Abstract
Wave scattering analysis implemented by Boundary Element Methods and a normal mode expansion technique was used to study the sizing potential of defects in a wave-guide. Surface breaking defects of three shapes and though wall depths of 10% to 90% on a 10 mm thick steel plate were considered. Mode conversion and reflection and transmission coefficients of both Lamb and Shear Horizontal (SH) waves over a frequency range 0.05 to 2 MHz were calculated. Numerical results showed for the S0 model Lamb wave and n0 mode SH wave at low frequency, a monotonic increase or decrease in signal amplitude with the defect through wall depth. Experiments with Electro-Magnetic Acoustic Transducers (EMAT) are also discussed.
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