Non-destructive crack detection by capturing local flux leakage field

Abstract

The crack detection in the industrial machine parts is very important. The non-destructive crack detection and evaluation of the these cracks are highly desirable from the viewpoint of safe and economic operation of installed facilities such as industrial factories and power plants. A crack induces local damages in the magnetic flux path in a ferromagnetic material and any change in crack area results in change in the distribution of magnetic flux in the material. In this paper, variation of the magnetic flux distribution in locally magnetised ferromagnetic materials which has discontinuity as a crack, is studied.