Modeling the tensile property of cotton yarn

HUANG Cheng， WU Zhen-yu
（Faculty of Mechanical Engineering & Automation， Zhejiang Sci-Tech University， Hangzhou 310018， China）

Abstract： After analysis of the tensile property curve，yarns are born with creep，relaxation of stress phenomenon and non-lineal spring. In order to build the four-element model，the three-element model and the non-lineal spring were parallel connected. Based on the model features，yarn theoretical curve was built with the Taylor formula and orthogonal polynomial regression analysis were used. The LPC1768 single chip microcomputer was used to control the 57BYGH250C step motor exactly while the PCI1768 data acquisition card was used to acquire real time data in the experiment platform. 34.29 tex，45.45 tex and58.3 tex cotton yarns were used to do experiments，the experiment curves were gotten based on polynomial fitting. The results indicate that the theory curve is consistent with experiment curve（error ±5%）.
Key words： yarn model； tensile property； viscoelastic