Distributions of radial Young's moduli were estimated by pushing the side faces of two kinds of yarn packages One is made by twisted polyester yarn, the other is nylon-6 yarn package
The method of measuring radial Young's modulus is deduced from the relation between load acting on package and displacement of screw in package, for various yarn layer thicknesses and winding tensions
1) Compression load (P) acting on nylon-6 yarn package is linear to displacement (U).
2) Radial Young's modulus for polyester twisted yarn package is increased for the package formed under constant winding tension, and radial Young's modulus is constant for the package formed under controlled winding tension
3) Radial Young's modulus for the nylon-6 yarn package is linear to winding tension.
These results show the necessity of the distribution of radial Young's modulus inyarn package in the stress-strain distribution
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