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) 310–317

European Conference on Fracture 2024 Comparing Direct Method and Backpropagation method in Determining GTN Parameters: A Quantitative Study Chahboub Yassine a, *, Szavai Szabolcs b a University of Dunaujvaros Institute of Engineering Sciences,2400, Dunaujvaros, Hungary b Structure Integrity and Production Technologies Department at Bay Zoltan nonprofit ltd. for Applied Research Abstract GTN model is among the best models that simulate crack growth at the microscopic level. Estimating crack propagation is vitally important to ensure an effective operation of different equipment and avoid breakdowns, especially in the field of nuclear energy. However, the GTN parameters determination is a complicated process that requires much time and analysis. Several studies have dealt with this problem and tried different methods to determine GTN parameters, some examples being the direct method, and the backpropagation method . My main objective in this work was to do a quantitative comparison among the direct method and the backpropagation approach and to find out the best and the method which is fully optimized for the GTN parameters. © 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: direct method ; backpropagation method ; GTN parameters 1. Introduction Design lifetime for the majority of nuclear reactors built in the last century is almost expired or has already expired. Still, according to Peter Trampus (2019), operational life spans can be elaborated at NPPS for several years. Such an extension should be approved based on the proof that the integrity and safety of the critical components are guaranteed © 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 E-mail address: chahboubyassine@gmail.com

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.2025.06.059