6—THE MECHANICS OF TWISTED YARNS : TENSILE PROPERTIES OF CONTINUOUS-FILAMENT YARNS

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Abstract
The theories ofthe extension of yarns which have been proposed by Gegauff1 Platt 2,3, and Hearle4 and the assumptions on which they are based are considered. Experimental studies of the tensile properties of twisted continuous-filament yarns are reviewed. A range of yarns has been twisted, and their tensile properties determined. Reasons for the variation of stress-strain curves, modulus, limit of proportionality, breaking extension, and tenacity are discussed, and the results compared with theoretical predictions. The effects of processing conditions, and deviations of yarn structure from an idealized model are also mentioned.