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Calculation of ultrasonic fields radiated in a ferromagnetic medium by an EMAT of arbitrary bias field driven by a current of arbitrary intensity

hal.structure.identifierDépartement Imagerie et Simulation pour le Contrôle (CEA, LIST) [DISC (CEA, LIST)]
dc.contributor.authorROUGE, C.
hal.structure.identifierDépartement Imagerie et Simulation pour le Contrôle (CEA, LIST) [DISC (CEA, LIST)]
dc.contributor.authorLHÉMERY, A.
dc.contributor.authorARISTÉGUI, C.
dc.contributor.authorWALASZEK, H.
dc.date.accessioned2021-05-14T09:47:36Z
dc.date.available2021-05-14T09:47:36Z
dc.date.issued2014
dc.date.conference2013-07-21
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/77058
dc.description.abstractEnElectroMagnetic Acoustic Transducers (EMATs) are contactless transducers generating ultrasonic waves in conductive media, notably shear horizontal and torsional waves (in plates and pipes, respectively), possibly in hostile environments. In a ferromagnetic part, the elastic strain and the magnetic field couple through magnetostriction phenomena, so that a magnetostriction and magnetization forces add up to the Lorentz force created in any conductive medium. Here, a model is proposed to predict these forces for an arbitrary bias field due to the EMAT permanent magnet and whatever the current intensity in its electric circuit, whereas the usual assumption of high bias field and low intensity current leads to important model simplifications. To handle the nonlinear behavior of all the three forces when the usual assumption cannot be made, forces are expressed in the time domain. In particular, magnetostriction force generates waves at several harmonic frequencies of the driving current frequency. Forces are then transformed into equivalent surface stresses readily usable as source terms in existing models of ultrasonic radiation, under the assumption that ultrasonic wavelengths are much longer than force penetration depths, (which is generally true in NDT applications of EMATs). Force spectra computed in various EMAT configurations are compared for illustration.
dc.language.isoen
dc.publisherAmerican Institute of Physics Inc.
dc.title.enCalculation of ultrasonic fields radiated in a ferromagnetic medium by an EMAT of arbitrary bias field driven by a current of arbitrary intensity
dc.typeCommunication dans un congrès avec actes
dc.identifier.doi10.1063/1.4864854
dc.subject.halPhysique [physics]
bordeaux.page450-457
bordeaux.volume1581 33
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.countryUS
bordeaux.title.proceeding40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing
bordeaux.conference.cityBaltimore, MD
bordeaux.peerReviewedoui
hal.identifiercea-01820691
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//cea-01820691v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2014&rft.volume=1581%2033&rft.spage=450-457&rft.epage=450-457&rft.au=ROUGE,%20C.&LH%C3%89MERY,%20A.&ARIST%C3%89GUI,%20C.&WALASZEK,%20H.&rft.genre=proceeding


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