Evaluation of interfacial disbonding using finite element-based resonance ultrasonic spectroscopy

Abstract

In this paper, application of resonance scattering theory for nondestructive evaluation of embedded elastic cylindrical targets is investigated. For this purpose, an FE-based short-pulse method of isolation and identification of resonances is used to investigate the effects of cylinder-matrix interfacial disbonding involving the frequency effects of measurement system. Insonification of ultrasonic plane wave from an emitting transducer and the resulting scattered wave field from the embedded cylinder is simulated using commercial software ABAQUS/Explicit. The proposed FE-based method of isolation and identification of resonances is employed to investigate the effects of cylinder-matrix interfacial disbonding on the resonance modes using far-field backscattered frequency spectrum. It is observed that, compared to the whispering gallery resonance modes, the Rayleigh modes have higher sensitivity to the presence of side-wall interfacial disbonding which significantly decreases for back-wall defects.