Berlin 2024 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 32: Developement of Calculation Methods I

MM 32.2: Vortrag

Mittwoch, 20. März 2024, 10:30–10:45, C 243

Simulation of properties of anisotropic porous ceramics based on 3D reconstructed microstructures — •Radu Stefan Stirbu¹, Leontin Padurariu¹, Vlad Alexandru Lukacs¹, Fereshteh Falah Chamasemani², Roland Brunner², and Liliana Mitoseriu¹ — ¹Dielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Alexandru Ioan Cuza University of Iasi, 700506 Iasi, Romania — ²Department Materials Center, Leoben Forschung GmbH, Leoben A-8700, Austria

The functional properties of electroceramics are strongly dependent on their porosity level, as well as on the microstructural characteristics of the existing pores (size, shape, orientation, distribution, connectivity). In the present work, the dielectric, ferroelectric and piezoelectric properties of porous BaTiO3 ceramics with anisotropic porosity are numerically estimated by using Finite Element Models, with realistic geometrical input, based on X-Ray tomography data. By this method, peculiar features as structural defects, cracks, percolated pores can be locally investigated and their role on the material property failure can be better understood. Further, the dielectric, ferroelectric and piezoelectric properties are estimated and compared to the experimental ones. The employed approach provides a bridge from meso- to macroscale in understanding the relationship between the microstructure and material properties.

Keywords: X-ray Tomography; Image processing; Multiscale modeling; Homogenization; COMSOL Multiphysics