系統識別號 U0026-0812200915114789 論文名稱(中文) 橢圓形凹槽薄壁管在循環彎曲負載下橢圓化和循環至皺曲圈數關係之研究 論文名稱(英文) The Relationship Between the Ovalization and Numbers of Cycle to Produce Buckling of Thin-Walled Tubes with Elliptical Notch under Cyclic Bending 校院名稱 成功大學 系所名稱(中) 工程科學系碩博士班 系所名稱(英) Department of Engineering Science 學年度 97 學期 2 出版年 98 研究生(中文) 黃鈺茜 研究生(英文) Yu-Chien Huang 學號 N9696423 學位類別 碩士 語文別 中文 論文頁數 59頁 口試委員 口試委員-張高華口試委員-盧俊愷指導教授-潘文峰口試委員-王榮泰口試委員-葉維磬 中文關鍵字 對稱曲率循環彎曲  橢圓化變化量 英文關鍵字 symmetrical curvature-controlled cyclic bending  ovalization 學科別分類 中文摘要 本文係針對SUS 304 不鏽鋼薄壁管在中央具有橢圓形凹槽的情形， 控制不同對稱曲率循環彎曲負載至皺曲的試驗。實驗試件係採用寬度固定(2.0 mm)，而五種不同深度(0.2、0.4、0.6、0.8 及1.0 mm)的橢圓形凹槽SUS 304 不鏽鋼管，在相同曲率速率下(0.035 m-1/s)做對稱曲率控制的循環彎曲試驗，以求得不同凹槽深度的橢圓化變化量和循環圈數之間的關係。 本文發現橢圓化變化量和循環圈數的曲線大致可分成三階段，起 始、第二及第三階段，而該曲線的趨勢和單軸潛變的應變與時間曲線非常相似。最後，本文修正單軸潛變的Bailey- Norton Law 以描述不同凹槽深度的橢圓化變化量和循環圈數關係的起始及第二階段行為。經由實驗數據與理論分析數據的比較後發現，理論能合理的描述實驗結果。 英文摘要 This paper presents the experimental investigation of the buckling of the SUS 304 stainless steel tubes with elliptical notch subjected to symmetrical curvature-controlled cyclic bending. There are five kinds of different depths of elliptical notch (0.2, 0.4, 0.6, 0.8 and 1.0 mm) with a same width (1.0 mm) of SUS 304 stainless steel tubes. The tube bending machine and curvature-ovalization measurement apparatus were used to conduct the constant curvature-rate (0.035 m-1/s) cyclic bending test for obtaining the relationship between the ovalization and number of cycles. It can be observed from the experimental curve of the ovalization and the number of cycles could be divided into three stages, the initial, secondary and tertiary stages. These three stages are very similar to the three stages of uniaxial creep. The Bailey-Norton creep formulation was modified so that it can be used to simulate the curve for the initial and secondary stages. By comparing the theoretical simulation with the experimental data, good agreement between the experimental and theoretical results has been achieved. 論文目次 摘 要 ------------------------------------------------------------------------ Ⅰ Abstract ------------------------------------------------------------------------ Ⅱ 誌 謝 ------------------------------------------------------------------------ Ⅲ 目 錄 ------------------------------------------------------------------------ Ⅳ 表 目 錄 ------------------------------------------------------------------------ Ⅵ 圖 目 錄 ------------------------------------------------------------------------ Ⅶ 符 號 ------------------------------------------------------------------------ XI 第一章 緒論--------------------------------------------------------- 1 1-1 研究動機------------------------------------------------------ 1 1-2 文獻回顧------------------------------------------------------ 2 1-3 研究目的------------------------------------------------------ 7 第二章 實驗設備--------------------------------------------------- 8 2-1 彎管實驗機本體--------------------------------------------- 8 2-2 油壓伺服控制系統------------------------------------------ 10 2-3 電腦監控系統------------------------------------------------ 11 2-4 檢測儀器------------------------------------------------------ 12 2-5 實驗原理------------------------------------------------------ 13 2-6 整體效能------------------------------------------------------ 14 第三章 曲率-橢圓化量測裝置---------------------------------------- 24 3-1 曲率量測器---------------------------------------------------- 24 3-2 橢圓化量測器------------------------------------------------- 25 第四章 實驗方法--------------------------------------------------- 30 4-1 試驗材料------------------------------------------------------ 30 4-2 實驗方式------------------------------------------------------ 30 4-3 實驗流程------------------------------------------------------ 31 4-4 資料收集與整理--------------------------------------------- 33 第五章 實驗結果與理論分析------------------------------------ 41 5-1 循環彎曲實驗結果------------------------------------------ 41 5-2 理論分析------------------------------------------------------ 44 第六章 結論--------------------------------------------------------- 56 參考文獻 ------------------------------------------------------------------------ 57 參考文獻 1. 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M., 1998, “A Curvature-Ovalization Measurement Apparatus for Circular Tubes under Cyclic Bending,” Experimental Mechanics, Vol. 38, No.2, pp. 99-102. 7. Pan, W. F. and Her, Y. S., 1998, “Viscoplastic Collapse of Thin-Walled Tubes under Cyclic Bending,” Journal of Engineering Materials and Technology, Vol. 120, pp. 001-004. 8. Pan, W. F. and Fan, C. H., 1998, “An Experimental Study on the Effect of Curvature-Rate at Preloading Stage on Subsequent Creep or Relaxation of Thin-Walled Tubes under Pure Bending,” JSME International Journal, Series A, Vol. 41, No.4, pp. 525-531. 9. Lee, K. L., Pan, W. F. and Kuo, J. N., 2001, “The Influence of the Diameter-to-Thickness Ratio on the Stability of Circular Tubes under Cyclic Bending,” Solids and Structures, Vol.38, pp. 2401-2413. 10. Lee, K. L., Shie, R. F. and Chang, K. H., 2005, "Experimental and Theoretical Investigation of the Response and Collapse of 316L Stainless Steel Tubes Subjected to Cyclic Bending,” JSME International Journal, Series A, Vol. 48, No.3, pp. 155-162 . 11. Chang, K.H., Pan, W.F. and Lee, K.L., 2008, “Mean Moment Effect on Circular Thin-walled Tubes under Cyclic Bending,” Structural Engineering and Mechanics - an International Journal, Vol. 28, No.5, pp. 495-514. 12. 涂佳銘，2008，「尖銳凹槽薄壁管在循環彎曲負載下橢圓化和循環至皺曲圈數關係之研究」，國立成功大學工程科學研究所碩士 論文。 13. 陳信嘉，2006，「不同內直徑及外直徑SUS 304不銹鋼管在循環彎曲負載下力學行為及皺曲損壞之實驗分析」，國立成功大學工程 科學研究所碩士論文。 論文全文使用權限 同意授權校內瀏覽/列印電子全文服務，於2011-06-30起公開。同意授權校外瀏覽/列印電子全文服務，於2011-06-30起公開。

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