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題名 | 轉注成型充填過程中氣孔在纖維蓆分布情形之研究=Study on Void Distribution in the Fiber Mats during the Filling Stage of RTM |
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作者 | 張智淵; | 書刊名 | 高苑學報 |
卷期 | 8 2002.07[民91.07] |
頁次 | 頁19-40 |
分類號 | 467.4 |
關鍵詞 | 轉注成型; 多相達西定律; 不飽和多孔性介質流; RTM; Multiphase darcy's law; Unsaturated flow; |
語文 | 中文(Chinese) |
中文摘要 | 在RTM充填過程,纖維席被預置於模空內,接著注入樹脂並驅離纖維蓆孔隙中空氣。但因纖維席局部微觀結構差異及隨機微小擾動,使得有部皆空氣殘留於孔隙內,進而與樹脂一起流動。因此,本研究以準穩態多相達西定律來模擬纖維內的不飽和流場及氣孔分布情形。模擬結果顯示:在充填時氣孔多分布於流動面附近,若持續充填時間,則氣孔將消失。氣孔將消失。氣孔分布範圍大小與纖維空孔度、入射條件有關,端點效應會發生在主流場與燭心流交界處。 |
英文摘要 | In RTM mold filling, the dry fiber mats are replaced in the mold cavity and resin is then injected into closed mold. The resin displaces air that initially occupies the pores in the fiber mats. Owing to the random nature of the microscopic porous structure, air is trapped in the pores. Subsequently, resin and trapped air advance simultaneously through the porous medium. Multiphase Darcy's law is used to simulate the unsaturated flow and the void distribution. The results show that the voids form in the wicking flow field and the voids will be removed as the resin is continuously filled time. The range of void distribution is dependent on the porosity of fiber mats and inlet boundary conditions. The end effect occurs near the interface between the primary flow and wicking flow. |
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