PSI - Issue 47

ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 47 (2023) 513–520

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Abstract A shell of revolution is considered, consisting of spherical, toroidal, and cylindrical shell elements under the combined action of internal pressure and mechanochemical corrosion. The shell material is supposed to be elastic. Geometrically nonlinear equations of axisymmetric deformation of shells are used to calculate the stress-strain state. Due to corrosion, the thickness of the shells decreases, which, in turn, leads to an increase in stresses. Since the rate of mechanochemical corrosion depends on stresses along the shell surfaces, an increase in stresses is accompanied by an increase in the corrosion rate. Junction of shells of different shapes causes strong non-uniformity of the stress state in the vicinity of junction. This may lead to acceleration of corrosion in places with higher stresses and, thus, reduce the service life of the shell. In this paper, we built the dependence of the shell lifetime on the radius of the torus which provides a smooth transition from the spherical part of the shell to the cylindrical. © 2023 The Authors. Published by ELSE VIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: mechanochemical corrosion; nonlinear axisymmetric deformation; shells; pressure vessel 1. Introduction Thin-walled structures are widely used in various industries and are often exposed to pressure of corrosive working media. Mechanical stresses occurring in the structures may accelerate chemical reactions with working media and other phase transformations in materials (see Abakarov and Pronina (2022), Anguiano et al. (2022), Awrejcewicz et al. (2020), Butusova et al. (2020), Gutman (1994), Javadi et al. (2020), Javanbakht and Ghaedi (2020), Kazemian et al. (2022), Song (2020), Wee et al. (2022), Xia et al. (2021)). Calculation of the service life of structural elements under conditions of general corrosion accelerated by stress (i.e. mechanochemical corrosion) has been conducted by many scientists. Most of such works are devoted to uniform corrosion of cylindrical and spherical 27th International Conference on Fracture and Structural Integrity (IGF27) Nonlinear axisymmetric deformation of compound shells of revolution under conditions of mechanochemical corrosion Sergei Kabrits a *, Evgeni Kolpak a a Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia Abstract A shell of revolution is considered, consisting of spherical, toroidal, and cylindrical shell elements under the combined action of internal pressure and mechanochemical corrosion. The shell material is supposed to be elastic. Geometrically nonlinear equations of axisymmetric deformation of shells are used to calculate the stress-strain state. Due to corrosion, the thickness of the shells decreases, which, in turn, leads to an increase in stresses. Since the rate of mechanochemical corrosion depends on stresses along the shell surfaces, an increase in stresses is accompanied by an increase in the corrosion rate. Junction of shells of different shapes causes strong non-uniformity of the stress state in the vicinity of junction. This may lead to acceleration of corrosion in places with higher stresses and, thus, reduce the service life of the shell. In this paper, we built the dependence of the shell lifetime on the radius of the torus which provides a smooth transition from the spherical part of the shell to the cylindrical. © 2023 The Authors. Published by ELSE VIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: mechanochemical corrosion; nonlinear axisymmetric deformation; shells; pressure vessel 1. Introduction Thin-walled structures are widely used in various industries and are often exposed to pressure of corrosive working media. Mechanical stresses occurring in the structures may accelerate chemical reactions with working media and other phase transformations in materials (see Abakarov and Pronina (2022), Anguiano et al. (2022), Awrejcewicz et al. (2020), Butusova et al. (2020), Gutman (1994), Javadi et al. (2020), Javanbakht and Ghaedi (2020), Kazemian et al. (2022), Song (2020), Wee et al. (2022), Xia et al. (2021)). Calculation of the service life of structural elements under conditions of general corrosion accelerated by stress (i.e. mechanochemical corrosion) has been conducted by many scientists. Most of such works are devoted to uniform corrosion of cylindrical and spherical 27th International Conference on Fracture and Structural Integrity (IGF27) Nonlinear axisymmetric deformation of compound shells of revolution under conditions of mechanochemical corrosion Sergei Kabrits a *, Evgeni Kolpak a a Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia

* Corresponding author. Tel.: +7-812-428-4492; fax: +7812-428-7159. E-mail address: s.kabrits@spbu.ru * Corresponding author. Tel.: +7-812-428-4492; fax: +7812-428-7159. E-mail address: s.kabrits@spbu.ru

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 10.1016/j.prostr.2023.07.073