[사] Analysis of Spun Yarn Failure. Part I: Tensile Failure of Yarns as a Function of Structure and Testing Parameters 출판일 : 2005.10.01 저자 : Anindya Ghosh, S. M. Ishtiaque, R. S. Rengasamy 서지사항 : Textile Research Journal, Volume 75, No.10, 731페이지 등록일 : 2012.02.09 I 조회수 : 78 작성자 : admin |
The phenomenon of spun yarn failure is strongly dependent on the yarn structure namely,
the configuration, alignment and packing of the constituent fibers in the yarn cross-section.
The structure of yarn is solely determined by the methods of consolidating the fibers into
yarns. In the present study, ring, rotor, air-jet and open-end friction spun yarns were
produced from identical fibers and their structural parameters; namely, mean fiber extent,
spinning-in-coefficient, helix angle of the fibers, percentage of different hooks and their
extents, number of fibers in yarn cross-section and yarn diameter were measured. These
yarns were subjected to uniaxial loading on the tensile testers with a large range of gauge
lengths (0 to 500 mm) and strain rates (5 to 400 m/min). The results showed that the
strength of yarns largely depends on the structure of the yarns, gauge lengths and strain
rates. A combined effect of fiber extent in the yarn and gauge length influences the yarn
strength. At high strain rates the yarn failure is dominated by the breakage of fibers rather
than the slippage of fibers. Furthermore, the analysis of the region of yarn failure provides
more direct evidences of the influence of yarn structure and testing parameters on the
strength of different spun yarns.
|