Stress Evaluation Using Ultrasonic Interference Spectrum of Leaky Lamb Waves |
| |
Authors: | Z H Zhu M A Post P C Xu |
| |
Institution: | (1) Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada;(2) Datatrends Research Corp., 3-1905 Broad Hollow Gate, Mississauga, ON, L5L 5X2, Canada |
| |
Abstract: | This paper presents a nondestructive stress evaluation technique using the ultrasonic interference spectrum of leaky Lamb
waves. By using a specific pitch-catch ultrasonic setup, the symmetric and antisymmetric modes of Lamb waves in a finite plate
are decoupled, leading to simple relationships between the modal frequency spacing of two adjacent modes in the interference
spectrum and the acoustic wave velocities that are functions of stress. As a result, the stress in the plate can be determined
by measuring the modal frequency spacing instead of the relative flight times to calculate the acoustic wave velocity. Extensive
experiments were carried out to verify the viability and robustness of the new technique using a simple testing system. It
has been demonstrated that the new technique is about 25 times more accurate than existing flight-time approaches using the
same testing system. The experimental results agree well with the results obtained by other ultrasonic methods using expensive
equipment. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|