on-crimp three-dimensional orthogonal woven fabrics are high-tech textiles in aerospace composite reinforcement. The fabric arrangement in three main directions cause composites that reinforced with these textiles have highly resistant to mechanical stresses and thermal stresses. Due to the difficulty of performing some mechanical experiments on these structure, torsional properties of composite rod reinforced by non-crimp three-dimensional orthogonal woven fabric has not been analysed in detail. So in this study attempts to produce three different 3D weave samples using glass yarn, two different orthogonal weavs in terms of binder yarns insertion density and one 3D braid with glass yarn as cord are produced, and a comprehensive study on the torsional behavior of glass/epoxy composite reinforcements is conducted. The findings revealed that high-density non-crimp three dimensional orthogonal composite with high thread density due to square cross-section and perpendicular fiber involvement in all directions and higher density has better torsional properties in comparison to other composite samples. Then by using the finite element model compare the result of the experimental emitter, which shows that the model can predict the torsional properties of non-crimp three dimensional orthogonal composites.
