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頁籤選單縮合
題名 | Damage Evolution in 3-D Woven Composites Incorporating Solid Rods=以硬桿補強三次元梭織複合材料之破損行為 |
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作者 | 郭文雄; 李林泉; | 書刊名 | 逢甲學報 |
卷期 | 33 1998.06[民87.06] |
頁次 | 頁57-71 |
分類號 | 440.2 |
關鍵詞 | 三次元編織; 拉擠成型; 破損行為; 3D fabric; Pultrusion; Damage behavior; |
語文 | 英文(English) |
中文摘要 | 本文旨在以拉擠桿來補強三軸式的 3D 編織複合材料,並討論此類材料的物性。 材料製造分成三大步驟, 首先是以拉擠法製造 1mm 直徑的單向圓桿,其次是利用拉擠桿為 軸向來編織三次元的預成形物,為了將拉擠桿加入,編織機臺部份必須重新設計,最後是以 RTM 的技術將樹脂加入織物之中,並且加熱硬化。以硬桿來取代傳統織物中的軸向紗,目的 在使纖維能保持直線。傳統的 3D 編織機臺必須重新設計,以配合硬桿的特性。本研究中製 造了一系列的試片,分別改變了捲曲距離與編織紗的大小,而所造成的影響,也加以分析。 和一般傳統的三次元織造法來比較本法幾乎完全消除紗線彎曲的問題,且大幅提昇織物結構 的一致性。彎曲、短樑及衝擊試驗也分別地執行,而所引起的破壞行為也以顯微鏡加以研究 。其中我們發現有一特殊的破壞機構為硬桿拉入或推出試片表面,這在短樑試驗中尤其明顯 ,這種現象只有在使用桿子時才會發生,因為桿子直徑固定才允許桿子的滑動。我們發現交 織圈直接影響破壞的模式,交織圈同時可提供固定及保護桿子的功用,能量吸收與破壞機構 加以觀察與探討。 |
英文摘要 | This paper is aimed at elucidating the processing-property relationships of composites through experimental characterization. The fabrication processes involve three primary steps: pultrusion of 1-mm diameter unidirectional rods, formation of 3-D preforms incorporating the rods, and impregnation of the resin into the preforms. The use of the rods is intended to address crimp problems often seen in textile composites. A modified three-axis weaving setup to incorporate the rods has been developed. Three types of three-dimensional woven fabrics have been made with the solid rods incorporated in the axial direction. A series of specimens with varying bundle size and fabric type has been made to investigate their respective influence. In comparison with conventional textile composites, the axial yarns are straight and are packed in a rather dense and orderly manner. The material characterization has been carried out based upon flexure and short beam tests. Damage configurations and evolving nature for each loading case have been examined. Unique features include pull-in and push-out of the rods, which are the dominant modes in the short beam tests. Dominant damage modes associated with the use of the rods have been identified and correlated with the fabric structures. The surface loops have been found critical in the development of transverse cracks. The energy absorbing mechanisms of the present materials have been discussed. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。