Numerical modelling of ultrasonic guided wave propagation and defect detection in offshore steel sheet piles

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Abstract

Sheet piles are significantly more prone to advanced corrosion rates due to accelerated low water corrosion. Current inspection and assessment techniques are costly, time-consuming and labour-intensive. Guided wave testing (GWT) has gained increased attention due to its capability of screening long distances; however, it has not been used previously to inspect the active zone in steel sheet piles. This paper focuses on the numerical modelling of wave propagation and defect detection in U-shaped piles to demonstrate the capabilities of GWT for the inspection of non-accessible areas of steel sheet piles. Two shear transducer arrays were designed, bearing high SH0 mode purity and directionality. A wave propagation comparison study concluded that the back wall reflection signal from the web of a U-pile was 11.5% higher than the respective signal from the plate, and the excitation signal in the flange, at 5.65 m and 7.12 m, was respectively 35% and 46% less than the excitation signal in the web at the same distance. Defect reflection, measured from five representative defect scenarios, ranged from 7.5 to 47% of the signal amplitude in the web of the pile and 5 to 32.5% in the flange of the pile.

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APA

Dhutti, A., Dhutti, A., Malo, S., Marques, H., Balachandran, W., & Gan, T. H. (2021). Numerical modelling of ultrasonic guided wave propagation and defect detection in offshore steel sheet piles. Applied Sciences (Switzerland), 11(9). https://doi.org/10.3390/app11094076

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