臺灣博碩士論文加值系統

本研究使用有限元素法套裝軟體ABAQUS，針對軌道絕緣接頭進行數值模擬分析。首先，建立包含鋼軌、魚尾鈑、環氧樹脂、螺栓、螺栓絕緣套筒、鋼軌間絕緣片及枕木等之數值分析模型，使絕緣接頭承受一垂直集中載重以模擬列車重量，考慮不同枕木配置方式、斷面幾何以及材料參數等，探討懸接法與托接法枕木配置方式、環氧樹脂厚度、魚尾鈑長度及環氧樹脂柏松比等變數，對軌道絕緣接頭材料介面應力之影響。
數值分析結果發現，相較於懸接法枕木配置方式，托接法能有效降低鋼軌與魚尾鈑間環氧樹脂與鋼鐵材料之介面應力。其次，當環氧樹脂厚度增加時，於採用托接法情況下，下半部材料介面正向拉應力隨之增加，其餘應力則隨厚度增加而減少。當魚尾板長度較短時，採用托接法所求得之正向拉應力會明顯增加，其餘界面應力並未顯著受到魚尾板長度改變之影響。最後，當環氧樹脂材質屬不可壓縮材料時，數值分析所求得軌道絕緣接頭材料介面之應力會較大且集中。

In the study, the finite element package of ABAQUS is utilized to numerically analyze the stress distributions of bonded insulated rail joints with different geometries and material properties. At first, a numerical model composed of rails, joint bars, epoxy, bolts, insulated sleeves for bolts, insulated sheet between rails, and sleepers, was generated by using the finite element software. Next, a vertical concentrated load was imposed on the bonded insulated rail joint to simulate the weight of a train passing on it. The effects of the suspended and supported placement of sleepers, the thickness and Poisson’s ratio of epoxy, and the length of joint bar on the stress distributions at the interfaces between steel rail and epoxy were evaluated numerically.
Numerical results show that the interfacial stresses at the boundaries between steel rail and epoxy can be effectively reduced when the supported placement of sleepers is employed as compared to the suspended placement of sleepers. The interfacial tensile stress at the bottom part of the bonded insulated rail joint under the supported placement of sleepers is increased but the other interfacial stresses are decreased as the thickness of epoxy is increased. When the length of joint bar becomes shorter, the interfacial tensile stress of the bonded insulated rail joint under the supported placement of sleepers is increased significantly but the other interfacial stresses are affected insignificantly. Also, the interfacial stresses of bonded insulated rail joints are higher and more concentrated when the material property of epoxy becomes incompressible.

摘要 I
Extended Abstract II
誌謝 IX
目錄 XI
表目錄 XIII
圖目錄 XIV
第一章　緒論 1
1.1　前言 1
1.2　研究動機與目的 2
1.3　研究內容與組織 3
第二章　文獻回顧 7
2.1　彈性基礎相關理論 7
2.1.1　具彈性基礎之梁變形通解 7
2.1.2　集中載重作用下之彈性基礎梁變形 9
2.2　絕緣接頭受垂直載重下行為之分析與試驗 11
2.2.1　絕緣接頭之分析 11
2.2.2　絕緣接頭之試驗 14
2.2.3　含道床勁度之絕緣接頭分析 15
第三章　數值分析模型之建立與參數設定 23
3.1　有限元素數值分析模型 23
3.2　數值模型設定 26
3.2.1　材料參數設定 27
3.2.2　接觸與邊界條件設定 27
3.2.3　分析方法 28
3.2.4　網格劃分設定 29
3.2.5　載重設定 32
第四章　數值分析結果與討論 47
4.1　驗證模型幾何之合理性 47
4.2　環氧樹脂厚度對軌道接頭受力之影響 48
4.3　魚尾鈑長度對軌道接頭受力之影響 50
4.4　環氧樹脂柏松比對軌道接頭受力之影響 51
第五章　結論與建議 104
5.1　結論 104
5.2　建議 106
參考文獻 107

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