Sample preparation method for carbon fiber tensile property test

Abstract

The invention discloses a sample preparation method for carbon fiber tensile property test, and the sample preparation method is implemented by a sample preparation device. The device comprises a main support, a central shaft, at least two multifilament-winding frames, fixed rods and extensible rods, the central shaft is mounted on the main support, the fixed rods and the extensible rods are used for supporting the multifilament-winding frames, one end of each fixed rod and one end of each extensible rod are fixed with the multifilament-winding frames correspondingly, and the other end of each fixed rod and the other end of each extensible rod are fixed on the central shaft. The sample preparation method includes the steps: firstly, preparing epoxy resin glue solution, then winding a to-be-tested carbon fiber multifilament on the multifilament-winding frames, and subjecting the to-be-tested carbon fiber multifilament to impregnation in the epoxy resin glue solution for 0.5-10min; secondly, placing the carbon fiber multifilament back to the main support after impregnation is finished, adjusting the extensible rods to control the tension of the carbon fiber multifilament subjected to impregnation, and adjusting the carbon fiber multifilament to be flat; and thirdly, drying for 30-120min at the temperature of 60-150 DEG C prior to cooling, and cutting off the cured carbon fiber multifilament to prepare a test sample. By the sample preparation method, sample preparation time can be shortened greatly, the test sample can be flat, uniformity of the sample is guaranteed, and finally accuracy of test results is guaranteed.

Description

technical field [0001] The invention relates to the field of preparation methods of material test samples, in particular to a sample preparation method for carbon fiber tensile performance testing. Background technique [0002] Carbon fiber refers to inorganic material fibers with a carbon fiber content of more than 90%. It has a series of properties such as low density, light weight, high specific strength, high specific modulus, small thermal expansion coefficient, high temperature resistance, wear resistance, corrosion resistance, and fatigue resistance. Excellent performance, so it is widely used in aerospace, sports and leisure, civil and other fields. [0003] The content of the carbon fiber mechanical performance test mainly includes: tensile strength, tensile modulus of elasticity, elongation at break, bulk density, linear density, etc. The test method has already been established in the national standard GB / T 3362-2005 carbon fiber multifilament tensile properties ...

AI Technical Summary

Problems solved by technology

Although this technical solution overcomes the shortcomings of unstable manual sample preparation and the relatively long cycle of sample preparation and testing, the use of winding machine dipping in the sample preparation process cannot control the tension of carbon fiber multifilaments, and it is easy to make carbon fiber multifilaments Uneven force, resulting in carbon fiber multifilament breakage

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