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High-Frequency Guided Ultrasonic Waves to Monitor Corrosion Thickness Loss

Fromme, P; Bernhard, F; Masserey, B; (2017) High-Frequency Guided Ultrasonic Waves to Monitor Corrosion Thickness Loss. In: (Proceedings) 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE). AIP Publishing Green open access

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Abstract

Corrosion due to adverse environmental conditions can occur for a range of industrial structures, e.g., ships and offshore oil platforms. Pitting corrosion and generalized corrosion can lead to the reduction of the strength and thus degradation of the structural integrity. The nondestructive detection and monitoring of corrosion damage in difficult to access areas can be achieved using high frequency guided ultrasonic waves propagating along the structure. Using standard ultrasonic transducers with single sided access to the structure, the two fundamental Lamb wave modes were selectively generated simultaneously, penetrating through the complete thickness of the structure. The wave propagation and interference of the guided wave modes depends on the thickness of the structure. Numerical simulations were performed using a 2D Finite Difference Method (FDM) algorithm in order to visualize the guided wave propagation and energy transfer across the plate thickness. Laboratory experiments were conducted and the wall thickness reduced initially uniformly by milling of the steel structure. Further measurements were conducted using accelerated corrosion in salt water. From the measured signal change due to the wave mode interference, the wall thickness reduction was monitored and good agreement with theoretical predictions was achieved. Corrosion can lead to non-uniform thickness reduction and the influence of this on the propagation of the high frequency guided ultrasonic waves was investigated. The wave propagation in a steel specimen with varying thickness was measured experimentally and the influence on the wave propagation characteristics quantified.

Type: Proceedings paper
Title: High-Frequency Guided Ultrasonic Waves to Monitor Corrosion Thickness Loss
Event: 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE)
Location: Atlanta, GA
Dates: 17 July 2016 - 22 July 2016
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4974574
Publisher version: https://doi.org/10.1063/1.4974574
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, PROPAGATION, SCATTERING, DEFECTS, PLATE, ARRAY, CRACK
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10046480
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