PSI - Issue 68

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 68 (2025) 809–814

European Conference on Fracture 2024 Fatigue crack growth and fracture toughness of shot peened 6060 T6 aluminium alloy Erik Calvo-García a,b,* , Óscar Barro b , Pablo Pou-Álvarez b , Aida Badaoui a , Daniel Wallerstein b , Antonio Riveiro a,b , Rafael Comesaña a,b a Materials Engineering, Applied Mechanics and Construction Department, EEI, University of Vigo, Lagoas-Marcosende, 36310 Vigo, Spain b LaserOn, CINTECX, University of Vigo, Lagoas-Marcosende, 36310 Vigo, Spain Abstract Aluminium alloys are widely used in many industrial sectors due to their high strength-to-weight ratio. The structural integrity of aluminium components is a fundamental issue when these components are subjected to fatigue loading. Some surface treatments such as shot peening, or laser shock peening can induce compressive residual stresses in the treated material and thus may be effective at delaying crack propagation. In this research, the fracture toughness of a 6060 T6 aluminium alloy was evaluated according to ASTM E1820 standard. SE(B) specimens were analysed in the non-treated condition and after different shot peening treatments. The crack propagation behaviour of these specimens was evaluated during the fatigue precrack stage of the tests by fitting the crack growth rates to Paris law. Then, a fracture toughness value was determined using the resistance curve procedure method. The results of these tests demonstrated that the shot peening treatments had little or no significant effect on the fracture toughness values, or the crack propagation rates. The reason behind these results is probably the shallow depth of the strain hardened layer affected by the shot peening treatments. © 2025 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 ECF24 organizers Keywords: aluminium alloy; shot peening; crack propagation; fracture toughness © 2025 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 ECF24 organizers

* Corresponding author. E-mail address: erik.calvo@uvigo.gal

2452-3216 © 2025 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 ECF24 organizers

2452-3216 © 2025 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 ECF24 organizers 10.1016/j.prostr.2025.06.134