PSI - Issue 41

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Procedia Structural Integrity 41 (2022) 544–549

2nd Mediterranean Conference on Fracture and Structural Integrity Adiabatic shear failure mechanism in AlMg alloys Alexander Inozemtsev c , Oleg Naimark a , Mikhail Sokovikov a 1 , Sergey Uvarov a , Mikhail Simonov b , Vladimir Oborin a , Vasiliy Chudinov a , Ivan Gladky c e iterra ea fere ce ract re a tr ct ral I te rit i ti r f il r i i l ll Al r I ts c , l Nai r a , i il i a 1 , r r a , i il Simonov b , Vladimir Oborin a , siliy Ch i a , I l 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 Komsomolsky prospect , Perm, 614990, Russia c Joint-Stock Company «UEC-Aviadvigatel», 93 Komsomolsky prospect, Perm 614990, Russia a Institute of Continuous edia echanics of the ral Branch of the Russian Acade y of Sciences, 1 Ak. Korolev Street, Per , 614013 , Russia b Per National Research Polytechnic niversity, 29 Ko so olsky prospect , Per , 614990, Russia c Joint-Stock Co pany « EC-Aviadvigatel», 93 Ko so olsky prospect, Per 614990, Russia

© 2022 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 MedFract2Guest Editors. The data of experimental studies, the examination of the structure of deformed samples, as well as the data of numerical modeling taking into account the kinetics of accumulation of microdefects in the material suggest that one of the mechanisms of plastic strain localization at high loading rates is associated with the jump-like processes in the defect ensemble with pronounced orientation. The te perature easured in the localization zone does not confir the generally accepted concept of the strain localization echanis as the echanis governed by a ther oplastic instability. The sa ples stored after the experi ent ere subjected to icrostructural analysis, using an optical interfero eter-profilo eter and a scanning electron icroscope. The structural analysis revealed a correlated behavior of the ense ble of defects, hich can be classified as a structural transition providing strain localization. The data of experi ental studies, the exa ination of the structure of defor ed sa ples, as ell as the data of nu erical odeling taking into account the kinetics of accu ulation of icrodefects in the aterial suggest that one of the echanis s of plastic strain localization at high loading rates is associated ith the ju p-like processes in the defect ense ble ith pronounced orientation. Abstract The purpose of this work is to provide theoretical framework and experimental supporting evidence for a crucial role of structural transitions in the ensemble of defects at the meso-level (microshears and microcracks), as one of the mechanisms of plastic strain localization in metals under high-rate loading. The investigation of the sample response to dynamic loading was carried out on the split Hopkinson pressure bar and in a series of target penetration tests. To identify the characteristic stages of strain localization, the thermodynamics of the deformation process was investigated "in-situ" by recording the temperature fields using a high-speed infrared camera CEDIP Silver 450M. The temperature measured in the localization zone does not confirm the generally accepted concept of the strain localization mechanism as the mechanism governed by a thermoplastic instability. The samples stored after the experiment were subjected to microstructural analysis, using an optical interferometer-profilometer and a scanning electron microscope. The structural analysis revealed a correlated behavior of the ensemble of defects, which can be classified as a structural transition providing strain localization. bstract The purpose of this ork is to provide theoretical fra e ork and experi ental supporting evidence for a crucial role of structural transitions in the ense ble of defects at the eso-level ( icroshears and icrocracks), as one of the echanis s of plastic strain localization in etals under high-rate loading. The investigation of the sa ple response to dyna ic loading as carried out on the split opkinson pressure bar and in a series of target penetration tests. To identify the characteristic stages of strain localization, the ther odyna ics of the defor ation process as investigated "in-situ" by recording the te perature fields using a high-speed infrared ca era E IP Silver 450 .

1 Corresponding author. Tel.: +7-342-237-8389; fax: +7-342-237-8487 E-mail address: sokovikov@icmm.ru 1 Corresponding author. Tel.: +7-342-237-8389; fax: +7-342-237-8487 E- ail address: sokovikov ic .ru

2452-3216 © 2022 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 MedFract2Guest Editors. 2452-3216 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC B - C- license ( https://creativeco ons.org/licenses/by-nc-nd/4.0 ) Peer-revie under responsibility of the edFract2 uest Editors.

2452-3216 © 2022 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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.062