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首页> 外文期刊>The Journal of the Textile Institute >Research on mechanical properties of fibers at asymmetric ring spinning triangle using Finite Element Method
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Research on mechanical properties of fibers at asymmetric ring spinning triangle using Finite Element Method

机译：有限元法研究非对称环锭纺三角纤维的力学性能

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摘要

In the ring spinning process of staple yarn, spinning triangle is a critical zone, whose geometry influences the mechanical properties of fiber in the spinning triangle directly. In the practical spinning, especially in some modified ring spinning systems, the spinning triangle is often asymmetric, in which the horizontal deviation of the twisting point is existed and lead to an obvious angle between the yarn spinning tension and the vertical axis perpendicular to the nip line. Therefore, in this paper, the fiber tension distributions in this kind of asymmetric spinning triangle were studied using the finite element method. In the direct finite element model, the initial strain of fibers in the two sides of spinning triangle is asymmetric, and corresponding accidental fiber tensions would be produced, which makes the fiber move to the middle of the spinning triangle and lead to inaccurate results. Therefore, in the paper, one new finite element model of the asymmetric spinning triangle with left (right) horizontal deviation was presented for calculating the fiber tension. In the model, an asymmetric spinning triangle with the same right (left) horizontal deviation was used to combine with the original asymmetric spinning triangle, and one axisymmetric quadrangle was built, and the symmetry axis is the central fiber. Then, the fiber tension and torque distributions in the spinning triangles of Ne40 (14.6 tex) and Ne60 (9.7 tex) cotton spun yarn were numerical simulated with different horizontal deviations and twist factors. Furthermore, the accuracy of the proposed finite element model in calculating the fiber tensions was validated by comparing it with the theoretical model built by the energy approach.
机译：在短纤纱的环锭纺过程中，纺纱三角形是一个关键区域，其几何形状直接影响纺纱三角形中纤维的机械性能。在实际纺纱中，特别是在某些改进的环锭纺系统中，纺纱三角形通常是不对称的，其中存在加捻点的水平偏差，并导致纺纱张力与垂直于压区的垂直轴之间存在明显的角度线。因此，本文采用有限元方法研究了这种不对称纺丝三角中的纤维张力分布。在直接有限元模型中，纺丝三角两侧的纤维初始应变是不对称的，并且会产生相应的偶然纤维张力，这会使纤维移动到纺丝三角的中间并导致结果不准确。因此，在本文中，提出了一种新的具有左（右）水平偏差的不对称旋转三角形的有限元模型，用于计算纤维张力。在该模型中，使用具有相同的左右水平偏差的不对称旋转三角形与原始的不对称旋转三角形组合，并构建了一个轴对称四边形，并且对称轴为中心纤维。然后，对Ne40（14.6 tex）和Ne60（9.7 tex）棉纺纱的纺纱三角形中的纤维张力和转矩分布进行了数值模拟，模拟了不同的水平偏差和加捻因子。此外，通过将其与能量方法建立的理论模型进行比较，验证了所提出的有限元模型在计算纤维张力方面的准确性。

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