Application of local defect internal resonance method for detection of adhesive interface debonding

Abstract

Abstract The bonding interface is prone to debonding under environmental implication and long-time operational vibrations, which may affect the structural integrity severely. This paper presents an interface debonding identification method to solve adhesive interface debonding between aluminum plates in the framework of the internal resonance of local defects. Firstly, based on a two degree of freedom (2-DOF) nonlinear model of local defects in the bonding interface, the multi-scale method is used to explain the mechanism of the internal resonance of local defects and conditions for the generation of the internal resonance. By analyzing the saturation phenomenon peculiar to the 2:1 internal resonance of local defects in the spectrum, the adhesive interface debonding identification experiment of a bonding aluminum plate is carried out. The effectiveness of the local defect internal resonance method is verified by experimental results and theoretical analysis. The results demonstrate that the bonding structure appears the saturation phenomenon under the specific excitation conditions. Furtherly the local defect internal resonance method is found to be effective in solving adhesive interface debonding detection.