Abstract
The relation between guided wave group velocities and stresses is the key to stress evaluation for slender waveguides. In this study, an investigation of the nonlinear relation between guided wave group velocity and stress was carried out numerically and experimentally, and a stress measurement method based on the nonlinear relation was developed. The group velocity variation-frequency curve was numerically determined. The group velocity and stress are positively correlated in a particular frequency range and the fitted curves show high fitting rates with the quadratic curves. Besides, a numerical method for selecting the most sensitive excitation frequency was given. Loading tests and ultrasonic tests were conducted on four groups of steel slender specimens to obtain the acoustoelastic calibration curve of each specimen. The reliability of the calibration curves was verified and the results show the proposed method has high accuracy in the larger stress levels.
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