PSI - Issue 20

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

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Procedia Structural Integrity 20 (2019) 93–97

1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) The dependence of the crack growth trajectory on the parameters of the crack tip stress field Prokopyev Leonid Aleksandrovich a , Yakov Mikhailovich Andreev a , Evgeny Savvich Lukin b, * a Federal Research Centre “The Yakut Scientific Centre of the Siberian Branch of the Russian Academy of Sciences” , Yakutsk, Russia b The Institution of Russian Academy of Sciences the V.P. Larionov’s Institut of Physical -Technical Problems of the North, Siberian Branch of the RAS, Yakutsk, Russia Abstract The significant influence of non-singular terms of stress expansion (T-stress) on the stress-strain state at the crack tip is shown. Proposed to take into account the constant values of T-stress and other higher order members of stress expansion by representing as a single function of the angular distribution of T-stress. For a disk sample with a central crack, the crack growth direction was calculated for different parameters of mixed loading. The experimental results for predicting of crack growth direction, theoretical results on the well-known maximum tangential stress criterion, results using stress averaging in the pre-fracture zone, and the results of the proposed criterion are presented. It is shown that the results of theoretical calculations according to the proposed criterion are closest to the experimental results compared with the well-known tangential stress criterion. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) The dependence of the crack growth trajectory on the parameters of the crack tip stress field Prokopyev Leonid Aleksandrovich a , Yakov Mikhailovich Andreev a , Evgeny Savvich Lukin b, * a Federal Research Centre “The Yakut Scientific Centre of the Siberian Bra ch of the Ru si n Academy of Sciences” , Yakutsk, Russia b The Institution of Russian Academy of Sciences the V.P. Larionov’s Institut of Physical -Technical Problems of the North, Siberian Branch of the RAS, Yakutsk, Russia Abstract The significant influen e of non-singul r terms of stress xp sion (T-stress) n the stress-strain state at the crack tip is shown. Proposed to take i t accou t the constant values of T-stress and other higher order members of stress expansion by representing as a single function of the ngular distribution of T-stress. For a disk sample with a central cra k, the crack growth direction was calculated for different parameters of mixed loadi g. The experime tal results for predicting of crack growth direction, theoretical results on the well-known maximum tangential stress criterion, r sults using stress averaging in the pre-fracture zone, and the results f th proposed crit rion ar presented. It is shown t at the results of theoretical calculations according to the proposed criterion are closest to the experimental results compared with the well-known tangential stress criterion.

© 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: Crack path, T-stress, stress distribution Keywords: Crack path, T-stress, stress distribution

1. Introduction One of the most important areas of fracture mechanics is survivability of constructions with existing factory or operational defects. Often, the problems of the survivability of structures are reduced to the problems of predicting 1. Introduction One of the most important areas of fracture mechanics is survivability of constructions with existing factory or operational defects. Often, the problems of the survivability of structures are reduced to the problems of predicting

* Corresponding author. Tel.: +79681548286. E-mail address: l.prokopyev@yandex.ru * Corresponding author. T l.: +79681548286. E-mail address: l.prokopyev@yandex.ru

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

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.121