Method for preparing carbon fiber composite interlaminar shear strength spline

Abstract

The invention relates to a method for preparing a composite interlaminar shear strength spline, and belongs to the field of testing of composites. The method comprises the following steps: a), calculating the number of carbon fiber needed according to the specification of the carbon fiber and the content of fibers in the composite spline and; b), weighing and preparing proper amount of epoxy resinglue solution, hot-melting the epoxy resin glue solution in an oven to transparent; c) putting the carbon fiber on an uncoiling stand, guiding into a glue dipping tank, pouring the hot-melted epoxy resin glue solution into the glue dipping tank, immersing the fiber, winding corresponding number of the fibers dipped with the glue solution on a winding plate; d) taking off the fiber dipped with theglue solution on the winding plate by using a blade, folding symmetrically by three times, straightly putting into a groove of a mould tank body, wherein groove is preheated in the oven and is evenlycoated with a releasing agent; e) putting the fiber and the tank body together into the oven of 140 DEG C, heating for 60 minutes, taking out the mould tank body when the glue solution is hardened, putting back into the oven of 140 DEG C again, continuing to heat for 60-90 minutes, taking out and then applying the pressure of 150-280 N.m again, solidifying in the oven of 160 DEG C for 2-4 hours,cooling, demoulding, and cutting into the testing spline at the desired size.

Description

technical field [0001] The invention relates to the field of composite material testing, in particular to a method for preparing a carbon fiber composite material interlaminar shear strength sample. Background technique [0002] Carbon fiber is a new type of carbon material with a carbon content of more than 90% produced by high-temperature carbonization at 1300-1600°C. It has high specific strength, high specific modulus, high temperature resistance, corrosion resistance, fatigue resistance, radiation resistance, electrical conductivity, and heat transfer. , shock absorption, noise reduction and other excellent properties, are widely used in high-tech fields such as aviation and aerospace, and are important strategic materials. As a brittle material, carbon fiber is seldom used alone, and it is mostly combined with epoxy resin to make composite materials to give full play to its excellent properties. Because the mechanical properties of carbon fiber reinforced resin matrix ...

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Problems solved by technology

As a brittle material, carbon fiber is seldom used alone, and it is mostly combined with epoxy resin to make composite materials to give full play to its excellent properties. Because the mechanical properties of carbon fiber reinforced resin matrix composites depend on the bonding between the resin matrix and the reinforced carbon fiber interface Therefore, the level of shear strength between carbon fiber layers is often used to measure the quality of bonding performance. At present, the process commonly used to prepare carbon fiber interlayer shear strength splines is: one is to use the unwinding device to unwind the carbon fiber tow Unwinding, and then lead into the glue tank through the godet roller, and wind up the unidirectional prepreg cloth through the winding roller. The other is to uniformly coat the resin through the coating process, and then obtain the unidirectional The prepreg is then cut, laminated, vacuum pressed, dried to form a flat plate and mechanically cut into a sample that meets the requirements. These two sample preparation methods are not only complicated in process and long in process, but also occupy a large area of ​​sample preparation equipment. The space is large, not suitable for use in the laboratory and one person cannot complete the sample preparation operation. In addition, the number of carbon fiber tubes required in the sample preparation process will also cause unnecessary waste