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研究生：	黃莉婷 Huang, Li-Ting
論文名稱：	利用數位影像相關法量測鋼結構常見填角銲接頭之應力強度因子 Measurement of Stress Intensity Factors for Some Common Fillet Welded Joints in Steel Structures by Digital Image Correlation Method
指導教授：	鍾興陽 Chung, Hsin-yang
學位類別：	碩士 Master
系所名稱：	工學院 - 土木工程學系 Department of Civil Engineering
論文出版年：	2009
畢業學年度：	97
語文別：	中文
論文頁數：	142
中文關鍵詞：	裂縫張開位移、應力強度因子、最小二乘法、數位影像相關法、搭接、十字接頭、填角銲
外文關鍵詞：	Crack Opening Displacement, Lap Joints, Least-Squares Method, Digitals Image Correlation, Fillet Welds, Stress Intensity Factor, Cruciform Joints
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本論文以實驗的方式研究承拉型填角銲十字接頭與填角銲搭接構件等鋼結構常見的填角銲接頭，利用數位影像相關法分析接頭裂縫尖端附近的位移，並求得裂縫在x方向、y方向的裂縫張開位移，再配合最小二乘法求得在張裂模式（Mode I）與剪切模式（Mode II）下的應力強度因子（KI與KII）。實驗的試體包含承拉型填角銲十字接頭試體十五支、單搭接-雙填角銲試體三支與雙搭接-雙填角銲試體五支，所有的試體皆在測試所得之最佳的數位影像參數下進行實驗與分析。經由數位影像相關法所得之各試體應力強度因子與有限元素數值模擬結果或現有的英國規範BS7910公式解相比較，皆有不錯的精度。此外，本研究也發現數位影像相關法能夠比記號點法提供較精準的量測結果。

This thesis experimentally determined the opening mode (mode I) and shearing mode (mode II) stress intensity factors (KI and KII) for some common fillet welded joints, including load-carrying fillet welded cruciform joints and fillet welded lap joints, in steel structures by Digital Image Correlation Method and Least-Squares Method. A total of fifteen load-carrying fillet welded cruciform joint specimens, three fillet welded single lap joint specimens and five fillet welded double lap joint specimens were studied in this research, and all the specimens were tested and analyzed by the optimal digital image parameters obtained from the parameter study. The SIF results of the specimens determined by Digital Image Correlation Method and Least-Squares Method were as precise as the results from the finite element analyses or the formula provided in the British Standards BS7910. In addition, this research also found that Digital Image Correlation Method can provide more precise measurement results than Symbol Dot Method.

摘要......................................................I
Abstract.................................................II
誌謝....................................................III
目錄.....................................................IV
表目錄...................................................VI
圖目錄.................................................VIII
符號表...................................................XI
第一章 緒論...............................................1
1 研究背景與動機........................................1
2 研究目的..............................................2
3 研究方法與範圍........................................3
4 論文架構..............................................4
第二章 文獻回顧...........................................7
1 數位影像相關法文獻....................................7
2 接頭應力強度因子文獻..................................9
第三章 數位影像相關法量測系統............................11
1 前言.................................................11
2 設備介紹.............................................11
2.1 顯微鏡鏡頭.........................................12
2.2 冷光光源...........................................12
2.3 數位相機...........................................12
2.4 特製腳架...........................................13
3 軟體介紹.............................................13
3.1 拍攝軟體...........................................13
3.2 數位影像相關法程式.................................14
3.3 應力強度因子計算程式...............................17
第四章 實驗流程與分析討論................................27
1 前言.................................................27
2 試體種類與介紹.......................................27
2.1 承拉型填角銲十字接頭試體...........................28
2.2 單搭接-雙填角銲試體................................29
2.3 雙搭接-雙填角銲試體................................29
3 實驗流程.............................................30
3.1 試體準備...........................................30
3.2 實驗儀器架設及流程.................................31
3.3 程式分析流程.......................................33
4 影像分析討論.........................................36
4.1 影像清晰度問題.....................................36
4.2 亮度控制...........................................37
4.3 隨機微點密度控制...................................39
4.4 像素區塊大小控制...................................40
第五章 實驗結果與比較....................................70
1 前言.................................................70
2 數位影像相關法實驗結果與比較.........................71
2.1 承拉型填角銲十字接頭試體實驗結果與比較.............71
2.2 單搭接-雙填角銲試體實驗結果與比較..................74
2.3 雙搭接-雙填角銲試體實驗結果與比較..................76
3 數位影像相關法與記號點法比較.........................77
4 誤差討論.............................................79
第六章 結論與建議.......................................136
參考文獻................................................139
自述....................................................142
                                    

