An instrument designed to measure the a-c field accurately has been built and fully tested on steel, aluminium, and titanium. These field measurements can be interpreted in terms of crack size, which provides a new technique for nondestructive testing (NDT) that requires no prior calibration. This paper describes the basic electronic measuring system, theoretical derivations of the electrical-field distribution, and application to industrial problems such as crack measurement in threads, shafting, welded connections, etc.
An analytical solution to the electromagnetic induction problem involving both electrical anisotropy and magnetic anisotropy has been derived. The method of solution can be extended to electromagnetic induction problems in infinite plates and layered media. A theoretical model for measuring magnetic field change under a uniaxial stress based on anisotropic electromagnetic induction has also been developed. An experiment designed to measure the effect of mechanical stress on magnetic permeability has been carried out. Theoretical predictions of relative magnetic field change are in good agreement with the experimental data.
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