Stress-analysis methods for textile materials are illustrated through a study of the forces pro duced when a continuous-filament yarn is stressed in tension. It is shown that the effects of yarn twist and yarn size on the tensile properties of singles continuous-filament yarns depend upon the stress distribution. Mathematical formulas are derived to express variations in tensile character istics, both for one-time loading to rupture and repeated stress, as a function of yarn geometry. The influence of fiber inherent properties is described and illustrated by experimental data ob tained for viscose rayon, acetate rayon, and nylon of various singles geometry.
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