PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2020) 000–000 Structural Integrity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 28 (2020) 1650–1654

1st Virtual European Conference on Fracture Peridynamic modelling of the dynamic crack initiation Maksim Ignatev a *, Nikita Kazarinov a,c , Yuri Petrov a,b a Saint-Petersburg State University, Saint-Petersburg, 199034, Russia b RAS Inst Probl Mech Engng, Saint-Petersburg, 199178, Russia c Emperor Alexander I St. Petersburg State Transport University, Saint-Petersburg, 190031, Russia 1st Virtual European Conference on Fracture Peridynamic modelling of the dynamic crack initiation Maksim Ignatev a *, Nikita Kazarinov a,c , Yuri Petrov a,b a Saint-Petersburg State University, Saint-Petersburg, 199034, Russia b RAS Inst Probl Mech Engng, Saint-Petersburg, 199178, Russia c Emperor Alexander I St. Petersburg State Transport University, Saint-Petersburg, 190031, Russia

© 2020 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 European Structural Integrity Society (ESIS) ExCo Abstract In the present work the problem of dynamic crack initiation in the brittle solid body was studied using the non-classical approaches of continuum mechanics: peridynamics and incubation time fracture model. For this purpose, structural and incubation time criteria were formulated as criteria of the bond failure. These approaches consider the stress fields in the vicinity of the crack tip, therefore the stress-based failure criteria of the bonds were suggested. Despite the fact that both approaches consider the fracture process as a sequential failure of the structural blocks of a small certain size, which is a material constant, an element size independent approach was proposed. Damage models were implemented in the open-source peridynamic numerical package Peridigm for the state based ordinary material model. As a result, numerically obtained stress intensity factor (SIF) - fracture initiation time dependence fits well the experimental data found in works by Ravi-Chandar K., Knauss W.G., (1984a). © 2020 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 European Structural Integrity Society (ESIS) ExCo Keywords: dynamic fracture, brittle fracture, peridynamics, fracture criterion, incubation time; 1. Introduction. In the end of the last century Ravi-Сhandar and Knauss (Ravi-Chandar K., Knauss W.G., (1984a,b)) conducted a series of experiments on the dynamic crack initiation, propagation and crack arrest in the brittle samples made of a glassy polymer material (Homalite-100). Measured values of the SIF (stress intensity factor) at the moment of crack Abstract In the present work the problem of dynamic crack initiation in the brittle solid body was studied using the non-classical approaches of continuum mechanics: peridynamics and incubation me fracture model. For this purpose, str ctural and i cubat on time criteria were form lated as cr teria of the bond f ilure. These approaches consider the stre s fields in the vicinity of the crack tip, the efore th stress-based f ilu e criteria of the bonds were suggested. D pite the fact that both approaches onsider f ture process as a sequ ntial failure of the structural locks of a small certain siz , which is material constant, an element size independent pproach was proposed. Damage models were implement d i the open-source peridyn mic umerical package Peridigm for the state based ordinary material model. As a sult, numerically obtained st ess intensity factor (SIF) - fracture init ation tim dep ndence fits well the experi ental data found in works by Ravi-Chan ar K., K aus W.G., (1984a). © 2020 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 European Structural Integri y Society (ESIS) ExC K ywords: dynamic fracture, brittle fractur , peridyn mics, fracture criterion, incubation time; 1. Introduction. In the end of the last century Ravi-Сhandar and Knauss (Ravi-Chandar K., Knauss W.G., (1984a,b)) conducted a series of xperiments on the d namic cr ck initiation, propag tion and c ack arrest in the brittle samples made of glassy polym r aterial (Homalite-100). Measured values of the SIF (stress inten ity factor) a the oment of crack

* Corresponding author. Tel.: +7-964-366-64-64. E-mail address: ignatiev_maksim@mail.ru * Corresponding author. Tel.: +7-964-366-64-64. E-mail address: ignatiev_maksim@mail.ru

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 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 u der responsibility of t European Structural Integrity So i ty (ESIS) ExCo

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.138