Manufacturing method for pre-buried fiber grating composite material laminated plate

A composite material layer and composite material technology are applied in the field of pre-embedded fiber grating composite material laminate manufacturing, which can solve the problems of being easily broken, unable to transmit optical signals, and easily broken optical fibers, and achieve the effect of improving the survival rate.

Active Publication Date: 2014-12-10
AVIC COMPOSITES
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Problems solved by technology

It is impossible to transmit optical signals into the interior of the composite structure and monitor the condition and life of the composite
[0004] The traditional method is to directly lead the ordinary fiber grating from the surface or section of the composite structure. Because of the high temperature and high pressure, the coating layer on the surface of the ordinary fiber grating melts, and the fiber grating after melting the coating layer has the disadvantages of mold removal, transportation and processing. The disadvantage of being easily broken; the method of embedding the protective sleeve into the composite material and leading the optical fiber from the protective sleeve is also easy to cause the optical fiber to be easily broken during demoulding, transportation and processing

Method used

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  • Manufacturing method for pre-buried fiber grating composite material laminated plate

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Experimental program
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Effect test

Embodiment

[0022] Taking a 400×500×1.8 (mm×mm×mm) 10-layer composite laminate with two ordinary fiber gratings pre-embedded as an example, the implementation of this molding process is described.

[0023] Laminate layup is (+45° / -45° / Fiber / 0° / 0° / 90° / 90° / 0° / 0° / Fiber / -45° / +45°) using T700 / BA9906-2 Prepreg, single layer thickness 0.15mm, Fiber means laying fiber grating sensor,

[0024] First of all, the length of intercepting ordinary fiber grating is about 300mm. Such as figure 1 shown.

[0025] Secondly, intercept 2 sections of high temperature fiber grating, the length is about 500mm. And welded with the above-mentioned ordinary fiber grating. When welding, it is necessary to remove the coating layer of high-temperature optical fiber and ordinary optical fiber. You can put the high-temperature optical fiber on an alcohol lamp to grill, remove the coating layer and clean it with alcohol.

[0026] Thirdly, the welded optical fiber grating is pre-embedded in the composite material pre...

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Abstract

The invention belongs to the technology of composite material structure forming process, and relates to a manufacturing method for a pre-buried fiber grating composite material laminated plate. By utilizing the characteristic that a high-temperature fiber is good in storage of coating layer and better in tenacity under the conditions of high temperature and high pressure, the high-temperature fiber is combined with an ordinary fiber grating, the ordinary fiber grating and a portion of the high-temperature fiber are pre-buried in a composite material pre-forming structure, so that the defect that the fiber is easily broken during the demolding, transporting and processing process can be effectively avoided under the precondition that the sensing function of the grating is guaranteed and the structural performance of the composite material is guaranteed, and the survival rate of the pre-buried fiber grating is improved.

Description

technical field [0001] The invention belongs to the composite material structure molding process technology, and relates to a method for manufacturing a pre-embedded optical fiber grating composite material laminated plate. Background technique [0002] As a new type of sensor, the fiber grating sensor has many advantages: light weight, high precision, anti-interference, easy to form a network, real-time monitoring of damage status and life prediction of composite laminated structures. Optical fiber sensing technology has been widely used in civilian fields, and some of them have been applied to the development of aviation and aerospace structures. [0003] The fiber grating sensor is pre-embedded in the composite material laminate, and the laminate can be sensed and predicted. However, the composite laminate structure cured at medium temperature usually enters an autoclave and undergoes high temperature and high pressure treatment. The curing temperature of the laminate st...

Claims

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Application Information

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IPC IPC(8): G02B6/02
Inventor 石庆华石林
Owner AVIC COMPOSITES
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