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.
Bowler, John R., and Nicola Bowler, 2002, “Evaluation of the Magnetic Field Near a Crack with Application to Magnetic Particle Inspection,” Journal of Physics D: Applied Physics, Vol. 35, No. 18, pp. 2237–2242.
Edwards, C., and S.B. Palmer, 1986, “The Magnetic Leakage Field of Surface-Breaking Cracks,” Journal of Physics D: Applied Physics, Vol. 19, No. 4, pp. 657–673.
Hu, Bin, Gongtian Shen, Luming Li, and Yan Wu, 2008, “Applied Research of Magnetic Memory Method (MMM) on Amusement Devices,” 17th World Conference on Nondestructive Testing (WCNDT 2008), Shanghai, China, pp. 1383–1389.
Sophian, Ali, Gui Yun Tian, and Sofiane Zairi, 2006, “Pulsed Magnetic Flux Leakage Techniques for Crack Detection and Characterization,” Sensors and Actuators A, Vol. 125, pp. 186–191.
Stupakov, O., J. Pal’a, I. Tomáš, J. Bydžovský, and V. Novák, 2007, “Investi-gation of Magnetic Response to Plastic Deformation of Low-Carbon Steel,” Materials Science and Engineering: A, Vol. 462, Nos. 1–2, pp. 351–354.
Wilson, John W., Gui Yun Tian, and Simon Barrans, 2007, “Residual Magnetic Field Sensing for Stress Measurement,” Sensors and Actuators A: Physical, Vol. 135, No. 2, pp. 381–387.
52 Page Views
0 PDF Downloads
0 Facebook Shares