PSI - Issue 36

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000

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Procedia Structural Integrity 36 (2022) 197–202

© 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 conference Guest Editors © 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 conference Guest Editors Keywords: aluminum alloy, cold expansion holes, residual lifetime, crack, loading cycle; 1. Introduction The increase of the joints endurance of the aircraft structures with holes is extremely important in order to ensure their operation safety. Operational loads result in fatigue, material structure damage and defect accumulation. Analysis of literature sources shows many cases of operational damage of power elements in different types of Abstract The influen e f cold expanded hol on the residual lif ime of aluminum plate with pre-crack near t hole is inv stigated taking into account cold expansion degree a d hole diameter. The cold e pansion significantly incr ases the re idual lifetime of aluminum alloy plates i c mparison with unstrengthened plates. The maximal effect of residual lifetime increased by 6,6 times is observed at cold expansion degree i = 2.7%. © 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 conference Guest Editors Keywords: aluminum alloy, cold expansion holes, residual lifetime, crack, loading cycle; 1. Introduction The increase of the joints endurance of the aircraft structures with holes is extre ely important in order to ensure their operation safety. Operational loads result in fatigue, material structure damage a d defect accumulation. Analysis of literature sources shows many cases of operational damage of power elements in different types of 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Residual lifetime of the plates with preexisting crack near cold expanded hole Petro Yasniy a , Ihor Okipnyi a *, Oleksandr Dyvdyk b , Anna Rudawska c , Viktor Senchyshyn a a Dept. of Engineering of Machine Building Technologies,Ternopil Ivan Puluj National Technical University, Ruska 56, Ternopil 46001, Ukraine b Dept. of Structural Mechanics, Ternopil Ivan Puluj National Technical University, Ruska 56, Ternopil 46001, Ukraine c Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, Lublin, 20-618, Poland Abstract The influence of cold expanded hole on the residual lifetime of aluminum plates with pre-crack near the hole is investigated taking into account cold expansion degree and hole diameter. The cold expansion significantly increases the residual lifetime of aluminum alloy plates in comparison with unstrengthened plates. The maximal effect of residual lifetime increased by 6,6 times is observed at cold expansion degree i = 2.7%. 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Residual lifetime of the plates with preexisting crack near cold expanded hole Petro Yasniy a , Ihor Okipnyi a *, Oleksandr Dyvdyk b , Anna Rudawska c , Viktor Senchyshyn a a Dept. of Engineering of Machine Building Tech logies,Ternopil Iva Puluj National Technical University, Ruska 5 , Ternopil 46001, Ukraine b Dept. of Structural Mecha ics, Ter opil Iva Puluj Na ional Technical Univer i y, Ruska 56, Ter opil 46001, Ukraine c Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36, Lublin, 20-618, Poland

* Corresponding author. Tel.: +38-0352-52-41-81; fax: +38-0352-25-49-83. E-mail address: i.okipnyi@gmail.com * Corresponding author. Tel.: +38-0352-52-41-81; fax: +38-0352-25-49-83. E-mail address: i.okipnyi@gmail.com

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 conference Guest Editors 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an ope acc s article under t CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the conference Guest 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 conference Guest Editors 10.1016/j.prostr.2022.01.024