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Metal Magnetic Memory Testing of the Drilling Riser Pipeline Steel Based on Pulsating-Impact-Fatigue Test

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Abstract:

To know the fatigue damage state of X80 pipeline steel which is used for the drilling riser and prevent the occurrence of fatigue fracture accidents. Pulsating-impact-fatigue tests were conducted in laboratory, magnetic memory signals were measured during the whole fatigue process. The distribution of stress and magnetic field vector with different crack depth was analyzed by using finite element (FE) method. During fatigue crack initiation stage, magnetic signals increased slowly with fatigue loading cycles because of the effect of stress-magnetization. When fatigue crack appeared, magnetic signals were mainly affected by magnetic flux leakage (MFL) which was induced by fatigue crack. Magnetic memory characteristic parameters had a good linear relationship with fatigue crack depth. Magnetic memory signals were able to reflect the change of fatigue damage status.

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Periodical:

Materials Science Forum (Volume 975)

Pages:

15-24

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.975.15

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Online since:

January 2020

Authors:

Wei Zhou*, Jian Chun Fan, Xiang Yuan Liu, Shu Jie Liu

Keywords:

Fatigue Crack, Finite Element, Magnetic Dipole Model, Magnetic Memory Signals, X80 Pipeline Steel

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© 2020 Trans Tech Publications Ltd. All Rights Reserved

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