Title
Testing and numerical simulation of magnetic fields affected by presence of fatigue cracks
Author
van der Horst, M.P.
Kaminski, M.L.
Lepelaars, E.S.A.M.
Publication year
2014
Abstract
Growing applications of high strength steels, which are more sensitive to fatigue, harsher operative environments, and increasing economic value of ship- And offshore structures, such as FPSOs and FLNGs, increase the need for asset integrity management systems. Presently, there are many nondestructive testing methods available. Magnetic methods to monitor fatigue cracks are not yet fully exploited and seem promising due to the possibility of passive monitoring using the Earth magnetic field as source. Measurements and numerical simulations show that magnetic fields in steel structures are affected by the presence of fatigue cracks. A sign change of the out-of-plane magnetic field density can be observed in the vicinity of a crack. Therefore, the crack can be detected by modern Hall probes. This makes it possible to develop a passive crack monitoring system based on magnetism. Copyright © 2014 by the International Society of Offshore and Polar Engineers (ISOPE).
Subject
Physics & Electronics
ED - Electronic Defence
TS - Technical Sciences
High Tech Maritime and Offshore Systems
Industry
Industrial Innovation
Fatigue crack
Ferromagnetism
Magnetic flux leakage
Nondestructive testing
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http://resolver.tudelft.nl/uuid:69fc4cb7-2721-4c15-8543-f4402726c0b8
TNO identifier
516514
Publisher
International Society of Offshore and Polar Engineers, Cupertino, CA
Source
24th International Ocean and Polar Engineering Conference, ISOPE 2014 Busan, 15-20 June 2014, Busan, Korea, 445-450
Document type
conference paper