Whole-process online monitoring method and device for carbon fiber composite material

Abstract

The invention belongs to the field of material science and engineering, and discloses an online monitoring method and device for the whole forming-service process of a carbon fiber composite material.According to the monitoring method, the temperature change in the forming process of the carbon fiber composite material and the health state in the service process are monitored by utilizing the pyroelectric effect and the piezoelectric effect of the multifunctional material. The monitoring device comprises a multifunctional material which responds to temperature and strain and serves as a signal source generator, an external circuit which is connected with a lead negative electrode led out of the multifunctional material and a component surface positive electrode, and a processor. Accordingto the invention, real-time monitoring of temperature, stress and strain in the forming process and the service process of the carbon fiber composite material can be realized, so that monitoring of the whole forming-service process is realized, the influence of addition of various sensing monitoring systems on the performance of the component is reduced, and intelligent monitoring of the carbon fiber composite material component is realized.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and relates to an on-line monitoring method and a monitoring device for the whole process of carbon fiber reinforced composite material forming and service, and more specifically, relates to a whole process monitoring technology of carbon fiber reinforced composite material forming and service. Background technique [0002] Due to the advantages of high specific strength and high specific modulus, carbon fiber reinforced composite materials are widely used in aerospace, rail transit, civil engineering, energy and other fields, such as aircraft fuselage, submarine propeller, engine blade, wind power blade, etc. However, due to the complex production process of composite materials, it is easy to cause defects such as incomplete curing and thermal stress warping due to large temperature fluctuations and unevenness during the forming process, and these defects cause damage to components...

AI Technical Summary

Problems solved by technology

[0004] 1. Acoustic emission detection technology is widely used in stress and strain detection. It is mainly used to monitor the damage state of carbon fiber composite materials during service. It is difficult to detect temperature, and acoustic emission detection technology requires additional sensors for detection. Sensors It is easily affected by the external environment during installation and service, and its online monitoring application range is limited

[0005] 2. Although the FBG sensor used in fiber Bragg grating sensing technology can detect temperature, stress, and strain changes during forming and service, the use of FBG sensors requires the arrangement of leads to pre-embed them in components, and the demoulding stage of composite materials is easy. The lead wire is damaged, and the lead wire affects the installation of composite components, so the FBG sensor generally used for forming monitoring does not have the function of service monitoring; not only that, the diameter of the optical fiber is several times that of carbon fiber, which affects the mechanical properties of the component. Reduce the service life of the components, so the fiber grating sensor is used for the detection of service performance, and the patch method is often used

[0006] Therefore, due to the fragility of the sensing system, the interface binding with the resin matrix, and the adaptability to service conditions have not been effectively resolved, acoustic emission detection technology and optical fiber sensing technology cannot simultaneously monitor and control the curing process. Monitoring of the health status of the service process, that is, it is impossible to realize the whole process of forming-service monitoring

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