PSI - Issue 65

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000–000

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Procedia Structural Integrity 65 (2024) 200–208

The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Influence of strain aging intensity on the kinetics of damage accumulation in structural steel under cyclic elastoplastic deformation A.N. Romanov* Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4 Maly Kharitonyevsky, Pereulok Moscow 101990, Russia Abstract The kinetics of damage accumulation in carbon steel 22k under low-cycle loading and intensive strain aging (270 0 C) has been experimentally investigated on the basis of the strain kinetic criterion of fatigue failure. It is shown that strain aging significantly reduces the plastic properties of the material, and the limit state is characterized by brittle catastrophic fracture. The force and deformation parameters characterizing the bearing capacity of materials and the conditions of their exhaustion under static and cyclic loading are proposed. The fairness of the application of the proposed fatigue fracture criterion to describe the kinetics of damage accumulation and limit states under low-cycle loading and intensive strain aging was confirmed. © 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) -review under responsibility of MRDMS 2023 organizers Keywords: Damage accumulation under low-cycle loading; strain aging; limit state; bearing capacity; strain-kinetic criterion. The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Influence of strain aging intensity on the kinetics of damage accumulation in structural steel under cyclic elastoplastic deformation A.N. Romanov* Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4 Maly Kharitonyevsky, Pereulok Moscow 101990, Russia Abstract The kinetics of damage accumulation in carbon steel 22k under low-cycle loading and intensive strain aging (270 0 C) has been experimentally investigated on the basis of the strain kinetic criterion of fatigue failure. It is shown that strain aging significantly reduces the plastic properties of the material, and the limit state is characterized by brittle catastrophic fracture. The force and deformation parameters characterizing the bearing capacity of materials and the conditions of their exhaustion under static and cyclic loading are proposed. The fairness of the application of the proposed fatigue fracture criterion to describe the kinetics of damage accumulation and limit states under low-cycle loading and intensive strain aging was confirmed. © 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) -review under responsibility of MRDMS 2023 organizers Keywords: Damage accumulation under low-cycle loading; strain aging; limit state; bearing capacity; strain-kinetic criterion. © 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

1. Introduction 1. Introduction

The kinetics of damage accumulation depend on the structural state of the material and the deformation conditions. Structural materials can be conditionally divided into strengthening, de-strengthening and stabilizing. When a hardening material is loaded with a given load amplitude (soft loading), the width of the hysteresis loop The kinetics of damage accumulation depend on the structural state of the material and the deformation conditions. Structural materials can be conditionally divided into strengthening, de-strengthening and stabilizing. When a hardening material is loaded with a given load amplitude (soft loading), the width of the hysteresis loop

* Corresponding author. Tel.: +7-916-426-1715. E-mail address: alrom37@mail.ru * Corresponding author. Tel.: +7-916-426-1715. E-mail address: alrom37@mail.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.2024.11.031