主要期刊论文

Modeling of Poling Behavior of Ferroelectric 3-3 Composites




作者: HY Zhang, LX Li et al
发表/完成日期: 2005-10-05
期刊名称: International Journal of Engineering Science
期卷: 43, 13-14 (2005)
相关文章: 08(2005IJES).pdf   
论文简介
Piezoelectric 3–3 composites are often prepared from unpoled PZT ceramics and polymer matrices. During
the poling process the PZT cannot deform freely due to the clamping by the surrounding polymer,
which after poling results in the occurrence of residual mechanical stress in the composite. Based on the
multi-linear constitutive model of ferroelectric and ferroelastic piezoceramics, a nonlinear finite element
analysis was performed within the representative volume element to model the poling behavior of this kind
of composites, in which appropriate periodic boundary conditions were prescribed for the displacements
and the electric field of the composites. Considering the fact from experimental data that changes of the
remanent strain induced by the switching process are volume preserving, we introduced different criteria
in evaluating the maximum and minimum values of the ferroelastic strain Sf. A numerical simulation
was then conducted to investigate the effects of different poling voltages and volume fractions of the
PZT ceramic on the distribution of residual mechanical stress in the PZT of composites. The results show
that if Vf < 18% a portion of the compressive mechanical stress in the poling direction on the PZT ceramic
may cause a mechanical depolarization of the PZT ceramic.