Abstract
A new immersion resonance hannonic imaging method is applied to visualize plastic deformation in a perforated SUS strip. The sample was extended axially by 30%, thereafter the thickness variation was removed by machining. With long tone-burst waves of a fixed frequency, resonance in thickness direction was excited for the sample laid horizontally in a water bath. The higher order harmonics were extracted with high-pass filters. The amplitude images of higher harmonics clearly show the extent of plastic deformation. The images could cortespond to the dislocation density.
