In the braided fabric, all fiber bundles are continuously oriented, therefore the composites have superior mechanical properties. One of the features of the braided fabrics is capability of changing the braiding angle. Another feature is the fiber bundle called the middle-end fiber (MEF) can be inserted into the braiding fibers along the longitudinal direction. Therefore the mechanical properties of braided composite can be changed by selecting the type of fiber bundle both for the braiding fiber and MEF and changing the braiding angle. In addition, the various kinds of braiding fiber bundles and MEF with different properties can be used and hybrid braided composites to meet the requirement can be achieved. In this study, the effects of mechanical properties of MEF on the internal structure of the hybrid CF triaxial flat braided composites were investigated. Furthermore, considering the internal structure of braided composites, the numerical analysis using FEM was performed. Then, the guide for the design of the hybrid CF triaxial flat braided composites was provided.
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