A low-abrasion three-dimensional forming method for z-direction fibers of composite materials

Abstract

The invention relates to a low-wear three-dimensional forming method of Z-direction fibers of composite materials. The steps of the method of the present invention are as follows: Wrap the outer layer of the Z-direction fiber with slurry to construct a Z-direction array with good bundling property and wear resistance; , Y-direction gaps are arranged, and the weaving layer is compacted in stages. After the prefabricated body is formed and weaved, the slurry in the outer layer of the fiber in the prefabricated body is removed to obtain high compactness, good comprehensive performance, and strong structural stability. 3D composite preforms. The Z-direction fiber low-wear three-dimensional forming method of the composite material proposed by the present invention improves the bundling and stiffness of the Z-direction fiber bundles, so that the Z-direction array formed by the Z-direction fiber bundles has higher structural stability. At the same time, through the surface slurry The wrapping of the material reduces the wear of the Z-direction fiber bundles and ensures the comprehensive performance of the composite material prefabricated body.

Description

technical field [0001] The invention relates to the technical field of composite material prefabricated body manufacturing, in particular to a low-wear three-dimensional forming method for Z-direction fibers of composite materials. Background technique [0002] Three-dimensional composite materials have the advantages of high damage tolerance, good interlayer performance, strong crack growth resistance, and flexible structural design, and are widely used in cutting-edge fields such as aerospace and national defense. At present, the forming methods of three-dimensional composite materials mainly include quasi-three-dimensional forming methods such as three-dimensional weaving, three-dimensional weaving, fine weaving, puncture, suture, and acupuncture. The main technical method is to introduce a third-dimensional reinforcement in the Z direction of the composite material, which can effectively Improve the interlayer bonding strength of composite materials. [0003] The most i...

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Problems solved by technology

[0003] The main difference between the above three-dimensional forming methods of composite materials is the introduction of Z-direction reinforcements. Among them, the three-dimensional weaving and three-dimensional weaving methods all introduce X, Y, and Z three-dimensional fibers at the same time. Different from the realization of the forming of the three-dimensional structure composite material preform, the Z-direction fibers are in the state of tow, which is soft and easy to weave into shape. Therefore, the Z-direction fibers will form an interlocking structure with the X and Y-direction fibers, making the Z-direction fibers Local buckling, reducing the reinforcement of the Z-direction fibers

The methods of fine-knitting puncture, suture, and needle punching use external force to place Z-direction fibers into the preform, and the Z-direction fibers are not directly connected to the in-plane fiber layer, thereby reducing the integrity of the preform after forming. At the same time, The Z-direction fibers are all subsequently introduced into the in-plane fiber layer. When the Z-direction fiber penetrates the in-plane fiber layer, it is very easy to cause wear of the Z-direction fiber and the in-plane fiber, and finally reduces the reinforcing effect of the fiber, thereby reducing the strength of the composite material. Comprehensive performance