PSI - Issue 18

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

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Procedia Structural Integrity 18 (2019) 837–842

25th International Conference on Fracture and Structural Integrity Investigation of the Portevin-Le Chatelier effect in metals under additional vibration impact by using the DIC-technique and the IR-analysis Tatyana Tretyakova a *, Valery Wildemann a , Mikhail Tretyakov a a Centre of Experimental Mechanics, Perm National Research Polytechnic University, 29 Komsomolsky AVE, Perm 614990, Russia Abstract In the present work, the deformation processes and local heating were analyzed by the digital image correlation technique and the infrared thermography accordingly to characterize the spatial-time inhomogeneity associated with the Chernov-Lüders behavior and the Portevin-Le Chatelier (PLC) effect in metals. To estimate the influence of the additional vibration impact on the serrated flow, the set of flat dog-bone specimens and thin-walled cylindrical specimens were deformed in tension with a biaxial servo hydraulic testing system Instron 8850 and with additional vibration impact provided with a tensile load and a frequency of 4 Hz with a sinusoidal waveform. The results show the influence of additional cyclic loading on the spatial-time inhomogeneity of the plastic flow in metals, it is reduced the quasi-periodic character of the plastic flow. 25th International Conference on Fracture and Structural Integrity Investigation of the Portevin-Le Chatelier effect in metals under additional vibration impact by using the DIC-technique and the IR-analysis Tatyana Tretyakova a *, Valery Wildemann a , Mikhail Tretyakov a a Centre of Experimental Mechanics, Perm National Research Polytechnic University, 29 Komsomolsky AVE, Perm 614990, Russia Abstract In the present work, the deformation processes and local heating were analyzed by the digital image correlation technique and the infrared thermography accordingly to characterize the spatial-time inhomogeneity associated with the Chernov-Lüders behavior and the Portevin-Le Chatelier (PLC) effect in metals. To estimate the influence of the additional vibration impact on the serrated flow, the set of flat dog-bone specimens and thin-walled cylindrical specimens were deformed in tension with a biaxial servo hydraulic testing system Instron 8850 and with additional vibration impact provided with a tensile load and a frequency of 4 Hz with a sinusoidal waveform. The results show the influence of additional cyclic loading on the spatial-time inhomogeneity of the plastic flow in metals, it is reduced the quasi-periodic character of the plastic flow.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

Keywords: jerky flow; strain band; digital image correlation; thermography; acoustic emission; additional vibration impact. Keywords: jerky flow; strain band; digital image correlation; thermography; acoustic emission; additional vibration impact.

1. Introduction Up-to-date areas of study entail development of experimental mechanics methods and researches under complex thermomechanical effects using testing facilities, high-precision measurement instruments and systems of data registration aimed to adequately predict the behavior of materials and structures under given operating conditions, create new materials and structures. 1. Introduction Up-to-date areas of study entail development of experimental mechanics methods and researches under complex thermomechanical effects using testing facilities, high-precision measurement instruments and systems of data registration aimed to adequately predict the behavior of materials and structures under given operating conditions, create new materials and structures.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Corresponding author. Tel.: +79124995960; fax: +73422198732. E-mail address: cem.tretyakova@gmail.com * Corresponding author. Tel.: +79124995960; fax: +73422198732. E-mail address: cem.tretyakova@gmail.com

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.233