Study on the friction characteristics of the bonding point of variable cross-section three-dimensional braided yarn increase based on the bonding method

In the process of using adhesive method for variable cross-section 3D weaving, the introduction of adhesive at the yarn increasing point greatly increases the friction and wear between carbon fibers, which can lead to a decrease in the overall performance of the prefabricated component. In response to the above issues, a self-made experimental fixture was developed to test the friction and wear performance between carbon fibers in bonding process. The effects of friction angle, preloaded tension, and friction frequency on the friction properties between carbon fiber bundles were investigated. Solidworks is used to model bonded carbon fiber bundles with a friction angle of 90 degrees, and ABAQUS is used to simulate the friction of the bonded carbon fiber bundle. The experimental results show that stress concentration occurs in the center of the friction area, and the wear degree at the center is more obvious, and the number of fiber breaks at the center was more than that of the side. Friction angle has great influence on friction coefficient, while pre-tensioning and friction frequency had a negligible effect. Based on the above results, when performing variable cross-section 3D weaving, it is recommended to increase the spacing between adjacent carriers and shorten the distance between the weaving chassis and the prefabricated parts. Additionally, it is advised to reduce the pre-added tension on the carrier device and increase the knitting frequency as much as possible within the scope of working conditions. The study results are of great significance for developing 3D weaving devices in terms of theoretical and engineering guidance.