Viscoelastic Modeling of Yarn for Tufting Carpet

Abstract

The viscoelastic properties of polypropylene yarn, used to analyze the stress-strain behavior are characterized in this study. Since the yarn is subjected to dynamic tension and friction during the tufting process, the various mechanical properties are important parameters. In this article, the normal linear solid model and the nonlinear model consisting of spring and dashpot were presented to model the tensile and stress-relaxation response of polypropylene carpet yarn. Then, the experimental data were fitted with the two models to obtain the parameters by applying least square fitting. The result suggests that the standard linear model provided the best fit for the experimental data of the tensile and stress-strain behavior of yarn. The material model can be employed into analysis of vibration characteristic of yarn in tufting carpet process.