatic calculation according to the above algorithm for the rational number of passes during dry drawing, as well as use the presented approach to expand the initial statistical database, taking into account the properties of other steel grades that are deformed in the processes of dry and wet drawing.
Evaluation of Components Uncertainty in Composite Material Wear Resistance
(Publisher House of Lviv Polytechnic National University, Lviv, 2025) Chornoivanenko, Kateryna O.; Dolzhanskiy, Anatoliy M.
ENG: Accurately estimating measurement uncertainty is crucial for reliable and meaningful results in material abrasive wear resistance testing. In general, the process of assessing uncertainty involves several steps, including identifying sources of uncertainty, determining correlations between input quantities, and calculating various types of uncertainties. Knowing the measurement uncertainty allows for: ensuring compliance with established standards, monitoring and improving the accuracy and reliability of the testing process. The components of the measurement uncertainty of abrasive wear resistance are studied in detail in the paper. It is revealed that indirect factors can have a predominant effect on the total uncertainty of the method. The methodology for assessing uncertainty should be described in regulatory documents to ensure consistency and comparability across different testing laboratories. By incorporating uncertainty assessment into abrasive wear resistance testing, researchers and engineers can improve the quality and reliability of their results, leading to better decision-making in materials selection and process optimization.