Abstract
In the present work, a 3-D unit cell model is proposed to predict the elastic behavior of 3-D full five-directional braided composites. The model is analyzed by extended finite element method. An effective medium approximation scheme is used to evaluate the elastic properties of the composite. In the proposed unit cell model, the interface between the fiber and matrix is modeled by PU enrichment. The effects of fiber volume fraction and interior angle of braiding yarn on the elastic properties are analyzed in detail. To further enhance the elastic properties, the braided composite is enforced by randomly distributed carbon nanotubes (CNTs). A new method is proposed to evaluate the effect of CNTs on the effective properties of the composite. The present simulations show that the addition of 3% CNTs increases the effective elastic properties of 3-D braided composite nearly by 100%.
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