Abstract
Non-destructive methods of material properties evaluation are presented in the paper. The methods are useful especially for increasing the safety of sophisticated and environment threatening facilities and, consequently, for decreasing the operating expenditures of those facilities. The attention is paid mainly to the method that utilises eddy currents induced in the surface layer of conducting samples by means of a small flat coil. The eddy current testing method is theoretically described and results of its particular application are presented in the paper.
Highlights
The present-day period is characteristic of a fast development of sophisticated technologies
A non-destructive testing (NDT) of materials properties plays an important role among them as a tested structure is not damaged during the inspection and usually there is no need for disassembling of the tested structure
The importance of the non-destructive testing (NDT) of materials was emphasized in the paper
Summary
The present-day period is characteristic of a fast development of sophisticated technologies. ● External electromagnetic field generates strongly attenuated electromagnetic wave known as the skin effect in the surface layer of a conducting sample. It is connected with existence of induced eddy currents. Non-destructive eddy current testing (ECT) is utilized for non-contact inspection of conducting bodies This method is described in detail in [6 – 12] and in the present paper. The EC depth of penetration is limited by the skin effect, the method is applicable only for detection of surface and near subsurface defects or for the volumetric inspection of thin materials. In the transient regions (region 2), the conductivity profile was estimated by using the neural network (NN) for
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