Abstract:

In order to study on the reincarnation properties of PU-coated multi-axial warp knitted fabric, five directions with 0°, 22.5°, 45°, 67.5° and 90° of this material were cut for uniaxial tension experiment. The tensile curves and the elastic modulus were analyzed. The deformation behaviors were observed and Poisson’s ratios were calculated by utilizing the digital image correlation (DIC) system. Lastly, orthotropic model was used to predict the elastic modulus and Poisson’s ratio in 22.5° and 67.5° directions. It is found that this coated fabric has a great elongation with more than 400% in five directions. And the closer to 67.5° is,  the greater of the elastic modulus is. At the beginning of tensile, it can be obtained by the DIC system that the transverse shrink deformations are inhomogeneous, it shrink faster in the center but slower at the edge of the specimens, but the longitudinal tensile deformation is relatively uniform. There is a good prediction of the initial modulus and Poisson’s ratio by using orthotropic model, and the absolute error value is less than 23.69%.

Key words: multi-axial warp knitted, coated fabric, fensile property, orthotropic anisotropy