The influence of interface layer characteristics on Lamb waves in layered anisotropic media

In this paper, the spring model for the anisotropic interface layer is built and introduced to the global matrix technique that is popularly used for analyzing layered composites. In introducing the spring interface condition, the philosophy adopted is to incorporate it with a minimum disruption to the program structure, particularly the assembly of the global matrix. The spring interface has therefore been introduced as a "material layer". This layer has material constants which govern the stiffness across it and has zero thickness. The layer can be built into the appropriate location in the global matrix without making any changes in the other layers of the system. Numerical computations for the Lamb wave dispersion curves in two-layered anisotropic composite media with different interface conditions including rigid connection, slip connection, and complete disbond are made, and plots of the through-thickness particle displacement distributions of Lamb modes for the rigid bond interface and slip bond interface are compared.