Crack detection of fibre reinforced composite beams based on continuous wavelet transform

This paper presents a crack detection method for fibre reinforced composite beams based on the continuous wavelet transform. Finite element method simulations and experiments were carried out for flawed cantilever composite beams subjected to impact load at their free ends. The Gabor and Morlet wavelets were chosen for wave signal processing owing to their good time-frequency characteristics. Both wavelets perform well in the crack detection of composite beams. The results show that the crack location can be determined successfully, and the crack depth can be estimated from the crack-reflection ratio. Moreover, the Gabor wavelet can locate the cracks more accurately by virtue of its higher time resolution.