Research on Damage Imaging Based on Omnidirectional SH_0 Mode Magnetostrictive Patch Transducers Array in Aluminum Plates

During the process of production, transportation and application, plates can easily appear damages which influence the performance of plates and cause potential safety hazard. Transducer array imaging technique lays the foundation for damage visualization. Damage information can be displayed through transducer array imaging technology intuitively and clearly. SH_0 mode spreads in the aluminum plate with the characteristics of non-dispersion and constant velocity. The impact of dispersion cannot be considered during the signal processing which is helpful to damage location and imaging. A kind of magnetostrictive patch transducer based on the magnetostriction mechanism is made for generating and receiving the lowest mode of SH waves, i.e., SH_0 mode, in plates. Furthermore, the omnidirectivity of magnetostrictive patch transducer is tested. Aluminum plates which are popular in engineering applications are taken as research objects. Omnidirectional SH_0 mode magnetostrictive patch transducers are arranged as dis