Numerical Time Domain Modeling of the Ultrasonic NDT with Electromagnetic Acoustic and Piezoelectric Transducers

In this paper, the 2-D numerical simulation or two typical ultrasonic NDT situations applying two types of ultrasonic transducers - piezoelectric transducers and EMAT - has been considered. In the numerical modeling the coupling between electromagnetic and elastodynamic filed quantities has been neglected. An approximated elastodynamic model for the coupling between the transducer and the solid in excitation and reception mode has been applied and implemented in the solid in excitation and reception mode has been applied and implemented in the well-established numerical modeling code EFIT. The 2-D numerical results showed for the selected parameters, that the used elastodynamic model leads to realistic results, which have been validated against measurements. In future work, one could include the electromagnetic-elastodynamic coupling between the EMAT and solid material as well as the driving electrical network, which has been already presented for a piezoeletric transducer