This paper presents the results of an investigation of the possibility of the reliable determination of the residual stress–strain state in polymers and composites using a combination of bridge curvature, optical scanning, and finite element methods. A three-factor experiment was conducted to determine the strength of printed PLA plastic products. The effect of the residual stresses on the strength of the printed products was evaluated. By comparing the values of the same strength stresses, a relationship between the nature of the stresses and the strength of the samples was found. A tendency of the negative influence of tensile stresses and the opposite strengthening effect of compressive stresses was obvious, so at the same values of tensile strength, the value of residual stress of 42.9 MPa is lower than that of the fibre compression at the value of 88.9 MPa. The proposed new methods of the residual stress determination allow obtaining a complete picture of the stressed state of the material in the investigated areas of the products. This may be necessary in confirming the calculated models of the residual stress–strain state, clarifying the strength criteria and assessing the quality of the selected technological modes of manufacturing the products.

The design of a new diverting roller table is presented, containing continuous series of sections with diverting rollers. Using the program product of finite element analysis of Autodesk Inventor, the stress-strain state rollers of the new outrigger roller table is calculated. It is proved that the maximum concentrations of stresses and deformations are observed in barrels and necks of rollers a new outrigger roller table. At the same time, the value of these indices is much smaller in comparison with the values of stresses and deformations occurring in existing roller tables.

This section analyzes the current state of passenger transportation in Ukraine and evaluates the main sources of its financing. It has been found that in addition to traditional problems with insufficiency of financial resources, the activities of the enterprises have caused the consequences of war. In particular, the volume of passenger transportation decreased by 47.2 % compared to the pre-war 2021. Transport infrastructure lost part of the functional capacity. The fall of passenger income has further aggravated the situation. In view of these challenges, the relevance of the development of the strategy of financial support for the functioning of passenger transport enterprises is substantiated. The proposed strategy is based on the principles of sustainable development, which provide for a harmonious combination of economic, social and environmental aspects. The study defines the key stages of formation of a comprehensive strategy for financing transport enterprises. Its implementation will help to create a high quality, environmentally friendly and socially responsible transport system. This will not only improve the quality of services and ensure the financial stability of enterprises, but also contribute to the overall socio-economic development of the country, maintaining the balance between economic benefits, citizens' needs and environmental protection.

The classical equations of plate bending in various fastenings along the contour and various loads are considered. Using the decomposition method, three auxiliary problems are formulated to determine the deflection of the plate. The task is to determine the individual terms of the decomposition coefficients a n m i from the individual terms of the load series. Then the system of algebraic equations is obtained to determine a n m i . If the plate contour is pivotally fixed along the contour, then the system of equations takes a known form and the expression for the deflection function is explicitly found. Approximate analytical solutions are obtained for the functions of deflections, internal force factors and stresses under various boundary conditions of the plate.

This paper explores modern approaches to introducing robotic automation in the production of power distribution transformers within the Industry 4.0 framework. It identifies the key manufacturing stages where industrial robots provide the greatest efficiency, including electrical steel cutting, coil winding, magnetic core assembly, insulation application, tank welding, and quality control. Particular attention is given to integrating robotic systems with digital manufacturing management platforms, as well as using sensors, machine vision, and real-time monitoring technologies. The findings show that robotic automation significantly improves precision and operational consistency, reduces production cycle time by approximately 30–40%, lowers defect rates from 5–7% to 2–3%, and decreases overall manufacturing costs by 15–20%. Additional benefits include improved energy efficiency, enhanced workplace safety, reduced occupational injuries, optimized resource use, and minimized human error. The study concludes that implementing robotics in transformer manufacturing establishes a foundation for smart factories and fully automated intelligent production systems driven by digitalization, big data, artificial intelligence, and predictive maintenance.

The application of a specially developed metal composite material using LDPE polymer as a binder in additive technology is described. Nitrogen environments can facilitate the formation of chromium nitride (Cr2N), particularly at temperatures between 500-600°C, adversely affecting the material's corrosion resistance. Following binder removal, the sintering process involves heating the loosely packed particles to a temperature between 70-90% of the metal powder's melting point, facilitating the powder's dense fusion and consolidation. In the metallographic study, the austenitic grain structure was shown, and the average size was 7±3 μm. Using this raw material in additive technology, a sample was developed and annealing and ripening processes were carried out in a hydrogen atmosphere up to 1387°C based on the removal of the binder in the developed sample. Complete degradation of the polymer was achieved at 500°C, with residual mass percentage (R) analysis from TGA curves revealing 94.5% steel powder, which corresponds to the expected 94.2% mass composition. Phase analysis showed the presence of an austenitic phase, which confirmed that treatment in a hydrogen-reducing atmosphere effectively protected the samples from oxidation and additional impurities. The uncontrolled cooling rate was quite slow (1-2°C/min), which allowed the powder to continue growing until it reached the recrystallization point. As a result of the microstructure analysis of the prepared sample, a level of 250 MPa and a nano-indentation hardness of 4.87 GPa were achieved. Density after sintering is 91-93%.