Wave Velocity Response Characteristics of Electromagnetic Ultrasonic Lamb Wave of Aluminum Plate under Unidirectional Load
Zhang Chuang1, Li Xuefei1, Liu Suzhen1, Tian Lihong2, Pei Ning3
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China; 2. Tianjin Tianduan Press Company Limited Tianjin 300142 China; 3. Beijing University of Technology Beijing 100124 China
Abstract In view of the fact that Lamb waves decay slowly during propagation, the use of ultrasonic Lamb waves for stress detection of thin metal plates has become a hot research method at home and abroad. In order to understand the relationship between the propagation characteristics of Lamb waves and the stress of thin metal plates, this paper gives the dispersion curve of aluminum plate under different stresses of unidirectional load according to the calculation formula of Lamb wave dispersion in isotropic plate. The propagation of the basic mode and first-order mode of Lamb wave and stress field in the same direction are analyzed. According to the calculation results of the dispersion equation, the Lamb wave A1 mode is more sensitive to speed changes than other modes, and the first-order modal speed closer to the cutoff frequency changes more obviously. The experiment of unidirectional stress load applying to a 6061-aluminum plate with a thickness of 1mm is carried out. Considering the multi-modal characteristics of piezoelectric probe excitation, the electromagnetic ultrasonic transducer is used to excite single-mode Lamb wave. Compared with the phase velocity change rates of the basic mode and the first-order mode, the wave velocity of the A1 mode changes obviously, and the experimental results are consistent with the simulation data, which can provide an important basis for the subsequent stress detection of thin metal plates.
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2021, Vol. 36 
