Abstract
THE normally accepted coaxial helix model of the geometrical structure of a continuous filament textile yarn1 is such that rupture of the yarn would be expected to commence at its centre, where the filaments are aligned parallel with the yarn axis. Hearle and Thakur2 have shown for short lengths of yarn extended at low strain rates that breakage of the yarn begins at a point away from the yarn centre. They concluded that this type of rupture would be expected if the centre filaments of the yarn were buckled in the unstrained state. This explanation, however, ignores any alteration in filament breaking extension which may be associated with the transverse stresses exerted by the surrounding filaments. These stresses have been shown3,4 to modify considerably the stress distribution in rubber filaments which form a twisted structure of the type described here. Some results which I have obtained recently on the breaking extensions of nylon monofilaments subjected to a combined axial stress and transverse compressive stress show that their extensions at break are changed under these conditions.
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References
Platt, M. M., Test. Res. J., 20, 1 (1950).
Hearle, J. W. S., and Thakur, V. M., J. Text. Inst., 52, T, 49 (1961).
Wilson, N., Brit. J. App. Phys., 13, 323 (1962).
Treloar, L. R. G., Brit. J. App. Phys., 13, 314 (1962).
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WILSON, N. Breaking Extension of Nylon Filaments under Combined Axial and Transverse Stresses. Nature 198, 474 (1963). https://doi.org/10.1038/198474a0
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DOI: https://doi.org/10.1038/198474a0
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