PSI - Issue 20

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2018) 000–000 Structural Integrity Procedia 00 (2018) 000–000

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Procedia Structural Integrity 20 (2019) 87–92

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Model of the brittle crack growth under the combined mode loading. Victor Petrov a, *, Valeriy Lepov a,b a Larionov’s Institute of Pysical-Technical Problems of the North SB RAS, 1 Oktyabrskaja str., 677891, Yakutsk, Russia b Academy of Science of Republic of Sakha (Yakutia), 33 Lenina av., 677007, Yakutsk, Russia Model of the brittle crack growth under the combined mode loading. Victor Petrov a, *, Valeriy Lepov a,b a Larionov’s Institut of Pysi al-T chnical Problems of the North SB RAS, 1 Oktyabrskaja str., 677891, Y kutsk, Russia b Academy of Science of Republic of Sakha (Yakutia), 33 Lenina av., 677007, Yakutsk, Russia The modified model for dynamic crack growth in viscoelastic material has been proposed. The model based on the structural approach that includes Zhurkov’s thermokinetical concept and Neiber-Novozhilov’s criterion of brittle fracture. The structural approach describes the microstructure inhomogeneity of material and staging of crack propagation revealing by optical and electronic fractography as changing the scale of damage accumulation and fracture. The main parameters of the physical model approved by experimental data on the pulse hit action of striker to a notch of the permanently hardly loaded single edge-notched specimen in wide range of environment temperatures has been analyzed in the paper. The proposed model of brittle crack growth under the dynamic blow influence based on physical representations of the fluctuation nature of the fracture process and enables a description of the transition from discrete experimental data under combined loading to a set of continuous numerical data sufficient to calculate the values of the crack tip energy flow in a wide range of external loading and extreme environment, including the low temperatures. The modified model for dynamic crack growth in vis oelastic material has been proposed. The mod l based on t tr t r l r that includes Zhurkov’s thermokinetical concept and Neiber-Novozhil v’s criterion of brittle fracture. The structural approach des ribes t e microstructure inhom geneity of material a d staging of crack propagation revealing by optical and electronic fractography s changing the scale of damage accumulation and fractur . The main parameters of the physical model a prov d by experimental data on th pulse hit action of striker to a notch of the permanently har ly loaded single edge-notched specimen in wide range of environment temperatures has bee analyzed in the paper. The prop sed model of brittle crack growth un er the dynamic blow influence based on physical represent tio s of the fluctuation ature of the fracture process and enables a description of the transition from discrete experim ntal data under combi ed loading to a set of continuous numerical data sufficient to calculate the values of the crack tip energy flow in a wide range of external loading and extreme environment, including the low temperatures. Abstract Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers

Keywords: brittle fracture; viscoelasticity; shock loading; tension; crazin п ; polymethylmethacrylate; crack growth model; crack resistance; high speed photo registration. Keywords: b ittle fracture; viscoelasticity; shock loading; tension; crazin п ; polymethylmethacrylate; crack growth model; crack resistance; high speed photo registration.

Introduction Introduction

Worldwide, there is now increasing interest in the modeling of complex dynamic fracture processes in a wide range of loading rates and in different environmental conditions, since progress in development of high-speed Worldwide, there is now increasing interest in the modeling of complex dynamic fracture processes in a wide range of loading rates and in different environmental conditions, since progress in development of high-speed

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452 3216 © 2019 Th Author(s). Publis d by lsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Correspon ing author. Tel.: +7-411-2390-583; fax: +7-411-2390-599. E-mail address: v_n_petrov@iptpn.ysn.ru * Corresponding author. Tel.: +7-411-2390-583; fax: +7-411-2390-599. E-mail address: v_n_petrov@iptpn.ysn.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.120