A method and device for monitoring the internal temperature field during the forming process of a three-dimensional woven composite material

A molding process and composite material technology, applied in measuring devices, thermometers, thermometers with physical/chemical changes, etc., can solve problems such as difficult to realize three-dimensional weaving temperature field monitoring, reduce test monitoring costs, improve survival rate, The effect of increasing strength

Active Publication Date: 2022-01-07
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It is difficult to monitor the internal temperature field during the forming process of 3D woven composite materials with existing technologies

Method used

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  • A method and device for monitoring the internal temperature field during the forming process of a three-dimensional woven composite material
  • A method and device for monitoring the internal temperature field during the forming process of a three-dimensional woven composite material
  • A method and device for monitoring the internal temperature field during the forming process of a three-dimensional woven composite material

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Embodiment 1

[0040] Such as Figure 1-3 As shown, the working process of monitoring the internal temperature field during the forming process of three-dimensional woven composite materials includes:

[0041] (1) Select a number of standard optical fibers 1 with diameter (125 μm), coated with polyimide coating 2 on the outside, grating segment 4 length 4mm, and FBG sensor 6 with a central wavelength of 1500nm-1600nm, and cut the optical fiber on one side of the grating segment , use polyimide wire strippers to strip off the coating of the grating segment (or ablate the grating segment with fire, wipe it off with alcohol after the coating turns black), use 0.9mm diameter steel pipe 3 to set into the grating segment, and The edges are sealed with silicone rubber.

[0042] (2) Before the fiber bundle is spun, first determine the weft yarn 5 corresponding to the position to be measured, and extract part of the fiber bundle in the weft yarn, so that the total thickness of the remaining fiber bu...

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Abstract

The present invention provides a method and device for monitoring the internal temperature field in the forming process of a three-dimensional woven composite material. The method includes: using an FBG sensor to replace part of the fibers in the weft corresponding to the position to be measured; pulling the FBG sensor to fix the grating section to the position to be measured measuring position; start spinning and feeding yarn, so that the warp yarn wraps the weft yarn containing the FBG sensor and then generates a three-dimensional woven preform; puts the three-dimensional woven preform into a mold for mold clamping, and the optical fiber of the FBG sensor from Leading out of the mold, the temperature change of the material is obtained according to the wavelength change of the FBG sensor. The invention can monitor the temperature field and its evolution process in real time during the solidification and molding process of the three-dimensional woven composite material structure.

Description

technical field [0001] The invention relates to the technical field of material testing, in particular to a method and device for monitoring the internal temperature field during the forming process of a three-dimensional woven composite material. Background technique [0002] In addition to high specific strength and high specific modulus, three-dimensional woven composite materials also have properties such as delamination resistance and impact resistance that traditional laminated composite materials lack. However, due to various factors such as the large difference in its component phase mechanics and thermodynamic properties, it is easy to cause internal residual stress and strain. For parts with large thickness, uneven heating and temperature are very likely to occur during the curing molding process. Gradients, etc., resulting in molding deformation of the three-dimensional woven composite material, reducing the molding quality of the part. Therefore, it is necessary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/3206
CPCG01K11/3206
Inventor 任明法王琦王博王磊李桐蔡雅琪姜海林杨旭锋
Owner DALIAN UNIV OF TECH
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