Vibrations in engineering and technology

Nevdakha Yurii - Associate Professor, PhD in Engineering, Associate Professor of the Department of Machine Parts and Applied Mechanics, Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, e-mail: uanevdakha@ukr.net, (066) 5249790, https://orcid.org/0000-0003-4355-4065

Skrypnyk Oleksandr - Associate Professor, PhD in Engineering, Associate Professor of the Department of Materials Science and Foundry, Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, e-mail: skripnik1966@ukr.net, (095) 0278011, https://orcid.org/0000-0002-5735-0648,

Nevdakha Nataliia - head of the Educational Laboratory of the Department of Materials Science and Foundry, Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, e-mail: natalian65@ukr.net, (095) 9048267, https://orcid.org/0009-0004-9841-4216,

Riabovolyk Yaroslav - applicant for higher education at the first (bachelor's) level of higher education in the specialty G9 "Applied Mechanics", Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, e-mail: Ryabovolik@ ukr.net, (097) 8275939, https://orcid.org/0009-0003-6367-7182

The article investigates the stress-strain state of a thin-walled cylindrical pressure vessel with smoothly joined spherical heads operating under internal overpressure. The structural configuration of the sealed vessel, formed by sheet elements connected by longitudinal and circumferential leak-tight riveted joints, is considered, and a verification calculation of its main components is performed. The study generalizes contemporary approaches to the analysis of riveted joints with due regard to strength conditions, tightness, preload compressive forces, and the characteristic features of possible failure, which made it possible to substantiate the expediency of using such joints in critical pressure-loaded structures.

Based on the principles of strength of materials for thin-walled shells, the regularities of membrane stress distribution in the vessel walls were determined as a function of the shell geometry, wall thickness, and radii of curvature. It is shown that in the cylindrical part of the vessel, the stress in the longitudinal section is twice as high as that in the circumferential section; consequently, the longitudinal riveted joints are the most heavily loaded and should be regarded as the governing elements in calculations under internal pressure. A sequence for the verification calculation of riveted joints is presented, including the selection of the joint type, determination of the required wall thickness, evaluation of the joint efficiency coefficient, selection of the rivet diameter, and verification of the joint with respect to shear, bearing, and tightness.

Two possible design variants of this joint were considered, and it was established that the more rational solution is the one in which the cylindrical shell is arranged as an internal element relative to the head. Such a design promotes higher tightness of the circumferential joint, reduces the influence of local compressive forces in the transition zone, and improves the overall reliability of the structure. The obtained results can be used in the design, calculation, and improvement of sealed thin-walled pressure vessels operating under internal pressure.

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