PSI - Issue 82

L. Mata et al. / Procedia Structural Integrity 82 (2026) 16–23

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Mata et al. / Structural Integrity Procedia 00 (2026) 000–000

• For the same σ⁄τ ratio and nominal stress amplitude, fatigue life was shorter under tension-torsion loading than under bending-torsion loading, regardless of the material condition; • The application of heat treatment led to a decrease in fatigue life for both loading scenarios, indicating a detrimental effect of this stress relief treatment on multiaxial fatigue performance of the tested alloy; • The proposed numerical approach was capable of successfully predicting the crack initiation locations, early stage crack growth direction and fatigue life under combined bending-torsion and tension-torsion. Acknowledgements The authors acknowledge Fundação para a Ciência e a Tecnologia (FCT, I.P.) for its financial support through the UIDB/00667 project: Unidade de Investigação e Desenvolvimento em Engenharia Mecânica e Industrial; and the CEMMPRE projects UIDB/00285/2020 and LA/P/0112/2020. References Branco, R., Costa, J. D., Martins Ferreira, J. A., Capela, C., Antunes, F. V., Macek, W. 2021. Multiaxial fatigue behaviour of maraging steel produced by selective laser melting. Materials and Design 201, 109469. Campbell, F.C., Ed., 2012. Fatigue and Fracture. ASM International. doi: 10.31399/asm.tb.ffub.9781627083034. Cunha, B.I.S., 2024. Study of the phenomenon of fatigue crack initiation in AlSi10Mg aluminum alloy produced by LB-PBF subjected to combined bending-torsional loading. Department of Mechanical Engineering, University of Coimbra, Master’s thesis [in Portuguese]. Fernandes, R. F., Jesus, J. S., Branco, R., Borrego, L. P., Costa, J. D., Ferreira, J. A. M., 2022. Influence of post-processing heat treatment on the cyclic deformation behaviour of AlSi10Mg aluminium alloy subjected to laser powder bed fusion. International Journal of Fatigue 164, 107157. 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 Mata, L.B., 2024. Fatigue life prediction of notched aluminium specimens produced by SLM under bending-torsion and torsion-tension. Department of Mechanical and Industrial Engineering, NOVA University Lisbon, Master’s thesis. 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. Sanaei, N., Fatemi, A., 2021. Defects in additive manufactured metals and their effect on fatigue performance: A state-of-the-art review. Progress in Materials Science 117, 100724. Zhu, S.P., He, J.C., Liao, D., Wang, Q., Liu, Y., 2020. The effect of notch size on critical distance and fatigue life predictions. Materials and Design 196, 109095.