2D P-SV Wave Scattering by a Crack in a Cladding
Paper in proceedings, 2007
A situation that frequently occurs in the nuclear power industry is that of a thick plate or pipe with an austenitic cladding to reduce or prevent corrosion. A common method to apply the cladding on a ferritic base material is to use a welding process. From an ultrasonic testing point of view this leads to a number of complications. The interface between the cladding and the base material is usually corrugated, which may affect the scattering from the interface substantially. Furthermore, the cladding material is anisotropic with all the complications this may lead to.
In this paper ultrasonic testing of a thick plate with a plane crack in a cladding is modelled analytically for a two-dimensional case. The effects of a corrugated interface and anisotropy are both taken into account. The wave scattering problem is solved by a hypersingular integral equation approach, where an integral equation for the crack opening displacement is derived from integral representations for the displacement fields in the two media. A model for the ultrasonic transmitter and receiver is also included. Some numerical results for the change in signal response due to the presence of the crack are given.