Microstructure analysis of 3-dimensional 7-directional braided structure

The planar and spatial yarn paths were analyzed systematically based on a 3D braiding process. A geomet ric unit cell model of the three-dimensional and seven-directional braided composite is established to describe thebasic st ructure , and the relationship between braiding parameters is deduced. This paper proposes the base for theanalysis of the mechanical properties of 3D and 7D braiding composites.