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Online monitoring method for liquidity of internal resin of fiber reinforced resin matrix composite material

A fiber reinforced resin, resin fluidity technology, applied in the field of composite fluidity testing and analysis, can solve the problems that the fluidity cannot be monitored online, and the resin fluidity cannot be characterized and measured, and achieves low cost, small size, and reduced porosity. Effect

Active Publication Date: 2018-10-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose an online monitoring of the resin fluidity inside the fiber-reinforced resin-based composite material to solve the problems that the resin fluidity cannot be characterized and measured in the current fiber-reinforced resin-based composite material, and the fluidity cannot be monitored online during the molding process. method

Method used

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  • Online monitoring method for liquidity of internal resin of fiber reinforced resin matrix composite material
  • Online monitoring method for liquidity of internal resin of fiber reinforced resin matrix composite material
  • Online monitoring method for liquidity of internal resin of fiber reinforced resin matrix composite material

Examples

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example 2

[0082] The difference between this example and Example 1 is that the heating rate in the temperature process is different. In this example, the heating rate is changed to 1°C / min and 5°C / min, and the rest are the same as the above-mentioned Example 1.

[0083] 1. The results of online monitoring of resin fluidity in composite materials are as follows: Image 6 As shown, it can be found that the effective resin flow time is 70min in the 1°C / min process, 19min in the 3°C / min process, and 18min in the 5°C / min process . It can be judged that there are significant differences in the effective resin flow time under different temperature processes.

[0084] 2. Cut a sample with a size of 20*5mm from the center of the composite material sample cured at three different heating rates, then observe the pore distribution under a microscope, and calculate the composite material sample according to the ratio of the pore area to the cross-section of the sample Porosity in . The porosity o...

example 3

[0086] The difference between this example and examples 1 and 2 is that the resin fluidity in the cross-laminated composite material is monitored online, and the optical fiber is placed along the fiber direction of any one of the two adjacent layers, and the fiber and optical fiber of this layer form half of the example 1. The sensing structure, such as Figure 8 shown. The capillary force in this structure still obeys the high-low-high step distribution, and the resin fluidity in the cross-laminated composite can still be monitored online.

example 4

[0088] The difference between this example and examples 1, 2 and 3 is that the sensor is used to monitor and control the flow state of resin during high-pressure molding of composite materials.

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Abstract

Provided is an online monitoring method for liquidity of internal resin of a fiber reinforced resin matrix composite material. An optical fiber is introduced into the fiber reinforced resin matrix composite material, high-low-high type capillary force step distribution is formed on the interface of the optical fiber, and a capillary force step difference sensor is designed and used for online monitoring of the liquidity of the resin among fibers inside the composite material. The sensor is small in size, can be put into the composite material to be used for online monitoring and control over the liquidity of the resin in the forming process, can also serve as a representation and measurement means of the liquidity of the resin of the fiber reinforced resin matrix composite material, fillsthe blank in the field of representation and measurement of the liquidity of the resin of the composite material, and contributes to analysis and research of the flowing behavior of the resin inside the composite material. The sensor has the advantages of being high in sensitivity and free of calibration in principle, so that the method has the considerable project application prospects.

Description

technical field [0001] The invention relates to a resin fluidity monitoring method in a fiber-reinforced resin-based composite material, in particular to an on-line monitoring method for resin fluidity between fibers of a fiber-reinforced resin-based composite material, belonging to the field of fluidity testing and analysis of composite materials. Background technique [0002] Fiber-reinforced resin-based composites have the advantages of high specific strength and specific stiffness, light weight, corrosion resistance, and fatigue resistance, and are widely used in the aviation field. With the development of aviation technology, composite materials are gradually applied to large and complex main load-bearing components. [0003] During the curing and molding process of composite materials, the resin fluidity between fibers is crucial to the molding quality, especially at the corners of large and complex composite components. If the fluidity is not properly controlled, it i...

Claims

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Application Information

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IPC IPC(8): B29C70/54
CPCB29C70/546
Inventor 李迎光何永喜
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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