PSI - Issue 65

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Procedia Structural Integrity 65 (2024) 139–146

The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Full-scale strain gauge studies of structures under conditions of high temperatures and elastoplastic deformations Maslov S.V.* Blagonravov Mechanical Engineering Research Institute of Russian Academy of Science (IMASH RAN), 4 Maly Kharitonyevsky Pereulok, Moscow 101990, Russia The features of full-scale strain gauge studies of structures operated at temperatures up to 550 °C, in which local elastic-plastic deformations occur, are considered. A method for determining the creep of strain gauges based on measuring the output signals during cyclically varying deformation is considered. Algorithms for accounting for errors associated with the creep of strain gauges at nonstationary temperatures are proposed. An algorithm for calculating stresses based on measured deformations at variable elastic and elastic-plastic loading of the structure is determined. © 2024 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 MRDMS 2023 organizers Keywords: stress state; full-scale studies; tensometric measurements; creep of strain gauge; high temperature; variable loading. The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Full-scale strain gauge studies of structures under conditions of high temperatures and elastoplastic deformations Maslov S.V.* Blagonravov Mechanical Engineering Research Institute of Russian Academy of Science (IMASH RAN), 4 Maly Kharitonyevsky Pereulok, Moscow 101990, Russia Abstract The features of full-scale strain gauge studies of structures operated at temperatures up to 550 °C, in which local elastic-plastic deformations occur, are considered. A method for determining the creep of strain gauges based on measuring the output signals during cyclically varying deformation is considered. Algorithms for accounting for errors associated with the creep of strain gauges at nonstationary temperatures are proposed. An algorithm for calculating stresses based on measured deformations at variable elastic and elastic-plastic loading of the structure is determined. © 2024 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 MRDMS 2023 organizers Keywords: stress state; full-scale studies; tensometric measurements; creep of strain gauge; high temperature; variable loading. According to the established practice in the Russian Federation, when creating new power plants, the initial stage of their construction suggests full-scale strain-gauge studies of the stress-strain state (SSS) of the most loaded structural elements during commissioning tests and in real operation (Makhutov N.A. et al., 2018). Such studies are intended to verify the design decisions made, to comply with the criteria for the strength of materials under various operational loading conditions, and to identify and minimize factors affecting the life of the structure (Volkov I.A. et al., 2023; Alekseeva M.S. et al., 2023). In addition, strain gauge studies are aimed at constructing mathematical © 2024 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 MRDMS 2023 organizers Abstract 1. Introduction 1. Introduction According to the established practice in the Russian Federation, when creating new power plants, the initial stage of their construction suggests full-scale strain-gauge studies of the stress-strain state (SSS) of the most loaded structural elements during commissioning tests and in real operation (Makhutov N.A. et al., 2018). Such studies are intended to verify the design decisions made, to comply with the criteria for the strength of materials under various operational loading conditions, and to identify and minimize factors affecting the life of the structure (Volkov I.A. et al., 2023; Alekseeva M.S. et al., 2023). In addition, strain gauge studies are aimed at constructing mathematical

* Corresponding author. Tel.: +7-495-628-8730. E-mail address: maslovsv@inbox.ru * Corresponding author. Tel.: +7-495-628-8730. E-mail address: maslovsv@inbox.ru

2452-3216 © 2024 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 MRDMS 2023 organizers 2452-3216 © 2024 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 MRDMS 2023 organizers

2452-3216 © 2024 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 MRDMS 2023 organizers 10.1016/j.prostr.2024.11.022