PSI - Issue 58

ScienceDirect Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 58 (2024) 87–94

© 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 the ICSID 2023 Organizers Abstract The goal of this research was to combine non-destructive test methods, specifically modern ultrasound testing techniques with numerical simulations via finite element method, to determine the risk of failure of a pressure vessel in the reversible hydropower plant “Bajina Bašta”. Using Phased Array Ultrasonic Technique and Time of Flight Diffraction technique, a crack with a length of 75 mm and depth of 20 mm was detected inside the pressure vessel wall, in the vertical welded joint. Based on the exact position and size of the crack, a numerical model was made in ABAQUS. Two models were made, with and without the crack, for comparison purposes. Since the obtained results did not show difference, it was decided to make another model, with different boundary conditions, providing a more realistic insight into the behaviour of the pressure vessel, which still remained in the safe zone. © 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 the ICSID 2023 Organizers Keywords: Pressure vessel 970; Phased Array Ultrasonic Testing; Time of Flight diffraction; finite element method; internal crack 1. Introduction Reversible hydropower plant “Bajina Bašta” has been now operating for over 40 years, and has been subjected to regular maintenance and inspection, to ensure safe and reliable exploitation. Various tests, both destructive and non- destructive had been performed in order to assess the structural integrity of various equipment in the powerplant. Abstract The goal of this research was to combine non-destructive test methods, specifically modern ultrasound testing techniques with numerical simulations via finite element method, to determine the risk of failure of a pressure vessel in the reversible hydropower plant “Bajina Bašta”. Using Phased Array Ultrasonic Technique and Time of Flight Diffraction technique, a crack with a length of 75 mm and depth of 20 mm was detected inside the pressure vessel wall, in the vertical welded joint. Based on the exact position and size of the crack, a numerical model was made in ABAQUS. Two models were made, with and without the crack, for comparison purposes. Since the obtained results did not show difference, it was decided to make another model, with different boundary conditions, providing a more realistic insight into the behaviour of the pressure vessel, which still remained in the safe zone. © 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 the ICSID 2023 Organizers Keywords: Pressure vessel 970; Phased Array Ultrasonic Testing; Time of Flight diffraction; finite element method; internal crack 1. Introduction Reversible hydropower plant “Bajina Bašta” has been now operating for over 40 years, and has been subjected to regular maintenance and inspection, to ensure safe and reliable exploitation. Various tests, both destructive and non- destructive had been performed in order to assess the structural integrity of various equipment in the powerplant. 7th International Conference on Structural Integrity and Durability (ICSID 2023) Integrity assessment of a crack inside a pressure vessel wall in RHPP “Bajina Bašta” Mirjana Opačić a , Simon Sedmak a,* , Aleksandar Sedmak b,c , Lazar Jeremić a , Nikola Milovanović a 7th International Conference on Structural Integrity and Durability (ICSID 2023) Integrity assessment of a crack inside a pressure vessel wall in RHPP “Bajina Bašta” Mirjana Opačić a , Simon Sedmak a,* , Aleksandar Sedmak b,c , Lazar Jeremić a , Nikola Milovanović a a Innovation Center of Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia d Transilvania University of Brasov, Faculty of Civil Engineering, Turnului st. 5, 500152 Bra ș ov, România a Innovation Center of Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia b University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia d Transilvania University of Brasov, Faculty of Civil Engineering, Turnului st. 5, 500152 Bra ș ov, România

* Corresponding author. Tel.: +381-62-295-496 E-mail address: simon.sedmak@yahoo.com * Corresponding author. Tel.: +381-62-295-496 E-mail address: simon.sedmak@yahoo.com

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 the ICSID 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 the ICSID 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 the ICSID 2023 Organizers 10.1016/j.prostr.2024.05.015