Finite element analysis of 3-D braided composites

Abstract A numerical method, which utilizes the computer aided geometric modelling (CAGM) in conjunction with finite element procedures, is presented to prediict the mechanical behavior of 3-D braided composites. The CAGM, based on the computer geometric technique and textile formation process, provides the detailed information of the fiber architecture of 3-D braided composites. With the fiber architecture being defined, unit cell structures can be identified and be treated as space structures. Then, finite element procedures can be performed on each cell to obtain the elastic behavior of the composites. The present analysis includes the consideration of the interior and boundary elements of the entire cross-section, and consideration of bending moment of the yarns. The present model predicts a lower value of Young's modulus than that of experimental results. Modifications will be made on how to properly represent the matrix affect of a 3-D braided composite.