Nanofiber yarns with twisted and continuous structures have potential applications in fabrication of complicated structures such as surgical suture yarns, artificial blood vessels, and tissue scaffolds. The objective of this article is to characterize the tensile fatigue behavior of continuous Polyamide 66 (PA66) nanofiber yarns produced by electrospinning with three different twist levels. Morphology and tensile properties of yarns were obtained under static tensile loading and after fatigue loading. Results showed that tensile properties and yarn diameter were dependent on the twist level. Yarns had nonlinear time independent stress-strain behavior under the monotonic loading rates between 10 and 50 mm/min. Applying cyclic loading also positively affected the tensile properties of nanofiber yarns and changed their stress-strain behavior. Fatigue loading increased the crystallinity and alignment of nanofibers within the yarn structure, which could be interpreted as improved tensile strength and elastic modulus. (C) 2014 Society of Plastics Engineers
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机译：具有扭曲和连续结构的纳米纤维纱在制造复杂结构（如外科缝合线，人造血管和组织支架）中具有潜在的应用前景。本文的目的是表征通过电纺三种不同捻度的连续聚酰胺66（PA66）纳米纤维纱的拉伸疲劳性能。在静态拉伸载荷下和疲劳载荷之后获得纱线的形态和拉伸性能。结果表明，拉伸性能和纱线直径取决于捻度。在10至50 mm / min的单调加载速率下，纱线具有非线性的时间无关应力-应变行为。施加周期性载荷也对纳米纤维纱的拉伸性能产生积极影响，并改变了它们的应力应变行为。疲劳载荷增加了纱线结构内纳米纤维的结晶度和排列，这可以解释为拉伸强度和弹性模量的提高。 （C）2014年塑料工程师学会
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