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Test sample for tensile properties of large tow carbon fiber multifilament and sample preparation method thereof

A technology of tow carbon fiber and tensile properties, which is applied in the field of large tow carbon fiber multifilament tensile properties test specimens and sample preparation, can solve the problems of test result gap, tear damage, fiber tow slippage, etc. Achieve the effects of avoiding tear damage, increasing interface bonding force, and improving tensile strength

Active Publication Date: 2018-08-31
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Referring to the sample preparation method in the national standard GB / T 3362-2005, the 24k and above carbon fiber standard samples were prepared. During the test, the clamping part of the sample was torn and damaged, causing the fiber tow in the sample to slip, thus There is a large gap between the test result and the given value of the standard sample

Method used

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  • Test sample for tensile properties of large tow carbon fiber multifilament and sample preparation method thereof
  • Test sample for tensile properties of large tow carbon fiber multifilament and sample preparation method thereof
  • Test sample for tensile properties of large tow carbon fiber multifilament and sample preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Use 5N tension to wind T700S-24K carbon fiber multifilament from Toray Corporation of Japan on the frame; add 100 parts by mass of diglycidyl phthalate, 50 parts by mass of tetrahydrophthalic anhydride and 0.5 parts by mass of N ,N-Dimethylbenzylamine, then add 100 parts of acetone and stir for 5 minutes, pour into the dipping tank; immerse the frame of the winding multifilament in the dipping tank for 1 minute, take it out and let it dry for 1 minute, then put it in the drum Dry and solidify in an air oven. The multifilament curing process is (140°C / 0.5h)+(180°C / 1.5h). After cooling, it is cut into a 30cm multifilament section. The two sections of the multifilament section are flat and about 5cm in length. , the middle part is cylindrical; a group of aluminum alloy reinforcing sheets (single sheet thickness 1mm) are attached to both ends of the multifilament section, and four layers of J-47A structural adhesive film (single sheet thickness 1mm) are attached to the upper...

Embodiment 2

[0056] Wind the X720S-36K carbon fiber multifilament of Toray Corporation of Japan on the frame with a tension of 10N; add 100 parts by mass of 3,4-epoxycyclohexyl 3',4'-epoxycyclohexyl methyl ester, 60 parts by mass to a 5L measuring cup Part of methyl nadic anhydride and 2 parts by mass of 2,4,6-tris(dimethylaminomethyl)phenol, then add 120 parts of toluene and stir for 5 minutes, pour into the dipping tank; immerse the frame of winding multifilament After 2 minutes of dipping, take it out of the dipping tank and let it dry for 2 minutes, then place it in a blast oven to dry and solidify. The multifilament curing process is (150°C / 1h)+(200°C / 3h). After cooling, it is cut into 30cm multifilament segments , the two sections of the multifilament section are flat, and the length is about 5cm, and the middle part is cylindrical; a group of aluminum alloy reinforcement sheets (single sheet thickness 3mm) are respectively attached to the two ends of the multifilament section, and th...

Embodiment 3

[0058] Use 10N tension to wind STS-48K carbon fiber multifilament of Japan Toho Co., Ltd. on the frame; add 100 parts by mass of 3,4-epoxycyclohexyl 3',4'-epoxycyclohexyl methyl ester, 100 parts by mass to a 5L measuring cup Parts of hexahydrophthalic anhydride and 3 parts by mass of 2-ethyl-4-methylimidazole, then add 150 parts of xylene and stir for 5 minutes, pour into the dipping tank; dip the frame of the winding multifilament into the dipping tank After 3 minutes, take it out and let it dry for 3 minutes, then place it in a blast oven to dry and solidify. The multifilament curing process is (150°C / 2h)+(200°C / 3h). After cooling, it is cut into 30cm multifilament segments. The two sections of the section are flat, and the length is about 5cm, and the middle part is cylindrical; a group of glass fiber reinforced plastic reinforcement sheets (single piece thickness 2mm) are respectively attached to the two ends of the multifilament section, and the upper and lower inner surfa...

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Abstract

The invention relates to a test sample for tensile properties of a large tow carbon fiber multifilament and a sample preparation method thereof, and belongs to the field of material property testing.The method comprises the steps that tension is applied to wind the carbon fiber multifilament of not less than 24 k around a frame; gum dipping, gum leaching and heat curing are conducted on the framewound with the multifilament, and the gum-dipped multifilament is cut into multifilament segments after cooling; a set of metal or composite reinforcing sheets are respectively bonded to the two endsof the multifilament segments, wherein each set includes two reinforcing sheets disposed oppositely, a structure glue film is bonded to the inner surface of at least one of the two reinforcing sheets, the middle region and the peripheral edge region of the inner surface are vacated in bonding, and the two ends of the multifilament segments are located in the middle region; the reinforcing sheetsare pressed, heated and cured to obtain the test sample. By adopting the method, the mechanical properties of the reinforcing sheets are improved, the bonding strength between the multifilament and the reinforcing sheets is improved, and the problems of tear damage of the reinforcing sheets and debinding and slippage of fiber when the obtained test sample is used in a tensile test are avoided.

Description

technical field [0001] The invention relates to a large tow carbon fiber multifilament tensile performance test sample and a sample preparation method thereof, belonging to the field of material performance testing. Background technique [0002] Carbon fiber can be divided into large and small tows according to the number of single filaments in a bundle of fibers. Generally speaking, carbon fibers with specifications below 24k (each fiber contains 24,000 filaments) are called small tows, while carbon fibers with specifications of 24k and above are called large tow carbon fibers. Because large-tow carbon fiber has the advantages of low price, easy source, and comparable performance to small-tow carbon fiber, its composite materials are widely used in infrastructure, sports equipment, automobile industry and wind power equipment. The development of material preparation technology will also be applied in aerospace and other fields in the future. [0003] Objective and accurat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 朱世鹏高建丽杨云华冯志海潘月秀李龙
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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