Method for detecting surface viscosity of prepreg tows for automatic tow placement

A surface sticky, automatic wire laying technology, applied in the direction of measuring devices, mechanical devices, instruments, etc., to avoid the influence of human errors, ensure accuracy and guidance, and test methods are simple and reliable.

Active Publication Date: 2019-04-05
AVIC COMPOSITES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no characterization and testing method for the surface viscosity of prepreg tows for automatic laying in the industry. Even the test methods for the surface stickiness of prepregs laid by hand are mainly qualitative characterization, such as rolling ball method, sticking Separation, etc.

Method used

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  • Method for detecting surface viscosity of prepreg tows for automatic tow placement

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put the two prepreg tows according to the figure 1 The method and size of the prepreg are manually pre-bonded first. The length of the bonding area 2 of the two prepreg tows is 40mm, and the direction of the main axis should be the same as that of the carbon fibers in the prepreg tows. Then put the bonded area into a mechanical hot-pressing platform for hot-pressing overlapping, and use a polytetrafluoroethylene release cloth to isolate the prepreg tow and the hot-pressing platform. The temperature of the lap joint is 24°C, the pressure is 0.1MPa, and the time is 2min. The obtained surface adhesion test sample is symmetrically clamped on the clamp of the tensile tester, and the distance between the end of the clamping area 1 of the clamp and the nearest overlapping end is 100 mm. Start the tensile tester, and the pull-off failure load of the prepreg tow sample is 198.2N.

Embodiment 2

[0026] Put the two prepreg tows according to the figure 1 The method and size of the prepreg are manually pre-bonded. The length of the bonding area 2 of the two prepreg tows is 35mm, and the direction of the main axis should be the same as that of the carbon fibers in the prepreg tows. Then put the bonding area into a mechanical heat press platform for heat press lapping, and use PE film to isolate the prepreg tow and the heat press platform. The temperature of the lap joint is 60°C, the pressure is 0.6MPa, and the time is 10min. The obtained surface adhesion test sample is symmetrically clamped on the clamp of the tensile tester, and the distance between the end of the clamping area 1 of the clamp and the nearest overlapping end is 80 mm. Start the tensile tester, and the pull-off failure load of the prepreg tow sample is 465.3N.

Embodiment 3

[0028] Put the two prepreg tows according to the figure 1 The method and size of the prepreg are manually pre-bonded first. The length of the bonding area 2 of the two prepreg tows is 60mm, and the direction of the main axis should be the same as that of the carbon fibers in the prepreg tows. Then put the bonded area into a mechanical hot-pressing platform for hot-pressing overlapping, and use a polyester film to isolate the prepreg tow from the hot-pressing platform. The temperature of the lap joint is 10°C, the pressure is 0.4MPa, and the time is 3min. The obtained surface adhesion test sample is symmetrically clamped on the clamp of the tensile tester, and the distance between the end of the clamping area 1 of the clamp and the nearest overlapping end is 150 mm. Start the tensile tester, and the pull-off failure load of the prepreg tow sample is 135.N.

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Abstract

The invention relates to a method for detecting the surface viscosity of prepreg tows for automatic tow placement, and belongs to the technical field of prepreg automatic tow placement molding. The method comprises the steps that firstly, two prepreg tows are pre-bonded, the main axis direction of the bonding surface of the two prepreg tows is the same as the direction of carbon fibers in the prepreg tows, then a bonding area is placed on a mechanical hot pressing platform for hot pressing lap joint, the prepreg tows are separated from the hot pressing platform by a demould material, a temperature required for the lap joint is 10DEG C-60DEG C, the pressure for the lap joint is 0.1MPa-0.6MPa, and the time for the lap joint is 1min-10min; and then, a sample is symmetrically clamped on a clamp of a tensile tester, the tensile tester is started, and a tensile failure load of the prepreg tow sample is used as a quantitative characterization result of the surface viscosity. A surface viscosity value of the prepreg tows obtained by the method can be directly used for comparing the surface viscosity of various materials, can further be used for exploring the influencing factors of the surface viscosity of the prepreg tows, and has wide application prospects in practical production and scientific research fields.

Description

technical field [0001] The invention relates to a detection method for the surface viscosity of a prepreg tow for automatic laying, and belongs to the technical field of automatic laying and forming of prepregs. Background technique [0002] Prepreg is a resin matrix impregnated with continuous fibers or fabrics under strictly controlled conditions to make a composition of resin matrix and reinforcement, and is an intermediate material for manufacturing composite materials. In the process of use, it is necessary to lay the prepreg on the corresponding mold according to the designed direction and number of layers, and then perform pressure curing and other operations to obtain a composite material with a specific shape and size. An important factor affecting the process performance of prepregs during use is the surface viscosity of prepregs, and its operational performance is closely related to surface viscosity, especially in the automatic lay-up and molding process of prepr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 闫鸿琛石峰晖张宝艳李嘉杜宇
Owner AVIC COMPOSITES
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