Lamb waves and electro‐mechanical impedance based damage detection using a mobile PZT transducer set

HIGHLIGHTSA novel‐joint damage detection algorithm based on Lamb waves and electro‐mechanical impedance methods is developed.A mobile transducer set contains PZT patches is designed.A baseline‐free damage characterizing algorithm is presented. ABSTRACT Lamb waves and electro‐mechanical impedance (EMI) based methods are increasingly used in damage detection owing to their high sensitivity to small structural defects. Lamb wave based methods are effective in detecting damages in a large area and electro‐impedance based methods are suitable for characterizing the identified damage. Based on these two methods, a novel combined damage detection method is presented in this research. To achieve this, first, a mobile transducer set is developed, which can be used for both the Lamb waves and EMI based methods. Then, a baseline‐free damage detection strategy that combines the Lamb waves and EMI methods is presented. Finally, a laboratory‐sized test piece is used to validate the effectiveness of the proposed approach. The results achieved with the application of the presented combined method for characterizing an L‐shape crack in an aluminum plate show better location accuracy and detection efficiency than those obtained by applying only one method.

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