Abstract
Due to the complex nature of sandwich structures, damage detection in honeycomb sandwich structures inherently imposes many challenges. In this study, leaky guided wave properties generated by piezoelectric wafer actuators/sensors in honeycomb sandwich structures are first simulated by the finite element method. In the numerical model, the detailed honeycomb core geometry is considered. Differential features due to presence of debonding are determined through an appropriate damage index analysis of the signals at the normal and debonded conditions. The image of the debonding is formed by using a probability analysis of the leaky guided wave at each frequency. The final image of the structure can be fused from multi-frequency leaky guided waves. A new method for multi-debonding detection is proposed. Based on the analysis, information about the debondings in the honeycomb sandwich structures can be quantitatively characterized.
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