Transactions of Nanjing University of Aeronautics & Astronautics
Debonding Patch Detection in FRPStrengthened Materials with Fiber Optic Interferometer
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Abstract:
The interfacial debonding in fiberreinforced plastic(FRP) strengthened repair material will affect the bonding strength and lead to failure of the repair without warning. Unfortunately the interfacial damage is normally invisible and often in the form of a patch rather than a throughwidth crack. Therefore, a debonding patch detection technique based on fiber optic interferometry is proposed. A quasiimpulse loading is applied with a rubberhead hammer and the total elongation of a surfacemounted optical fiber along the length of the repair material is measured as a function of load position. When a debonding patch is present, the induced sudden slope or sign change on the plot of fiber integral strain v.s. load position will reveal the extent and the location of the debonded area. The results of the study indicate that the proposed technique is applicable for debonding patch detection in repaired members under various support conditions.
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