Effects of loading contact on electric-power generation of lead zirconate titanate piezoelectric ceramic plate

Abstract

To better understand the generation of electric power for piezoelectric PbZrTiO 3 (PZT) ceramic plate (ϕ25 mm), an attempt was made to investigate experimentally and numerically electricpower generation characteristics during cyclic bending under various loading fixtures (ϕ0-ϕ20 mm), i.e., different contact areas. Increasing the load-contact area on the PZT ceramic leads to a nonlinear decrease in the generated voltage. Decreasing contact area basically enhances the generated voltage, although the voltage saturates during loading when the contact area is less than ϕ5 mm. A similar voltage is generated for ϕ0 and ϕ5 mm, which is attributed to strain status (ratio of compressive and tensile strain) and material failure due to different stress distribution in the PZT ceramic. On the basis of the obtained electric generation voltage, suitable loading conditions are clarified by loading with the ϕ5 mm fixture, which generates a higher voltage and a longer lifetime of the PZT ceramic. From this approach, it is appeared that the area contact with the area ratio of 0.04 (ϕ5 mm/ϕ20 mm) is suitable to obtain the high efficiency of the electric voltage.

Porous, multi-layered piezoelectric composites based on highly oriented PZT/PVDF electrospinning fibers for high-performance piezoelectric nanogenerators

“…Piezoelectric effect refers to the phenomenon in which the material without a center of structural symmetry changes its internal polarization with external pressure, giving rise to the same amount of heterogeneous charges on the surface. At first, perovskite piezoelectric ceramics ((K, www.springer.com/journal/40145 Na,Li)NbO 3 [1,2], BaTiO 3 [3], and Pb(Zr,Ti)O 3 [4,5]) and piezoelectric semiconductors (ZnS [6], ZnO [7], and CdS [8]) attracted lots of attention due to their excellent piezoelectric coefficients, but the brittleness of their own limited the application in flexible electric devices. On the contrary, piezoelectric polymer has good flexibility but much lower piezoelectric coefficient comparing to the piezoceramics/semiconductors.…”

Failure Characteristics of PZT Ceramic During Cyclic Loading

“…10 As can be seen, the voltage decreases in the early fatigue stage, following which it remains almost constant for all loading conditions. In our previous work, similar results were found at a lower load of 40 N. 10 The rate of decrease is clearly different for the 0-mm rod: in the early fatigue stage at less than 2000 cycles, the voltage drops significantly by about 15% for the 0-mm rod, while it drops by less than 10% for the other rods with diameters of 5-20 mm. These different electrical generation characteristics could be caused by different types of material failure.…”

“…9 Localized domain switching adjacent to a crack tip will have a significant effect on the stress intensity and energy release rate. Because domain switching is directly related to electrical generation characteristics, 10 there have been a number of investigations of domain orientations using x-ray diffraction (XRD) and electron backscatter diffraction (EBSD). 11,12 Because energy harvesting with PZT ceramics is not very efficient, an optimized harvesting technique is required.…”

“…Information on the fatigue properties of PZT ceramics is especially important for energy harvesting systems, because more than 90% of component failures are caused by fatigue. Therefore, the aim of the present work is to investigate the effect of material failures on electrical power generation under various cyclic loading conditions for a high number of cycles (10,000). This failure analysis, including domain switching, is conducted using EBSD.…”

Porous, Multi-layered Piezoelectric Composites Based on Highly Oriented Pzt/pvdf Electrospinning Fibers for High-performance Piezoelectric Nanogenerators

“…Piezoelectric effect refers to the phenomenon in which the material without a center of structural symmetry changes its internal polarization with external pressure, giving rise to the same amount of heterogeneous charges on the surface. At rst, perovskite piezoelectric ceramics ((K,Na,Li)NbO 3 [1,2], BaTiO 3 [3] and Pb(Zr,Ti)O 3 [4,5] and piezoelectric semiconductors (ZnS[6], ZnO [7] and CdS [8]) attracted lots of attention due to their excellent piezoelectric coe cients, but the brittleness of their own limits the application in exible electric devices. On the contrary, piezoelectric polymer has good exibility but much lower piezoelectric coe cient comparing to the piezoceramics/semiconductors.…”