Analysis of stress-magnetic coupling effect in weak magnetic environment |
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| Authors: | QIU Zhong-chao ZHANG Wei-min GUO Yan DUBOV A A |
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| Affiliation: | 1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Energodiagnostika Company, Moscow 143965, Russia |
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| Abstract: | Metal magnetic memory (MMM) signals are difficult to be analyzed due to noise interference, which limits its practical engineering application. A method of improving the magnetic signals is proposed in this paper by placing the excitation device which generates a weak external magnetic field about 100 A/m. The effect of the external magnetic field on the magnetic signals is studied using both finite element method (FEM) and uniaxial tensile tests. Comparison of the test data with the simulation ones of stress-magnetic coupling shows that the magnetic signals are strengthened and the measurement sensitivity of the detection system is greatly improved through the external magnetic excitation. Moreover, the FEM result has a good agreement with the testing results of No.20 steel plate. The proposed method has laid a foundation for further practical engineering application. |
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| Keywords: | stress-magnetic coupling metal magnetic memory stress concentration finite element analysis measurement sensitivity |
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