A New Method for Evaluation of Mechanical Stress Using the Reciprocal Amplitude of Magnetic Barkhausen Noise

Mierczak, Lukasz; Jiles, David; Fantoni, G.

doi:10.1109/tmag.2010.2091418

Cited by 91 publications

(64 citation statements)

References 16 publications

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“…By that, we show that the previously observed bulk relationship between Barkhausen amplitude and stress 15,16 can also be seen in the frequency domain. This result has practical consequences in the area of nondestructive characterization; it introduces the possibility of predicting stress at specific depths inside a magnetic material, solely by measuring the Barkhausen emissions at the surface and analyzing the results in terms of two parameters.…”

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confidence: 75%

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A model for the Barkhausen frequency spectrum as a function of applied stress

Kypris

Nlebedim

Jiles

2014

Journal of Applied Physics

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We derive a two parameter multi-exponential model to describe the frequency spectrum of Barkhausen noise in bulk steel under high excitation rates and applied tensile stress. We show how the amplitude and shape of the frequency spectrum depend on two directly measurable quantities, Barkhausen voltage and effective magnetic permeability, respectively, and how these change with stress. By incorporating frequency and depth dependence components into our model, we provide a framework for identifying stress variations along depth, which can be used for the purposes of non-destructive characterization. KeywordsBarkhausen effects, Domain walls, Emission spectra, Elasticity, Random Noise Disciplines Electromagnetics and Photonics CommentsThe following article appeared in Journal of Applied Physics 115 (2014) We derive a two parameter multi-exponential model to describe the frequency spectrum of Barkhausen noise in bulk steel under high excitation rates and applied tensile stress. We show how the amplitude and shape of the frequency spectrum depend on two directly measurable quantities, Barkhausen voltage and effective magnetic permeability, respectively, and how these change with stress. By incorporating frequency and depth dependence components into our model, we provide a framework for identifying stress variations along depth, which can be used for the purposes of nondestructive characterization. V C 2014 AIP Publishing LLC. [http://dx

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confidence: 75%

“…15,20 This relationship can be derived from an extension to the theory of ferromagnetic hysteresis. 21 The parameter hVi, being the yintercept of the frequency spectrum, represents an extrapolated mean value, which is expected to vary with stress, in a way similar to the peak envelope amplitude and RMS.…”

Section: Theorymentioning

confidence: 99%

A model for the Barkhausen frequency spectrum as a function of applied stress

Kypris

Nlebedim

Jiles

2014

Journal of Applied Physics

Self Cite

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“…The work presented in [5], reported that the vector magnetic property of the electrical steel sheet depends on the mechanical stress and the direction of the magnetic field excitation and has to be taken into account when designing the electrical machine. Moreover, the work in [6] describes a method for detecting stress on the surface of magnetic materials, such as steels, using measurements of magnetic Barkhausen emissions. These results are interesting as they put in evidence the impact of mechanical stress on the local magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Stochastic Modeling of Soft Magnetic Properties of Electrical Steels: Application to Stators of Electrical Machines

2012

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To take account of the uncertainties introduced on the soft magnetic materials properties (magnetic behavior law, iron losses) during the manufacturing process, the present work deals with the stochastic modeling of the magnetic behavior law B-H and iron losses of claw pole stator generator. Twenty eight (28) samples of slinky stator (SS) coming from the same production chain have been investigated. The used approaches are similar to those used in mechanics. The accuracy of existing anhysteretic models has been tested first using cross validation techniques. The well known iron loss separation model has been implemented to take into account the variability of the losses. Then, the Multivariate Gaussian distribution is chosen to model the variability and dependencies between identified parameters, for both behavior law and iron loss models. The developed stochastic models allow predicting a 98% confidence interval for the considered samples.

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“…For materials with positive magnetostriction, the magnetic moments tend to align in parallel to the direction of tensile stress, and perpendicular to compressive stress. In materials with negative magnetostriction, opposite phenomena occurthe magnetic moments tend to align perpendicular to the direction of tensile stress, and in parallel to compressive stress [12,13]. The impact of uniaxial stress on the domain structure can be compared to the effect of a magnetic field with strength H σ which is equivalent to the stress…”

Section: Resultsmentioning

confidence: 99%

Analysis of relationships between residual magnetic field and residual stress

2012

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The impact of stress on changes in magnetisation is one of the most complex issues of magnetism. Magnetic methods make use of the impact of stress on permeability, hysteresis and magnetic Barkhausen noise, which are examined with fields with a high strength and a small frequency. The paper presents an analysis of the impact of residual stress resulting from inhomogeneous plastic deformations in the notch area of the examined samples on the changes in the strength of the residual magnetic field (RMF). The RMF on the surface of the component is the superposition of the simultaneous effect of the shape, the anisotropic magnetic properties of the material, as well as of the values of the components of a weak external magnetic field (most commonly-the magnetic field of the Earth). Distributions of the RMF components were measured on the surface of samples with a various degree of plastic strain. The finite element method was used to model residual stress in the samples. The impact of residual stress on changes in the residual magnetic field was shown. A qualitative correlation was found between places with residual stress and areas with increased values of the gradients of the RMF components. Further research is now in progress in order to develop the quantitative relationships.

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A New Method for Evaluation of Mechanical Stress Using the Reciprocal Amplitude of Magnetic Barkhausen Noise

Cited by 91 publications

References 16 publications

A model for the Barkhausen frequency spectrum as a function of applied stress

A model for the Barkhausen frequency spectrum as a function of applied stress

Stochastic Modeling of Soft Magnetic Properties of Electrical Steels: Application to Stators of Electrical Machines

Analysis of relationships between residual magnetic field and residual stress

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