DESIGN OPTIMIZATION OF A FERROELECTRIC NANO-ACTUATOR USING PHASE-FIELD MODELING

2014 ◽  
Vol 1674 ◽  
Author(s):  
Ananya Renuka Balakrishna ◽  
John E. Huber
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Two Dimensional ◽  
Phase Field Modeling ◽  
Ferroelectric Crystal ◽  
Surface Conditions ◽  
Field Modeling ◽  
Working Principle ◽  
Ferroelectric Switching

ABSTRACTA ferroelectric crystal with charge-free surface conditions contains polarized domains which can form a flux closure with zero net polarization. In the presence of an external electric field, the flux closure in a two-dimensional continuum reorients its spontaneous polarization to align with the field. Based on this concept of ferroelectric switching coupled with mechanical straining, we demonstrate the working principle of a ferroelectric nano-actuator. The behavior of the actuator is explored under the action of electro-mechanical loading and its mechanism is simulated with a 2D phase-field model. The design of nano-actuator is modified to achieve greater actuation displacements by bending a thin device.

Phase-field modeling of the coupled domain structure and dielectric breakdown evolution in a ferroelectric single crystal

2019 ◽  
Vol 21 (29) ◽  
pp. 16207-16212 ◽  
Author(s):  
Ziming Cai ◽  
Chaoqiong Zhu ◽  
Xiaohui Wang ◽  
Longtu Li
Keyword(s):  
Single Crystal ◽  
Domain Structure ◽  
Phase Field ◽  
Field Model ◽  
Dielectric Breakdown ◽  
Phase Field Model ◽  
Phase Field Modeling ◽  
Field Modeling ◽  
Ferroelectric Single Crystal

The coupled evolution of domain structure and dielectric breakdown is simulated via a phase-field model.

Phase Field Modeling for Grain Growth of Static Recrystallization of Deformed Alloys

2011 ◽  
Vol 399-401 ◽  
pp. 1785-1788
Author(s):  
Ying Jun Gao ◽  
Zhi Rong Luo
Keyword(s):  
Grain Growth ◽  
Phase Field ◽  
Field Model ◽  
Static Recrystallization ◽  
Phase Field Model ◽  
Free Energy Function ◽  
Phase Field Modeling ◽  
Field Modeling ◽  
Storage Energy ◽  
Good Agreement

A multi-state free energy function for deformation alloy with storage energy is proposed to simulate the microstructure evolution of static recrystallization with phase field model. The grain growth and grain size distribution during recrystallization are discussed. The simulation results are in good agreement with other theoretical or experimental results.

Side-branch growth in two-dimensional dendrites. II. Phase-field model

2005 ◽  
Vol 71 (5) ◽  
Author(s):  
R. González-Cinca ◽  
Y. Couder ◽  
A. Hernández-Machado
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Side Branch ◽  
Two Dimensional ◽  
Branch Growth

Two-Dimensional Phase-Field Model Applied to Freezing into Supercooled Melt

2004 ◽  
Vol 2 (2) ◽  
pp. 113-124 ◽  
Author(s):  
Ying Xu ◽  
J.M. McDonough ◽  
K.A. Tagavi ◽  
Dayong Gao
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Two Dimensional ◽  
Supercooled Melt

Permeation of oil-in-water emulsions through coalescing filter: Two-dimensional simulation based on phase-field model

AIChE Journal ◽  
2016 ◽  
Vol 62 (7) ◽  
pp. 2525-2532 ◽  
Author(s):  
Yasushi Mino ◽  
Yusuke Kagawa ◽  
Hideto Matsuyama ◽  
Toru Ishigami
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Two Dimensional ◽  
Oil In Water ◽  
Simulation Based ◽  
Dimensional Simulation

scholarly journals Lattice Phase Field Model for Nanomaterials

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7317
Author(s):  
Pingping Wu ◽  
Yongfeng Liang
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Lattice Parameter ◽  
Grid Spacing ◽  
Field Equations ◽  
Future Directions ◽  
Superlattice Structure ◽  
Field Modeling ◽  
Phase Field Equations

The lattice phase field model is developed to simulate microstructures of nanoscale materials. The grid spacing in simulation is rescaled and restricted to the lattice parameter of real materials. Two possible approaches are used to solve the phase field equations at the length scale of lattice parameter. Examples for lattice phase field modeling of complex nanostructures are presented to demonstrate the potential and capability of this model, including ferroelectric superlattice structure, ferromagnetic composites, and the grain growth process under stress. Advantages, disadvantages, and future directions with this phase field model are discussed briefly.

Phase-Field Modeling of Dendritic Solidification in Undercooled Droplets Processed by Electromagnetic Levitation

2006 ◽  
Vol 508 ◽  
pp. 431-436 ◽  
Author(s):  
Peter K. Galenko ◽  
Dieter M. Herlach ◽  
G. Phanikumar ◽  
O. Funke
Keyword(s):  
Phase Field ◽  
Dendritic Growth ◽  
Field Model ◽  
Phase Field Model ◽  
Electromagnetic Levitation ◽  
Dendritic Solidification ◽  
Field Modeling ◽  
Theoretical Predictions ◽  
Forced Convective Flow ◽  
Undercooled Melts

The results on modeling dendritic solidification from undercooled melts processed by the electromagnetic levitation technique are discussed. In order to model the details of formation of dendritic patterns we use a phase-field model of dendritic growth in a pure undercooled system with convection of the liquid phase. The predictions of the phase-field model are discussed referring to our latest high accuracy measurements of dendrite growth velocities in nickel samples. Special emphasis is given to the growth of dendrites at small and moderate undercoolings. At small undercoolings, the theoretical predictions deviate systematically from experimental data for solidification of nickel dendrites. It is shown that small amounts of impurities and forced convective flow can lead to an enhancement of the velocity of dendritic solidification at small undercoolings.

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