Nondestructive control of objects made of electroconductive materials in pulsed magnetic fields

Calculation of residual magnetic-field distributions upon hysteretic interference of a pulsed magnetic field

“…The aim of the present study is to develop a hysteretic interference method for the inspection of objects that are made from electoconductive and magnetic materials, which increases the accuracy of determina tion of their specific electrical conductivity σ, magnetic permeability μ, uniformity of σ and μ distribu tions, thickness, and parameters of discontinuity flaws in the materials. In this case, the development of the aforementioned method is realized via the application of digital calculations that are performed with the Delphi programming language.The phenomenon of hysteretic interference of the magnetic field, which consists in the appearance of regular maxima and minima in the distributions of remanent magnetization of a magnetic medium that result from the action of different polarity magnetic field pulses applied to it, was considered in [1][2][3]. The possibilities of the selection of electroconductive objects based on the time constant of the transition process in applying rectangular magnetic field pulses to an object were discussed in [4], in which a tran sition process method was used and the induction flux through a test object was calculated.…”

“…The phenomenon of hysteretic interference of the magnetic field, which consists in the appearance of regular maxima and minima in the distributions of remanent magnetization of a magnetic medium that result from the action of different polarity magnetic field pulses applied to it, was considered in [1][2][3]. The possibilities of the selection of electroconductive objects based on the time constant of the transition process in applying rectangular magnetic field pulses to an object were discussed in [4], in which a tran sition process method was used and the induction flux through a test object was calculated.…”