Theoretical analysis on scattering of ultrasonic Lamb waves at impact damage in quasi-isotropic CFRP laminates

Abstract

In this research, we investigate scattering of ultrasonic Lamb waves at impact damage in quasi-isotropic carbon fiber reinforced plastic (CFRP) laminates. Based on the Mindlin-Reissner plate theory, we extended the calculation method in isotropic materials to that in quasi-isotropic materials. The calculation results of angular distribution of scattering amplitude agreed with the simulation results, showing the accuracy of this method. The amplitude of scattering waves achieves resonance peaks when the wavelength is close to the radius of damaged area. The findings will be useful for establishing a scattering-based damage detection method in quasi-isotropic CFRP laminates.