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Low-frequency impedance as a function of crack length for PAA and sandblasted wedge test FM-73 specimens.
Low-frequency impedance as a function of crack length for PAA and sandblasted wedge test FM-300 specimens.
Note the different impedance and crack length scales.
Figure 20
In-Situ Sensor to Detect Moisture Intrusion and Degradation of Coatings, Composites, and Adhesive Bonds, G.D. Davis, C.M. Dacres, and L.A. Krebs, DACCO SCI Inc.