Thesis
A numerical investigation of the effect of induced porosity on the electromechanical switching of ferroelectric ceramics
Washington State University
Master of Science (MS), Washington State University
2005
Handle:
https://hdl.handle.net/2376/427
Abstract
Ferroelectric ceramics have many applications ranging from microelectromechanical system (MEMS) to explosively driven power supplies. Besides chemical compositions and processing methods, porosity is an important material parameter that can affect both the electrical and mechanical responses of a ferroelectric. The main objective of the current study is to gain some preliminary insight on the possible effect of porosity on the switching behavior of ferroelectrics. Numerical simulation is used to address the research objective. The numerical code used is an arbitrary Lagrangian-Eulerian, multi-material, multi-physics nite element code developed by Sandia national Laboratories. A phenomenological electromechanical model developed by Landis is implemented in the code rst. The effects of void density which ranges from 0 to 11% and shape which includes sphere versus cylinder are then investigated through parametric study. The study indicates that the remanent polarization decreases with the increased porosity density. For a given density, the porous solid that contains the cylindrical voids whose longitudinal axis is perpendicular to the applied electric eld contains the largest amount of the remanent polarization. The solid that contains the cylindrical voids whose longitudinal axis is parallel to the applied electric eld has the least remanent polarization. The solid containing spherical voids possesses intermediate polarization. The possible reason for the geometry effect is that the void diverge the electric eld and the polarization along the applied electric eld direction. Different shapes of void result in different diverging effect. The limitation of the current numerical simulation and possible future work are also discussed.
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Details
- Title
- A numerical investigation of the effect of induced porosity on the electromechanical switching of ferroelectric ceramics
- Creators
- Morgan Brown
- Contributors
- Jow-Lian Ding (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525148501842
- Language
- English
- Resource Type
- Thesis