Mechanical Properties of Textile Fibers:Part 3 : Longitudinal Stress and Strain and Lateral Strain

概要

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The decrease of the cross-sectional area due to the longitudinal extention of textile fibers was observed and Poisson's ratio was caluculated. At the same time, tensile load was observed and the strict stress-strain diagram was also calculated. The following results were obtained : 1. Poisson's ratio of monofilament yarn is caluculated as 0.30 ∼ 0.41 for nylon, 0.21 ∼ 0.31 for polyvinyl chloride and 0.33 ∼ 0.37 for polyethylene. 2. In nylon and polyethylene, Poisson's ratio is larger at the beginning of extention than at the high extention. In polyvinyl chrolide, the ratio is rather small at the beginning. 3. The strict stress-strain diagram is relatively straightened when compared with the usual load elongation diagram. 4. Young's logarithmic modulus, rather than the usual Young modulus, can be recommended as the constant of the elastic quantity of textile fibers up to the high extention.
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