Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20404
Title: Transmission analysis of ultrasonic Lamb mode conversion in a plate with partial-thickness notch
Authors: Xu, K
Ta, D
Su, Z 
Wang, W
Keywords: Group velocity
Mode conversion
Mode energy
Notches
Ultrasonic Lamb waves
Issue Date: 2014
Publisher: Elsevier
Source: Ultrasonics, 2014, v. 54, no. 1, p. 395-401 How to cite?
Journal: Ultrasonics 
Abstract: Mode conversions of Lamb waves can occur upon encountering damage or defect such as a notch, leading to newly-converted modes apart from wave reflection and transmission. In this paper, the transmission of the fundamental Lamb modes symmetrical S0 and anti-symmetrical A0 with anti-symmetrical notches were investigated in steel plates within the relatively short propagation distance. The group velocity and modal energy of the converted modes were analyzed using simulations and experiments. Two-dimensional finite difference time domain (2D-FDTD) method was employed to calculate the scattering field and extract numerical trends for simulation study and experimental confirmation. Both simulations and experiments revealed that the apparent group velocities of the converted modes in the transmitted signals subject to the notch positions. To describe the mode conversion degree and evaluate the notch severity, wave packets of the originally-transmitted modes and newly-converted modes were separated and corresponding mode energy percentages were analyzed at different notch severities. Frequency-sweeping measurements illustrated that the modal energy percentages varied monotonically over the notch-depth increase with a statistically consistency (R = 1.00, P < 0.0004).
URI: http://hdl.handle.net/10397/20404
ISSN: 0041-624X
EISSN: 1874-9968
DOI: 10.1016/j.ultras.2013.07.011
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