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Eddy‐current induction in a uniaxially anisotropic plate

 

作者: S. K. Burke,  

 

期刊: Journal of Applied Physics  (AIP Available online 1990)
卷期: Volume 68, issue 7  

页码: 3080-3090

 

ISSN:0021-8979

 

年代: 1990

 

DOI:10.1063/1.347171

 

出版商: AIP

 

数据来源: AIP

 

摘要:

A theoretical model is presented to describe the time‐harmonic electromagnetic induction of eddy currents in a uniaxially anisotropic plate. The model assumes that the plate is nonmagnetic and that the axis of uniaxial anisotropy is horizontal (i.e., lying in a plane parallel to the surface of the plate). The fields and currents induced by a general magnetic source are obtained by formulating the problem in terms of reduced electromagnetic potentials (Hertzian potentials) and making extensive use of integral transforms. Closed‐form expressions for the reduced potentials are given explicitly, enabling the induced fields to be calculated in all regions provided the free‐space source fields are known. The change in probe‐coil impedance &Dgr;Zdue to eddy‐current induction is considered in detail, and an explicit closed‐form expression for &Dgr;Zis derived for the general case. This general theory is illustrated by calculating &Dgr;Zfor a cylindrical air‐cored coil when (i) the coil axis is normal to the surface of the plate and (ii) the coil axis is tangential to the surface of the plate. The validity of these calculations was established by performing a series of measurements of &Dgr;Zusing an aluminum‐alloy sheet unidirectionally reinforced with boron fibers. The results of the theoretical calculations are in excellent agreement with experiment. The significance of the results for the nondestructive characterization of metal‐matrix composite materials is discussed.

 

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