Ch. Yang et Js. Liaw, Observation of dispersion behavior of acoustic wedge waves propagating along the tip of a circular wedge with laser ultrasonics, JPN J A P 1, 39(5A), 2000, pp. 2741-2743
This research is focused on measuring the dispersion behavior of acoustic w
edge waves propagating along the tip of circular wedges with a laser-genera
tion/laser-detection laser ultrasound technique. The unexpected measurement
results indicate that the dispersion relation of the fundamental antisymme
tric flexural (ASF) mode has a negative slope in the phase velocity-frequen
cy dispersion space for a nearly truncation-free circular wedge. It is also
observed that, at the low-frequency, or long-wavelength limit, the fundame
ntal ASF mode of the circular wedge has a phase velocity higher than that o
f a straight wedge due to the curvature effect. However, at the high-freque
ncy, or short-wavelength limit, the fundamental ASF mode of the circular we
dge becomes insensitive to the curvature effect and is dominated by the tru
ncation effect.