Interaction of lamb waves with an imperfect joint of plates: Reflection, transmission and resonance

Abstract

The interaction of Lamb waves with an imperfect joint of plates modeled as a linear spring-type interface is analyzed by the elastodynamic finite integration technique (EFIT). For the incidence of the lowest-order symmetric (S0) mode in a low frequency range, the S0-mode transmission coefficient decreases monotonically with the frequency. Furthermore, the imperfect joint exhibits long-time oscillation at certain frequencies depending on the joint stiffnesses when subjected to the S0-mode incidence. These frequencies are in good agreement with the resonance frequencies obtained by the frequency-domain analysis.