High sensitive evaluation fatigue of plate using high mode Lamb wave

Authors: Wei Lin, Xiu hui Deng, Xu Li

Abstract:
In this study, we investigate the influences of the material fatigue on the phase velocities of the Lamb wave. The propagation characteristics of the Lamb wave are predicted by simulations and measured in the experimen ts. It is found that the velocity shift of the high-order mode Lamb wave is more sensitive to the variations of elastic coefficients than that of the low-order mode. In a LY-12-CZ aluminum plate, the velocity shift of the A3 mode is about 9 times larger than that of the A0 mode. Therefore, it is suggested that the high modes of the Lamb wave could provide good sensitivity in the nondestructive examinations of the material fatigue.

Keywords:
Lamb wave
NDE
Phase velocity
Fatigue

Published in: Applied Acoustics (Volume 74, Issue 8, August  2013)

Publisher: Elsevier

ISSN Information: 0003-682X

High sensitive evaluation fatigue of plate using high mode Lamb wave

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