Analysis of incremental and differential permeability in NDT via 3D-simulation and experiment

Gabi, Yasmine; Jacob, Kiran; Wolter, Bernd; Conrad, Christian; Straß, Benjamin; J.Grimm,

doi:10.1016/j.jmmm.2020.166695

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…More precisely and according to the German standard DIN1324 (part II: magnetic field for material quantities [35,36]), the Magnetic Incremental Permeability (MIP, μMIP) is defined as the slope of inner asymmetric loops (Equation (2), Figure 8). These loops, also called minor cycles, are obtained when the tested material is exposed to the superimposition of two magnetic contributions: B a (H surf ) hysteresis cycles are firmly tensile stress-dependent and could be considered for σ observation.…”

Section: Magnetic Incremental Permeabilitymentioning

confidence: 99%

Characterization of Tensile Stress-Dependent Directional Magnetic Incremental Permeability in Iron-Cobalt Magnetic Sheet: Towards Internal Stress Estimation through Non-Destructive Testing

Toutsop

Ducharne

Lallart

et al. 2022

Sensors

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Iron-Cobalt ferromagnetic alloys are promoted for electrical energy conversion in aeronautic applications, but their high magnetostrictive coefficients may result in undesired behaviors. Internal stresses can be tuned to limit magnetostriction but must be adequately assessed in a non-destructive way during production. For this, directional magnetic incremental permeability is proposed in this work. For academic purposes, internal stresses have been replaced by homogenous external stress, which is easier to control using traction/compression testbench and results in similar effects. Tests have been limited to tensile stress stimuli, the worst-case scenario for magnetic stress observation on positive magnetostriction coefficient materials. Hysteresis cycles have been reconstructed from the incremental permeability measurement for stability and reproducibility of the measured quantities. The directionality of the sensor provides an additional degree of freedom in the magnetic response observation. The study reveals that an angle of π/2 between the DC (Hsurf DC) and the AC (Hsurf AC) magnetic excitations with a flux density Ba at HsurfDC = 10 kA·m−1 constitute the ideal experimental situation and the highest correlated parameter to a homogeneous imposed tensile stress. Magnetic incremental permeability is linked to the magnetic domain wall bulging magnetization mechanism; this study thus provides insights for understanding such a mechanism.

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Section: Magnetic Incremental Permeabilitymentioning

confidence: 99%

Characterization of Tensile Stress-Dependent Directional Magnetic Incremental Permeability in Iron-Cobalt Magnetic Sheet: Towards Internal Stress Estimation through Non-Destructive Testing

Toutsop

Ducharne

Lallart

et al. 2022

Sensors

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“…D'aquino et al [47] considered a whole single sheet tester that is spatially discretized and simulated, the Jiles-Atherton model in its vector form is used for the local hysteresis consideration. Finally, Y. Gabi et al [48] tested and simulated a yoke probe head and a pancake-type sensors. A 3D dynamic vector model is developed and gives correct simulation results for the incremental and differential permeabilities.…”

Section: Magnetic Incremental Permeability Simulationmentioning

confidence: 99%

Comparison of electromagnetic inspection methods for creep-degraded high chromium ferritic steels

Gupta

Ducharne

Uchimoto

et al. 2021

NDT & E International

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Nondestructive testing (NDT) techniques are used to evaluate the material degradation of ferromagnetic materials, for example, in sensitive environments, such as thermal power plants, where the materials are subjected to creep damage. There is no consensus on the use of an electromagnetic NDT technique to characterize the evolution of creep damage in high-chromium ferritic steels. In this work, an overview and comparison of three different electromagnetic NDT techniques that were applied to high-chromium steels is provided to understand creep evolution in terms of microstructural changes, such as precipitation, dislocation and grain size. To quantify the empirical measurements, a modeling technique was proposed for each applied method. The model parameters were optimized for each NDT technique and tested material. Depending on the model parameters, the accuracy of the parameter determination depends strongly on the NDT technique, which indicates its correlation with the microstructural information.

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“…Currently, there are a number of nondestructive testing (NDT) methods, such as x-ray diffraction [6], * Author to whom any correspondence should be addressed. ultrasonic waves [7], eddy currents [8], and metal magnetic memory [9], that can be used to measure the mechanical properties of materials, but there are limitations to their testing efficiency and sensitivity [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Theoretical model of magnetoacoustic emission considering the microstructure of ferromagnetic material

Zhang,

Jiao,

et al. 2023

Meas. Sci. Technol.

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Magnetoacoustic emission (MAE) holds great promise for evaluating the mechanical properties of ferromagnetic materials. To refine the problems of the current theoretical and numerical models of MAE, a theoretical MAE model that considers the microscopic dependence of the hysteresis properties is proposed in this paper. The microstructure (dislocation density and grain size) and the correlation of MAE jumps are considered and incorporated into the model. Then, the influences of magnetization parameters and microstructure parameters on the envelope of the MAE signal are analyzed by the proposed theoretical model. The proposed theoretical model is then fully evaluated by simulations and experiments. The MAE experiments are conducted on ferromagnetic specimens with different hardnesses, and the MAE signals with different hardnesses are simulated by inverting the basic parameters of the MAE model with the genetic algorithm. Further, the crucial hysteresis parameters of the specimens are calculated using the results of microscopic measurements and the calculated parameters agree well with inversion results from experimental signals. The results demonstrate that the proposed theoretical model is valid for the MAE signal simulation. The trends of different hardnesses can be predicted by the MAE simulation signals. Moreover, the model can be used for theoretical analysis of the microscopic dependence of the MAE signal.

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Analysis of incremental and differential permeability in NDT via 3D-simulation and experiment

Cited by 12 publications

References 13 publications

Characterization of Tensile Stress-Dependent Directional Magnetic Incremental Permeability in Iron-Cobalt Magnetic Sheet: Towards Internal Stress Estimation through Non-Destructive Testing

Characterization of Tensile Stress-Dependent Directional Magnetic Incremental Permeability in Iron-Cobalt Magnetic Sheet: Towards Internal Stress Estimation through Non-Destructive Testing

Comparison of electromagnetic inspection methods for creep-degraded high chromium ferritic steels

Theoretical model of magnetoacoustic emission considering the microstructure of ferromagnetic material

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