臺灣博碩士論文加值系統

本研究是以有限元素軟體ANSYS Workbench 14.0分析，局部尖銳凹槽SUS304不鏽鋼圓管承受對稱曲度循環彎曲負載下之力學行為。其中所考慮的局部尖銳凹槽的深度有：0.2、0.4、0.6、0.8和1.0 mm，所考慮的局部尖銳凹槽的方向有：0、30、60和90度，而分析的行為包含有：彎矩-曲度及橢圓化-曲度關係。ANSYS分析結果顯示，尖銳凹槽的深度對彎矩-曲度的關係幾乎沒有影響，但橢圓化-曲度關係則隨著凹槽深度增加，不對稱的現象會越加明顯，且橢圓化增加的速度也會越快。當考慮凹槽深度固定為1.0 mm時，不同凹槽方向對彎矩-曲度關係的影響也不太明顯，但橢圓化-曲度關係，則隨角度增加不對稱的現象會趨於對稱。此外，本研究的ANSYS分析也與實驗結果進行比較，結果顯示模擬數值雖與實驗值有些許差異，但兩者的趨勢卻非常相似。

In this study, the finite element software ANSYS Workbench 14.0 is used to analyze the mechanical behavior of local sharp-notched SUS304 stainless steel tubes under curvature-controlled cyclic bending. The local sharp-notched depths include: 0.2, 0.4, 0.6, 0.8 and 1.0 mm, and the local sharp-notched directions include: 0, 30, 60 and 90 degree, the analysis behaviors include: moment-curvature and ovalization-curvature relationships. According to the analysis result, the notch depth has no influence on the moment-curvature relationship. But the notch depth increases, the unsymmetrical phenomenon of the ovalization-curvature relationship becomes increasingly obvious and the speed of ovalization also increases. When we consider a constant notch depth of 1.0 mm, the notch direction has no influence on the moment-curvature relationship. But the ovalization-curvature relationship becomes symmetrical when the angle increases. In addition, the ANSYS analysis is compared with the experimental data. Although some differences between the experimental and simulated results, but the trends are very similar between the two.

摘要I
AbstractII
誌謝III
目錄IV
表目錄VII
圖目錄VIII
符號說明XIII
第一章 緒論1
1-1 研究背景及動機1
1-2 文獻回顧2
1-3 論文內容8
第二章 理論基礎9
2-1 有限元素分析法【19】9
2-2 塑性理論介紹【20】11
2-3 ANSYS有限元素分析軟體介紹【21】【22】17
2-3-1 前處理(pre-processing)17
2-3-2 有限元素分析(finite element analysis)19
2-3-3 後處理(post-processing)20
2-4 ANSYS Workbench操作介面介紹【23】21
第三章 ANSYS Workbench分析26
3-1 材料參數設定26
3-2 有限元素模型之建立27
3-2-1 幾何模型28
3-2-2 網格分割30
3-2-3 元素說明【25】32
3-3 邊界條件與負載設定33
3-3-1 邊界條件設定 33
3-3-2 負載設定34
3-4 求解過程37
第四章 ANSYS分析結果39
4-1 實驗介紹39
4-2 彎矩與曲度關係39
4-2-1 實驗結果39
4-2-2 ANSYS分析結果41
4-3 橢圓化與曲度關係46
4-3-1 實驗結果46
4-3-2 ANSYS分析結果51
4-4 ANSYS分析尖銳凹槽方向對橢圓化之影響56
4-5 網格精度對彎矩和橢圓化之影響57
第五章 結論59
參 考 文 獻61

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