Investigation of warp and weft take-up influence on Poisson‘s ratio of woven fabric

Abstract

Due to the anisotropy of woven fabrics Poisson‘s ratio changes over the fabric sample stretching. This paper examines the impact of the weft density on the value of the Poisson‘s ratio when uniaxial tensile force acts on the woven fabric. Measurements of breaking force and breaking elongation were carried out on five samples of cotton woven fabric with a constant warp density and different weft densities with the same structural plain weave. Samples are stretched with tensile force in the weft and warp direction, and based on different measured values of fabric stretching, warp and weft Poisson‘s ratio is calculated. Investigations which are presented in this paper have shown that warp and weft take-up, and relative stretching of fabrics have a significant impact on the Poisson‘s ratio. By increasing the weft density, the values of Poisson‘s ratio for all fabrics are also increased. Results of the implemented tests show that there is a high correlation between the take-up ratio and Poisson‘s ratio of woven fabrics.