Automatic Welding, 2023, №05



2023 №05 (03)

DOI of Article 10.37434/as2023.05.04

2023 №05 (05)

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Avtomaticheskaya Svarka (Automatic Welding), #5, 2023, pp. 37-43

A numerical method of multiscale modeling of the stress-strain state of large-sized sctructures in site welding

O.S. Milenin, O.A. Velikoivanenko, G.P. Rozynka, N.I. Pivtorak

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

A multiscale procedure was proposed for modeling the kinetics of stress-strain state of large-sized structures during site welding. This procedure is based on finite-element solution of nonstationary thermoplasticity problems, characteristic for fusion welding technologies, at the mesoscale level with fine spatial breakdown of the region and with subsequent transfer of a certain amount of calculation data into a macroscopic model of a large-scale structure. Algorithms of the respective averaging of the properties and stress-strain state parameters are proposed for this purpose, which allows performing analysis of large-sized structures during welding without the need to involve significant computing power. A characteristic example of site welding of a cylindrical structure of a large diameter is used to show the applicability of the developed approach for prediction of spatial distribution of stresses and strains. Here, the most effective method is calculation of the stress fields, where a much greater sparseness of the spatial breakdown can be achieved, while calculation of the strained state is much more sensitive to finite element size. 14 Ref., 3 Fig.
Keywords: large-sized structures, welding, stress-strain state, mathematical modeling, multiscale method, resource intensity of calculation


Received: 03.04.2023

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