Affiliation:
1. 1 Gdańsk University of Technology , Poland
2. 2 Universidade de Lisboa , Portugal
Abstract
Abstract
Ships and offshore structures operate in a severe corrosion degradation environment and face difficulty in providing long-lasting corrosion protection. The Classification Societies recommend regular thickness measurements leading to structural component replacements, to ensure structural integrity during service life. The measurements are usually performed using ultrasonic thickness gauges and such an approach requires multiple measurements of the corroded structural components. Otherwise, the collected data are insufficient to precisely assess the corrosion degradation level. This study aims to perform numerical and experimental analyses to verify the use of guided ultrasonic waves in defining the corrosion degradation level of the corroded structural components of a ship. The study incorporates the fundamental antisymmetric Lamb mode, excited by piezoelectric transducers attached at the pre-selected points on stiffened panels, representing typical structural ship components. The specimens are exposed to accelerated marine corrosion degradation, the influence of the degree of degradation on the wave time of flight being analysed. The study indicates that guided waves are a promising approach for diagnosing corroded structural components. The signals characterised by a high signal-to-noise ratio have been captured, even for relatively long distances between the transducers. This proves that the proposed approach can be suitable for monitoring more extensive areas of ship structures by employing a single measurement.
Subject
Mechanical Engineering,Ocean Engineering
Reference20 articles.
1. DNV GL, CLASS GUIDELINE Ultrasonic thickness measurements of ships, 2016. [Online]. Available: http://www.dnvgl.com.
2. ACS, “IACS UR Z7,” UR Z7 Hull classification surveys, 2020.
3. K. Woloszyk, Y. Garbatov, and J. Kowalski, “Indoor accelerated controlled corrosion degradation test of small and large-scale specimens,” Ocean Engineering, vol. 241, p. 110039, Dec. 2021, doi: 10.1016/j.oceaneng.2021.110039.
4. B. Zima and R. Kędra, “Debonding Size Estimation in Reinforced Concrete Beams Using Guided Wave-Based Method,” Sensors, vol. 20, no. 2, p. 389, Jan. 2020, doi: 10.3390/s20020389.
5. B. Zima and M. Rucka, “Guided waves for monitoring of plate structures with linear cracks of variable length,” Archives of Civil and Mechanical Engineering, vol. 16, no. 3, pp. 387–396, May 2016, doi: 10.1016/j.acme.2016.01.001.