For a lot of mechanical steel components during service, corrosion-fatigue is a very interesting and dangerous damage situation consisting in the combination of fatigue loading and chemical aggression due to environment. In particular, the effects of corrosion on fatigue properties are characterized by the formation of a wide-spread distribution of surface flaws, whose nucleation is favored by the pits due to the aggressive environment and whose dimension increases with the number of cycles. The possibility to monitor the development of corrosion-fatigue damage pattern of railway axles made in A1N steel was here preliminarily explored. The relevant conclusions can be so summarised: an experimental methodology for reproducing the natural corrosion-fatigue damage pattern of axles on small-scale specimens was previously designed by the authors and here adopted to realise effective sample blocks to be used to calibrate ET inspections; a dedicated equipment was designed to make repeatable measurements and to have the possibility to control all the relevant parameters of ET inspections; a clear correlation between the corrosion-fatigue damage pattern and ET responses seems to be present; it is necessary to extend the number of inspected sample blocks in order to statistically generalised the obtained results.
Application of eddy currents to the estimation of corrosion-fatigue damage
Anwendung von Wirbelströmen auf die Abschätzung von Korrosions-Ermüdungsschäden
2010
10 Seiten, 10 Bilder, 15 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
Application of eddy currents to the inspection of fatigue-corroded railway axles
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