Guided wave propagation in plate having trussed structures

• Main Author: Lee, Boon Shing
• Format: Thesis
• Language: English
• Published: 2013
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://eprints.utm.my/78172/1/LeeBoonShingMFKM20131.pdf

Guided wave method is one of the methods in Non-Destructive Testing (NDT) for crack detection. The Lamb wave is the common guided wave that is used for NDT. In this RESEARCH, the determination of the dispersion curves of plate having trussed structures could help to reduce the computational time for simulating solid plate. Hence, here the connections of the solid plate to the plate having trussed structures are studied and the possibilities of simplification of the solid plate using the plate having trussed structures are looked into. The Finite Element Method (FEM) is used to simulate the structures proposed and by using Matlab, the space time domain displacement data are transformed into wave number-frequency domain, which is the dispersion curve, by using 2-Dimensional Fast Fourier Transform (2D FFT). The finite element software package used is ABAQUS. The results obtained are compared to the analytical solution of an isotropic plate. It is found that the geometries that could best approximated an isotropic plate is the cross geometry. However, only the anti-symmetric mode curves for the cross geometry has a good correlation with the analytical solution. By simplifying the solid plate as plate having trussed structures, the simulation time can be reduced.