Simulation of Lamb Wave Propagation Using Pure Mode Excitation

A combination of studies of dispersion behavior (wave mode properties) with time domain Finite Element modelling constitutes a very useful approach to developing guided wave NDE techniques. The dispersion curves and the mode shapes reveal a lot of information about how a guided wave will behave in a plate and can be used to judge modes and frequencies that are likely to be sensitive to defects. However, because of their modal nature, the dispersion curves cannot predict how a guided wave will react with a local geometric change in a plate such as a defect, which is of great importance to Lamb wave testing. Finite element modelling can fill in this information