Numerical scheme for the simulation of the Eddy Current Magnetic Signature (ECMS) non-destructive micro-magnetic technique

Takanori Matsumoto (1) , Benjamin Ducharne (2) , Tetsuya Uchimoto (3, 4)

1 Tohoku University [Sendai]
2 LGEF - Laboratoire de Génie Electrique et Ferroélectricité
3 ELyTMaX
4 IFS - Institute of Fluid Sciences [Sendai]

Residual stresses inevitably occur in metallic components due to industrial machining or heat treatment processes. These local micro-residual stresses affect real-life performance of industrial parts. Measurements and analysis of residual stresses are necessary for quality assurance and maintenance anticipations. Local magnetization processes are highly dependent on the distribution of the residual stresses. Consequently, the use of micro-magnetic techniques such as the Magnetic Barkhausen Noise (MBN) [1][2] or the Magnetic Incremental Permeability (MIP) [3][4] has increased exponentially in the industrial field. In [5], authors propose a new micro-magnetic technique called Eddy Current Magnetic Signature (ECMS) particularly effective for the mapping of these residual stresses. The ECMS experimental setup is similar to the MIP's one The ECMS method consist on plotting the evolution of the real versus imaginary part of the EC probe impedance during minor loop situation. The industrial use of the micro-magnetic characterization techniques is very empirical: based on experimental data obtained from well-known samples, operators set thresholds of validation. Once rejected, the targeted samples are destroyed and no extra investigations are done to determine the origin of the defects. In the extended version of this abstract, a precise description (experimental setup, data treatment …) of the ECMS method will be done first. Then, a numerical method relying on physical properties will be proposed for the simulation of the ECMS technique. As ECMS is a particularly sensitive experimental method, the accuracy of the model is a key property. A Time domain, 1 dimension space discretized resolution is proposed. The Jiles-Atherton (J-A) scalar hysteresis model is used for the quasi-static contribution (hysteresis losses) [6]. The dynamic behavior is simulated by the simultaneous resolution of both the diffusion equation (classical losses) and a material law (excess losses) [7], [8]. For this study, a carbon steel SB410 (JIS G3103) has been investigated (Tab. 1)

Mots clés: Eddy current magnetic signature (ECMS); hysteresis model; mechanical stress

Domaines: Physique [physics]; Sciences de l'ingénieur [physics]

Takanori Matsumoto, Benjamin Ducharne, Tetsuya Uchimoto. Numerical scheme for the simulation of the Eddy Current Magnetic Signature (ECMS) non-destructive micro-magnetic technique. 2019 Joint MMM-Intermag, Jan 2019, Jan 2019, Washington, United States. ⟨hal-02560984⟩