The Impact of Fabric Weave and Anisotropy on the Poisson’s Ratio in Technical Fabrics

Abstract

: Poisson’s ratio changes during the tensile stress of technical fabric samples due to the anisotropy of technical fabrics. This paper examines the effects of the type of weave and the anisotropic characteristics of the technical fabric on maximum tensile force, corresponding elongation, work-to-maximum force, elasticity modulus, and Poisson’s ratio when axial tensile forces are applied to samples cut at various angles in the direction of the weft yarns of the technical fabric. In the lab, 3 cotton fabric samples of constant warp and weft density with different structural weave types (plain weave, twill weave, atlas weave) were subjected to the tensile force until they broke at the following angles: 0°, 15°, 30°, 45°, 60°, 75°, 90°. Based on the different measured values of technical fabric stretching in the longitudinal direction and lateral narrowing, Poisson’s ratio is calculated. The Poisson’s ratio was calculated up to a relative elongation of the fabric of 8%, as the buckling of the fabric occurs according to this elongation value. According to the results presented in this paper, the type of weave of the fabric, the direction of tensile force, and the relative narrowing of the technical fabrics all play important roles in the Poisson’s ratio value. The Poisson’s ratio curve of a technical fabric under tensile stress (i.e. elongation) is primarily determined by its behaviour in the opposite direction of the elongation. The change in the value of the Poisson’s ratio is represented by a graph that first increases nonlinearly and then decreases after reaching its maximum value.