Large-tow carbon fiber multifilament tensile sample and preparation device and method thereof

Abstract

The invention discloses a large-tow carbon fiber multifilament tensile sample and a preparation device and method thereof. The device comprises a main body support and a tensioning mechanism; the mainbody support comprises a first cross beam and a second cross beam which are arranged at an interval; the two ends of the first cross beam and the two ends of the second cross beam are connected through supporting frames; the first cross beam is provided with first fixed filament winding rods, and the first fixed filament winding rods are detachably sleeved with filament winding rings; the tensioning mechanism comprises a force bearing rod, screws, elastic parts, movable filament winding rods and nuts; the force bearing rod is arranged at one end, far away from the first cross beam, of the second cross beam; the movable filament winding rods are detachably sleeved with filament winding rings; each movable filament winding rod comprises a positioning rod and a filament winding rod; the positioning rods are perpendicular to the filament winding rods; the end surface, close to the force bearing rod, of the second cross beam is provided with positioning holes; the positioning rods are movably arranged in the positioning holes in the direction perpendicular to the second cross beam; the screws penetrate through the force bearing rod and are connected with the movable filament winding rods; the nuts are arranged on one side, far away from the second cross beam, of the screws; and the screws penetrate through the elastic parts and abut against the elastic parts, the force bearing rodand the movable filament winding rods.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a large tow carbon fiber multifilament tensile sample and a preparation device and method thereof. Background technique [0002] There are many kinds of public information about the sample preparation device and method of carbon fiber multifilament. ASTM standards, national standards and patents all have reports on mechanical or semi-mechanical sample preparation devices. However, each test sample only needs 6-6 10 samples, the length of which does not exceed 3m, adopts mechanical or semi-mechanical devices, and the time-consuming of wire loading and unloading is much longer than that of manual sample preparation. Therefore, manual dipping is generally used in the industry. In order to avoid direct human contact during manual dipping Glue, at present, a simple rectangular frame winding frame is widely used to prepare samples by winding the fiber tow first and...

AI Technical Summary

Problems solved by technology

[0003] There are some problems in the preparation of large tow carbon fiber multifilament tensile samples by manual dipping with the current small tow dipping device. One is the width of the sample. Taking the most commonly used 48K / 50K large tow carbon fiber as an example, the tow The width itself can reach more than 20mm, and in order to ensure uniform force, the width of the multifilament sample should generally be controlled at 5-10mm, and the actual carbon fiber dipping device currently used cannot control the width; due to the large tow carbon fiber The tension force is large, and it is difficult to meet the tension requirement of the fiber by manually applying tension. At the same time, because the sample has a certain width and is a flat sample, it should be straight and not twisted. In addition, in order to reduce the difficulty of operation and manual cleaning, it is preferable to adopt the method of wrapping first and then dipping. At present, the dipping process of small tow is to dip the entire wrapping rack into Glue, and the tensioning device is movable, so the tensioning device cannot be immersed in the glue when dipping, otherwise the glue will fix the tensioning device and cannot be reused

[0004] Due to the large carbon fiber tow, the volatilization rate of the internal solvent does not match the gelation time of the external resin during curing, resulting in many internal voids and defects in the prepared sample, which cannot reflect the real tensile properties of carbon fibers. At the same time, the tensile strength during the test is very high , the reinforcing sheet is easy to tear or slip off

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