

Author: Mckeon J.C.P. Hinders M.K.
Publisher: Academic Press
ISSN: 0022-460X
Source: Journal of Sound and Vibration, Vol.224, Iss.5, 1999-07, pp. : 843-862
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
Ultrasonic guided waves, Lamb waves, are useful for evaluating the integrity of plate and shell structures common in many applications. Tomographic reconstruction with Lamb waves allows for the accurate reconstruction of the variation of quantities of interest throughout the investigated region, and it presents the data as a quantitative map. The location, shape, and extent of flaws can then be easily extracted from this tomographic image. The scattering of Lamb waves from severe flaws introduces artifacts in such reconstructions, however. In this paper higher order plate theory is used to derive analytical solutions for the scattering of the lowest order symmetric Lamb waves from a circular inclusion, focusing in particular on isolated through holes in plates. Plane wave and point source scattering behavior is explored for holes of different diameters, and a finite-beam solution is constructed by superposition of point source solutions. These results are then used to explain the scattering effects seen in Lamb wave contact scanning tomographic reconstructions.
Related content






High-Frequency Guided Wave Scattering by a Partly Through-Thickness Hole Based on 3D Theory
Chinese Physics Letters, Vol. 32, Iss. 8, 2015-01 ,pp. :

