Abstract
Adequate mathematical and computational models for damaged interfaces and thin interlayers between two solids are necessary for the non-destructive ultrasonic evaluation of the reliability and safety of bonded structures in service. However, the complexity of real interfaces does not allow to describe their mechanical behaviour precisely. In this paper, the problem of elastic guided wave propagation in a multi-layered structure with thin polymeric plies with possible weakened adhesion is treated uniformly employing effective boundary conditions at sublayer interfaces. While for the pristine structure continuity of the displacements and stresses at the interfaces is assumed, for the damaged interfaces, an approach relying on springlike boundary conditions is used. The effect of the internal layer and damaged interfaces b etween sub-layers on an elastodynamic behaviour of a laminate is analysed. Their influence on the dispersion properties of guided waves propagating in a laminated composite structure is illustrated both theoretically and experimentally.
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