| Autor: |
Fotinich, Y., Carman, G.P. |
| Předmět: |
|
| Zdroj: |
Ferroelectrics; Sep2002, Vol. 274 Issue 1, p101-119, 19p |
| Abstrakt: |
Piezoelectric polycrystalline ceramics consists of a large number of polarized crystallites (domains) oriented along random directions. When subjected to an excessive electro-mechanical load, each domain may undergo polarization switching resulting in a nonlinear macroscopic behavior of the piezoceramic. In this article a finite element code is developed to simulate this nonlinear behavior. The polycrystalline piezoceramic is modeled as an aggregate of finite elements with each domain represented by a finite element. Each element within this model is oriented in a random direction and is allowed to undergo polarization switchings when a criterion is exceeded. All domains are assumed to possess tetragonal structure. The dielectric, strain, and stress-strain macroscopic responses of the material are generated by the model. The analytical results are compared with experimental data and reasonable agreement is achieved. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
