15 April 2016 Finite element approach analysis for characteristics of electromagnetic acoustic Lamb wave
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Abstract
The electromagnetic acoustic Lamb wave, with the advantages of quickly detecting the defect and sensitivity to the defects, is widely used in non-destructive testing of thin sheet. In this paper, the directivity of sound field, Phase velocity, group velocity and particle displacement amplitude of Lamb wave are study based on finite element analysis method. The results show that, for 1mm aluminum, when the excitation frequency 0.64MHz, the displacement amplitude of A0 mode is minimum, and the displacement amplitude S0 mode is largest. Appropriate to increase the displacement amplitude of a mode, while reducing displacement amplitude of another mode, to achieve the excitation of a single mode Lamb wave. It is helpful to the Optimization of transducer parameters, the choice of Lamb wave modes and providing optimal excitation frequency.
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Xiaoming Chen, Xiaoming Chen, Songsong Li, Songsong Li, "Finite element approach analysis for characteristics of electromagnetic acoustic Lamb wave", Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 980423 (15 April 2016); doi: 10.1117/12.2219012; https://doi.org/10.1117/12.2219012
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