PSI - Issue 50

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

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Procedia Structural Integrity 50 (2023) 119–124

© 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 scientific committee of the MRDMS 2022 organizers Abstract This work is devoted to the substantiation of one of the mechanisms of plastic strain localization under conditions of high-rate dynamic loading associated with jump-like processes in the defect structure of materials. The specimen behavior under dynamic loading was investigated using a split Hopkinson pressure bar. In order to identify the characteristic stages of strain localization, we performed in-situ thermodynamical studies of the deformation process by recording temperature fields with the CEDIP Silver 450M high-speed infrared camera. The temperature measurements made in the zone of strain localization do not support the wide-spread idea that the strain localization mechanism is caused by thermoplastic instability. Dynamic tests were carried out for specimens, which were specially designed to study plastic strain localization in AlMg6 alloy under conditions of dynamic loading on the split Hopkinson pressure bar using the StrainMaster strain measurement system. The specimens after the experiment were subjected to microstructural analysis using an optical interferometer-profile meter and a scanning electron microscope. The structural analysis revealed the correlated behavior of defect ensembles, which can be classified as a structural transition facilitating strain localization. Experimental data, examination of deformed specimen structure and data of numerical simulation with consideration for kinetics of microdefect accumulation in the material allow us to infer that one of the mechanisms of plastic strain localization at high loading rates is caused by jump-like processes in the defect ensembles. © 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 scientific committee of the MRDMS 2022 organizers Keywords: Plastic shear localization, dynamic loading, numerical simulation, evolution of the defect structure, structural studies ; 16th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures (MRDMS 2022) The study of mechanism of localized shear fracture in AlMg6 alloy under dynamic loading on a split Hopkinson pressure bar Alexander Inozemtsev c , Oleg Naimark a , Mikhail Sokovikov a *, Sergey Uvarov a , Mikhail Simonov b , Vladimir Oborin a , Vasiliy Chudinov a , Ivan Gladky c a Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, 1 Ak. Korolev Street, Perm, 614013, Russia b Perm National Research Polytechnic University, 29 Komsomolskij Avenue, Perm, 614990, Russia c UEC-Aviadvigatel, 93, Komsomolsky prospect, Perm 614990, Russia Abstract This work is devoted to the substantiation of one of the mechanisms of plastic strain localization under conditions of high-rate dynamic loading associated with jump-like processes in the defect structure of materials. The specimen behavior under dynamic loading was investigated using a split Hopkinson pressure bar. In order to identify the characteristic stages of strain localization, we performed in-situ thermodynamical studies of the deformation process by recording temperature fields with the CEDIP Silver 450M high-speed infrared camera. The temperature measurements made in the zone of strain localization do not support the wide-spread idea that the strain localization mechanism is caused by thermoplastic instability. Dynamic tests were carried out for specimens, which were specially designed to study plastic strain localization in AlMg6 alloy under conditions of dynamic loading on the split Hopkinson pressure bar using the StrainMaster strain measurement system. The specimens after the experiment were subjected to microstructural analysis using an optical interferometer-profile meter and a scanning electron microscope. The structural analysis revealed the correlated behavior of defect ensembles, which can be classified as a structural transition facilitating strain localization. Experimental data, examination of deformed specimen structure and data of numerical simulation with consideration for kinetics of microdefect accumulation in the material allow us to infer that one of the mechanisms of plastic strain localization at high loading rates is caused by jump-like processes in the defect ensembles. © 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 scientific committee of the MRDMS 2022 organizers Keywords: Plastic shear localization, dynamic loading, numerical simulation, evolution of the defect structure, structural studies ; 16th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures (MRDMS 2022) The study of mechanism of localized shear fracture in AlMg6 alloy under dynamic loading on a split Hopkinson pressure bar Alexander Inozemtsev c , Oleg Naimark a , Mikhail Sokovikov a *, Sergey Uvarov a , Mikhail Simonov b , Vladimir Oborin a , Vasiliy Chudinov a , Ivan Gladky c a Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, 1 Ak. Korolev Street, Perm, 614013, Russia b Perm National Research Polytechnic University, 29 Komsomolskij Avenue, Perm, 614990, Russia c UEC-Aviadvigatel, 93, Komsomolsky prospect, Perm 614990, Russia

* Corresponding author. Tel.: +7-342-237-8389; fax: +7-342-237-8487. E-mail address: sokovikov@icmm.ru * Corresponding author. Tel.: +7-342-237-8389; fax: +7-342-237-8487. E-mail address: sokovikov@icmm.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 scientific committee of the MRDMS 2022 organizers 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 scientific committee of the MRDMS 2022 organizers

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 scientific committee of the MRDMS 2022 organizers 10.1016/j.prostr.2023.10.030