Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7133748 | Sensors and Actuators A: Physical | 2018 | 14 Pages |
Abstract
In this work, we proposed a special designed multilayer actuator based on the periodically orthogonal poled (POP) PZT ceramics. Only the in-plane poled regions of the neighboring PZT layers were bonded together thus the large reversible switching strain in these regions can always be employed. A six-layer actuator was fabricated and testing results show that it can output actuation strains over 0.5% under a low field of 2â¯kV/mm at 0.1â¯Hz, about 3.5 times of that in conventional PZT actuators which is less than 0.15% under the same field. Furthermore, the output large strain is fairly uniform, which varies from 0.50% to 0.53% along the period direction, in comparison with that varying from 0.35% to 0.59% in a single-layer POP PZT. The large actuation strain drops quickly with the increasing frequency, and stabilized at about 0.2% under 2â¯kV/mm at or above 1â¯Hz. The low-frequency large strain is very stable and keeps unchanged after 20â¯k cycles of operation. To solve the charge accumulation problem during successive unipolar loading/unloading, an asymmetric bipolar field from â300â¯V/mm to 2â¯kV/mm is applied and meanwhile the actuation strain turns to be more uniform, only varying from 0.51% to 0.52% at 2â¯kV/mm. The low driving field, large strain of the proposed actuator makes it very promising in low-frequency, large strain/displacement actuation areas.
Related Topics
Physical Sciences and Engineering
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Authors
Qiangzhong Wang, Faxin Li,