ROUGE, C.; LHÉMERY, A.; ARISTÉGUI, C.

doi:10.1088/1742-6596/498/1/012013

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

ROUGE, C.
Département Imagerie et Simulation pour le Contrôle (CEA, LIST) [DISC (CEA, LIST)]

LHÉMERY, A.
Département Imagerie et Simulation pour le Contrôle (CEA, LIST) [DISC (CEA, LIST)]

ARISTÉGUI, C.

Langue

Article de revue

Ce document a été publié dans

Journal of Physics: Conference Series. 2014, vol. 498, n° 1

Résumé en anglais

Electro-magnetic acoustic transducers (EMAT) are successfully used in many NDE applications, despite their low efficiency: they do not require a coupling medium and can easily generate elastic waves that standard piezoelectric transducers cannot, such as shear horizontal guided waves. There are all sorts of EMAT designs, so much so that dedicated simulation tools are necessary to optimally conceive an EMAT for a given application. EMAT performances also strongly depend on material properties of the piece under test. Here, ferromagnetic materials are considered. In such a material, an EMAT is the source of three forces resulting from three distinct and generally nonlinear phenomena: in addition to the Lorentz's force generated in all conductive media, the magnetization and magnetostriction forces take place. All these forces are modelled as vector fields in the volume of the specimen. However, wave generation is more efficiently predicted by considering sources of surface stress than sources of body force. Thus, a general model is derived for transforming body forces into surface stresses; this approach is used to express the 2D modal amplitudes of Lamb waves generated by an EMAT in a ferromagnetic plate as quasi-closed form solutions.< Réduire

Mots clés en anglais

Elastic waves

Ferromagnetic materials

Ferromagnetism

Guided electromagnetic wave propagation

Nondestructive examination

Shear flow

Surface properties

Surface waves

Conductive media

Coupling medium

Electromagnetic acoustic transducers

Ferromagnetic plate

Non-linear phenomena

Quasi-closed-form solutions

Shear horizontal guided waves

Wave generation

Acoustic transducers

Métadonnées

Partager cette publication !

Licence d’utilisation du document

EMAT generation of bulk forces in a ferromagnetic plate and their equivalent surface stresses

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

URI

DOI

Origine

Unités de recherche