| 研究生: |
詹雅婷 Chan, Ya-Ting |
|---|---|
| 論文名稱: |
有限元素分析局部尖銳凹槽圓管在循環彎曲負載下之黏塑性行為 Finite Element Analysis on the Viscoplastic Response of Local Sharp-Notched Circular Tubes under Cyclic Bending |
| 指導教授: |
潘文峰
Pan, Wen-Fung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 工程科學系 Department of Engineering Science |
| 論文出版年: | 2014 |
| 畢業學年度: | 102 |
| 語文別: | 中文 |
| 論文頁數: | 84 |
| 中文關鍵詞: | 有限元素分析 、局部尖銳凹槽 、循環彎曲負載 |
| 外文關鍵詞: | Finite element analysis, local sharp-notched, cyclic bending |
| 相關次數: | 點閱:159 下載:6 |
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本研究是以有限元素分析軟體 ANSYS Workbench 14.0 分析在不同曲度率下SUS304 不鏽鋼局部尖銳凹槽圓管受到對稱曲度循環彎曲負載下之黏塑性行為。其中所考慮的曲度率包含0.0035、0.035和0.35 m-1s-1,而局部尖銳凹槽深度有 0.2、0.4、0.6、0.8和1.0 mm,局部尖銳凹槽之方向有0、30、60和90度。至於循環彎曲的曲度則控制在+0.3至-0.3 m-1之間。分析的行為包含彎矩-曲度及橢圓化-曲度之關係。由ANSYS分析結果顯示,在同一曲度率下,凹槽的深度和不同方向之凹槽對彎矩-曲度的關係幾乎沒有影響。當加載曲度率較快時,則彎矩-曲度之迴圈較大,反之,彎矩-曲度圖之迴圈則較小。在同一曲度率下,隨著凹槽深度的增加橢圓化-曲度之關係不對稱的情況會越來越明顯,並且橢圓化增加的越快。而當凹槽深度固定為1.0 mm時,隨著角度的增加,橢圓化-曲度關係會從不對稱趨於對稱的趨勢。而當曲度率較快時,則橢圓化-曲度關係成長的速度較快,反之,橢圓化成長之速度則較慢。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有些許差異,但兩者的趨勢卻非常相似。
In this study, finite element software ANSYS Workbench 14.0 is used to analyze the viscoplastic behavior of local sharp-notched SUS304 stainless steel tubes under curvature-controlled symmetrical cyclic bending with different curvature-rates. Wherein the different curvature-rate were 0.0035, 0.035 and 0.35 m-1s-1, respectively, and the sharp depth were 0.2, 0.4, 0.6, 0.8 and 1.0 mm, respectively, and the direction were 0, 30, 60 and 90 degrees, respectively. The curvature of the cyclic bending is controlled between +0.3 to -0.3 m-1. It is observed that the higher the applied curvature-rate, the greater is the degree of hardening of SUS304 tubes. The ovalization of tube cross-section increases when the applied curvature-rate increase. 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.
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