PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 59 (2024) 3–10

© 2024 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 DMDP 2023 Organizers Abstract An important damage process is the uncertainties in the prediction of stress corrosion crack propagation, which, even nowadays, poses a challenge in determining the reliability probability of power plant equipment. There are three main methods for its investigation, the constant displacement, the constant load, and the slow strain rate tests, from which the last one is very expensive and the operating conditions (e.g., pressure, temperature) typical of nuclear power plants are difficult to achieve. Therefore, for primary circuit corrosion tests, an experimental set-up has been developed by VEIKI Kft. where pressure, temperature and saturation operating conditions in the primary or secondary circuit can be simultaneously maintained in several pressure vessels – so called capsules – using heating furnaces. With this testing equipment constant displacement tests are feasible, but the size of the equipment requires the design of a new test specimen on which it is easy to perform both the pre cracking and the pre-loading. For this purpose, a new hybrid specimen was developed where the advantages of the DCB and CT specimens were combined. However, in this case, the resulting test specimen cannot be pre-loaded in a standard way; therefore, a formula was established for the calculation of the stress intensity factor to simplify this process. The steps of the equation generation procedure are introduced in this article. © 2024 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 DMDP 2023 Organizers Keywords: Hybrid specimen; Stress intensity factor; SIF; Finite element simulation. VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Analytical determination of the stress intensity factor of a hybrid CT specimen Bernadett Spisa ´ k a,b *, Szabolcs Sza ´ vai a,b a Bay Zoltan Nonprofit Ltd. for Applied Research, Igloi street 2, Miskolc 3519, Hungary b University of Miskolc, Miskolc-Egyetemvaros 3515, Hungary

* Corresponding author. Tel.: +36-70-709-3675 E-mail address: bernadett.spisak@bayzoltan.hu

2452-3216 © 2024 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 DMDP 2023 Organizers

2452-3216 © 2024 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 DMDP 2023 Organizers 10.1016/j.prostr.2024.04.002