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系統識別號 U0026-1408202000013100
論文名稱(中文) 有多餘圓孔的圓孔管在循環彎曲負載下行為 與失效之實驗研究
論文名稱(英文) Experimental Study on the Response and Failure of Round-hole Tubes with a Redundant Hole under Cyclic Bending
校院名稱 成功大學
系所名稱(中) 工程科學系
系所名稱(英) Department of Engineering Science
學年度 108
學期 2
出版年 109
研究生(中文) 陳昱安
研究生(英文) Yu-An Chen
學號 N96074340
學位類別 碩士
語文別 中文
論文頁數 65頁
口試委員 指導教授-潘文峰
口試委員-陳蓉珊
口試委員-劉立偉
口試委員-李國龍
口試委員-張高華
中文關鍵字 圓孔管  多餘圓孔  曲率  彎矩  橢圓化  臨界橢圓化  循環至損壞圈數 
英文關鍵字 Round-Hole Tubes  Redundant Hole  Curvature  Moment  Ovalization  Cyclic Bending  Number of Bending Cycles Required to Ignite Failure 
學科別分類
中文摘要 本文實驗研究有多餘圓孔的6061-T6圓孔管在循環彎曲負載下的行為與失效,而多餘圓孔與圓孔管的圓孔直徑相同且在相同的截面上。本文考慮五種不同圓孔直徑分別為:2、4、6、8及10 mm,而五種不同角度的多餘圓孔方向分別為:45o、67.5o、90o、135o及180o。根據實驗的彎矩-曲率關係中發現,從第一循環圈數起曲線即形成一穩定的迴圈,且圓孔直徑與圓孔方向對該曲線幾乎沒有影響。而從實驗的橢圓化-曲率關係中發現,隨著循環圈數的增加,該曲線呈現不對稱、棘齒、蝴蝶結狀的增加趨勢,且圓孔直徑越大橢圓化就增加的越快。由實驗個別多餘圓孔方向的控制曲率-循環至損壞圈數雙對數座標關係中可以發現,五種不同的圓孔直徑對應出五條平行的直線,至於臨界橢圓化-控制曲率關係中可發現,越大的控制曲率將會導致越大的臨界橢圓化。最後本文提出理論來描述有多餘圓孔的6061-T6圓孔管在循環彎曲負載下的控制曲率-循環至損壞圈數的關係,並與實驗結果相互比較後可發現,理論可以合理的描述實驗結果。
英文摘要 This paper experimentally studies the behavior and failure of 6061-T6 round-hole tubes with redundant hole under cyclic bending. and the redundant hole have the same diameter and the same cross-section as the round holes of the round hole tube. This paper considers five different circular holes with diameters of 2, 4, 6, 8 and 10 mm, and the five different angles of redundant circular holes are 45o, 67.5o, 90o, 135o and 180o. During the symmetrical cycling bending, the moment-curvature relationship is found that the curve forms a stable loop from the first cycle, and the diameter of the hole and the direction of the hole have almost no effect on the curve. From the ovalization-curvature relationship, it is found that with the increase of the number of cycles, the curve shows an increasing trend of asymmetry, ratchet, and butterfly-shape, and the larger the diameter of the hole, the faster the ovalization increases. It is shown from the experimental controlled curvature-number of bending cycles required to produce failure relationships on a log-log scale that five different diameters of the round hole correspond to five parallel straight lines. As for the critical ovalization -control curvature relationship, it can be found that, The larger the control curvature, the larger the critical ovalization. Finally, this paper proposes a theory to describe the relationship between the control curvature of the 6061-T6 round hole tube with redundant round holes under controlled curvature and the number of bending cycles required to produce failure. By comparing the theoretical analysis with the experimental data, it is shown that the theoretical formulation can properly simulate the experimental results.
Key words: Cyclic Bending, Moment, Curvature, Ovalization, Number of Bending Cycles Required to Produce Failure, redundant hole Tubes
論文目次 摘要(i)
英文延伸摘要(ii)
誌謝(xiii)
目錄(xiv)
圖目錄(xvi)
表目錄(xx)
符號說明(xxi)
第一章 緒論(1)
1-1 研究動機(1)
1-2 文獻回顧(1)
1-3 研究目的(7)
第二章 實驗設備(8)
2-1 彎管試驗機(8)
2-2 油壓伺服控制系統(11)
2-3 監控系統(17)
2-4 檢測儀器(19)
2-5 實驗原理(22)
2-6 實驗效能(23)
第三章 實驗方法(26)
3-1 實驗材料與規格(26)
3-2 實驗方式(28)
3-3 實驗步驟(28)
3-4 實驗數據整理(30)
3-5 實驗注意事項(32)
第四章 實驗結果與理論分析(34)
4-1 實驗結果(34)
4-1-1 彎矩與曲率之關係(34)
4-1-2 橢圓化與曲率關係(38)
4-1-3 控制曲率與循環至損壞圈數之關係(46)
4-1-4 臨界橢圓化與曲率之關係(49)
4-2 理論分析(49)
4-2-1 理論公式(50)
4-2-2實驗結果與理論比較(56)
第五章 結論(62)
參考文獻(63)
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13.C. C. Chung, K. L. Lee and W. F. Pan, Collapse of sharp-notched 6061-T6 aluminum alloy tubes under cyclic bending, International Journal of Structural Stability and Dynamics, Vol. 16, No. 7, 1550035 [24 pages] (2016).
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16.K. L. Lee, M. L. Weng and W. F. Pan, On the failure of round-hole tubes under cyclic bending, Journal of Chinese Society of Mechanical Engineering, Vol. 40, No. 6, pp. 663-673 (2019).
17.楊善淵,相同截面不同孔徑的多餘圓孔對圓孔管承受循環彎曲負載行為影響之實驗研究,國立成功大學工程科學研究所碩士論文(2019)。
18.K. L. Lee, L. C. Chin and W. F. Pan, Elastoplastic response and failure of round-hole tubes under cyclic bending, Informatica, Vol. 31, No. 4, pp. 23-41 (2020).
19.S. Kyriakides and P. K. Shaw, Inelastic buckling of tubes under cyclic bending, ASME Journal of Pressure Vessel and Technology, Vol. 109, No. 2, pp. 169-178 (1987).

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