PSI - Issue 77

R. Branco et al. / Procedia Structural Integrity 77 (2026) 376–381 Branco et al. / Structural Integrity Procedia 00 (2026) 000–000

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principal stress, while the latter was governed by the first principal direction at the initiation site. Mean errors were approximately 5º and 4º, respectively. • The effect of heat treatment was not completely conclusive. In some cases, a clear beneficial effect was observed; in others, the improvement was more moderate; and in some instances, a detrimental effect was found. Therefore, further research is required to gain a deeper understanding of the influence of this stress relief heat treatment on the multiaxial fatigue behaviour of L-PBF-processed AlSi10Mg aluminium alloy. Acknowledgements The authors gratefully acknowledge financial support from the Portuguese Foundation of Science and Technology (FCT) under the projects 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, Compete 2030 and FEDER. Rui Fernandes is grateful to the FCT for the PhD grant with reference 2022.14234.BD. The authors also would like to acknowledge the MSc student Beatriz Cunha. References Branco, R., Prates, P.A., Costa, J.D., Martins Ferreira, J.A., Capela, C., Berto, F., 2021. Notch fatigue analysis and crack initiation life estimation of maraging steel fabricated by laser beam powder bed fusion under multiaxial loading, International Journal of Fatigue153, 106468. Fernandes, R.F., Jesus, J.S., Borrego, L.P., Ferreira, J.A.M., Branco, R., Costa, J.D., Batista, A.C., Marques, M.J., 2024. Failure analysis of fatigue crack propagation in specimens of AlSi10Mg aluminum alloy produced by L-PBF: Effect of different heat treatments, Engineering Failure Analysis,163, 108595. Fernandes, R.F., Jesus, J.S., Branco, R., Borrego, L.P., Costa, J.D., Ferreira, J.A.M., 2025. Effect of low-temperature stress relieving heat treatments on fatigue behaviour and failure mechanisms of L-PBF AlSi10Mg aluminium alloy, Engineering Failure Analysis169,109210. Fiocchi, J., Tuissi, A., Biffi, C.A., 2021. Heat treatment of aluminium alloys produced by laser powder bed fusion: A review. Materials & Design 204, 109651. Huang, N., Luo, Q., Bartles, D.L., Simpson, T.W., Beese, A.M., 2024. Effect of heat treatment on microstructure and mechanical properties of AlSi10Mg fabricated using laser powder bed fusion, Materials Science and Engineering A 895, 46228 Papuga, J., Reis, L., Matušů, M., Costa, P.R, Šimota, J., Rosenthal, J., Bumba, F., 2024. Multiaxial fatigue analysis of additively manufactured hollow specimens from AlSi10Mg, Procedia Structural Integrity 57, 79-86.