Multiaxial fabrics are the most important category of technical textiles because of spatial mechanical property, good flexibility and high production rate which make them significant in various common weaving. According to recent investigations, numerous applications of multiaxial fabrics include composite materials, construction, sports equipment, aerospace, military, automotive and shipbuilding. Considerable improvements in research and production process of multiaxial fabrics showed that these fabrics are important due to increasing added value also gaining new technologies in resistant textiles and industrial composites. Because of sufficient application and noncrimp structure, in this project, the mentioned fabrics are discussed here as a new technique to production of multiaxial fabrics. In the first step, the feasibility study for manufacturing multiaxial machine has discussed. Ultimately, we use the parts of a sewing machine to make alterations in tufting machine. The multiaxial fabrics are produced using standard methods and high strength nylon filament yarn by design and construction of special frame. The uniaxial tensile tests were performed on specimens and the tensile behaviors of multiaxial fabrics were analyzed using data obtained from the uniaxial tensile tests. Finally data were investigated by statistical methods. Results demonstrate that there is no significant difference between the mean of maximum and the minimum levels of strength. This may be due to the stitching direction positioned perpendicular to the set yarns. A theoretical equation used in order to investigate the tensile behavior of multiaxial fabrics in yarns aligned in a direction which differ from other directions of layers. However, results obtained from this equation were not consistent with experimental data. Also these results suggested that the multiaxial fabrics in different directions do not have equal strength, so the fabric do not display complete isotropic behavior and has sufficed tensile strength just with layers of yarn. Keywords : technical textiles, multiaxial fabrics, tufting, uniaxial tensile strength, layup process.
