Modélisation des traducteurs électromagnétiques acoustiques (EMAT) pour le contrôle non-destructif (CND) de milieux ferromagnétiques

Abstract : An electromagnetic acoustic transducer (EMAT) induces without contact dynamic sources in a ferromagnetic material which radiate ultrasonic waves used for its nondestructive evaluation (NDE).Taking account of the anhysteretic magnetic and magnetostrictive constitutive laws predicted by a simplified multiscale approach, the transduction model derives the electro-magnetic and magnetostrictive stresses tensors, well-fitted for the definition of electromagnetic and magnetostrictive sources induced by EMAT, irrespective of the piece geometry, of the material properties and of the transducer design.To efficiently predict ultrasonic field radiation with the CIVA platform, a method to transform body sources into equivalent surface stresses is developed. As a result, an equivalent surface source is derived to accurately depict all the transduction processes induced by EMAT in nonlinear magnetic material. The model is used to quantify the weight of each transduction mecanism, to illustrate effects of nonlinear magnetoelastic behaviors of materials, to enlighten the impact of elastic residual stresses on transduction sources. It is applied in a given EMAT NDE configuration to illustrate how the developed tools can help optimizing EMAT design, and its predictions are succesfully compared to experimental measurements.
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  • HAL Id : tel-01767814, version 1

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Bastien Clausse. Modélisation des traducteurs électromagnétiques acoustiques (EMAT) pour le contrôle non-destructif (CND) de milieux ferromagnétiques. Mécanique des solides [physics.class-ph]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLX011⟩. ⟨tel-01767814⟩

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