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Finite element prediction of elastic properties of three dimensional and four directional braided composites

Li Diansen Lu Zixing Lin Xiaoming Lu Wenshu(School of Aeronautic Science and Technology,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)  
A new finite element solid model was established based on the unit cell model of 4-step rectangular three-dimensional braided composites and the assumption of the yarns with the hexagonal cross-section.The surface of model is parallel to the surface of perform,which coincides with the actual configuration of 3D braiding composites and is suitable for the analysis of the mechanical properties.The model also considered the relationship between braiding angle and internal braiding angle.Based on the model,the elastic constants of material were calculated by the ANSYS software and the numerical results showed good agreement with the experiment results.The influences of the braiding angle and fiber volume fraction on the elastic constants were also analyzed.The stress field of composites was determined,which provided a basis for the strength prediction.
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