Recently, a growing interest in application of non-destructive techniques (NDT) for evaluation of repair efficiency is noted. For this purpose, stress wave based methods, e.g. impact echo, ultrasonic methods are commonly recommended. As a result of repair, a system containing two or more layers is created. Propagation of stress waves in this kind of system is complex phenomenon and depends on acoustic properties of repair material and its thickness as well as a quality of interface.

In this work finite element (FE) method was used to simulate stress wave propagation for various models of repair system. Ls-Dyna, an explicit finite element program dedicated for transient dynamics was applied. Several cases of impact-echo test with different parameters of layer system were analysed. Among considered model parameters were acoustic properties, boundary conditions, layer thickness of repair material and presence of delamination at the interface. Computer simulations of the stress wave propagation showed good correlation with the impact-echo principle. The effect of repair system parameters on wave propagation was discussed.

The research project was granted by Polish Scientific Research Committee - grant number KBN 4 T07E 027 27 (2004-2006).

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