13 August 2003 Characterization of loaded prestressed piezoelectric actuators
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Over the past few years, actuators have been characterized and analyzed under several different boundary conditions. One of these conditions is loading, which plays a critical part in any application where the actuator is used in a structure. This study concentrated on comparing the displacement under load for different types of actuators of the same length and width, but having different layer compositions. The same load and excitation frequency was used at different voltages. Eleven different groups of devices were tested with metal thickness ratios (MTR - ratio of metal thickness to the total thickness) varying between 0.3 and 0.44. The metals used were stainless steel and brass. The results indicated that the devices with an MTR between 0.31 and 0.37 were able to lift a load of 76 grams. All the devices with this MTR had a ceramic thickness of 0.38mm and stainless steel or brass backing. It was also observed that the positive and negative peak displacements were equal for most devices except for the devices with a metal to PZT thickness ratio of 1 showing a negative peak displacement more than 65% higher than positive peak displacement. This may be due to differences in location of the neutral axis, distribution of pre-stresses, and deformations of the devices under load. It was found that the maximum displacement per applied voltage per mm of ceramic thickness was produced by the devices, which had an MTR of 0.33 to 0.37, with no top, and with a ceramic thickness of 0.38mm.
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Karla M. Mossi, Karla M. Mossi, Lisa A. Scott, Lisa A. Scott, Shivan Haran, Shivan Haran, } "Characterization of loaded prestressed piezoelectric actuators", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484687; https://doi.org/10.1117/12.484687

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