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Enhancing the operational range of piezoelectric actuators by uniaxial compressive preloading

Koruza, Jurij and Franzbach, Daniel and Schader, Florian and Rojas, Virginia and Webber, Kyle G. (2015):
Enhancing the operational range of piezoelectric actuators by uniaxial compressive preloading.
48, In: Journal of Physics D: Applied Physics, (21), pp. 215302(1-8), ISSN 0022-3727, [Online-Edition: http://dx.doi.org/10.1088/0022-3727/48/21/215302],
[Article]

Abstract

The influence of the uniaxial preload on the off-resonance actuation performance of piezoelectric ceramics was investigated for compressive preload values up to  −80 MPa. The study was performed on soft-type lead zirconate titanate (PZT), being the most widely used piezoelectric material. The samples were analysed using the proportional loading method, which enables the simultaneous application of electrical and mechanical loads, thereby mimicking the real operation conditions over the full stress–strain range. An increase of the blocking stress and the longitudinal piezoelectric stress coefficient was observed for all the applied preload values. The optimum properties, a blocking stress of  −56 MPa and a free strain of 0.23%, were obtained at a preload value of  −40 MPa and electric field of 2 kV mm  −  1. This represents an increase of 16% and 20%, respectively, as compared to the values obtained at the smallest preload. In addition, the maximum work output was increased by about 28%. Finally, the results obtained at the lowest preload of  −4 MPa using the proportional loading method were compared to the operational ranges determined by other methods. The comparison revealed large discrepancies between the methods, originating from the different order of the application of electrical and mechanical fields and the inherent nonlinearity of ferroelectric materials. This discrepancy results in decreased actuator performance due to impedance mismatching, demonstrating the need for accurate determination of the actuator's operational range.

Item Type: Article
Erschienen: 2015
Creators: Koruza, Jurij and Franzbach, Daniel and Schader, Florian and Rojas, Virginia and Webber, Kyle G.
Title: Enhancing the operational range of piezoelectric actuators by uniaxial compressive preloading
Language: English
Abstract:

The influence of the uniaxial preload on the off-resonance actuation performance of piezoelectric ceramics was investigated for compressive preload values up to  −80 MPa. The study was performed on soft-type lead zirconate titanate (PZT), being the most widely used piezoelectric material. The samples were analysed using the proportional loading method, which enables the simultaneous application of electrical and mechanical loads, thereby mimicking the real operation conditions over the full stress–strain range. An increase of the blocking stress and the longitudinal piezoelectric stress coefficient was observed for all the applied preload values. The optimum properties, a blocking stress of  −56 MPa and a free strain of 0.23%, were obtained at a preload value of  −40 MPa and electric field of 2 kV mm  −  1. This represents an increase of 16% and 20%, respectively, as compared to the values obtained at the smallest preload. In addition, the maximum work output was increased by about 28%. Finally, the results obtained at the lowest preload of  −4 MPa using the proportional loading method were compared to the operational ranges determined by other methods. The comparison revealed large discrepancies between the methods, originating from the different order of the application of electrical and mechanical fields and the inherent nonlinearity of ferroelectric materials. This discrepancy results in decreased actuator performance due to impedance mismatching, demonstrating the need for accurate determination of the actuator's operational range.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume: 48
Number: 21
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D6: The effect of electric field-induced phase transitions on the blocking force in lead-free ferroelectrics
11 Department of Materials and Earth Sciences > Material Science
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
11 Department of Materials and Earth Sciences
Zentrale Einrichtungen
Exzellenzinitiative
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Exzellenzinitiative > Graduate Schools > Graduate School of Computational Engineering (CE)
Exzellenzinitiative > Graduate Schools
Date Deposited: 22 Apr 2015 07:45
Official URL: http://dx.doi.org/10.1088/0022-3727/48/21/215302
Additional Information:

SFB 595 D6

Identification Number: doi:10.1088/0022-3727/48/21/215302
Funders: This work was financially supported by the Deutsche Forschungsgemeinschaft under SFB 595/D6 and benefited from the support of the DFG under WE 4972/1-1.
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