RESULTS OF THE 2010 UT MODELING BENCHMARK OBTAINED WITH CIVA: RESPONSES OF BACKWALL AND SURFACE BREAKING NOTCHES

This communication presents the results obtained on the configurations proposed in the 2010 UT modelling benchmark with the ultrasonic models implemented in the CIVA software. Experiments have been performed upon a planar block containing vertical planar backwall and surface breaking notches of different heights and extensions. The aim is to study the relative amplitudes of the notches echoes obtained after one bound on the backwall or after two bounds, on the backwall and then on the surface of the block. Side drilled holes and flat bottom holes were also present in the block for calibration. Two immersion probes of 5 MHz central frequency, for two different apertures, were used. The echoes are simulated by applying an integral formulation for the field radiated by the probe (the pencil‐model) and a scattering model based on the Kirchhoff approximation. Comparison between simulated and experimental results are presented and discussed.