Guided Wave Propagation For Inspection Of Residual Thickness Over Defects

Muhammad, Nor Salim and Jenal, Ruztamreen and Ismail, Mohamad Pauzi and Hamzah, Khaidzir (2018) Guided Wave Propagation For Inspection Of Residual Thickness Over Defects. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Guided wave technique in non-destructive inspection already been applied in several petrochemical industries for corrosion and crack detections of mechanical structures which can cause mechanical failures during operations. However, the behaviour of guided wave is very complicated due to its multimodal vibrations and dispersive characteristics which do not allow for in-situ and immediate characterization of residual thickness. In addition, there are fewer studies carried on thickness measurement using the guided wave technique compared to the defect location. Detail studies are importance to explain the remaining thickness over defects for the maintenance of the structures. The work utilize a model of wave propagation in solid media (3D-FEA) to investigate relationship between thickness losses on structures and behaviour or wave propagation. The simulation use to analyze guided wave propagation in the vicinity of defects with varying depths, sizes, and orientations to achieve objectives which are to investigate if there are mode conversions occur at corrosion defects and obtain the correlation between defect depths and amplitudes of the propagation wave for measurement of remaining thickness around defects in structures. The modelling of the acoustic wave propagation in an aluminium at different defect depths is aimed to achieve objective on studying the behaviour of wave mode propagations in plate structures with the presence of corrosion defects. The results explain the behavior of on guided wave propagation over defects when the depth increased through analysis on the transmitted and reflected waves. The reflected wave showed higher amplitude for deep defects that placed perpendicular to the direction of the wave propagation. The induced S0 mode was also observed to have mode conversion into A0 mode around the grooved defects. The reflection from sides of the plate also need to be considered in actual inspection. This indicated complex wave propagation in guided wave technique.

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