Debonding damage recognition of bonding interface based on local internal resonance of defects

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (13) : 1-9.

LI Zhihang, XIAO Li, QU Wenzhong

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Abstract

The interface debonding of bonded structures will lead to the destruction of structural integrity, so it is of great significance to effectively detect and evaluate the interface debonding. In this paper, a debonding recognition method for bonding interface based on internal resonance of local defect is proposed. Based on a two degree of freedom (2-DOF) nonlinear model of local defects in the bonding interface, the mechanism of the local internal resonance of the interface debonding defects was analyzed by using the multi-scale method, and the specific excitation conditions were determined for the identification method of the internal resonance damage. Experiments were performed on a bonding aluminum beam. Two surface-bonded piezoelectric transducers were used to generate continuous sinusoidal excitation, and receive corresponding wave signals, and the spectral analysis of the response signals was conducted. The adhesive interface debonding identification was carried out by analyzing the saturation phenomenon the two-to-one internal resonance of local defects in the spectrum. The results of numerical simulation and experiment demonstrated that the internal resonance would appear when bonding structure was subject to specific excitation conditions. The internal resonance of local defect can amplify the nonlinear characteristics of the defect, improve the signal-to-noise ratio, gain the detection ability under noise, and effectively identify the debonding damage of the bonding interface.

Key words

Interface debonding / Damage detection / Internal resonance of local defects / Multi-scale method / Saturated phenomena

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LI Zhihang, XIAO Li, QU Wenzhong. Debonding damage recognition of bonding interface based on local internal resonance of defects[J]. Journal of Vibration and Shock, 2023, 42(13): 1-9

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