Abstract
Guided waves are used for both non-destructive-evaluation (NDE) and structural health monitoring (SHM) applications. High-frequency waves excited on certain structures can appear as guided waves. These waves exhibit the phenomenon of dispersion, where a wave-packet consisting of waves with different frequencies will tend to spread out in space. Dispersion curves give information on the wavenumber of individual wave modes for a given frequency-thickness. This information is often determined through numerical solutions, but is possible to determine experimentally. Here, a case study is carried out to separate and reconstruct time-signals of wave modes from dispersion curves using a two-dimensional inverse Fourier transform. In this study, Lamb waves are simulated in a thin plate, and a forward-backwards method of 2D Fourier transforms is then used to separate and reconstruct individual modes. Separating of wave modes can lead to deeper understanding of Lamb wave phenomena, as well as produce potential benefits for NDE/SHM applications.