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

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Procedia Structural Integrity 68 (2025) 687–693

European Conference on Fracture 2024 Digital Twin based simulations for the evaluation of small-scale tensile specimen tests T. Fekete a, *, D. Antók a , L. Tatár a , P. Bereczki b

a Centre for Energy Research, Konkoly-Thege M. str. 29-33., Budapest H-1121, Hungary b University of Du n aúj v á ros , Táncsics Mihály str. 1/A, Dunaújváros H-2400, Hungary

Abstract In recent years, a data acquisition system has been built to perform tensile tests. The system is equipped with cameras that can capture the deformation evolution with high temporal resolution during the tests. Specimen dimensions are measured using a high accuracy coordinate measuring system, which provides a detailed coordinate map. Simultaneously, Finite Element models based on the Digital Twin concept have been developed to simulate tensile tests. This study examines whether applying measured geometric imperfections to a Finite Element model provides more reliable results than the investigation with conventional idealized geometric models. Three models are investigated: one with nominal dimensions, one with measured average dimensions, and one with the implementation of the measured coordinate map. Simulation results show that the model based on realistic initial geometry follows the measured results much more accurately than those based on idealized geometry. © 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) © 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

Peer-review under responsibility of ECF24 organizers Keywords: Digital Twin; Tensile Test; Plastic Deformation

1. Introduction A topic of considerable interest within the power generation industry at the present time is the question of extending the licensed service lifetime of NPP s to the Long-Term Operation period, defined as 70-80 years of operation (Katona, Biró, Rátkai, 2023).

* Corresponding author. Tel.: +36-1-392-2222 / 3403; fax: +36-1-395-9293. E-mail address: fekete.tamas@ek.hun-ren.hu

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.2025.06.116