A preparation method of braided composite material semi-circular tube with reduced curing springback

Abstract

The invention provides a method for preparing a braided composite material semi-circular tube with reduced curing springback, comprising the following steps: relatively fastening the first U-shaped mandrel and the second U-shaped mandrel to an elliptical-shaped mandrel; combining carbon fiber and glass The fiber is prepared into a fabric reinforcement by circular braiding method; the carbon fiber and glass fiber are woven into each layer on the outer layer of the elliptical mandrel, and the joints of the elliptical mandrel are fixed by tape, and cut along the cutting line. Separate the upper and lower parts of the fabric reinforcement to obtain two U-shaped fabrics; place the cut U-shaped fabric in a U-shaped mold to cure to obtain a U-shaped composite material tube; cut the excess part of the U-shaped composite material tube to obtain A fiber-reinforced composite material with a semicircular tube structure; the invention cuts the fabric at the joint of the U-shaped mandrel to effectively cut out a fabric reinforcement comprising a semicircle, which can effectively reduce the curing rebound of the semicircular tube of the composite material and ensure that the semicircular tube of the composite material the preparation accuracy.

Description

Technical field [0001] The present invention relates to the field of fiber reinforced composite material preparation technology, specifically to a method for preparing a braided composite semicircular tube that reduces curing resilience. Background [0002] Carbon fiber reinforced composites have high strength and are mostly used in aerospace and other fields where lightweight is required, and fiber-reinforced composite components often need to be heated and cured. Although the curing process enhances the composite structure, residual stresses are also introduced, which remain in the structure after cooling, causing structural deformation of the part after being removed from the tool. [0003] Composite semicircular tubes have a wide range of application needs as commonly used structural parts, but the structural accuracy of semicircular tubes is also highly susceptible to curing rebound. This results in part parameters not meeting design specifications and making installation di...

AI Technical Summary

Problems solved by technology

Although the curing process strengthens the composite structure, it also introduces residual stresses that remain in the structure after cooling, causing structural deformation of the part after removal from tooling

[0003] As a common structural part, the composite material semicircular tube has a wide range of application requirements, but the structural accuracy of the semicircular tube is also easily affected by the curing springback

This leads to part parameters that do not meet the design specifications, and also makes installation difficult

And this may lead to the introduction of certain external forces during the assembly process, resulting in internal stress and even structural damage, affecting the service safety of components

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