PSI - Issue 37

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect il l li i i

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 37 (2022) 269–273

© 2022 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 Pedro Miguel Guimaraes Pires Moreira Abstract Results of extensive experiments involving the fatigue behaviour of welded structures which are a part of the “Gazela” bridge in Belgrade, Serbia, are presented in this paper. After non-destructive testing of these structures, crack-like defects were detected, and welded plates containing them were taken out for the purpose of destructive testing. This testing involved tensile tests, impact testing using an instrumented Charpy pendulum and fatigue tests, from which the S-N curves were obtained. Based on these results, fracture mechanics parameters were determined, including crack tip opening, critical J-integral, stress intensity factors and critical crack length. In addition, fatigue tests, which involved four-point bending of standard Charpy specimens provided da/dN- ΔK curves, which were then used in order to determine Paris Law coefficient, C and m. Obtained results are of great importance in order to better understand the behaviour of large-scale welded structures subjected to both static and dynamic (cyclic) loads, such as bridges. © 2022 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) 1. Introduction Long history of cracking and other problems with steel construction of Gazela bridge in Belgrade resulted in extensive repair and reconstruction programme, including testing of welded joints which are crucial for its safe exploitation, [1-5]. Since non-destructive testing detected many crack-like defects, extensive testing was performed, like tensile testing, impact testing using an instrumented Charpy pendulum and fatigue tests, from which the S-N curves obtained. Anyhow, focus in this paper is on the use of Paris Law coefficient, C and m, obtained from da/dN ΔK curves, to calculate structural life, as shown in recently published papers, [6-12]. Obtained results are of great © 2 A o s b S I This is an open access article under the CC BY-NC-ND license (htt ICSI 2021 The 4th International Conference on Structural Integrity Analysis of fatigue behaviour of a bridge welded structure Zijah Burzi ć a , Aleksandar Sedmak b , Simon Sedmak c , Srđa Perković a , Mihajlo Aran đelović c a Military-Technical Institute, Belgrade, Serbia b University of Belgrade, Faculty of Mechanical Engineering, Serbia c Innovation Center of the Faculty of Mechanical Engineering, Belgrade 35, Serbia Al n b c a r c Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Structural integritz assessment, Kaplan turbine cover, Welded joint defects

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.084