Cryogenic electromechanical behavior of multilayer piezo-actuators for fuel injector applications
Cryogenic electromechanical behavior of multilayer piezo-actuators for fuel injector applications
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DOI：
10.1063/1.3656445
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发表时间：
2011-10
影响因子：
3.2
通讯作者：
Y. Shindo;F. Narita;T. Sasakura
中科院分区：
文献类型：
--
作者：
Y. Shindo;F. Narita;T. Sasakura
本文从理论和实验两方面研究了用于喷油器的多层压电致动器在低温下的机电特性。采用热力学模型预测单斜相。随着温度的降低，在准同型相界（MPB）之间的四方相和菱方/单斜相的位移被确定，并获得与温度相关的压电系数。根据畴壁能预测了温度对矫顽电场的影响。然后进行有限元分析，计算的多层压电致动器的非线性机电场从室温到低温温度，由于MPB和极化切换的移位。此外，电场诱导应变的实验结果，验证了该模型。
This paper examines theoretically and experimentally the electromechanical behavior of multilayer piezo-actuators for fuel injectors at cryogenic temperatures. A thermodynamic model was employed to predict a monoclinic phase. A shift in the morphotropic phase boundary (MPB) between the tetragonal and rhombohedral/monoclinic phases with decreasing temperature was determined, and the temperature dependent piezoelectric coefficients were obtained. Temperature dependent coercive electric field was also predicted based on the domain wall energy. A finite element analysis was then performed to calculate the nonlinear electromechanical fields of the multilayer piezo-actuators from room to cryogenic temperatures, due to the shift in the MPB and polarization switching. In addition, experimental results on the electric field induced strain, which verify the model, were presented.