Project P6

Project description

Microstructural interaction and switching in ferroelectrics

The main goal of this project is the multi-scale modelling of rate-dependent microstructure evolution in ferroelectrics. Two different models will be developed on the level of single-crystals and further extended to the level of oligo-crystals. As a general modelling framework, the previously established laminate-based approach will be employed. In particular, this formulation will be extended to include the effect of interfaces. Within the context of mixture theory, the laminate-related volume fractions represent the microstructure in this approach. Alternatively, the ferroelectric microstructure will be modelled with the help of level-set methods. In the context of the finite-element method, this enables the simulation of spatially resolved microstructures. Both the volume-fraction- and level-set-based models will be calibrated using experimental data on single-crystals. Related finite element simulations, which can consider the positions and orientations of individual grains, enable the simulation of oligo-crystals within both modelling frameworks. The level-set approach naturally includes more information than the volume-fraction-based model, since the level-set formulation spatially resolves the microstructure. This is at a higher computational cost, however, so that a comparison of both models contributes to the evaluation of the quality, efficiency and applicability of the laminate-based model. Both models contribute to a better understanding of the local microstructure evolution in technologically meaningful ferroelectrics. This enables an improved prediction of, e.g., lifetime properties of typical ferroelectric actuators and sensors.

Publications

Latest results

Prof. Dr.-Ing. Andreas Menzel
Institute of Mechanics

andreas.menzel@udo.edu
Tel.: +49 231 755 5744/7978
Room: 102

Prof. Dr.rer.nat. Bob Svendsen
Institute of Mechanics

bob.svendsen@rwth-aachen.de
Tel.: +49 241 80 99156
Room: 127

Dinesh Kumar D.K., M.Sc.
Institute of Mechanics

dinesh.dusthakar@udo.edu
Tel.: +49 231 755 5603
Room: 141