Low-wear three-dimensional forming method for Z-directional fibers of composite material

Abstract

The invention relates to a low-wear three-dimensional forming method for Z-directional fibers of a composite material. The method comprises the following steps: coating the outer layers of the Z-directional fibers with slurry to construct a wear-resistant Z-directional array which is good in bundling property; arranging the X- and Y-directional fibers along X- and Y-directional gaps of the array according to a structural model of a prepared part and compacting a woven layer in stages; and after weaving and forming a prefabricate, removing the slurry from the outer layers of the fibers in the prefabricate to obtain the three-dimensional composite material prefabricate which is high in compactness, good in comprehensive performance and high in structural stability. The bundling property andthe stiffness of the Z-directional fiber bundle are improved by means of the low-wear three-dimensional forming method for Z-directional fibers of the composite material, so that the Z-directional array formed by the Z-directional fiber bundle has higher structural stability, and meanwhile, wear of the Z-directional fiber bundle is reduced by being coated by surface slurry, so that the comprehensive performance of the composite material prefabricate is ensured.

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] 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 importa...

AI Technical Summary

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