Laser ultrasound measurement and finite-element simulation on the dispersion behaviors of acoustic waves propagating along wedges with bilinear cross sections

Author

Che-Hua Yang ; Chun-Zen Tsen

Author_Institution

Dept. of Mech. Eng., Chang Gung Univ., Taoyuan, Taiwan

Volume

53

Issue

4

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

754

Lastpage

760

Abstract

In this research, dispersion behaviors of anti-symmetric flexural (ASF) modes propagating along the tip of a bilinear wedge (BW) are investigated. A BW has a cross section with two apex angles, as opposed to a linear wedge (LW) whose cross section has a single apex angle. In the literature, many studies regarding the dispersion behaviors of ASF modes have been reported for LWs, but not for BWs. In this study, laser ultrasonic measurements and finite-element numerical simulations are used to investigate the dispersion behavior of BW-ASF modes. It was found that a BW-ASF mode arises as a result of mode coupling between two LW-ASF modes of the same order corresponding to the two apex angles of the BW.

Keywords

acoustic dispersion; acoustic wave propagation; elastic waves; finite element analysis; measurement by laser beam; ultrasonic measurement; acoustic wave propagation; antisymmetric flexural modes; apex angles; bilinear cross sections; bilinear wedge; dispersion behaviors; finite-element simulation; laser ultrasound measurement; mode coupling; Acoustic measurements; Acoustic propagation; Acoustic waves; Dispersion; Finite element methods; Laser modes; Numerical simulation; Optical propagation; Ultrasonic imaging; Ultrasonic variables measurement;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2006.1621502

Filename

1621502