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Communication Dans Un Congrès Année : 2021

Grain-scale full-field FE modeling of ultrasonic scattering in polycrystalline materials

Résumé

The success of ultrasonic non-destructive testing of polycrystalline materials inevitably depends on mastering the correlation between the polycrystalline microstructure and ultrasonic grain scattering. Waves interacting on their propagation path with the impedance discontinuities due to the grain structure are strongly disturbed. A good understanding and correct modeling of their behaviors according to the crystallographic and morphological characteristics of the microstructure is certainly difficult but is of practical importance both for the detection of defects and for the microstructure characterization. Compared to experimental testing and theoretical modeling, it is now widely accepted that numerical modeling is a powerful complementary but essential tool for accessing polycrystalline microstructures and improving the understanding of their interactions with ultrasonic waves. More specifically, grain-scale full-field finite element modeling has demonstrated its ability, on the one hand, to master the microstructural data to be studied, and on the other hand, to fully grasp the multiple scattering phenomena and get rid of restrictive assumptions of low order scattering made in some theoretical models. This contribution presents some recent modeling and simulation results obtained using a grain-scale full-field FE solver based on the space discontinuous Galerkin method. Both coherent waves and structural noise are analyzed through quantities as phase velocity, attenuation coefficient, and scattering coefficient. Among the microstructural characteristics, the grain size distribution is mainly investigated here. Comparisons with explicit analytical models are made. Especially in the case of more realistic microstructures for which no explicit analytical model is no longer available, the numerical “experiments” are carried out to discuss, confirm or invalidate theoretical hypotheses. Both 2D and 3D cases are studied, and the dimensionality of the grain scattering phenomena is also analysed.
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Dates et versions

hal-04534601 , version 1 (05-04-2024)

Identifiants

  • HAL Id : hal-04534601 , version 1

Citer

Bing Tie. Grain-scale full-field FE modeling of ultrasonic scattering in polycrystalline materials. 16th International Symposium on Nondestructive Characterization of Materials, Aug 2021, Baltimore, MD, USA, United States. ⟨hal-04534601⟩
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