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研究生:林煒凱
研究生(外文):Wei-Kai Lin
論文名稱:有限元素ANSYS分析橢圓形凹槽薄壁管在循環彎曲負載下之力學行為
論文名稱(外文):Finite Element ANSYS Analysis on the Mechanical Behavior of Elliptic-Notched Thin-Walled Tubes under Cyclic Bending
指導教授:潘文峰
指導教授(外文):Wen-fung Pan
學位類別:碩士
校院名稱:國立成功大學
系所名稱:工程科學系碩博士班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
畢業學年度:96
語文別:中文
論文頁數:64
中文關鍵詞:彎矩-曲度橢圓化-曲度橢圓形凹槽SUS304 不鏽鋼
外文關鍵詞:ovalization-curvaturemoment-curvatureelliptic-notchedSUS304 stainless steel
相關次數:
  • 被引用被引用:15
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  • 下載下載:223
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本研究是以有限元素分析軟體ANSYS 分析SUS304 不鏽鋼橢圓形凹槽薄壁圓管承受對稱曲度循環彎曲負載下的力學行為,其中力學行為包含有曲度、彎矩及橢圓化的相互關係,而橢圓凹槽分為兩種,一種為固定凹槽的深度,並改變凹槽的寬度;另一種為固定凹槽的寬度,並改變凹槽的深度。由有限元素ANSYS 分析結果可以觀察出,在控制固定曲度做循環彎曲負載時,彎矩-曲度曲線圖顯示出,在固定凹槽的寬度,當深度較淺時,達到設定的控制曲度所需施加的彎矩相對於凹槽深度較大的圓管要大的多。但是在固定凹槽的深度,改變寬度時對彎矩-曲度曲線並無太大影響。至於在橢圓化-曲度的曲線圖中顯示,橢圓化會隨著循環彎曲的圈數漸增且呈現對稱棘齒的變化,當橢圓化值增加到某一極限時,薄壁圓管便會發生皺曲破壞。當在固定凹槽寬度且不同深度的情況下,凹槽越深,成長的速度累積橢圓化量較快,而在固定凹槽深度且不同寬度的情況下,不同寬度對橢圓化的變化並沒有太大的影響。
The purpose of this thesis is to use finite element software ANSYS to analyze the mechanical behavior of thin-walled SUS304 stainless steel tubes with elliptic-notched subjected to curvature-controlled symmetric cyclic bending. The mechanical behavior contains the relationship among curvature, bending moment and ovalization. There are two kinds of the elliptic-notch. The first case is the variable depth with a fixed notch-width and the second case is variable width with a fixed notch-depth. It can be observed from the moment-curvature curve of the first case that the magnitude of the moment is larger for the deeper depth than that for the shallow depth. But, the change of the width does not influence on the moment-curvature curve for the second case. As for the ovalization-curvature curve, it can be observed that the ovalization increases in a ratcheting manner with the number of the bending cycle. When the magnitude of the ovalization reaches a critical value, the tube buckles. The accumulation of the ovalization for the first case is much faster for the deeper depth than that for the less shallow depth. However, the change of the width does not influence on the ovalization-curvature curve for the second case.
摘 要 --------------------------------------------I
Abstract --------------------------------------------II
誌 謝 --------------------------------------------III
目 錄 --------------------------------------------Ⅳ
表 目 錄 --------------------------------------------VII
圖 目 錄 --------------------------------------------VIII
符號說明 --------------------------------------------XII
第一章 緒論------------------------------------------1
1-1 前言---------------------------------------------1
1-2 文獻回顧-----------------------------------------3
1-3 研究目的-----------------------------------------8
1-4 論文內容-----------------------------------------8
第二章 理論基礎--------------------------------------9
2-1 有限元素分析法-----------------------------------9
2-2 軟體簡介-----------------------------------------13
2-2-1 Pro/Engineer簡介-------------------------------13
2-2-2 ANSYS簡介--------------------------------------15
2-2-2-1 前處理(Preprocessor)模組---------------------15
2-2-2-2 分析計算(solution)模組-----------------------17
2-2-2-3 後處理器(Postprocessor)模組------------------18
2-3 塑性理論基礎-------------------------------------20
第三章 模型之建立與分析------------------------------29
3-1 元素的選擇---------------------------------------29
3-2 圓管材料特性及相關參數---------------------------29
3-3 幾何模型之建立-----------------------------------30
3-4 邊界條件與負載方式-------------------------------31
3-4-1 邊界條件---------------------------------------31
3-4-2 負載方式---------------------------------------31
3-5 求解過程-----------------------------------------32
第四章 ANSYS分析結果---------------------------------42
4-1 彎矩與曲度關係-----------------------------------42
4-2 橢圓化與曲度關係---------------------------------44
第五章 結論------------------------------------------59
參考文獻 --------------------------------------------61
自述 ------------------------------------------------64
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8. W.F.Pan, T.R.Wang and C.M.Hsu, “ A Curvature-Ovalization Measurement Apparatus for Circular Tubes under Cyclic Bending,"Experimental
Mechanics,Int.J.,Vol.38,No.2,pp. 99-102,1998
9. W.F.Pan and Y.S.Her, “Viscoplastic Collapse of Thin- Walled Tubes under Cyclic Bending,"ASME,J. of Engineering Materials and Tech.,Vol.120,pp.287-290,1998
10. W.F.Pan and C.H.Fan, “An Experimental Stady on the Effect of Curvature-Rate at Preloading Stage on Subsequent Creep or Relaxation of Thin-Walled Tubes under Pure Bending,"JSME Int.J.,Series A,Vol.41,No.4,pp.525-531,1998
11. 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,” International Journal of Solids and Structures, Vol.38, pp. 2401-2413.
12. 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, Vol. 48, No.3, pp. 155-162
13. 林俊宏,2006,「有限元素ANSYS分析圓管在循環彎曲負載下之力學行為」,國立成功大學工程科學研究所碩士論文
14. 陳信嘉,2006,「不同內直徑及外直徑SUS 304不�袗�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
15. 林清安,“Pro/ENGINEER Wildfire 2.0基楚入門與範例”知城數位科技股份有限公司,2005
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17. 康淵,陳信吉,“ANSYS入門”,全華圖書,2006.
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