PSI - Issue 59

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 59 (2024) 642–649

© 2024 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 DMDP 2023 Organizers © 2024 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 DMDP 2023 Organizers Abstract The paper considers progress in developing fatigue indicators based on the phenomenon of extrusion/intrusion structure formation on the aluminum surface under fatigue. The new fatigue indicator looks like a miniature cruciform specimen with a single-crystal sensitive element at the center able to respond to biaxial loading by developing surface extrusion/intrusion relief. © 2024 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 DMDP 2023 Organizers 1. Introduction Fatigue damage assessment is extremely difficult for both uniaxial and multiaxial loading. The damage assessment and failure prediction are based on the experimental “Stress - Number of cycles” diagram, a lso known as Wohler curve, fatigue curve for constant-amplitude cyclic loading. For multiaxial loading, Fatigue Damage Parameter (FDP) is considered as uniaxial or shear stress resulting in the same damage as the actual multiaxial one. Various fatigue damage theories are used to find the FDP. The Huber-Mises yield criterion is often used as FDP for ductile constructional metals. The Huber-Mises equivalent stress, in its general form, is given by Von Mises (1913): VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Biaxial fatigue indicator M. Karuskevich a , T. Maslak a *, Yu. Vlasenko a , Ł . Pejkowski b a National Aviation University, Liubomyra Huzara Ave. 1, Kyiv 03058, Ukraine b Bydgoszcz University of Science and Technology, S. Kaliskiego 7, Bydgoszcz 85-796, Poland VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Biaxial fatigue indicator M. Karuskevich a , T. Maslak a *, Yu. Vlasenko a , Ł . Pejkowski b a National Aviation University, Liubomyra Huzara Ave. 1, Kyiv 03058, Ukraine b Bydgoszcz University of Science and Technology, S. Kaliskiego 7, Bydgoszcz 85-796, Poland Abstract The paper considers progress in developing fatigue indicators based on the phenomenon of extrusion/intrusion structure formation on the aluminum surface under fatigue. The new fatigue indicator looks like a miniature cruciform specimen with a single-crystal sensitive element at the center able to respond to biaxial loading by developing surface extrusion/intrusion relief. Keywords: biaxial loading; fatigue; indicator; extrusion/intrusion; single-crystal. Keywords: biaxial loading; fatigue; indicator; extrusion/intrusion; single-crystal. 1. Introduction Fatigue damage assessment is extremely difficult for both uniaxial and multiaxial loading. The damage assessment and failure prediction are based on the experimental “Stress - Number of cycles” diagram, a lso known as Wohler curve, fatigue curve for constant-amplitude cyclic loading. For multiaxial loading, Fatigue Damage Parameter (FDP) is considered as uniaxial or shear stress resulting in the same damage as the actual multiaxial one. Various fatigue damage theories are used to find the FDP. The Huber-Mises yield criterion is often used as FDP for ductile constructional metals. The Huber-Mises equivalent stress, in its general form, is given by Von Mises (1913):

* Corresponding author. Tel.: +38-066-336-7937. E-mail address: tetiana.maslak@npp.nau.edu.ua * Corresponding author. Tel.: +38-066-336-7937. E-mail address: tetiana.maslak@npp.nau.edu.ua

2452-3216 © 2024 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 DMDP 2023 Organizers 2452-3216 © 2024 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 DMDP 2023 Organizers

2452-3216 © 2024 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 DMDP 2023 Organizers 10.1016/j.prostr.2024.04.091