Self-powered and self-sensing piezoelectric composite material, preparation method and application thereof

By adding PVDF and BTO to composite materials, piezoelectric composite materials are prepared. The piezoelectric effect and electrostatic induction principle are used to realize self-powered and self-sensing online monitoring, which solves the problem of real-time online detection of composite material structural health monitoring and provides a new monitoring method.

CN116940205BActive Publication Date: 2026-06-23TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TONGJI UNIV
Filing Date
2023-07-18
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve self-powered, self-sensing, online real-time monitoring of composite materials. Nanogenerators have problems in composite material damage monitoring, such as small monitoring range, reduced mechanical properties due to integration, and susceptibility to external interference.

Method used

PVDF and barium titanate (BTO) are added to a resin solution and mixed with reinforcing fibers. After polarization treatment, a piezoelectric composite material is prepared, and self-powered real-time monitoring is achieved by utilizing the piezoelectric effect and electrostatic induction principle.

Benefits of technology

It achieves self-powered and self-sensing monitoring of the health status of composite material structures, possesses excellent mechanical properties and high sensitivity, and can monitor the structural health status in real time, simplifying the detection process.

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Abstract

The application relates to a piezoelectric composite material, in particular to a self-powered and self-sensing piezoelectric composite material and a preparation method and application thereof, and comprises the following steps: S1: adding PVDF and barium titanate into a resin solution, carrying out layering with reinforcing fibers after stirring and mixing, and curing and forming; S2: placing the composite material obtained in the step S1 in a strong electric field for polarization, and then packaging to obtain the piezoelectric composite material. Compared with the prior art, the application solves the problem that the nanogenerator cannot be well applied to composite material structure health monitoring in the prior art, realizes good application of the piezoelectric composite material in the composite material structure health monitoring, and realizes self-powered real-time online self-sensing monitoring of the structure health state of the composite material by using the piezoelectric nanogenerator principle.
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