British Standard 7910 Guide on methods for assessing the acceptability of flaws in metallic structures, British Standard Institution, London, UK. (2005)

Chu TC, Ranson WF, Sutton MA and Peters WH. Applications of digital- image-correlation technique to experimental mechanics. Experimental Mechanics;25(3):232-244(1985)

Helm JD. Digital Image Correlation for Specimens with Multiple Growing Cracks. Experimental Mechanics;48(6):753-762(2008)

Helm JD, McNeill SR and Sutton MA. Improved three-dimensional image correlation for surface displacement measurement. Optical Engineering; 35(7):1911-1920(1996)

Hsu DS and Ju SH. Micro SAP-Finite Element Structural Analysis Package. Unalis Corporation, Taiwan. (1988)

Hua T, Xie HM, Pan B, Wang QH and Dai FL. A new mark shearing technique for strain measurement using digital image correlation method. Review of Scientific Instruments;79(10)(2008)

Irwin GR and Washington DC. Analysis of stresses and strains near the end of a crack traveling a plate. Journal of Applied Mechanics; 24:361-364 (1957)

Ju SH. Simulating three-dimensional stress intensity factors by the least-squares method. International Journal for Numerical Methods in Engineering;43(8):1437-1451(1998)

Ju SH and Liu SH. Determining stress intensity factors of composites using crack opening displacement. Composite Structures;81(4):614-621(2007)
Ju SH, Liu SH and Liu KW. Measurement of stress intensity factors by digital camera. International Journal of Solids and Structures; 43(5):1009-1022(2006)

Lyons JS, Liu J and Sutton MA. High-temperature deformation measurements using digital-image correlation. Experimental Mechanics; 36(1):64-70(1996)

McNeill SR, Peters WH and Sutton MA. Estimation of Stress Intensity Factor by Digital Image Correlation. Engineering Fracture Mechanics; 28(1):101-112(1987)

Schreier HW, Braasch JR and Sutton MA. Systematic errors in digital image correlation caused by intensity interpolation. Optical Engineering; 39(11):2915-2921(2000)

Sun ZL, Lyons JS and McNeill SR. Measuring microscopic deformations with digital image correlation. Optics and Lasers in Engineering; 27(4):409-428(1997)

林坤震，“不同寬厚度對接鋼板接頭應力強度因子之研究”，國立成功大學土木工程系，碩士學位論文(2008)

林奕佐，“鋼構填角銲搭接接頭應力強度因子之研究”，國立成功大學土木工程系，碩士學位論文(2007)

林容暄，“承拉型填角銲十字接頭應力強度因子之量測與數值分析”，國立成功大學土木工程系，碩士學位論文(2007)

涂森屏，“應用影像相關性量測變位”，國立成功大學土木工程系，碩士學位論文(2007)

劉淑秀，“應用數位相機發展非接觸式量測技術及建立自動化運算程式”，國立成功大學土木工程系，博士學位論文(2007)

劉凱偉，“應用數位相機技術量測複合材料之應力集中係數”，國立成功大學土木工程系，碩士學位論文(2004)

蔡松木，“利用數位相機量測裂縫應力集中係數之研究”，國立成功大學土木工程系，碩士專班論文(2004)

校內：2014-07-29公開
校外：2029-07-29公開電子論文尚未授權公開，紙本請查館藏目錄

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