PSI - Issue 77

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ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Structural Integrity Procedia 00 (2026) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 77 (2026) 649–656

© 2026 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 ICSI organizers Abstract The fatigue and crack growth behavior of a bolt hole detail were examined using both experimental testing and numerical analyses. To characterize fatigue performance, three different models were applied to the experimental data: Basquin, Kohout-Vechet and Castillo models. Mean and characteristic S–N curves were established for the obtained experimental data, with Castillo’s model proving to deliver the most accurate fatigue life predictions across all stress ranges. Comparisons further revealed that the most recent version of the EC3-1-9 design curve leads to very conservative estimations for all fatigue regimes. For fatigue crack growth (FCG) assessment, tests were performed on specimens with single and double cracks initiating from the bolt hole. Results show that the FCG curve defined in BS7910 is suitable to predict the behaviour of the crack in this detail since all data were found with lower crack growth rate. The presence of multiple cracks caused a remarkable reduction in fatigue life. Assuming that the bolt hole used in this study is part of a bolted connection with standard bolt and washer sizes, the fatigue crack would become visible at a final stage of the entire fatigue life of the detail. Overall, the study underlines the importance of understanding fatigue mechanisms and crack propagation in evaluating the fatigue strength of bolt hole details. The results lead to enhance fatigue life prediction accuracy and provide new insights into crack growth behavior in such structural details. © 2026 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 ICSI organizers Keywords: Fatigue; Bolt Hole; Crack Growth International Conference on Structural Integrity Fatigue crack mechanisms of bolt hole detail Bruno Pedrosa a,* , Behzad Vasheghani Farahani b,c , Carlos Rebelo a , Rúben F. Santos a,b , José Correia a* a Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal b INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, FEUP, R. Dr. Roberto Frias 400, 4200-465 Porto, Portugal c Ghent University, Department of Electromechanical, Systems and Metal Engineering, Soete Laboratory, TechnologiePark 46, 9052, Zwijnaarde, Belgium Abstract The fatigue and crack growth behavior of a bolt hole detail were examined using both experimental testing and numerical analyses. To characterize fatigue performance, three different models were applied to the experimental data: Basquin, Kohout-Vechet and Castillo models. Mean and characteristic S–N curves were established for the obtained experimental data, with Castillo’s model proving to deliver the most accurate fatigue life predictions across all stress ranges. Comparisons further revealed that the most recent version of the EC3-1-9 design curve leads to very conservative estimations for all fatigue regimes. For fatigue crack growth (FCG) assessment, tests were performed on specimens with single and double cracks initiating from the bolt hole. Results show that the FCG curve defined in BS7910 is suitable to predict the behaviour of the crack in this detail since all data were found with lower crack growth rate. The presence of multiple cracks caused a remarkable reduction in fatigue life. Assuming that the bolt hole used in this study is part of a bolted connection with standard bolt and washer sizes, the fatigue crack would become visible at a final stage of the entire fatigue life of the detail. Overall, the study underlines the importance of understanding fatigue mechanisms and crack propagation in evaluating the fatigue strength of bolt hole details. The results lead to enhance fatigue life prediction accuracy and provide new insights into crack growth behavior in such structural details. © 2026 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 ICSI organizers Keywords: Fatigue; Bolt Hole; Crack Growth International Conference on Structural Integrity Fatigue crack mechanisms of bolt hole detail Bruno Pedrosa a,* , Behzad Vasheghani Farahani b,c , Carlos Rebelo a , Rúben F. Santos a,b , José Correia a* a Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal b INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, FEUP, R. Dr. Roberto Frias 400, 4200-465 Porto, Portugal c Ghent University, Department of Electromechanical, Systems and Metal Engineering, Soete Laboratory, TechnologiePark 46, 9052, Zwijnaarde, Belgium

* Corresponding author. Tel.: (+351) 225 081 400 E-mail address: bapedrosa@fe.up.pt * Corresponding author. Tel.: (+351) 225 081 400 E-mail address: bapedrosa@fe.up.pt

2452-3216 © 2026 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 ICSI organizers 2452-3216 © 2026 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 ICSI organizers

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