Abstract
The possibility of application of the eddy current tomography setup to measure the small permeability variations caused by magnetoelastic effect was presented. A ferromagnetic steel sample was prepared for applying wall stresses and measured for 30 MPa stresses. The Finite Element Method (FEM) was utilized to conduct numerical forward tomography transformation for samples of known permeability. Developed forward tomography transformation was applied for single variable inverse tomography transformation, utilized for determining magnetic permeability. This confirmed the possibility of the application of eddy current tomography for quantitative measurements of magnetoelastic effect in samples of known geometry.
Highlights
Magnetoelastic effect is a general name for several different phenomena that consider the mechanical stresses and change of a material’s magnetic properties [1]
The observable effects of those phenomena vary from change of sample dimensions due to external magnetic field via electrical impulses due to a sample’s torsion in the magnetic field (Matteucci effect [3]) to changes in the magnetic state caused by change in the sample’s volume (Nagaoka-Honda effect [4])
The linear tomography transformation were conducted without rotational steps
Summary
Magnetoelastic effect is a general name for several different phenomena that consider the mechanical stresses and change of a material’s magnetic properties [1]. A typical method for measuring this effect is usage of special samples for applying uniform stresses in material and measuring the magnetic hysteresis loop for different stresses values [7]. The sample may be either frame shaped [8] or ring shaped [9]. This method requires special sample preparation in order to obtain closed magnetic circuit and uniform stresses in material. The standard method requires winding of magnetizing and sensing coils on the sample [10]. Sample winding is not required when using a contactless method such as eddy current tomography (ECT)
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