PSI - Issue 82

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 82 (2026) 16–23

© 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 ICSID organizers Abstract The main purpose of this work is to numerically predict the fatigue life of hollow cylindrical specimens with a through-thickness circular notch, produced by selective laser melting using AlSi10Mg aluminium alloy, under multiaxial fatigue proportional bending-torsion and tension-torsion loading conditions. It aims to compare the effects of these two different load configurations, as well as the influence of a stress-relief heat treatment on the fatigue behaviour of the tested geometry. For both types of loading scenarios, the specimens were subjected to two different normal-to-shear stress amplitude ratios ( s / t = 4/3 and s / t = 2) under pulsating loading. Based on the numerical simulations, the crack initiation location and the early-stage crack growth direction were predicted using the first principal stress field near the notch. The fatigue life was predicted by combining the Theory of Critical Distances with the Smith-Watson-Topper model. From this study, it can be concluded that the crack initiation locations and the early-stage crack growth directions as well as the fatigue lives strongly depend on the s / t ratio. Heat treatment had a negative effect on fatigue life compared to the as-built condition. The application of tension-torsion loading, when compared to bending torsion, also showed a detrimental effect on fatigue life. © 2026 The Authors. Copy from the contract: 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 ICSID organizers / / / 8th International Conference on Structural Integrity and Durability (ICSID2025) Numerical study of fatigue behaviour in notched L-PBF AlSi10Mg aluminium alloy under combined bending-torsion and tension-torsion loading L. Mata a , R. Branco b , L.P. Borrego c,b , R.F. Martins a,d, * a UNIDEMI, Department of Mechanical and Industrial Engineering, Nova School of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal b ARISE, CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal c Department of Mechanical Engineering, Polytechnic of Coimbra, Rua Pedro Nunes, Quinta da Nora, 3030-199 Coimbra, Portugal d Laboratório Associado de Sistemas Inteligentes, LASI, 4800-058 Guimarães, Portugal a b c d

* Corresponding author. E-mail address: rfspm@fct.unl.pt

2452-3216 © 2026 The Authors. Copy from the contract: 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 ICSID 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 ICSID organizers 10.1016/j.prostr.2026.04.004