Details
| Original language | English |
|---|---|
| Pages (from-to) | 75-91 |
| Number of pages | 17 |
| Journal | Computers and Structures |
| Volume | 208 |
| Early online date | 12 Jul 2018 |
| Publication status | Published - 1 Oct 2018 |
Abstract
Bi-layer structures can be engineered to investigate the interfacial polarization (Maxwell-Wagner polarization) of heterogeneous dielectric material, which shows the frequency-dependent property of the effective dielectric permittivity. However, in piezoelectric or flexoelectric heterostructures, behaviors of the effective piezoelectric or flexoelectric coefficients are remained unclear. Therefore, in this work, we present a numerical model of the Maxwell-Wagner polarization effect in a bi-layer structure made of piezoelectric or flexoelectric material. In this model, the conductivity, which qualitatively represents the free charge in a real dielectric material, is introduced to the complex dielectric permittivity. Several numerical examples are performed to validate the model and investigate the frequency dependence of the effective dielectric permittivity, piezoelectric and flexoelectric coefficients as well as the giant enhancement of dielectric constants. It is found that the static (at low frequency) and the instantaneous (at high frequency) effective coefficients are governed by those of the thin and thick layer, respectively. Moreover, both conductivity and volume ratio play essential roles in the enhancement of the dielectric constant that is underpinned by the Maxwell-Wagner effect.
Keywords
- Colossal dielectric constant, Flexoelectric, Maxwell-Wagner polarization, Piezoelectric
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanical Engineering
- Computer Science(all)
- Computer Science Applications
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Computers and Structures, Vol. 208, 01.10.2018, p. 75-91.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Numerical model for the characterization of Maxwell-Wagner relaxation in piezoelectric and flexoelectric composite material
AU - Nguyen, B. H.
AU - Zhuang, Xiaoying
AU - Rabczuk, Timon
N1 - Funding Information: The first and second authors owe the gratitude to the sponsorship from Sofja Kovalevskaja Programme of Alexander von Humboldt Foundation. The second author thankfully acknowledges the funding State Key Laboratory of Structural Analysis for Industrial Equipment (GZ1607) and National Science Foundation of China (11772234). We also thank Dr. Nanthakumar Srivilliputtur Subbiah for fruitful discussion. Comments and suggestions from the Reviewers are greatly appreciated.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Bi-layer structures can be engineered to investigate the interfacial polarization (Maxwell-Wagner polarization) of heterogeneous dielectric material, which shows the frequency-dependent property of the effective dielectric permittivity. However, in piezoelectric or flexoelectric heterostructures, behaviors of the effective piezoelectric or flexoelectric coefficients are remained unclear. Therefore, in this work, we present a numerical model of the Maxwell-Wagner polarization effect in a bi-layer structure made of piezoelectric or flexoelectric material. In this model, the conductivity, which qualitatively represents the free charge in a real dielectric material, is introduced to the complex dielectric permittivity. Several numerical examples are performed to validate the model and investigate the frequency dependence of the effective dielectric permittivity, piezoelectric and flexoelectric coefficients as well as the giant enhancement of dielectric constants. It is found that the static (at low frequency) and the instantaneous (at high frequency) effective coefficients are governed by those of the thin and thick layer, respectively. Moreover, both conductivity and volume ratio play essential roles in the enhancement of the dielectric constant that is underpinned by the Maxwell-Wagner effect.
AB - Bi-layer structures can be engineered to investigate the interfacial polarization (Maxwell-Wagner polarization) of heterogeneous dielectric material, which shows the frequency-dependent property of the effective dielectric permittivity. However, in piezoelectric or flexoelectric heterostructures, behaviors of the effective piezoelectric or flexoelectric coefficients are remained unclear. Therefore, in this work, we present a numerical model of the Maxwell-Wagner polarization effect in a bi-layer structure made of piezoelectric or flexoelectric material. In this model, the conductivity, which qualitatively represents the free charge in a real dielectric material, is introduced to the complex dielectric permittivity. Several numerical examples are performed to validate the model and investigate the frequency dependence of the effective dielectric permittivity, piezoelectric and flexoelectric coefficients as well as the giant enhancement of dielectric constants. It is found that the static (at low frequency) and the instantaneous (at high frequency) effective coefficients are governed by those of the thin and thick layer, respectively. Moreover, both conductivity and volume ratio play essential roles in the enhancement of the dielectric constant that is underpinned by the Maxwell-Wagner effect.
KW - Colossal dielectric constant
KW - Flexoelectric
KW - Maxwell-Wagner polarization
KW - Piezoelectric
UR - http://www.scopus.com/inward/record.url?scp=85049747715&partnerID=8YFLogxK
U2 - 10.1016/j.compstruc.2018.05.006
DO - 10.1016/j.compstruc.2018.05.006
M3 - Article
AN - SCOPUS:85049747715
VL - 208
SP - 75
EP - 91
JO - Computers and Structures
JF - Computers and Structures
SN - 0045-7949
ER -