Space discretized ferromagnetic model for non-destructive eddy current testing

Bhaawan Gupta (1, 2, 3) , Benjamin Ducharne (1) , Gael Sebald (2) , Tetsuya Uchimoto (2, 3)

1 LGEF - Laboratoire de Génie Electrique et Ferroélectricité
2 ELyTMaX
3 IFS - Institute of Fluid Science

Accurate magnetic material laws are necessary to understand and interpret electrical signals generated by Eddy Current Testing (ECT) non-destructive control technique. Taking into account simultaneously, both microscopic and macroscopic eddy currents, a numerical resolution is obtained which leads to the global magnetic behavior that can be compared to measured quantities. 2 or 3 dimensional (depending on the dimension of the test sample) finite differences space discretization is used for the resolution of the diffusion equation and dynamic hysteresis model simultaneously and is locally solved for the microscopic eddy currents (domain wall movements) consideration. Local cracks defects are considered in this model as a variation in the local electrical conductivity and magnetic permeability. The numerical implementation of the problem and experimental validations are shown in the article.

Mots clés: Index Terms—Eddy current testing; magnetic hysteresis; electromagnetic modeling

Domaines: Sciences de l'ingénieur [physics]

Bhaawan Gupta, Benjamin Ducharne, Gael Sebald, Tetsuya Uchimoto. Space discretized ferromagnetic model for non-destructive eddy current testing. 21st international conference on the Computation of Electromagnetic Fields COMPUMAG 2017, Jun 2017, Daejeon, South Korea. ⟨hal-01563575⟩