Abstract
Guided wave has already been introduced to a wide variety of nondestructive testing especially for plate and pipe components. The shape of the cross section of the infrastructure is different in every portion, and the components consist of heterogeneous materials such as concrete and reinforced steel bar. Therefore it is useful to know the property of the guided wave in the target material prior to the testing. In this research, we adopted two numerical tools to assist the guided wave testing. One is the semi-analytical finite element method (SAFE), and the other is the elastodynamic finite integration technique (EFIT). The SAFE and EFIT were used to obtain the dispersion curve and the transient wave propagation, respectively. These methods were validated with the experimental measurement using an I-beam metal specimen. In the measurement, we used a wireless experimental system to receive signals of the guided wave. The guided wave was excited with an impact hammer, and then received with wireless accelerometers at multiple points. The simulation results and measurements showed good agreement with respect to the velocity dispersion curve, and the polarization shape in the propagation.
