Numerical computation of ultrasonic attenuation in polycrystalline materials with finite element modeling and grain-scale material description

OUDAA, Massoud; EDF R&D – EDF Lab Les Renardières – Materials and Mechanic of Components department; France

Oudaa, M.; EDF R&D; France
Lhuillier, P.E.; EDF R&D; France
Guy, P.; INSA; France
Leclere, Q.; INSA; France

ID: ECNDT-0458-2018
Download: PDF
Session: Microstructural Scattering - UT 2
Room: J2
Date: 2018-06-13
Time: 11:10 - 11:30

A 3D finite element modeling approach of ultrasonic propagation combined with a description of the microstructure at the scale of the grains has been implemented. The simulations seek to determine the contribution of scattering to the ultrasonic attenuation in polycrystalline materials. The approach is applied into isotropic microstructures. The ultrasonic propagation is computed with the finite element code ATHENA 3D that developed by EDF. The description of the propagation media accounts for the geometric, elastic and crystallographic properties of coarse-grained material. The attenuation was computed from the decay of simulated multiple backwall echoes. The contribution of the microstructure scattering was isolated by a correction of the attenuation data with the attenuation obtained in an equivalent homogenized material. The simulation investigates the variation of attenuation as a function of several key parameters: grain size, grain orientation, probe frequency.