PSI - Issue 76

R. Fernandes et al. / Procedia Structural Integrity 76 (2026) 43–49

48

Fig. 5. Fatigue crack growth rate curves under overload magnitude of 2.0 at Δ KOL = 4, 7 e 9 MPa √ m.

4. Conclusions This work investigated the fatigue crack growth rates of AlSi10Mg aluminium alloy specimens, produced by L PBF under different conditions, including single tensile overload ratios of 2.0. The main findings can be drawn: - In Paris regime the FCG behavior of as-built and as-built shot-peened specimens was similar. Also, for stress relieved specimens, shot-peening treatment provided no notable benefit; - Overload promotes pronounced crack growth retardation. As-built specimens fractured during the third overload. This highlights the higher ductility and toughness of the stress-relieved condition compared to the as-built condition. Acknowledgements This research work was funded by national funds through FCT – Fundação para a Ciência e a Tecnologia – , under the project UIDB/00285/2020 and LA/P/0112/2020. This research was funded by the FACI-2023-MPR-04-014323 project, supported by European Funds and facilitated by Agência Nacional Inovação (ANI) under the Eureka smart label S0612-BRACER. This research was also funded by project MATEL, with the reference COMPETE2030 FEDER-00587200, supported by European Funds under Portugal 2030, Compete2030 and FEDER. Rui Fernandes is also grateful to the FCT for the PhD grant with reference 2022.14234.BD. References Beretta, S., Romano, S., A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes. Int J Fatigue 94, 178–191 (2017). https://doi.org/10.1016/J.IJFATIGUE.2016.06.020. Fernandes, R.F., Jesus, J.S., Borrego, L.P., Ferreira, J.A.M., Branco, R., Costa, J.D., Batista, A.C., Marques, M.J., Failure analysis of fatigue crack propagation in specimens of AlSi10Mg aluminum alloy produced by L-PBF: Effect of different heat treatments. Eng Fail Anal 163 108595 (2024). https://doi.org/10.1016/J.ENGFAILANAL.2024.108595. Frazier, W.E.: Metal additive manufacturing: a review, Journal of Materials Engineering and Performance 23, 1917–1928 (2014). Hastie, J.C., Koelblin, J., Kartal, M.E., Attallah, M.M., Martinez, R., Evolution of internal pores within AlSi10Mg manufactured by laser powder bed fusion under tension: As-built and heat treated conditions. Mater Des 204 109645 (2021). https://doi.org/10.1016/j.matdes.2021.109645.