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Because that most of piezoelectric functional devices are combined with the coatings of electric conductor or dielectric media and the piezoelectric substrate, the study on the interactions between them is valuable for their advanced design. In this paper, a method for the electro-mechanical coupling fields in these piezoelectric functional devices is presented. Firstly, the two-dimensional Green’s function for a normal line force or line charge is derived. Then, based on the obtained Green’s function, the interaction mechanism between the coatings of electric conductor or dielectric media and the piezoelectric substrate is studied. Finally, the electro-mechanical coupling fields under arbitrary loads are obtained by superposition principle and Gauss integration. Numerical results show that this method has high computational precision, efficiency and stability. And it can be used to improve the reliability and working performance of the piezoelectric functional device effectively

aip advances

Study on the interactions between the coatings of electric conductor or dielectric media and piezoelectric substrate in the piezoelectric functional devices