Abstract
Shock wave compression of poled PZT95/5 ceramics results in rapid depoling and a release of bound charge. Porous PZT95/5 ceramics are superior to dense ceramics in high-voltage breakdown resistance under shock-wave loading. In this article, the mechanical and electrical responses of porous poled PZT95/5 ceramics under uniaxial stresses at different strain rates were investigated using the servo-hydraulic MTS810 universal test machine and the improved split Hopkinson pressure bar system. The engineering stress vs. axial and radial engineering strain curves of porous poled PZT95/5 ceramics under different strain rates exhibit anomalous nonlinear behavior. The nonlinear behavior and depolarization mechanism of porous poled PZT95/5 were attributed to the domain switching and phase transformation. By comparing the stress–strain curves of the porosity porous poled PZT95/5 ceramics at different strain rates, an obvious strain rate sensitivity of mechanical behavior can be found, and the strain rate sensitivity decreases with the increase of porosity. The critical stress of domain switching and phase transformation and the strength increased with increasing strain rate. In addition, their normalized values showed a logarithmic relationship with the strain rate. Finally, we suggest that the maximum polarization released is nearly independent of stress state and strain rate, and it only depends on the porosity.
Highlights
Zirconium-rich lead titanate Pb(Zr0.95 Ti0.05 )O3 (PZT95/5) ferroelectric ceramics exhibit a transformation from the ferroelectric phase (FE) to the antiferroelectric phase (AFE) in response to compressive stress [1,2,3,4], and they have been utilized in pulsed power applications for many years [4,5,6,7]
We showed that the nonlinear deformation process was caused by domain on various ceramics have demonstrated that the failure of brittle material has obvious strain rate switching (DS) and phase transformation (PT), which was proved by analyzing the axial strain vs
The strain rate effect of porous ceramics can be expressed by the DIF logarithmic regression equation as follows: As discussed earlier, the nonlinear mechanism of porous poled ceramics under uniaxial stress loading is caused by domain switching (DS) and PT
Summary
Zirconium-rich lead titanate Pb(Zr0.95 Ti0.05 )O3 (PZT95/5) ferroelectric ceramics exhibit a transformation from the ferroelectric phase (FE) to the antiferroelectric phase (AFE) in response to compressive stress [1,2,3,4], and they have been utilized in pulsed power applications for many years [4,5,6,7]. As part of an ongoing effort to understand the detailed nonlinear mechanical behavior of PZT95/5 ceramics, we have carried out a to microstructural differences in materials of the same density, and the charge-releasing rate was faster large number of quasi-static uniaxial compression tests [14]. The experiments on various ceramics have demonstrated that works were almost exclusively concerned with the behavior of porous PZT95/5 ceramics under the failure of brittle material has obvious strain rate sensitivity and it strongly dependent on defects shock-wave loading with strain rates from 104 s−1 to 105 s−1 and quasi-static loading with strain rates (i.e., voids, cracks) [15,16,17]. The effects of strain rate on the mechanical characteristics and depolarization behavior will be discussed
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