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Outlook of Preisach Modeling and Magnetic Non Destructive Testing

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Abstract:

The Preisach formalism is used as a basis for a vector model of magnetic hysteresis in soft magnetic materials subject to tensile stress. The model uses as vector elementary hysteresis operator the Stoner-Wohlfarth mechanism of coherent rotation while the Preisach density is constructed as the weighed sum of probability density functions corresponding to the high and low induction regions. The model reproduces the basic phenomenology of stress-dependent hysteresis: the double peak in differential permeability modeled as the effect of internal demagnetizing fields emerging from residual stresses; the increase in coercivity due to increased pinning; the decrease in magnetic induction as the result of non-180o domain rotation. The role of the negative differential permeability near remanence and its derivative is discussed with respect to residual stresses and magnetic NDT.

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Periodical:

Key Engineering Materials (Volume 543)

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1-4

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.543.1

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Online since:

March 2013

Authors:

Aphrodite Ktena, Evangelos Hristoforou

Keywords:

Hysteresis, Negative Differential Susceptibility, Stress Induced Demagnetizing Fields, Vector Modeling

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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