Reflection and scattering of the S[sub 0] Lamb mode from 3-D circular defects in plates.

A second study of the interaction of Lamb waves with a circular defect is presented. The Lamb wave mode chosen was the So mode in the low frequency-thickness regime. A three dimensional Finite Element mesh was generated, representing an area of the plate with a circular part-depth hole (33% or 50% of the plate thickness deep). The specular reflection of an incident So wave was predicted and showed the importance of several factors, such as the decay in amplitude of the reflected wave and the generation of "creeping waves" which travel around the hole. [ABSTRACT FROM AUTHOR]