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Tensile Properties and Static Fatigue Behavior of Cotton Warp Yarns

机译:棉经纱的拉伸性能和静态疲劳行为

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Warp yarns under a state of dynamic loading on a loom have to withstand cumulative damage caused by tensile fatigue at relatively low loads coupled with the abrasive action of the machine parts. To evaluate the fatigue phenomenon of sized cotton yarns and its correlation with performance on a loom, one must first understand basic mechanical properties of yarns in terms of fiber properties and fiber length distribution. The first section of this paper reports on the effect of fiber length distribution on tensile properties of yarns at various tensile strain rates, and the second section presents the fatigue behavior of 100% cotton yarns. Fiber length and its distribution in cotton yarns seem to influence the tensile behavior of both sized and unsized yarns at all strain rates, but strain rates do not play a significant role in determining the properties of sized yarns. Adding size tends to mask the effect of fiber length variation, particularly at higher size loading. The tensile properties of sized cotton yarns are also influenced by the size type, such as polyester, carboxymethyl cellulose, and polyvinyl alcohol, at all add-on levels. The fatigue behavior of 100% cotton unsized and sized yarn is evaluated using a Sulzer-Ruti Webtester. The mechanism of yarn failure due to fatigue/ abrasion for unsized yarn is affected by short fiber content. The base tension has the largest overall effect. Unsized yarn containing 10% comber noil has an optimum balance of short and long fibers, making the yarn structure more resistant to fatigue/ abrasion. In sized yarn, the effect of short fibers is partly masked by the properties and compatibility of size materials with the substrate. Polyester size has poor compatibility with cotton fibers; carboxymethyl cellulose and partially hydrolyzed polyvinyl alcohol tend to produce very highly increased resistance to fatigue and abrasion. Representing fatigue/abrasion data in terms of mean or average lifetimes is questionable due to contradictory evidence. Representing fatigue data in terms of a three-parameter Weibull distribution leads to realistic interpretations.
机译:在织机上承受动态载荷的状态下,经纱必须承受相对较低载荷下的拉伸疲劳以及机器部件的磨蚀作用所引起的累积损坏。为了评估棉纱的疲劳现象及其与织机性能的相关性,必须首先从纤维特性和纤维长度分布方面了解纱线的基本机械性能。本文的第一部分报告了在不同的拉伸应变速率下纤维长度分布对纱线拉伸性能的影响,第二部分介绍了100%棉纱的疲劳行为。纤维长度及其在棉纱中的分布似乎在所有应变率下都会影响上浆纱和未上浆纱的拉伸性能,但应变率在确定上浆纱的性能方面没有重要作用。增加尺寸往往会掩盖纤维长度变化的影响,特别是在较高尺寸的负载下。在所有附加含量下,上浆棉纱的拉伸性能也受上浆类型的影响,例如聚酯,羧甲基纤维素和聚乙烯醇。使用Sulzer-Ruti Webtester评估100%棉上浆和上浆纱的疲劳性能。短纤维含量会影响不定尺寸纱线因疲劳/磨损而导致的纱线破坏机理。基本张力具有最大的总体效果。含10%精梳罗纹的未上浆纱具有长短纤维的最佳平衡,使纱线结构更耐疲劳/磨损。在上浆纱中,短纤维的作用部分被上浆材料与基材的性能和相容性所掩盖。聚酯浆料与棉纤维的相容性差;羧甲基纤维素和部分水解的聚乙烯醇往往会产生非常高的抗疲劳性和耐磨性。由于矛盾的证据,用平均寿命或平均寿命来表示疲劳/磨损数据是有问题的。用三参数威布尔分布来表示疲劳数据可得出现实的解释。

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