[사] Variation of Longitudinal Modulus with Twist for Yarns Composed of High Modulus Fibers 출판일 : 2001.10.01 저자 : Masatoshi Shioya, Toyoki Itoh, Toshiaki Kunugi, Akira Takaku 서지사항 : Textile Research Journal, Volume 71, No 10 (2001), 928-936 페이지 등록일 : 2012.08.20 I 조회수 : 88 작성자 : admin |
Variations of longitudinal and transverse moduli with twist for twisted yarns and twisted
yarn-resin composite strands composed of fibers covering a wide range of tensile moduli
are investigated using a sonic pulse propagation method. For twisted yarns composed of
fibers relatively low in tensile modulus, the longitudinal modulus decreases with increasing
twist in accordance with the cos2α model. For twisted yarns composed of high modulus
fibers such as aramid and carbon, however, the reduction of the longitudinal modulus with
twist is abrupt, and deviates largely from the prediction of the cos2α model. The relationship
between the longitudinal modulus of twisted yarns and the twist angle is derived on the
basis of a model that takes into account the anisotropic elasticity of the filaments. The
analytical results of the proposed model are quantitatively consistent with the experimental
results for various twisted yarns and twisted yarn-resin composite strands.
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