Modelling of Ultrasonic Scattering in Polycrystals Aiming for Tools to Simulate Experiments in NDT&E

Abstract

Numerical simulations of ultrasonic propagation and nondestructive testing and materials characterization proceduresmust comprise microstructural scattering phenomena. This objective requires a convenient microstructural scatteringmodel allowing the simulation of ultrasonic time signals, e.g. backscattering signals (A-scans), flexibility in shape and macroscopic material inhomogeneity (local microstructure variations, defects, etc.) of the considered component, and the evaluation of analytical scattering coefficient formulae ensuring fast simulation algorithms.A general theoretical approach delivers the analytical basis. A 3D model for the numerical realization of proper statistical grain distributions for single-phase macroscopically isotropic polycrystals is developed, and ultrasonic backscattering signals are numerically simulated using the analytical scattering coefficient formulae provided by the theory