Prediction and measurement of the reflection of the fundamental anti-symmetric Lamb wave from cracks and notches

Lowe, M. J. S.; Cawley, P.; Kao, J-Y; Diligent, O.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p193
Academic Journal
The interaction of the fundamental antisymmetric Lamb wave (a[sub o]) with cracks and with notches of different depth and width has been investigated both experimentally and by finite element analysis. Excellent agreement between the predictions and the measurements has been obtained. It has been shown that the reflection coefficient is a function of both the notch width to wavelength and notch depth to wavelength ratios. Both the relationship between the reflection coefficient and notch, depth, and the frequency dependence of the reflection coefficient, are very different for the a[sub o] mode compared to the s[sub o] mode which was studied earlier. Physical insight into the reasons for the different behavior is given by examination of the stress fields and opening displacements at the crack or notch. © 2000 American Institute of Physics.


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