被服材料の力学的性能に関する研究

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タイトル別名
  • Mechanical Properties of Fabrics
  • ヒフク ザイリョウ ノ リキガクテキ セイノウ ニ カンスル ケンキュウ 5 ヒラオリモノ ノ オウリョク カンワ トクセイ ニ カンスル リロンテキ カイセキ
  • Part 5: Theoretical Analysis on Stress-Relaxation Properties of Plain Woven Fabrics
  • (第5報) 平織物の応力緩和特性に関する理論的解析

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Stress-relaxation properties in uni-axial and bi-axial extension of plain woven fabrics are introduced theoretically from yarn properties and fabric structure.<BR>In uni-axial deformation, stress-relaxation properties of fabrics are calculable by the relaxation properties of tensile directional yarn and parameter function Fc.<BR>The stress-relaxation properties of plain woven fabrics are expressible thus;<BR>F(t)-FT(t)sinθ(1)<BR>or<BR>F(t)=I/2 Fc(t)tanθ(t)<BR>where<BR>F(t): Fabric stress-relaxation property.<BR>FT(t): Yarn stress-relaxation property.<BR>θ(t): Time dependency of axis angle of tensile directional yarn after given deformation.<BR>Fc(t): Relaxation properties of parameter function Fc.<BR>When viscoelastic properties of tensile directional yarn, e.g., warp, are roughly equal to the property of weft yarn, the time dependency of the fabric structure is very slight in deformed state of the fabric and the relaxation property of fabric is the same as the property of warp yarn.<BR>When there is a major difference in viscoelastic properties between warp and weft yarns, the time dependency of the fabric structure is caused by this difference and the relaxation property of the fabric is affected by this structure change.<BR>This process can be calculated by graphycal method.<BR>The stress-relaxation properties of some fabrics are calculated by this theory. The relaxation properties of fabrics are measured in uni-axial extension deformation. The results of the calculation and measurement are compared and discussed. The theoretical and experimental results agree well.<BR>An application of this theory is to estimate the change of mechanical property of cloth caused by moisture absorption during wearing.

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