Debonding Monitoring of Adhesive Repaired Structures Based on the Phase Delay of Ultrasonic Guided Waves
Adhesive repair is one of the primary methods for restoring damaged structures.However,repaired structures may experience debonding damage under various factors,thereby affecting their safe use.In order to effectively identify debonding damage at the adhesive interface of repaired structures,this study proposes a monitoring method based on the variation of ultrasonic guided wave phase delay.Firstly,a multi-frequency fusion probability-weighted distribution damage diagnostic imaging algorithm is employed for comprehensive localization of the debonding damage center.Subsequently,the relationship between the phase delay damage factor and the path debonding length is utilized to determine the debonding edge points for each damaged path.The convex hull curve of these points is outlined for debonding damage contour recognition.The effectiveness of the proposed method in identifying the center and shape of debonding damage is validated through finite element simulation analysis.Experimental verification is conducted on a composite patch repaired aluminum plate structure,confirming the practicality of the method.This research provides a practical means of monitoring for the safety assessment of adhesive repaired structures.
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