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| Effect of Static Bias Magnetic Field on Electromagnetic Ultrasonic Transducer Mechanism in Ferromagnetic Materials |
| Liu Suzhen1, Wu Yunhai1, Zhang Chuang1, Jin Liang2, Yang Qingxin1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China |
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Abstract The electromagnetic acoustic transduction mechanism of the Ferromagnetic material is complicated because of its magnetostrictive effect and nonlinear magnetization characteristic. It is helpful to improve the transduction efficiency and signal-to-noise ratio of electromagnetic acoustic transducer (EMAT) that analyzing the dominant factors of electromagnetic ultrasonic transducing mechanism in ferromagnetic materials under different magnetic field strength. In this paper, the simulation model of Lamb wave EMAT for ferromagnetic material was established. With the change of external magnetic field, the variation laws of Lorentz force, magnetostrictive force and magnetizing force were studied. The main factors influencing the transduction mechanism were analyzed by comparing the displacements under the Lorentz force, the magnetostrictive force and composition of the Lorentz force and the magnetostrictive force. The experimental results show that the displacement and velocity of Lamb wave are consistent with the simulation results. The study proves that: The magnetostrictive effect plays a dominant role in the field of weak magnetic, the Lorentz force increases and plays a major role when the ferromagnetic material is near magnetic saturation, the strain caused by the magnetostrictive effect is very small and barely changes at the magnetic saturation stage.
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Received: 01 April 2017
Published: 08 May 2018
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2018, Vol. 33 
