Electromechanial Characterization Of The Piezoelectric Structure Fiber And Composites

Piezoelectric materials can realize conversion between mechanical energy and electric energy. Single phase piezoelectric material brittle and prone to fracture damage.Piezoelectric composites overcome the shortcomings of single phase piezoelectric materials.Ordinary piezoelectric fiber composites requires significantly higher voltages to achieve full actuation. The hollow fiber composite was proposed In order to overcome the drawbacks of the solid fiber composites. In the hollow fiber composite the electric filed is applied through the thickness of the hollow fiber; from the inner and outer surfaces, reducing the actuation voltage required.This paper is devoted to study the performance of the piezoelectric hollow fiber and its composites. The main research content as follows:(1) Using finite element method to calculate the two different piezoelectric material the electric field inside the cylindrical shell. Finite element results and the approximate theoretical results are compared and analyzing the differences in both the electric field distribution and the average electric field, Piezoelectric cylindrical shell axial stress were analyzed.using the finite element method.(2) Considering the electrode layer thickness, the analytical expression of the effective piezoelectric coefficient was deduced and the influence of the clamping force and the vertical first-order natural frequency by the thickness of the piezoelectric shell and electrode layer is discussed.(3) The analytical expressions of effective piezoelectric coefficient of Piezoelectric fibre structure composite is given. Discussing the thickness of piezoelectric shell fiber, volume fraction of piezoelectric structure fiber and flexibility coefficient of matrix influence on the effective piezoelectric coefficient...