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A Model of Metal Magnetic Memory Crack Testing on a Rectangular Parallelepiped

Based on the Biot-Savart law, a model of metal magnetic memory (MMM) testing for detecting discontinuities, such as cracks, on the surface of a rectangular parallelepiped is proposed. An analyt-ical expression of normal magnetic strength on the surface of the material is presented. With this model, the location, shape, and dimensions of a crack can be detected by the MMM testing curve.


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