[사] Uniaxial Tensile Properties of Yarns: Effects of Moisture Level on the Shape of Stress-Strain Curves 출판일 : 2004.11.01 저자 : O. Ahumada, M. Cocca, G. Gentile, E. Martuscelli, and L. D'Orazio 서지사항 : Textile Research Journal, Volume 74, Issue 11, 1001페이지 등록일 : 2012.10.25 I 조회수 : 67 작성자 : admin |
With the aim of clarifying the complex shapes of the stress-strain curves of yams such as
wool and silk and improving the reproducibility of the experimental results achieved through
their mechanical characterization, nylon 6,6 yams consisting of one, three, nine, and thirty
filaments are selected as a modeling system. Moreover, the uniaxial tensile properties of
commercial nylon 6,6 yarns are investigated and compared with the corre sponding
properties of commercial wool and silk yarns. Moisture level plays a very relevant role in
determining the mechanical behavior of yarns. With an increasing moisture level of
conditioning, in fact, nylon 6,6, wool, and silk yarns show neat breaking points, and their
stress-strain curves tend to assume the typical shape of the curve shown by respective
single fibres. This suggests that high moisture levels minimize the multiple breakage
phenomena occurring in the yam. Moreover, for all the yarns investigated and, in particular,
for wool, the process of conditioning at 100% RH reduces the variability of the experimental
results, thus inducing a significant improvement in the precision and reproducibility of
uniaxial tensile tests.
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