Abstract
This research is focused on measuring the dispersion behavior of acoustic wedge waves propagating along the tip of circular wedges with a laser-generation/laser-detection laser ultrasound technique. The unexpected measurement results indicate that the dispersion relation of the fundamental antisymmetric flexural (ASF) mode has a negative slope in the phase velocity-frequency dispersion space for a nearly truncation-free circular wedge. It is also observed that, at the low-frequency, or long-wavelength limit, the fundamental ASF mode of the circular wedge has a phase velocity higher than that of a straight wedge due to the curvature effect. However, at the high-frequency, or short-wavelength limit, the fundamental ASF mode of the circular wedge becomes insensitive to the curvature effect and is dominated by the truncation effect.
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