Magnetic stray field measurements to identify and localise impact-induced plastic deformation in a steel structure

Meijers, P.; Jolink, Chris; Tsouvalas, Apostolos; Metrikine, Andrei V.

doi:10.1016/j.ijmecsci.2021.106990

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…For specimens B1 and B2, which have a considerably higher F max than the other specimens, a larger region of plastic deformation is formed around the crack. As plastic strain reduces the magnetic properties of the material [10], the remanent magnetic field is lower, resulting in a lower change of the mean magnetic field for these two specimens.…”

Section: Mean Of the Magnetic Signalmentioning

confidence: 97%

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Monitoring fatigue crack growth using magnetic stray field measurements

Meijers,

Malschaert,

Veljkovic

2024

J. Phys.: Conf. Ser.

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To monitor the growth of fatigue cracks in steel specimens, several methods exists. In this paper, the magnetic stray field, which is generated by the magnetisation of the specimen, was measured during loading to investigate how to utilise this data to reliably monitor fatigue crack initiation and growth. Data was collected in a series of fatigue tests on Compact Tension specimens with different force ratios. The evolution of the mean value of the dominant stray field component displayed a sensitivity to stress, plastic deformation and displacement of the specimen. By analysing the stress field induced by the loading, these three causes were distinguished from another. Crack initiation was marked by a large change of the mean magnetic stray field. Moreover, the amplitude of the magnetic stray field components showed a clear peak, at which moment 20% of the life time of the specimen is remaining, indicating that the magnetic stray field might provide a useful method to monitor the evolution of fatigue cracks.

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Section: Mean Of the Magnetic Signalmentioning

confidence: 97%

“…Since the magnetisation is (not exclusively) influenced by the stress and the amount of plastic deformation, the mean magnetic stray field B reflects the current and past stress state of the material. A change of the mean magnetic field B with increasing crack length is measured in the following three situations [10]:…”

Section: Mean Of the Magnetic Signalmentioning

confidence: 99%