Karl Kopelmann, Mathis Bruns, A. Nocke, M. Beitelschmidt, C. Cherif
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引用次数: 0
摘要
经编是一种生产力很高的纺织制造工艺,也是许多产品的首选方法。随着当前一代机器的运行速度达到4400 min - 1,动态成为生产的限制。导纱元件的共振效应和纱线的振荡导致负载峰值,导致断裂或不匹配。这限制了材料选择高弹性材料的高速,这弥补了这些影响,通过其固有的性质。为了加工高性能纤维,有必要更好地了解粘弹性纱线的性能。本文展示了一种利用动态力学分析方法在纱线纵向上实现这一目标的方法。对高强聚酯和芳纶样品进行了研究。在相似的几何条件、预载荷和发生频率方面,测试装置类似经编过程。通过记录由施加的应变引起的机械载荷,可以计算相移和耗散系数,这是阻尼行为的关键指标。结果表明,耗散系数随频率的升高而增大。结果允许经编过程的模拟,包括详细的纱线模型和针形过程的表示。
Characterization of the Viscoelastic Properties of Yarn Materials: Dynamic Mechanical Analysis in Longitudinal Direction
Warp knitting is a highly productive textile manufacturing process and method of choice for many products. With the current generation of machines running up to 4400 min−1, dynamics become a limit for the production. Resonance effects of yarn-guiding elements and oscillations of the yarn lead to load peaks, resulting in breakage or mismatches. This limits material choice to highly elastic materials for high speeds, which compensate for these effects through their intrinsic properties. To allow the processing of high-performance fibers, a better understanding of the viscoelastic yarn behavior is necessary. The present paper shows a method to achieve this in longitudinal yarn direction using a dynamic mechanical analysis approach. Samples of high tenacity polyester and aramid are investigated. The test setup resembles the warp knitting process in terms of similar geometrical conditions, pre-loads, and occurring frequencies. By recording the mechanical load resulting from an applied strain, it is possible to calculate the phase shift and the dissipation factor, which is a key indicator for the damping behavior. It shows that the dissipation factor rises with rising frequency. The results allow for a simulation of the warp knitting process, including a detailed yarn model and representation of stitch-formation process.