2D Finite Element Modelling of Wave Propagation Through Simplified Obstacle

The guided wave structural monitoring system is one of the methods for non-destructive testing (NDT) that can be tested on any components without removing it or even stop the operation. Lamb wave is used to detect defects and reflects the echoes on the structure’s surface. As the Lamb wave is still being developed, the use of Lamb wave propagation through thin plate to detect the defects is still not widely used in industry. For unprofessional NDT operator, they might miss out the defects during structural analysis. Therefore, this study is to investigate the characteristics of the wave when the wave interacts with different types of corrosion defect on thin plate such as pitting corrosion (narrow and deep, subsurface, undercutting), erosion corrosion and fatigue corrosion. The main objective of the analysis is to model wave propagation through thin plate with and without corrosion defect by using Abaqus and analyze wave signal by using various types of software. MATLAB was used to produce Gaussian-modulated cosine wave. Next, Abaqus was used to simulate the thin plate with corrosion defect for finite element analysis. After the simulation was done using Abaqus, wave signal analysis needs to be carried out in MATLAB in order to analyze the wave signal output generated by Abaqus. To prove that the simulation is valid and accurate, the theoretical initial and end time arrival of wave was compared with the simulated result. © 2023, The Institution of Engineers (India).