Minimal Invasive Diagnostic Capabilities and Effectiveness of CFRP-Patches Repairs in Long-Term Operated Metals
Grzegorz Lesiuk,
Bruno A. S. Pedrosa,
Anna Zięty,
Wojciech Błażejewski,
Jose A. F. O. Correia,
Abilio M. P. De Jesus,
Cristiano Fragassa
Affiliations
Grzegorz Lesiuk
Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, PL-50-370 Wrocław, Poland
Bruno A. S. Pedrosa
ISISE, Departamento de Engenharia Civil, Universidade de Coimbra, Rua Luís Reis Santos, Pólo II, 3030-788 Coimbra, Portugal
Anna Zięty
Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, PL-50-370 Wrocław, Poland
Wojciech Błażejewski
Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, PL-50-370 Wrocław, Poland
Jose A. F. O. Correia
Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal
Abilio M. P. De Jesus
Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, 4200-465 Porto, Portugal
Cristiano Fragassa
Department of Industrial Engineering, University of Bologna, Viale Risorgimento 6, 40133 Bologna, Italy
The paper deals with the subject of diagnostics and the quick repairs of long-term operated metallic materials. Special attention was paid to historical materials, where the structure (e.g., puddle iron) is different from modern structural steels. In such materials, the processes of microstructural degradation occur as a result of several decades of exposure, which could overpass 100 years. In some cases, their intensity can be potentially catastrophic. For this reason, the search for minimally invasive diagnostic methods is ongoing. In this paper, corrosion and fracture toughness tests were conducted, and the results of these studies were presented for two material states: post-operated and normalized (as a state “restoring” virgin state). Moreover, through the use of modern numerical methods, composite crack-resistant patches have been designed to reduce the stress intensity factors under cyclic loads. As a result, fatigue lifetime was extended (propagation phase) by more than 300%.
