PSI - Issue 68

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 835–838

European Conference on Fracture 2024 Fracture stress triaxiality of Ti-6Al-4V for computational design of damage tolerant aeroengines Víctor Tuninetti a, *, Carlos Beecher b , Héctor Sepúlveda b,c , Laurent Duchêne c , Angelo Oñate d , Gonzalo Pincheira e a Department of Mechanical Engineering, Universidad de La Frontera, Temuco, Chile b Master Program in Engineering Sciences, Faculty of Engineering, Universidad de La Frontera, Temuco, Chile c ArGEnCo-MSM, University of Liège, 4000 Liège, Belgium d Department of Materials Engineering (DIMAT), Faculty of Engineering, Universidad de Concepción, Concepción, Chile e Department of Industrial Technologies, Faculty of Engineering, University of Talca, Camino a Los Niches Km 1, Curicó, Chile Abstract Fracture stress triaxiality affects the maximum deformation of materials, and reliable computational design of damage-tolerant aircraft depends on accurate predictions of this state variable. This numerical study analyses the effect of fracture stress triaxiality on the damage behavior of Ti-6Al-4V during aero-engine fan blade-out events using explicit dynamic finite element analysis. Experimental data used in previously reported model calibration are compared with analytical predictions of the Johnson-Cook damage model and with preliminary simulation results of stress-triaxiality at fracture in the shroud due to a fan blade-out. This analysis is necessary to ensure that the structural integrity assessment with the identified model is consistent with the stress triaxiality range observed in the real case of damaged engine shroud. The main result emphasizes the importance of adequate experimental calibration for accurate modelling of structural assessment of aeroengines. © 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: stress triaxiality; Ti-6Al-4V; aeroengines; computational fracture mechanics; fracture strain © 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. Tel.: +56 45 2325984; E-mail address: victor.tuninetti@ufrontera.cl

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.2025.06.138