A method for forming a rectangular reinforced pipe fitting made of carbon fiber composite material

Abstract

The invention belongs to the technical field of forming of carbon fiber reinforced resin matrix composite structures, and relates to a forming method for a rectangular carbon fiber composite reinforced pipe fitting. The reinforcing ribs of the rectangular carbon fiber reinforced resin matrix composite reinforced pipe fitting prepared by adopting the method cannot generate distortion deformation; inner-cavity round corners and an outline round corner of the pipe fitting are relatively regular, and stress concentration points are reduced, so that the mechanical properties of products are ensured; in addition, the method is simple to operate, and the reliability in quality of the products is high. The forming method has the advantages that wound mandrels are rigid molds, winding equipment can be fully utilized, and efficiency is higher; mold-filling and demolding are simple and easy to operate, and forming pressure is stable and controllable.

Description

technical field [0001] The invention relates to a forming method of a rectangular reinforced pipe fitting of carbon fiber composite material, and belongs to the technical field of structural forming of carbon fiber reinforced resin-based composite material. Background technique [0002] Carbon fiber reinforced resin matrix composite material rod and tube structure is a typical unit of composite material components. It is a commonly used structural component in aviation and spacecraft structures. Most large satellite antenna brackets use carbon fiber reinforced resin matrix composite material pipe fittings. [0003] Carbon fiber reinforced resin matrix composite material pipes are usually formed by fiber winding, prepreg layering, pultrusion molding, heat shrinkage molding and other processes. There are two forms, one is external pressurization and the other is internal pressurization. The shape of the composite square tube with external pressure has no rounded corners, and ...

AI Technical Summary

Problems solved by technology

The following disadvantages exist in the preparation of rectangular reinforced pipe fittings of carbon fiber reinforced resin matrix composites by thermal expansion molding method: (1) Difficult lay-up operation; (2) Difficult to control molding pressure; (3) The wall thickness of the product is not Distortion and deformation; (4) There are many internal defects in the product

[0005] The difference between inflatable airbag pressurization and thermal expansion soft mold pressurization is that the inflatable airbag pressurization method is to wrap the airbag around the mandrel, connect the airbag with the external pressure source, and use the external pressure source to inflate and pressurize. There are the following disadvantages in the preparation of carbon fiber reinforced resin matrix composite rectangular reinforced pipe fittings by pressing method: (1) The operation process is complicated and the demoulding is difficult; (2) The inner cavity precision of the product is poor, and the ribs are twisted and deformed

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