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題名 | 複合材料自行車曲柄之設計與製作=Design and Manufacturing of a Laminated Composite Bicycle Crank |
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作 者 | 張瑞榮; 戴文正; 吳豐宇; 夏盛洋; 鐔孝明; | 書刊名 | 中華科技大學學報 |
卷期 | 55 2013.04[民102.04] |
頁次 | 頁25-44 |
分類號 | 447.187 |
關鍵詞 | 複合材料碳纖纖補強自行車曲柄; 主體長纖維層; 短纖糰料塊狀; 補強纖維層; 三明治層; 最佳化設計; Composite bicycle crank; Main long fiber; Short fiber; Reinforcing layer Bulk molding compound; Sandwich; Optimum design; |
語文 | 中文(Chinese) |
中文摘要 | 本研究特別是指一種具有複合材料碳纖纖補強自行車曲柄的設計與製程技術有關,其中複合材料包括主體長纖維層、短纖材料及補強纖維層,而短纖材料是糰料塊狀(Bulk Molding Compound),主要由一英吋長碳纖維之短纖材料與環氧樹脂攪拌混合而成。自行車曲柄本體以複合材料取代傳統金屬材料之大部分重量與強度,同時利用傳統金屬材料之特性,例如耐磨耗、衝擊等特點,有效結合同質或異質材料,達到最佳結合之設計目的。本研究也提供一種自行車曲柄的製法與製程,利用短纖糰料模壓成型法,將長、短纖維層三明治層複合材料與金屬材料組件,經上、下模具熱壓成型製成該曲柄本體,而大大減輕曲柄之重量,同時利用至少一個金屬介面環組件,內壁設有預定四方柱面形狀之開口或螺紋以便與軸或其它元件套接或螺接,外壁則設有與複合材料嵌合之高摩擦表面溝道結構,使得達到異質材料結合及減輕重量之目的。最後利用有限單元及最佳化設計原理模式,尋求多重起始點總域性最佳化纖維排列角度,並比較無補強主體纖維層與具有補強纖維層之實驗強度比較,基於材料特性及邊界條件建立合適可靠實驗量測模擬分析及最佳化設計。 |
英文摘要 | This paper presents the design and manufacturing process of a c laminated composite bicycle crank. Bulk moulding compound (B.M.C.) was manufactured by mixing strands (>1”) of chopped carbon fibers in a mixer with polyester resin. The crank body was designed as a cantilever sandwich composite structure made up of long and short fiber (B.M.C.) layers. The composite material was hot pressed and manufactured into crank body to reduce most of its weight. In the manufacturing process, the long and short fiber layers were joined together by a metal interface ring. The body is a sandwich structure, where the interior is a short fiber sandwich layer while the exterior is coated with a main long fiber layer and an inner reinforcing layer near the metal ring of the crank. Its characteristics include base composite material, interface ring, internal wall of square prism surface and exterior projected rib. The inner reinforcing layer provides the maximum bending resistance and reduces the stress concentration of the head-to-crank attachment. The FEM model was then calibrated on the basis of the constituent material characterization and the definition of suitable boundary conditions in order to achieve a reliable simulation of the experimental tests and optimum design. Several designs of composite cranks were given to demonstrate the feasibility and applications of the proposed method. |
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