PSI - Issue 42

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Procedia Structural Integrity 42 (2022) 1046–1053 Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 0 ( 0 9) 000–000

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© 2022 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 23 European Conference on Fracture – ECF23 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) P r-revie unde responsibility of 23 European Conference on F acture – ECF23 . Keywords: crack interaction; shielding e ff ect; inactive zone; relaxation zone; stress corrosion cracking; edge e ff ect Abstract The e ff ect of interaction of rectilinear cracks of di ff erent lengths, grouped into stacks, under uniaxial tension normal to the cracks, on their stress-corrosion growth is studied. We examine whether the circular relaxation zone around a pre-existing crack may suppress the growth of other cracks inside the zone. It is found that the farther away neighbors may a ff ect the growth of the considered crack not only quantitatively but, also, in a qualitative way. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . Keywords: crack interaction; shielding e ff ect; inactive zone; relaxation zone; stress corrosion cracking; edge e ff ect 23 European Conference on Fracture – ECF23 Environmentally assisted growth of multiple cracks grouped in stacked configurations Abdulla Abakarov a , Yulia Pronina a, ∗ a Saint Petersburg State University, Universitetskaya emb. 7 / 9, St. Petersburg 199034, Russia Abstract The e ff ect of interaction of rectilinear cracks of di ff erent lengths, grouped into stacks, under uniaxial tension normal to the cracks, on their stress-corrosion growth is studied. We examine whether the circular relaxation zone around a pre-existing crack may suppress the growth of other cracks inside the zone. It is found that the farther away neighbors may a ff ect the growth of the considered crack not only quantitatively but, also, in a qualitative way. 23 European Conference on Fracture – ECF23 Environmentally assisted growth of multiple cracks grouped in stacked configurations Abdulla Abakarov a , Yulia Pronina a, ∗ a Saint Petersburg State University, Universitetskaya emb. 7 / 9, St. Petersburg 199034, Russia Stress corrosion cracking (SCC) is a degradation process of engineering materials that occurs by slow, environmen tally induced crack propagation. The crack propagation is the result of the synergistic interaction of mechanical load ing and aggressive environment (see, e.g., Jones and Ricker (1992)). SCC involves nucleation of steady-propagating cracks, succeeding crack propagation and coalescence, and large crack formation resulting in final failure (Tohgo et al. (2009); Butusova et al. (2020)). After reaching the critical condition for steady crack propagation when the mode I stress intensity factor (SIF), K I , reaches the value K SCC I , the crack propagation rate, dl / dt , increases with increasing K I . Under conditions of SCC or fatigue, large number of cracks are usually initiated (Kamaya and Haruna (2007); Bolivar et al. (2017); Bellini et al. (2020); Kachanov et al. (2021)). The interaction between multiple cracks consider ably alters the stress concentration in the vicinity of the crack tips (Kachanov (1993)): depending on the configuration of the crack array, it can either increase or decrease the SIFs, thus a ff ecting the rate of the growth of individual cracks. The related issues are widely studied by experimental and computational methods; the corresponding reviews may be found in the works of Kamaya and Haruna (2007) and Fujii et al. (2015). Interaction and coalescence of two o ff set cracks was studied, e.g., by Wang et al. (1996) and Kamay and Totsuka (2002), where the crack path was Stress corrosion cracking (SCC) is a degradation process of engineering materials that occurs by slow, environmen tally induced crack propagation. The crack propagation is the result of the synergistic interaction of mechanical load ing and aggressive environment (see, e.g., Jones and Ricker (1992)). SCC involves nucleation of steady-propagating cracks, succeeding crack propagation and coalescence, and large crack formation resulting in final failure (Tohgo et al. (2009); Butusova et al. (2020)). After reaching the critical condition for steady crack propagation when the mode I stress intensity factor (SIF), K I , reaches the value K SCC I , the crack propagation rate, dl / dt , increases with increasing K I . Under conditions of SCC or fatigue, large number of cracks are usually initiated (Kamaya and Haruna (2007); Bolivar et al. (2017); Bellini et al. (2020); Kachanov et al. (2021)). The interaction between multiple cracks consider ably alters the stress concentration in the vicinity of the crack tips (Kachanov (1993)): depending on the configuration of the crack array, it can either increase or decrease the SIFs, thus a ff ecting the rate of the growth of individual cracks. The related issues are widely studied by experimental and computational methods; the corresponding reviews may be found in the works of Kamaya and Haruna (2007) and Fujii et al. (2015). Interaction and coalescence of two o ff set cracks was studied, e.g., by Wang et al. (1996) and Kamay and Totsuka (2002), where the crack path was 1. Introduction 1. Introduction

∗ Corresponding author. Tel.: + 7-812-428-7159 ; fax: + 7-812-428-7159. E-mail address: y.pronina@spbu.ru ∗ Corresponding author. Tel.: + 7-812-428-7159 ; fax: + 7-812-428-7159. E-mail address: y.pronina@spbu.ru

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.132 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 .