Abstract
The interaction of the SH0, SH1, SH2 and SH3 guided wave modes on a metal plate with a thickness discontinuity is numerically and experimentally investigated. Two different geometries were evaluated, namely symmetric and non-symmetric discontinuities, relative to the plate longitudinal mid-plane. Experiments were performed with periodic permanent magnet array EMATs as transmitters and receivers. Mode separation in transmission and reception was experimentally and numerically performed by dual transduction and by modal decomposition post-processing techniques, respectively. The reflection and transmission coefficients at the discontinuity for each of the investigated SH modes was calculated. It has been experimentally confirmed that when interacting with symmetric discontinuities, only modes that share the same symmetry as the incident mode are created by mode conversion, whereas mode conversion to modes of different symmetry can occur with non-symmetric discontinuities. Experimental and numerical data show good agreement, revealing that the higher the order of the incident mode, the more complex the behaviour of the reflection coefficient is, as a function of the discontinuity depth. For the same incident mode, symmetric discontinuities impose less complexity than non-symmetric ones.
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