A semi-analytical scale bridging approach towards polycrystalline ferroelectrics with mutual nonlinear caloric-electromechanical couplings
| Autor: | Andreas Ricoeur, Andreas Warkentin |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Bridging (networking) Applied Mathematics Mechanical Engineering Caloric theory 02 engineering and technology Mechanics Dissipation 021001 nanoscience & nanotechnology Condensed Matter Physics Ferroelectricity Finite element method Nonlinear system 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Modeling and Simulation Representative elementary volume General Materials Science Crystallite 0210 nano-technology |
| Zdroj: | International Journal of Solids and Structures. :286-296 |
| ISSN: | 0020-7683 |
| DOI: | 10.1016/j.ijsolstr.2020.05.016 |
| Popis: | Various caloric aspects of polycrystalline ferroelecrics are investigated, based on an efficient modelling approach. In this context, both linear reversible effects, leading to heating or cooling of the material, and nonlinear dissipation heating, being associated with ferroelectric domain switching, are considered. The semi-analytical approach focusses on the constitutive behavior of a polycrystalline representative volume element (RVE) under the impact of combined electromechanical loadings, incorporating mutual interactions of caloric and electromechanical fields within a framework of non-equilibrium thermodynamics. Temperature dependence of material coefficients is further taken into account. The so-called condensed method (CM) is employed to bridge the scales of domain wall motion within grains and grain interaction in the RVE. Results are compared to those of finite element simulations and experiments taken from literature, illustrating hysteresis loops and dissipation heating due to cyclic electrical loading. Additional findings illuminate the role of mechanical compression during electric cycling, behaviors of single vs. polycrystals, and separate the impacts of linear and nonlinear caloric effects. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect