Technology, energy, agriculture transport AIC

Mykola KOLISNYK – Doctor of Philosophy in Materials Science, Senior Lecturer Department of Electric Power Engineering, Electrical Engineering and Electromechanics, Vinnitsa National Agrarian University (3, Solnechna str., Vinnitsa, 21008, Ukraine, email: kolisnik30@gmail.com, https://orcid.org/0000-0001-5502-6556). 

The article presents a comprehensive analysis of the influence of direct extrusion by rolling stamping on the stress-strain state (SST) of the workpiece material with an emphasis on the formation of complex-profile end elements. The features of localized plastic deformation in the zones of contact with the tool are considered, as well as the mechanisms of material flow during the implementation of technological schemes with non-standard tool geometry. The study uses physical modeling using a copper workpiece of the M0b brand, on the surface of which a dividing grid was applied to fix the trajectories of material point movement. Microstructural analysis and microhardness measurements are performed in order to spatially localize the zones of maximum deformation intensity. 
The results showed a clear localization of plastic deformations in the surface layers of the workpiece, which is accompanied by grain compaction and their orientation in the direction of the main deformation. In the central zones, the material retains a more homogeneous structure. The asymmetry of the NDS is established, caused by the asymmetric application of the load, which affects the geometry of the extruded profile. The dependence of the NDS characteristics on the tool shape, extrusion depth and friction conditions is revealed. 
An approach to describing the stress state in the deformation zone is proposed, taking into account equilibrium equations, plasticity conditions and hardening curves. The deformation paths of material particles in critical zones are determined using coordinate grids and the theory of R-functions. The obtained data allow predicting limit states and optimizing process parameters. The study demonstrates the prospects of the direct extrusion method by rolling for the manufacture of high-precision complex-profile elements with controlled structural inheritance.
The findings provide a scientific basis for optimizing tool geometry and process parameters to achieve controlled stress–strain distribution and desired structural properties. The proposed approach enhances understanding of localized plastic deformation and supports the development of high-precision complex-profiled elements.

1.    Matvijchuk, V., Shtuts, A., Kolisnyk, M., Kupchuk, I., & Derevenko, I. (2022). Investigation of the tubular and cylindrical billets stamping by rolling process with the use of computer simulation. Periodica Polytechnica Mechanical Engineering, 66(1), 51–58. [in English].
2.    Matviychuk, V.A., Kolisnyk, M.A., & Shtuts, A.A. (2022). Construction of curve boundary deformations of materials. Vibrations in Engineering and Technology, 2(105), 84–90. [in Ukrainian].
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4.    Mykhalevych, V.M., Kolisnyk, M.A., & Shtuts, A.A. (2025). Study of the stress–strain state of the material of the blanks during plastic stamping by rolling. Metallophysics and Advanced Technologies, 47(1), 57–81. [in Ukrainian].
5.    Matviychuk, V., & Shtuts, A. (2022). Construction of curve boundary deformations of metals. In Traditional and innovative approaches to scientific research: Theory, methodology, practice (pp. 90–113). Baltija Publishing. [in English].
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8.    Shtuts, A., Kolisnyk, M., Vydmysh, A., Voznyak, O., Baraban, S., & Kulakov, P. (2020). Improvement of stamping by rolling processes of pipe and cylindrical blades on experimental research. Key Engineering Materials, 844, 168–181. [in English].
9.    Mykhalevych, V.M., Dobranyuk, Yu.V. (2010). Model of material plastic deformation on the free surface of cylindrical specimens during axisymmetric upsetting. Part 1. Approximation of deformations. Bulletin of Vinnytsia Polytechnic Institute, (2), 97–102. [in Ukrainian].
10.    Matviychuk, V. A., & Kolisnyk, M. A. (2021). Development of a technological process for forming wide flanges on sheet blanks by stamping by rolling. Engineering, Energy, Transport AIC, 1(112), 38–45. [in Ukrainian].
11.    Mykhalevych, V. M., & Dobranyuk, Yu. V. (2015). Analytical representation of the maximum radius of cylindrical blanks during axisymmetric upsetting with barreling. Bulletin of Mechanical Engineering and Transport, (1), 59–66. [in Ukrainian].
12.    Matviychuk, V.A., Kolisnyk, M.A., & Liubin, M.V. (2018). Development and study of rolling stamping processes for complex-profiled blanks. Engineering, Energy, Transport AIC, 4(103), 56–63. [in Ukrainian].
13.    Mykhalevych, V.M., & Dobranyuk, Yu.V. (2015). Analytical description of the form change dynamics of cylindrical blanks during face compression. Bulletin of the National Technical University “KhPI”. Special Issue: New Solutions in Modern Technologies, (47), 53–56. [in Ukrainian].
14.    Matviychuk, V., & Kolisnyk, M. (2021). Development of the combined technological process of blank stacks flanges formation by the method of stamping by rolling and rotary drawing. Vibrations in Engineering and Technology, 1(100), 111–121. [in Ukrainian].
15.    Matviychuk, V.A., Mykhalevych, V.M., & Krayevskyi, V.O. (2015). Development of cold face rolling processes considering the effect of technological parameters on metal flow direction. Vibrations in Engineering and Technology, (2), 92–96. [in Ukrainian].
16.    Mykhalevych, V.M., Dobranyuk, Yu.V. (2011). Approximation of relationships between strain components on the side surface of a cylindrical specimen during face compression (Certificate of copyright registration №. 38309). [in Ukrainian].