PSI - Issue 32

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Procedia Structural Integrity 32 (2021) 326–333 XXIIth Winter School on Continuous Media Mechanics Effect of crack curvature radius on the stress fields under nonlinear deformation N.V. Boychenko a * a Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences, Lobachevsky str, 2/31,Kazan, Russia Abstract The influence of crack curvature radius and plastic properties of material on the crack tip fields is evaluated by conventional mechanism-based strain gradient (CMSG) plasticity theory, and classical plasticity theory. Stress fields in single edge tension specimen are investigated numerically for a wide range of the crack curvature radius variations. The strain hardening exponent varied from N =0.075 to N =0.4. The local areas of the influence of the crack tip curvature radius are established for the strain gradient plasticity and classical plasticity. The couple effects of material length scale parameter and plastic properties of material on crack tip fields are established for strain gradient plasticity. The boundaries of CMSG plasticity dominated zone are determined. XXIIth Winter School on Contin ous Media Mechanics Effect of crack curvature radius on the stress fields under nonlinear deformation N.V. Boychenko a * a Institute of Power Engineering and Advanced Technologies, FRC Kazan Scientific Center, Russian Academy of Sciences, Lobachevsky str, 2/31,Kazan, Russia Abstract The in luence of crack curvature radius and plastic properties of mat rial on the c ack tip field is evaluated by conv ntional mechanism-based strain gradient (CMSG) plasticity theory, and classical plasti ity theory. Stress fields in single edge tens on spe imen are inve tigated numerically for a wide range of the crack curvat re radius variations. The strain hardening exponent varied from N =0.075 to N =0.4. The local areas of the influence of the crack tip curvature radius are established for the strain gradient plasticity and classical plasticity. The couple effects of material length scale parameter and plastic properties of material on crack tip fields are established for strain gradient plasticity. The boundaries of CMSG plasticity dominated zone are determined. © 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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” © 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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” © 2021 The Authors. Pu lished 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 XXIIth Winter School on Continuous Media Mechanics” Keywords: Crack tip curvature radius; Stress fields; HRR-model; Strain gradient plasticity

Keywords: Crack tip curvature radius; Stress fields; HRR-model; Strain gradient plasticity

* Corresponding author. Tel.: +78432363102; fax: +78432363102. E-mail address: nataboi@ya.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 the scientific committee of the XXIIth Winter Sch ool on Continuous Media Mechanics” 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 the scientific committee of the XXIIth Winter Sch ool on Continuous Media Mechanics” * Corresponding author. Tel.: +78432363102; fax: +78432363102. E-mail address: nataboi@ya.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 the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.047