PSI - Issue 39

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 39 (2022) 432–440

© 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 CP 2021 – Guest Editors The study investigates forming of the cracks under the action of the cylindrical shock wave initiated with the electric explosion of wire. Generation of such wave performed with short intensive high-voltage discharge through the thin wire placed along we axis of the sample and subsequent expansion of its vaporization products. Propagation of such cracks through cylindrical samples of PMMA and fluoropolymer with various rates of loading was discovered. The comparative specifications of the development of the cracks in PMMA and fluoropolymer were obtained. Threshold fracture parameters of tested materials were estimated for various rates of stress. Analysis of correlation between parameters of the wire explosion and cracks forming and development performed. © 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 CP 2021 – Guest Editors Keywords: electric explosion of wires; pulse loading; high-rated stress PMMA; fluoroplastic 1. Introduction Brittle failure of the continuous matter with propagating cracks took place in a wide range of technological processes, e.g. fracture of the rocks by an explosion in the mining industry, hydrofracturing, mechanical destruction, etc. It brings a significant impact to the durability of constructions and buildings. Abstract Electrical-physical techniques of intensive mechanical action based in particular on the phenomenon of electric explosion of wires attract more and more attention as methods of high-r ted deformation and fracture of poly r spacemen such as P ly(methyl methacrylate) (PMMA), fluoropoly er, etc. Detailed inv stigation of forming of cracks and dependence between it and prop gation of the shock waves through th sample appears to be ma datory for the understandi g of th pro sses of high-rate loading of such polymers. The study investigates forming of the cracks under the action of the cylindrical shock wave initiated with the electric explosion of wire. Generation of such wave performed with short intensive high-voltage disc arge through th thin wire placed along we axis of the sample a d subsequent expansion of s vaporization products. Propagation of such cracks rough cy indric l samples of PMMA and fluoropolymer with various rates of loading was discovered. The comparative specifica ions of the development of the cracks in PMMA and fluoropolymer we e obtained. Threshold fracture parameters of tested materials were estimated for various rates of stress. n lysis of correlation b tween parameters of the wire x losion and cracks forming and dev lop ent pe formed. © 2021 Th 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 CP 2021 – Guest Editors Keywords: electric explosion of wires; pulse loading; high-rated stress PMMA; fluoroplastic 1. Introduction Brittle failure of the continuous matter with propagating cracks took place in a wide range of technological processes, e.g. fracture of the rocks by n explosion in the mining industry, hydrofracturing, mechanical destruct on, etc. It brings a significant impact to the durabi ity f constructio s a buildings. 7th International Conference on Crack Paths Forming and propagation of the cracks initiated with electric explosion of wires in polymer materials Viktor Morozov, Victor Kats* St Petersburg University, 13B Universitetskaya Emb.,St Petersburg 199034, Russia Abstract Electrical-physical techniques of intensive mechanical action based in particular on the phenomenon of electric explosion of wires attract more and more attention as methods of high-rated deformation and fracture of polymer spacemen such as Poly(methyl methacrylate) (PMMA), fluoropolymer, etc. Detailed investigation of forming of cracks and dependence between it and propagation of the shock waves through the sample appears to be mandatory for the understanding of the processes of high-rated loading of such polymers. 7th International Conference on Crack Paths Forming and propagation of the cracks initiated with electric explosion of wires in polymer materials Viktor Morozov, Victor Kats* St Petersburg University, 13B Universitetskaya Emb.,St Petersburg 199034, Russia

* Corresponding author. E-mail address: v.kats@spbu.ru * Corresponding author. E-mail address: v.kats@spbu.ru

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 CP 2021 – Guest Editors 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 CP 2021 – Guest Editors

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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.112