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題 名 | 紗線彎曲剛性與大撓曲角度的分析=The Analysis for Large Deflection in Flexural Rigidity of Yarns |
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作 者 | 黃慶堂; | 書刊名 | 紡織中心期刊 |
卷 期 | 13:1 2003.01[民92.01] |
頁 次 | 頁49-58 |
分類號 | 478.11 |
關鍵詞 | 彎曲剛性; 柔軟度; 機械力學; 大變形; 非線性; 異斷面; 中性軸; Flexural rigidity; Softness; Mechanics of materials; Large deformation; Nonlinearity; Noncircular cross-section; Neutral axis; |
語 文 | 中文(Chinese) |
中文摘要 | 纖維及紗線的彎曲剛性對於成品布的柔軟度、觸感等性質有決定性的影響,對於未來虛擬數位織物的成敗更是重要,然而紡織中對於紗線或纖維彎曲剛性的分析一向沿用材料力學之小變形的線性模式,除了在計算彎曲角度時,精準度常受質疑外,在對彎曲剛性的判斷上,也常因此忽略很多特性而導散結果不甚理想。此外紡織中常用的彎曲剛性表示式中引入形狀係數以求對不同原料有相同的描述方式,但對於目前各種同質或異質但不同異斷面纖維難以作明確的說明。本文由材料力學的觀點出發,先進行彎曲剛性極小撓曲角度的推導,並描述紡織中對彎曲剛性的說法,其次論及大撓曲角度變形剛性分析中不可或缺的非線性項。最後探討各種不同材質、不同斷面及中性軸下的彎曲剛性,主要在於面積二次矩的變化造成彎曲剛性的變化、並說明足以影響結果的基本設定及實用上的一些必然結果。 |
英文摘要 | The softness, touch and other properties of fabrics are coming from the flexural rigidity of the yams or fibers. Usually, we use the linearization model for small angle deformation in mechanics of materials to describe the deflection angles and flexural rigidity, which is not exact. In textile industry, in order to express the flexural rigidity in the same model for different raw materials, the shape factor is used. Today, different cross-sections is popular, even the composite material also, the shape factor cannot work clearly in this situation. In this essay, we describe the definition of flexural rigidity from the view of mechanics of materials, and explain the description in textile for flexural rigidity at first. Secondly, the nonlinear terms which is necessary for large deformation and flexural rigidity is considered. At the last, we discuss the flexural rigidity for different materials, linear density, and neutral axis. The assumptions that affect the results and some of the invertible facts will be mentioned. |
本系統中英文摘要資訊取自各篇刊載內容。