Technological Development of a Yarn Grip System for High-Speed Tensile Testing of High-Performance Fibers
Technological Development of a Yarn Grip System for High-Speed Tensile Testing of High-Performance Fibers
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DOI：
10.2478/aut-2019-0014
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发表时间：
2019-12
影响因子：
1.1
通讯作者：
R. Unger;P. Schegner;A. Nocke;C. Cherif
中科院分区：
文献类型：
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作者：
R. Unger;P. Schegner;A. Nocke;C. Cherif
特别是碳纤维（CF）粗纱和其他高性能纤维，由于其对剪切应力的敏感性，在高速拉伸试验中夹紧低伸长的技术纱线是一项要求很高的任务。对于要测试的纤维，低断裂伸长率可以缩短测试时间，并且需要高加速度。本文将介绍四种不同的纱线夹头，它们可以应用于不同的测试机器，并与楔形螺纹夹头进行比较。通过使用最敏感的CF粗纱，这些夹持装置的优点和缺点将分别通过测试速度高达20 m/s和应变速率高达200 s−1的测试机器进行定性评估。因此，通过优化纱线握把的几何形状和质量，大大提高了测试结果的再现性和精度。此外，将介绍适合测试速度高达100米/秒的纱夹设计的理论方法和计算。
Abstract Particularly in terms of carbon fiber (CF) rovings and further high performance fibers, it is a highly demanding task to clamp technical yarns with low elongations at break during high-speed tensile tests due to their sensitivity to shear stress. For fibers to be tested, a low elongation at break results in short testing times and requires high acceleration. In this paper, four different yarn grips that can be applied with various test machines will be introduced and compared to a wedge screw grip. By using most sensitive CF rovings, advantages and disadvantages of these gripping devices will be qualitatively evaluated by means of testing machines with test speeds of up to 20 m/s and strain rates of up to 200 s−1, respectively. Hence, the reproducibility and precision of test results were considerably enhanced by optimizing the geometry and mass of yarn grips. Moreover, theoretical approaches and calculations for the design of yarn grips suitable for test speeds of up to 100 m/s will be presented.