织机棉纱蠕变试验及蠕变特性数值仿真分析的应用

Application of Loom Cotton Yarn Creep Test and Numerical Simulation Analysis of Creep Property

纱线的粘弹特性对织机停机后重新开机时的织口位置具有重要影响,为减小该影响,采用棉纱作为实验对象,在纱线强力仪上进行蠕变试验。运用Burgers四元件模型的本构关系建立蠕变理论方程,利用Matlab拟合蠕变试验结果,计算粘弹性参数。同时还用ANSYS对棉纱进行蠕变特性数值仿真计算,结果显示:仿真结果与试验结果拟合精度很高。可把织口向机后拉动来平衡织口移动量,使织口恢复到正常开机时的位置,为解决重新开机后织物停车挡的问题提供理论支持。

The viscoelastic behavior of yarn has an important influence on the cloth-fell position when the loom restarts after shutdown.To reduce this influence,this paper uses cotton yarn as the experimental subject and conducts creep test on yarn strength tester;establishes creep theoretical equation with the constitutive relation of Burgers four-element model and calculates viscoelasticity parameter with matlab fitting creep test result;and meanwhile conducts numerical simulation calculation of creep property for cotton yarn by using ANSYS.The result shows that the simulation result and test result have a high fitting precision.The cloth-fell can be pulled backwards to balance cloth-fell movement amount and make cloth-fell recover to the position in normal startup.This provides theoretical support for solving the problem of fabric parking structure after restart.