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9 March 2014Monitoring of corrosion damage using high-frequency guided ultrasonic waves
Due to adverse environmental conditions corrosion can develop during the life cycle of industrial structures, e.g.,
offshore oil platforms, ships, and desalination plants. Both pitting corrosion and generalized corrosion leading to wall
thickness loss can cause the degradation of the integrity and load bearing capacity of the structure. Structural health
monitoring of corrosion damage in difficult to access areas can in principle be achieved using high frequency guided
waves propagating along the structure from accessible areas. Using standard ultrasonic transducers with single sided
access to the structure, high frequency guided wave modes were generated that penetrate through the complete thickness
of the structure. Wall thickness reduction was induced using accelerated corrosion in a salt water bath. The corrosion
damage was monitored based on the effect on the wave propagation and interference of the different modes. The change
in the wave interference was quantified based on an analysis in the frequency domain (Fourier transform) and was found
to match well with theoretical predictions for the wall thickness loss. High frequency guided waves have the potential
for corrosion damage monitoring at critical and difficult to access locations from a stand-off distance.
D. Chew andP. Fromme
"Monitoring of corrosion damage using high-frequency guided ultrasonic waves", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 90642F (9 March 2014); https://doi.org/10.1117/12.2046301
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D. Chew, P. Fromme, "Monitoring of corrosion damage using high-frequency guided ultrasonic waves," Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 90642F (9 March 2014); https://doi.org/10.1117/12.2046301