Prepreg splicing strength detection method for automatic placement

A technology of splicing strength and detection method, which is applied in the directions of measuring devices, analyzing materials, using mechanical devices, etc., can solve the problems of insufficient quantitative characterization of prepreg splicing strength, and achieve simple and reliable testing methods, ensuring accuracy and guidance. sexual effect

Inactive 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

[0005] In order to solve the problem that the splicing strength of prepregs in the prior art cannot be fully quantitatively characterized, the present invention proposes a detection method for the splicing strength of prepregs for automatic laying

Method used

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  • Prepreg splicing strength detection method for automatic placement
  • Prepreg splicing strength detection method for automatic placement
  • Prepreg splicing strength detection method for automatic placement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put the two prepreg tows according to the figure 2 and image 3 The method and size of the pre-bonded pre-bonded sample and peeled sample, the length of the bonding surface of the two prepreg tows is 40mm, the main axis direction should be the same as the direction of the carbon fiber in the prepreg tow. Then put the bonding area 2 into the mechanical hot-pressing platform for hot-pressing splicing, and use polytetrafluoroethylene release cloth to isolate the prepreg tow and the hot-pressing platform. The splicing temperature is 30°C, the pressure is 0.2MPa, and the time is 3min. The obtained splice strength test specimens were tested with a tensile tester and a peel strength tester respectively. The distance between the end of the clamping area 1 and the nearest lap joint was 50mm, the test environment temperature was 15°C, and the load loading rate was 0.1m / min. The test results show that the tensile failure strength of the prepreg splicing strength sample is 202...

Embodiment 2

[0031] Put the two prepreg tows according to the figure 2 and image 3 The method and size of the two prepreg tows should be manually pre-bonded into a flat tensile sample and a peeled sample. The length of the bonding surface of the two prepreg tows is 25mm, 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 2 into a mechanical hot-pressing platform for hot-pressing splicing, and use a PE film to isolate the prepreg tow from the hot-pressing platform. The splicing temperature is 45°C, the pressure is 0.3MPa, and the time is 1min. The obtained splice strength test specimens were tested with a tensile tester and a peel strength tester respectively. The distance between the end of the clamping area 1 and the nearest lap joint was 90mm, the test environment temperature was 5°C, and the load loading rate was 4m / min. The test results show that the tensile failure strength of the prepreg splicing str...

Embodiment 3

[0033] Put the two prepreg tows according to the figure 2 and image 3The method and size of the two prepreg tows should be manually pre-bonded into a flat tensile sample and a peeled sample. The length of the bonding surface of the two prepreg tows should be 55mm, 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 2 into a mechanical hot-pressing platform for hot-pressing splicing, and use PP film to isolate the prepreg tow and the hot-pressing platform. The splicing temperature is 55°C, the pressure is 0.4MPa, and the time is 5min. The obtained splicing strength test specimens were tested using a tensile tester and a peel strength tester respectively. The distance between the end of the clamping area 1 and the nearest lap joint was 120mm, the test environment temperature was 20°C, and the load loading rate was 15m / min. The test results show that the tensile failure strength of the prepreg spl...

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Abstract

The invention relates to a prepreg splicing strength detection method for automatic placement, which belongs to the technical field of prepreg automatic placement forming. According to the requirementof ultra-long preprepreg tow in automatic placement forming technology, the invention provides a method for detecting the strength of prepreg tow splicing head for the first time. The invention analyzes the stress condition of the prepreg tow splicing head in practical application, measures the flat tensile failure strength at a joint by using a tensile tester, and measures the peeling damage strength at the joint by using a peeling tester. The two strength parameters obtained were used as the splicing strength of the prepreg in the flat state and the curved state respectively. Two differentangles are quantified to get the result. The invention is capable of fully reflecting the strength of the prepreg tow splicing head in practical applications.

Description

technical field [0001] The invention relates to a detection method for splicing strength of prepregs for automatic laying, and belongs to the technical field of automatic laying and molding of prepregs. Background technique [0002] Resin-based composite materials have the advantages of high specific strength and specific modulus, fatigue resistance, and strong designability, and are widely used in aerospace, rail transit, new energy, medical and health care, and sports equipment. Advanced composite materials represented by resin-based composite materials are being used more and more widely due to their excellent performance, and the automatic manufacturing technology of composite materials has always been the focus of industry development because it can greatly reduce the manufacturing cost of composite materials. The most important technology is the automatic lay-up molding technology of prepreg. The material used in automatic lay-up molding technology is prepreg, which i...

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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