Effect of Fabric Structure and Weft Density on the Poisson's Ratio of Worsted Fabric

Abstract

This paper investigates the impacts of weave structures and weft density on the Poisson's ratio of worsted fabric under uniaxial extension. In this study nine groups of worsted fabrics comprising of three weave structures (twill 2/2, twill 3/1 and hopsack 2/2), each produced in three different weft densities were examined. Samples were extended in weft direction uniaxially and the Poisson's ratio of fabric in various extensions was measured. Analysis showed that the effect of both weft density and weave structure are significant with no combination effect on the Poisson's ratio. It was found that there is an exponential correlation between warp and weft crimp during fabric extension. For the worsted fabrics used in this research in all three fabric structures, fabrics with higher weft yarn density have higher value of Poisson's ratio. It was also concluded that for the fabrics with the same condition but only different in structures, this ratio is related to the structural firmness of fabric. In all three fabric structures the value of the Poisson's ratio were following the same pattern of twill 2/2, twill 3/1 and hopsack 2/2 from highest to lowest value. It was revealed that there is a high linear correlation between the crimp interchange ratio and Poisson's ratio.

Mechanical Behaviour of TRC Composites: Experimental and Analytical Approaches

“…greater role is attributed to the warp crimp, found to have almost a linear correlation with the fabric transverse deformation [28]. Within the group of fabrics investigated in this work, F7 was clearly the more affected, due to the higher AR-glass grammage and the significant yarn diameter in the warp direction (this effect is greater also with respect to Fabric F6 where, even though the warp grammage is identical, the crimp is lower due to the smaller spacing of warp yarns).…”

“…In Figure 21a, this effect is highlighted by the comparison between the composite and the fabric experimental curves. According to the literature, it can be stated that the "Poisson" effect is more significant in the case of unbalanced warp/weft fabrics [27], in terms of both equivalent diameter ratio and pick distances of the yarns; nevertheless, greater role is attributed to the warp crimp, found to have almost a linear correlation with the fabric transverse deformation [28]. Within the group of fabrics investigated in this work, F7 was clearly the more affected, due to the higher AR-glass grammage and the significant yarn diameter in the warp direction (this effect is greater also with respect to Fabric F6 where, even though the warp grammage is identical, the crimp is lower due to the smaller spacing of warp yarns).…”

Thermomechanical characterization of basalt fiber reinforced biodegradable polymers

“…As it mentioned in refs. , Poisson's effect in a woven fabric arises from the interaction between the warp and weft yarns, the direction with higher yarn density attains higher Poisson's ratio. In our case, we are studying polymer composites reinforced with a fabric, with a symmetry between warp and weft density.…”

A new method for determination of Poisson’s ratio of woven fabric at higher stresses

“…This property is important for many engineering applications and computer simulations, and has been studied in many researches. [1][2][3][4][5][6][7][8][9] The problem of determining Poisson's fabric ratio is the subject of many researches. In 1963, Kilby had developed a simple grid model and studied the strain/stretch ratio where he observed the correlation between the Poisson's coefficient, shear modules, and elastic fabric modules.…”