24 October 2017 Observation of the dispersion of wedge waves propagating along cylinder wedge with different truncations by laser ultrasound technique
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Proceedings Volume 10457, AOPC 2017: Laser Components, Systems, and Applications; 104570T (2017) https://doi.org/10.1117/12.2283219
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
The research focuses on study the influence of truncations on the dispersion of wedge waves propagating along cylinder wedge with different truncations by using the laser ultrasound technique. The wedge waveguide models with different truncations were built by using finite element method (FEM). The dispersion curves were obtained by using 2D Fourier transformation method. Multiple mode wedge waves were observed, which was well agreed with the results estimated from Lagasse’s empirical formula. We established cylinder wedge with radius of 3mm, 20° and 60°angle, with 0μm, 5μm, 10μm, 20μm, 30μm, 40μm, and 50μm truncations, respectively. It was found that non-ideal wedge tip caused abnormal dispersion of the mode of cylinder wedge, the modes of 20° cylinder wedge presents the characteristics of guide waves which propagating along hollow cylinder as the truncation increasing. Meanwhile, the modes of 60° cylinder wedge with truncations appears the characteristics of guide waves propagating along hollow cylinder, and its mode are observed clearly. The study can be used to evaluate and detect wedge structure.
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Jing Jia, Yu Zhang, Qingbang Han, Xueping Jing, "Observation of the dispersion of wedge waves propagating along cylinder wedge with different truncations by laser ultrasound technique", Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104570T (24 October 2017); doi: 10.1117/12.2283219; https://doi.org/10.1117/12.2283219
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