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22 June 2000 Actuator environmental stability
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Various configurations of piezoelectric high strain actuators are available in the market. The influence of humidity at high temperature is not well documented, even though it is an important consideration for actuator performance. This paper describes the testing and results of two different families of actuators; QuickPack products and multilayer actuators, tested under two environments; room temperature low humidity and elevated temperature and humidity (80°C/80%RH). A constant DC load was applied to the QP10N andand QP10Ni products in free condition, while positive only AC field was applied to multilayer actuators, under pre-stressed condition. High field IR was used as the main tool to determine the health of QuickPack products, whereas, in-situ displacement was measured to monitor the health of multilayer actuators. As expected, in both families of actuators, it was shown that the actuator life is significantly reduced when specimens are exposed to humidity at elevated temperature. Improvement of the humidity barrier, thus less moisture penetration, even when electrodes do not contain silver, is expected to prolong life of actuators.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shoko Yoshikawa and Michael Farrell "Actuator environmental stability", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000);

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