Gum dipping method in preparation of high strength carbon fiber tensile property test sample

A carbon fiber tow and tensile performance technology, applied in the field of carbon fiber performance testing, can solve problems such as low elongation at break, large influence of seasonal environmental humidity on test results, unstable failure mode, etc., to ensure accuracy and small dispersion , the effect of destroying the stability of the mode

Inactive Publication Date: 2013-04-17
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there is a national standard (GB / T3362-2005) for the test method of the mechanical properties of carbon fiber, the elongation at break of the impregnated resin system used in this standard is all lower than 3%, which is only applicable to the elongation at break not greater than 1.5% T300 grade carbon fiber tow test
For T700, T800 and T1000 high-strength carbon fiber tows with elongation at break higher than 1.5%, if this dipping method is used, the failure mode of the sample during the test will be unstable, the test results will be highly discrete, and the test results will be affected. Seasonal environmental humidity has a great influence and cannot accurately reflect the mechanical properties of high-strength carbon fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Mix epoxy resin LY-1, curing agent LY-1H, and acetone (excellent grade) in a ratio of 100:33:145, and stir for 5 minutes to prepare dipping glue; machine method is used for T700S Immerse the carbon fiber tow at room temperature for 2 minutes; squeeze out the excess glue by machine; place the dipped T700S carbon fiber tow in a fume hood at room temperature for 12 hours to make the acetone evaporate completely; then dry it The carbon fiber tow was placed in a blast oven and heated to 80°C, and kept for 120 minutes to completely cure the sample. Finally, the mechanical performance test of T700S carbon fiber was completed according to the remaining steps in GB / T3362-2005. The average tensile strength of T700S carbon fiber was measured to be 5260MPa, and the average tensile modulus was 230Gpa. The average tensile strength of T700S carbon fiber is 4925MPa and the average tensile modulus is 231Gpa, which is completely operated according to GB / T3362-2005.

Embodiment 2

[0020] Example 2: Mix epoxy resin LY-1, curing agent LY-1H and acetone (premium pure) in a ratio of 100:33:160, and stir for 10 minutes to prepare dipping glue; use manual method for T800H Immerse the carbon fiber tow at room temperature for 4 minutes; remove the excess glue by hand; place the dipped T800H carbon fiber tow in a fume hood at room temperature for 24 hours to completely evaporate the acetone; then dry it The carbon fiber tow was placed in a blast oven and heated to 90°C, and kept for 120 minutes to completely cure the sample. Finally, the mechanical performance test of T800H carbon fiber was completed according to the remaining steps in GB / T3362-2005. The average tensile strength of T800H carbon fiber was measured to be 5820MPa, and the average tensile modulus was 295Gpa. The average tensile strength of T800H carbon fiber tested in accordance with GB / T3362-2005 is 5510MPa, and the average tensile modulus is 292Gpa.

Embodiment 3

[0021] Example 3: When the indoor humidity is about 80%RH in summer, mix epoxy resin LY-1, curing agent LY-1H and acetone (premium pure) in a ratio of 100:33:150, and stir for 8 minutes to prepare Impregnate the glue solution; use the machine method to impregnate the T700S carbon fiber tow at room temperature for 3 minutes; use the machine method to squeeze out the excess glue solution; place the dipped T700S carbon fiber tow in a fume hood at room temperature for 18 hours, Let the acetone evaporate completely; then place the dried carbon fiber tow in a blast oven and heat it to 85°C, and keep it warm for 120 minutes to completely cure the sample. Finally, the mechanical performance test of T700S carbon fiber was completed according to the remaining steps in GB / T3362-2005. The average tensile strength of T700S carbon fiber was measured to be 5245MPa, and the average tensile modulus was 231Gpa. The average tensile strength of T700S carbon fiber is 4790MPa and the average tensil...

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Abstract

The invention belongs to the carbon fiber performance test technique, and relates to an improvement of a gum dipping method in preparation of a high strength carbon fiber tensile property test sample. The gum dipping method is characterized in that the gum dipping method comprises the steps of gum liquor preparation, gum liquor dipping, gum extrusion, drying and curing. According to the gum dipping method in preparation of the high strength carbon fiber tensile property test sample, the accuracy of the high strength carbon fiber tensile property test can be ensured.

Description

technical field [0001] The invention belongs to the carbon fiber performance testing technology, and relates to the improvement of the dipping method in sample preparation during the tensile performance test of carbon fiber tow. Background technique [0002] Carbon fiber is an inorganic non-metallic fiber material with a carbon content of more than 93%. It has a series of advantages such as high specific strength, high specific modulus, low thermal expansion coefficient, high temperature resistance, and corrosion resistance. It is often used as an advanced composite material. Reinforced materials are widely used in various fields of national production such as aerospace, weaponry and transportation. In order to give full play to the performance of carbon fiber composite materials, carbon fiber and its matrix resin need to be used together, so it is particularly important to accurately characterize the mechanical properties of carbon fiber. At present, although there is a na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/30
Inventor 罗云烽彭公秋谢富原
Owner AVIC COMPOSITES
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