Axial continuous shearing strain piezoelectric fiber composite material and preparation method thereof

Abstract

The invention discloses an axial continuous shearing strain piezoelectric fiber composite material and a preparation method thereof. The axial continuous shearing strain piezoelectric fiber compositematerial is composed of multiple piezoelectric ceramic fibers, a high-molecular polymer and two flexible interdigital electrodes, and the piezoelectric fibers polarized in the thickness direction andthe high-molecular polymer are alternately arranged in parallel; and the flexible interdigital electrodes are compounded on the upper sides and the lower sides of the piezoelectric fibers and the high-molecular polymer, the upper flexible interdigital electrode and the lower flexible interdigital electrode are in mirror symmetry, the electrode finger parts of the flexible interdigital electrodes are perpendicular to the axial direction of the piezoelectric ceramic fibers, and the piezoelectric ceramic fibers are continuous in the axial direction. The axial continuous shearing strain piezoelectric fiber composite material has certain flexibility and is continuous in stress and strain in the axial direction of the piezoelectric ceramic fibers, the driving capacity of the piezoelectric fibercomposite material is enhanced, and a large bending strain exists in a shearing direction; in addition, the axial continuous shearing strain piezoelectric fiber composite material is prepared by adopting a cutting-filling method, a technological process is simple, cost is low, and product stability is good.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to an axial continuous shear strain piezoelectric fiber composite material and a preparation method thereof. Background technique [0002] Piezoelectric fiber composite material is a functional composite material in which piezoelectric fibers with rectangular cross-section are arranged in parallel in a three-dimensional interconnected polymer matrix and encapsulated in interdigitated electrodes. Compared with traditional piezoelectric ceramics, the components of this type of material learn from each other, which not only ensures good piezoelectricity, but also has a certain degree of flexibility, and has outstanding unidirectional performance, strong machinability, and large driving force. The control system is simple and other advantages, and it is a research hotspot in the field of piezoelectric composite materials in recent years. [0003] The working mode of piezoe...

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Problems solved by technology

However, this structure needs to be arranged alternately in parallel with the well-polarized piezoelectric ceramic fibers and polymers. During the curing process, the angle between the polarization of the fibers and the driving electric field is difficult to control, that is, it is difficult to maintain a vertical state.

Kranz et al. proposed a piezoelectric fiber composite structure in which the polarization is along the length direction of the piezoelectric ceramic fiber, the direction of the driving electric field is along the thickness direction, and the fingers of the upper and lower electrodes are perpendicular to the axial direction of the piezoelectric ceramic fiber. Electroceramic fibers are polarized axially and require very high polarization voltages, making it difficult to fabricate large-scale structures

In the patent of a preparation method of shear piezoelectric fiber composite material (authorized announcement number: CN107910434A), it is proposed to polarize along the thickness direction, and the direction of the driving electric field is along the width direction, that is, the fingers of the interdigitated electrodes and the piezoelectric ceramics A shear-type piezoelectric fiber composite structure in which the axial direction of the fiber is parallel, but the piezoelectric ceramic fiber and the polymer are alternately connected in this structure, and the axial direction of the driver is perpendicular to the axial direction of the piezoelectric ceramic fiber, resulting in The shear stress and strain generated by the piezoelectric ceramic fiber due to the driving electric field is absorbed by the polymer layer during the transmission process, and the stress and strain transmission is discontinuous

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