Use of Fourier-based frequency-wavenumber domain filtering of simulated elastic waves for damage detection in fiber/polymer composites

This study investigates the 3D propagation of elastic waves in a multi-layer carbon fiber reinforced polymer (CFRP) composite plate using finite element analysis (FEA) in COMSOL. Elastic wave propagation is analyzed using Fourier-based frequency-wavenumber domain filtering. Wavefields are usually a component of the velocity or displacement at the top surface of the composite, and they contain detailed information about the guided waves. Reflections from edges and wave scattering from defects can be readily identified. Applying Fourier-based techniques to the wavefields and probe time signals can reveal the state of the composite, making it possible to distinguish between a pristine composite laminate and a composite laminate with defects. 2D and 3D Fourier-based frequency-wavenumber domain filtering can separate the wave into different modes, using which the delamination zones can be located. All COMSOL models are open access (see Appendix A) to support further study on the topic.