Geometric modeling for 3D 4-directional braided composites based on preform boundary reflection method

Owing to the complexity of the yarn paths inside the preform, the geometric modeling for it is always time consuming. An efficient method, namely preform boundary reflection (PBR) method, was proposed, and the computation time to establish the model of yarns motion in geometric modeling process was shortened effectively. Furthermore, CAD simulation system was developed based on the SolidWorks software. Integral geometric descriptions of 3D braided preform with different parameters could be simulated. Compared with the traditional method, the PBR method significantly shor-tens the simulation time without affecting the precision of preform geometric modeling. As a result, the efficiency of braiding process design is effectively accelerated. The new method establishes the foundation of microstructure and mechanical properties analysis of the preforms with complex geometric structures.