Condition Assessment of Cylindrical Structures Using Helical Guided Ultrasonic Waves

This work is concerned with the acoustic emission of helical guided waves generated during corrosion in cylindrical steel structures. The energy that is emitted during the corrosion progress in the steel is collected by means of acoustic emission hits and a correlation is established between the amplitude of these hits and the corrosion through a b-value analysis. The methodology was validated through an accelerated corrosion experiment, and a linear relationship between the b-value and the corrosion evolution was observed.