Abstract
The effect of twist on some mechanical properties of three single continuous-filament yarns of glass fiber were investigated, observing the stress-strain curves, yarn diameter and retraction.The stress-strain curve of the twisted glass yarns was a simple straight form; the tensile strength of each yarn decreased gradually with twist and could be expressed by Platt's equation. The breaking extension was almost constant except strong twisted region. Increasing the twist at the constant loading, the yarn diameter decreased first and after the certain twist it retained the constant value.The retraction and breaking twist angle were not affected by the fineness of the filament and the sizing materials on the glass filament surface; they were only dependent on the yarn diameter.
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