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The present work investigates wave propagation through a damaged interface between
two elastic media. Dynamic behaviour of the deterioration or damage of an interface is described
using a random distribution of strip-like micro-cracks of different sizes, a periodic array of striplike
cracks or via a distributed spring model. The wave-field scattered by cracks is calculated
using a boundary integral equation method. The spring model assumes introduction of the spring
boundary conditions, where stresses are proportional to the displacement jump with the
proportionality given by the spring stiffness. Components of the spring stiffness matrix are
defined in terms of the concentration of the defects, their typical size and the elastic properties of
the contacting materials. Numerical analysis of reflection and transmission for the considered
models of the damaged interface is provided.
Keywords: imperfect contact; crack; interface; spring model; elastic wave; periodic array; random distritution. |
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