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Approche du bruit magnétomécanique, application au suivi de la fatigue en flexion rotative

Abstract : The magnetomechanical noise corresponds to the reorganisation of the magnetic microstructure of ferromagnetic materials under stress. This phenomenon is due to the mobility of 90° Bloch walls.
Different metallurgical states of 0.1% C steel (annealed, quenched, tempered), were characterised. Results were compared with those obtained by Barkhausen and PTE methods.
Equipment for rotating bending fatigue tests, with in situ measurement of the magnetomechanical noise, was developed. Armco iron was studied under various loads. Results were interpreted in terms of crystalline microstructure and magnetic microstructure interactions, involving magnetic dragging phenomenon. The early beginning of damage can be detected, rejoining the «remaining time of life» evaluation thought process.
Unidimensional modelling of 90°bloch wall motions under stress was proposed.
This approach is at the interface between : micromagnetism, non-destructive testing and internal friction.
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https://tel.archives-ouvertes.fr/tel-00006593
Contributor : Malloum Soultan <>
Submitted on : Tuesday, July 27, 2004 - 4:09:35 PM
Last modification on : Wednesday, July 8, 2020 - 12:42:39 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:36:02 PM

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  • HAL Id : tel-00006593, version 1

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Malloum Soultan. Approche du bruit magnétomécanique, application au suivi de la fatigue en flexion rotative. Mécanique [physics.med-ph]. INSA de Lyon, 2002. Français. ⟨tel-00006593⟩

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