2 research outputs found

    Elastic Behaviour Of Twisted Yarns

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    Twisted yarns are normally used for increasing the lateral cohesion of filaments and also for ease of handling. By twisting yarns, the micro-damages can be localised leading to possible increase in the failure strength of the yarns. In this paper, an analytical method is presented for predicting the elastic properties of twisted yarns. In the analysis, varying degree of twist in filaments at different radii of the yarn and possible migration and microbuckling are considered. The effect of twist angle and the extent of migration and microbuckling on elastic properties and the prestraining of the yarn is presented. KEYWORDS: Twisted yarn, elastic properties, varying twist, migration, microbuckling. NOTATIONS D : Diameter of the yarn D mig : Diameter corresponding to equivalent twist ` mig E; G; : Elastic properties h : pitch length of the idealised yarn h mb : P itch of the yarn after taking into account microbuckling I 1 ; : : : ; I 6 : Coefficients as explained in the text l : Leng..

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