Gradient piezoelectric fiber composite material and preparation method thereof

Abstract

The invention discloses a gradient piezoelectric fiber composite material, which comprises two interdigitated electrodes, piezoelectric fibers and a high-molecular polymer, wherein the volume percent of the piezoelectric fibers is 45%-90%; and the volume percent of the high-molecular polymer is 10%-55%; the piezoelectric fibers and the high-molecular polymer are alternately arranged; and the volume fraction of the single piezoelectric fiber is in a continuous gradient change along with the transverse direction of the gradient piezoelectric fiber composite material. The gradient piezoelectric fiber composite material disclosed by the invention has high flexibility and excellent piezoelectric drive characteristic; the continuously changing drive deformation capacity can be provided in the transverse direction of the composite material; and the gradient piezoelectric fiber composite material integrates the piezoelectric fibers, the polymer and the interdigitated electrodes into a whole, and is high in integration level and convenient to operate and use. In addition, the gradient piezoelectric fiber composite material is prepared by a cutting-filling method, and is simple in process, low in cost, short in production cycle and stable in product performance.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric composite materials, and relates to a gradient piezoelectric fiber composite material and a preparation method thereof. Background technique [0002] The intelligent structure that appeared in the 1990s has changed people's inherent understanding of traditional materials and structures. After more than 20 years of development, the technical field of smart materials and smart structures has made great progress, and has become one of the important technical means to perceive and drive the main structure. As the core component of smart structures, smart materials can respond to changes in the external environment and internal conditions to adapt to different needs. Among them, piezoelectric ceramics have become a class of smart materials widely used due to their high structural rigidity, large driving force, fast electromechanical response conversion, and the ability to interact with dynamic s...

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Problems solved by technology

[0005] The degree of vibration or deformation control required in the deformation area of ​​the large main structure is not the same. In order to maintain the continuity of the vibration or deformation control of the main structure, it is necessary to apply different driving voltages to the laid multi-piece piezoelectric fiber composite materials, thereby greatly The complexity of the driving power supply system is increased, and the driving force between adjacent pieces of piezoelectric fiber composite materials changes in steps, which makes it difficult to maintain a stable and continuous vibration or deformation control of the main structure, which may easily lead to distortion points or area

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