Issue 42

Correia et alii, Frattura ed Integrità Strutturale, 42 (2017) 136-146; DOI: 10.3221/IGF-ESIS.42.15 136 Focused on Mechanical Fatigue of Metals Statistical analysis of fatigue crack propagation data of materials from ancient portuguese metallic bridges J.A.F.O. Correia, A.M.P. De Jesus, R. Calçada Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. jacorreia@inegi.up.pt , http://orcid.org/0000-0002-4148-9426 ajesus@fe.up.pt , http://orcid.org/0000-0002-1059-715X ruiabc@fe.up.pt , http://orcid.org/0000-0002-2375-7685 B. Pedrosa, C. Rebelo, Luis Simões da Silva ISISE, Department of Civil Engineering, University of Coimbra, Rua Luís Reis Santos, Pólo II, 3030-788 Coimbra, Portugal. brunoalex_pedrosa@hotmail.com , crebelo@dec.uc.pt G. Lesiuk Faculty of Mechanical Engineering, Department of Mechanics, Material Science and Engineering, Wrocław University of Science and Technology, Smoluchowskiego 25, 50-370 Wrocław, Poland Grzegorz.Lesiuk@pwr.edu.pl , https://orcid.org/0000-0003-3553-6107 A BSTRACT . In Portugal there is a number of old metallic riveted railway and highway bridges that were erected by the end of the 19 th century and beginning of the 20 th century, and are still in operation, requiring inspections and remediation measures to overcome fatigue damage. Residual fatigue life predictions should be based on actual fatigue data from bridge materials which is scarce due to the material specificities. Fatigue crack propagation data of materials from representative Portuguese riveted bridges, namely the Pinhão and Luiz I road bridges, the Viana road/railway bridge, the Fão road bridge and the Trezói railway bridge were considered in this study. The fatigue crack growth rates were correlated using the Paris’s law. Also, a statistical analysis of the pure mode I fatigue crack growth (FCG) data available for the materials from the ancient riveted metallic bridges is presented. Based on this analysis, design FCG curves are proposed and compared with BS7910 standard proposal, for the Paris region, which is one important fatigue regime concerning the application of the Fracture Mechanics approaches, to predict the remnant fatigue life of structural details. K EYWORDS . Fracture Mechanics; Fatigue Crack Growth; Statistical Analysis; Old Steels; Ancient Bridges; BS7910. Citation: Correia, J.A.F.O., De Jesus, A.M.P., Calçada, R., Pedrosa, B., Rebelo, C., Simões da Silva, L., Lesiuk, G., Statistical Analysis of Fatigue Crack Propagation Data of Materials from Ancient Portuguese Metallic Bridges, Frattura ed Integrità Strutturale, 42 (2017) 136-146. Received: 08.06.2017 Accepted: 17.06.2017 Published: 01.10.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.