Mode conversion of SH guided waves with symmetry inversion in plates

When shear horizontal ultrasonic guided waves interact with thickness discontinuities in plates, the reflected and transmitted wavefields can be composed of several modes due to mode conversion. It is known that a plate symmetric discontinuity, respect plate’s mid-plane, conversion restricted share same symmetry as incident mode. In this paper, we use an analytical model based on reciprocity principle finite element analysis investigate interaction different types namely, non-symmetric, geometrically but opposite boundary conditions, one side discontinuity free other rigidly fixed. We show field latter virtually one, acting inverter discontinuity. Unlike fully discontinuities, effectiveness depends frequency. This was proved aid for full-depth verified partial depth discontinuities. Finally, inversion SH experimentally acrylic plates which were symmetrically machined filled steel mimic fixed condition.