PISC-III ACTION-6 ON ULTRASONIC MODELING - CONTRIBUTIONS AND PERSPECTIVE FROM 2 UK PARTICIPATING COMPANIES

Action 6 of PISC III is concerned with the mathematical modelling of u ltrasonic inspection. Much of the work has been concerned with the val idation of models, undertaken by comparing their predictions against c arefully controlled experiments carried out on the PISC II Parametric Studies blocks. A report on three models,from Nuclear Electric (former ly part of the CEGB), AEA Technology and the University of Kassel (Ger many), written by staff at the Ispra Joint Research Centre, has recent ly been issued. Three more models, from CEA, EdF and Rolls-Royce and A ssociates, are currently being considered. Work is progressing in two other areas: modelling of defects very close to the scanning surface, and diffraction calculations for various slot tips and other vertices. Work is also planned on the modelling of austenitic materials, with t he aim of offering insight into some of the phenomena observed in PISC III Action 3 on Dissimilar Metal Welds. This paper presents an overvi ew Action 6 but emphasises the contributions of the authors' companies .