Numerical Modeling of Ultrasonic Guided Waves for Damage Detection in Structures
This work presents a numerical simulation of the behavior of stress guided waves (GWs) propagating in a multilayer system composed of porous materials. To this end, the damped Semi-analytical Finite Element (SFE) formulation proposed in  is extended to take the dry porosity into account. An application of waves propagating in two squared aluminum bars jointed by a weaker layer of porous adhesive is presented. Numerical results show that variations of the adhesive's porosity modify the GWs spectro-temporal patterns. These changes could be exploited to detect the level of adhesive porosity in a total nondestructive manner for the above structures.
M.H Aliabadi, S. Abela, S. Baragetti, M. Guagliano and Han-Seung Lee
E. Viola and A. Marzani, "Numerical Modeling of Ultrasonic Guided Waves for Damage Detection in Structures", Key Engineering Materials, Vols. 417-418, pp. 357-360, 2010