PSI - Issue 41

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 41 (2022) 192–198

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.021 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 MedFract2Guest Editors. 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 MedFract2Guest Editors. * Corresponding author. Tel.: +7-916-100-91-55 E-mail address: ygmatvienko@gmail.com © 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 MedFract2Guest Editors. Abstract The novel non-destructive method for quantitative description of low-cycle fatigue damage accumulation is proposed and implemented. The key point, that defines scientific novelty and powerfulness of this approach, consists of involving various deformation parameters referred to critical point belonging to the hole boundary as current damage indicator. Required strain values follow from distributions of all three displacement components along the hole edge measured by reflection hologram interferometry. The derived data at different stage of low cycle fatigue lead to normalized dependencies of various strain parameters from number of loading cycle, which are a source of damage accumulation functions. Abstract The novel non-destructive method for quantitative description of low-cycle fatigue damage accumulation is proposed and implemented. The key point, that defines scientific novelty and powerfulness of this approach, consists of involving various deformation parameters referred to critical point belonging to the hole boundary as current damage i dicator. R quired strain values follow from distributi ns of all three displacement component al ng the hole edge easured by r flection hologram interferometry. The derived data at different stage of low ycle fatigue lead to normalize dependencies of various strain parameters from number of l ading cycle, which are a source of damage accumulation functions. Keywords: Damage acummulation; local strain evolution; reflection hologram interferometry. 1. Introduction Earlier, the destructive method employing preliminary low-cycle fatigue loading of specimens with holes and inserting sequence of narrow notches under constant external load has been proposed by Matvienko et al. (2020, 2021, 2022). To quantify damage accumulation, singular and non-singular fracture mechanics parameters of created 2nd Mediterranean Conference on Fracture and Structural Integrity Quantification of low-cycle fatigue damage accumulation in stress concentration area by local strain evolution Yu.G Matvienko a* , V.S. Pisarev b , S.I. Eleonsky b a Mechanical Engineering Research Institute of the Russian Academy of Science, 4 Maly Kharitonievsky Pereulok, 101990 Moscow, Russia. b Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI), 1 Zhukovsky Street, Zhukovsky, 140180 Moscow Region, Russia 2nd Mediterranean Conference on Fracture and Structural Integrity Quantification of low-cycle fatigue damage accumulation in stress concentration area by local strain evolution Yu.G Matvienko a* , V.S. Pisarev b , S.I. Eleonsky b a Mechanical Engineering Research Institute of the Russian Academy of Science, 4 Maly Kharitonievsky Pereulok, 101990 Moscow, Russia. b Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI), 1 Zhukovsky Street, Zhukovsky, 140180 Moscow Region, Russia Keywords: Damage acummulation; local strain evolution; reflection hologram interferometry. 1. Introduction Earlier, the destructive method employing preliminary low-cycle fatigue loading of specimens with holes and inserting sequence of narrow notches under constant external load has been proposed by Matvienko et al. (2020, 2021, 2022). To quantify damage accumulation, singular and non-singular fracture mechanics parameters of created * Corresponding author. Tel.: +7-916-100-91-55 E-mail address: ygmatvienko@gmail.com