PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDir ct Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

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Procedia Structural Integrity 33 (2021) 1082–1088

© 2021 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 IGF ExCo Abstract The aim of the paper is to investigate the influence of the non-monotonic loading and short stops on the spatial-time inhomogeneity due to the jerky flow in the Al-Mg alloy. Experimental study on the regularities of inhomogeneous deformation and the processes of macroscopic localization of the plastic flow due to the Portevin-Le Chatelier effect was carried out. Using the digital image correlation technique the data on the initiation and propagation of the strain bands were obtained. Experimental data were obtained that show the effect of short-term stops and non-monotonic loading on the regularities of inelastic deformation of the Al-Mg alloy when the PLC effect manifests itself. Short stops decrease the level of critical strain when the jerky flow starts. Non-monotonic tests led to a change in the type of the PLC effect and a change in the regularities of the spatial-time inhomogeneity of plastic flow. © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Jerky flow; the Portevin-Le Chatelier effect; digital image correlation; strain localization; aluminum-magnesium alloy. 1. Introduction Real conditions of operation and complex external thermomechanical influences determine the operation of the loaded elements of critical structures in the conditions of a complex stress state and under non-monotonic loading. There is a need to create the scientific basis for predicting the deformation ability and the limiting state of metals and alloys, taking into account the phenomena of spatial heterogeneity and temporary instability of plastic deformation IGF26 - 26th International Conference on Fracture and Structural Integrity Influence of the non-monotonic loading and short stops on the regularities of the jerky flow in the Al-Mg alloy Tatyana Tretyakova, Mikhail Tretyakov* Center of Experimental Mechanics of Perm National Research Polytecnic University, 29, Komsomolskiy Ave., Perm, 614990, Russia Abstract The aim of the paper is to investigate the influence of the non-monotonic loading and short stops on the spatial-time inhomogeneity du to the jerky flow in the Al-Mg alloy. Exp rimental study on the regularit es of inhomogene us d formation and t e processes of macroscopic local za ion of the p astic flow due to the Portevin-Le Cha elier effect was carrie out. Us ng the digital image correlati n technique the data on the ini ation an propagation of the strain bands were obt ined. Experimental data were obtained that show th effect of short-term stops and on-mon tonic l ading on the regulariti s of inelastic defor ation of he Al-Mg lloy when the PLC effect manifests itself. Short stops decrease the level of critical stra n whe the jerky flow starts. Non-monotonic tests led to a change in the type of the PLC effect and a change in th regularities of the spatial-time inhomogeneity of plastic flow. © 2021 The Authors. Publish d 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 Statement: Peer-revi w under responsibility of the scientific committee of the IGF ExCo K ywords: Jerky flow; the ortevin-Le Chatelier ffect; digital image correlation; strain localization; aluminum-magnesium alloy. 1. Introduction Real conditions of operation and complex external thermomechanical influences determine the operation of the load d elements of critical structures in the conditions of a c plex stress stat and under non-monotonic loading. Ther is a ne d to crea e the scientific basis for predicting the deformation abili y the limiti g state f metals and alloys, taking int account the phenomena of s atial heterogeneity and temporary instability of plastic deformation IGF26 - 26th International Conference on Fracture and Structural Integrity Influence of the non-monotonic loading and short stops on the regularities of the jerky flow in the Al-Mg alloy Tatyana Tretyakova, Mikhail Tretyakov* Center of Experimental Mechanics of Perm National Research Polytecnic University, 29, Komsomolskiy Ave., Perm, 614990, Russia

* Tatyana Tretyakova. Tel.: +7-342-2198-732. E-mail address: cem.tretyakova@gmail.com * Tatyana Tretyakova. Tel.: +7-342-2198-732. E-mail address: cem.tr tyakova@gmail.com

2452-3216 © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 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 Statement: Peer-revi w under responsibility of the scientifi committee of the IGF ExCo

2452-3216 © 2021 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 IGF ExCo 10.1016/j.prostr.2021.10.120