Structural Health Monitoring of Bonded Patch Repaired Composite

Abstract:

Bonded repair of composite structures still remains a crucial concern for the airworthiness authorities because of the uncertainty about the repair quality. This works, investigates the applicability of Structural Health Monitoring (SHM) techniques for monitoring of bonded repair. Active sensing method has been applied to two case studies: a sensorised panel impacted to cause barely visible impact damage (BVID) and repaired afterwards, the tensile and fatigue testing of a composite strap repair. In the first case, the previous sensors have been used to detect an artificially introduced damage. In the second case the failure of the adhesive during the tensile testing is used as basis of the load levels in the tensile-tensile fatigue test. In both cases PZT transducers have been used to monitor the bonded patch. An electromechanical impedance (EMI) and Lamb wave analysis have been carried out to check the overall integrity of the repair patch between. In both cases the state of the repaired composite was monitored successfully and reported.

• Periodical: Key Engineering Materials (Volume 713)
• Pages: 135-138
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.713.135
• Online since: September 2016
• Authors: Florian Lambinet*, Zahra Sharif Khodaei, M.H. Aliabadi
• Keywords: Active Sensing, Bonded Repair, Composite, PZT Transducer, SHM

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