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研究生:江偉傑
研究生(外文):Jei-Wei Jiang
論文名稱:數位影像法於變形量測
論文名稱(外文):Digital Image Correlation Applied in Strain Measurement
指導教授:黃順發黃順發引用關係
指導教授(外文):Shun-Fa Hwang
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:機械工程系碩士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:74
中文關鍵詞:全場應變數位影像選擇性地毯式最佳化
外文關鍵詞:digital imagefull-field strainselectively exhaustive optimization
相關次數:
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本文主要是探討一種利用數位影像特性來獲得全場非線性應變資料的方法。數位影像關係法即所謂的DIC(Digital Image Correlation)是利用數位影像以數值來表示和記錄影像的特性,並對這些儲存影像的數值加以分析以得到所需的資訊。而在本文的領域中,藉著比對相關成對影像來得到全場應變和位移的分佈,在過程中所使用數值方法處理是主要的關鍵,除了在原始影像數值之間的平滑化和連續化處理之外,影像與影像的相關程度數值最佳化過程更是最重要的步驟。而在這最重要的步驟的處理上,本研究應用”選擇性地毯式”搜尋的觀念以收斂最後的結果,除此之外亦針對變數與目標函數的關係,設計數種數值方法以求解,再依此數值方法求得之結果,換算得到全場變形的各項參數。而最後將對已知材料性質的材料做測試中,將所有的數值方法得到的結果,與實際拉伸試驗機的結果加以比對,裨以建立一套方便有效準確性高的測量方法。
This text presents a new numerical conception of digital image correlation to measure full-field strain in planar specimen which is suffering external force. This new method can afford strain information on entire field of specimen surface by processing two digital images which were respectively caught from the unforced and forced specimen. The new numerical procedures here aim at making this method a widely applicatory strain measuring method. It means that ideally this method can be applied in various conditions. Two numerical iterative methods are used to conclude the whole optimized strain solution in this research. Both two numerical methods can appropriately be called “selectively exhaustive optimization”.This is because each iterative method is an exhaustive optimization method with techniques of reducing time consumption. While all numerical procedures finished, the optimized strain solutions are verified and compared with the experimental results from MTS.
中文摘要 …………………………………………………………… I

英文摘要 …………………………………………………………… II

誌謝 ……………………………………………………………. III

目錄 …………………………………………………………… IV

圖目錄 …………………………………………………………… VI


第一章
簡介……………………………………………………………..
-1-
1.1 前言……………………………………………………………. -1-
1.2 DIC的特性及發展…………………………………………….. -1-
1.3 DIC的潛力和優點………………………………………......... -3-
1.4 研究動機及方向………………………………………………. -4-

第二章
理論基礎........………………………………..…………………
-6-
2.1 數位影像……………..………………………………………… -6-
2.1.1 人類視覺…………………………………..…………………… -6-
2.1.2 數位影像……………………………………………………….. -6-
2.2 變形理論……………………………………………………….. -9-
2.2.1 應變-位移(Strain-Displacement) 關係…………..……………. -9-
2.2.2 應變和位移造成點的座標移動……………………………..… -13-
2-3 標準化與交相關函數……………………………………….… -14-
2.3.1 交相關函數………………………………………….………… -14-
2.4 DIC運用在變形的量測……………………………………….. -15-
2.4.1 基本構想……………………………………………………….. -15-
 2.4.2 基本假設……………………………………………………….. -16-
2.5 離散影像的平滑化…………………………………………….. -18-
2.5.1 不連續影像的平滑化…………………...................................... -18-
2.5.2 灰度內插……………………………………………………….. -20-

第三章
研究步驟及方法………………………………………………..
-22-
3.1 使用儀器……………………………………....………………. -23-
3.2 試片取樣…….………………………………………………… -23-
3.2.1 拉伸實驗流程及步驟….………………………………………. -23-
3.2.1 剛體旋轉實驗流程及步驟…………………………………..… -25-
3.3 數位影像在DIC上的前處理………………………………… -26-
3.3.1 RGB數位影像的轉灰階過程………………………………… -26-
3.3.2 維度轉換….……………………………………………………. -27-
3.3.3 位移基準線(shift)……………………………………………… -27-
3.4 DIC觀念於程式演繹………………………………………...... -29-
3.4.1 程式的基本要求與大綱…………………………………….… -29-
3.4.2 欲比對之成對陣列選定…………………………………….… -30-
3.4.3 依照應變參數指定與原圖上CZ比對的CZ`…………….…… -31-
3.4.4 以交互關聯函式(cross-corelation Function)判斷影像的相依性……………………………………………………………….
-33-
3.5 選擇性地毯式逼近法最佳化………………………………….. -34-
3.5.1 地毯式搜索…………………………………………………….. -34-
3.5.2 數值最佳化的過程-Iterative的過程(一)……………………… -34-
3.5.3 數值最佳化的過程-回溯疊代的過程(二)…………………….. -38-
3.5.4 保障條款……………………………………………………….. -39-

第四章
驗證與結果討論………………………………………………..
-42-
4.1 基本性質分析………………………………………………….. -42-
4.1.1 交相關函數與變數的關係…………………………………….. -42-
4.2 耗費計算時間分析…………………………………………….. -45-
4.3 方法(一)的結果………………………………………………... -46-
4.3.1 əV/ əy的檢驗………………………………………………….. -46-
4.3.2 其餘變數之結果……………………………………………….. -46-
4.3.3 法(一)剛體旋轉運動試片結果………………………………... -49-
4.3.4 cz_size對結果造成的影響……………………………………. -50-
4.4 方法(二)的結果………………………………………………... -51-
4.4.1 數值求解的依據驗證過程中解的變化……………………….. -51-
4.4.2 第二種方法過程中最佳解的統計…………………………….. -54-
4.4.3 二種方法的比較……………………………………………….. -56-

第五章
結論…………………………………………………………….
-59-
參考文獻……………………………………………………….. -60-
1. Leederiz, J.A., 1970 ,“Interferometry measurement of scattering surface utilizing speckle effect,” J . Physic E Scientific Inst.,3,214-218
2. Archbold, E., Burch, J.M., and Ennos, A.E., 1970, “Recording on in-plane surface displacement by double exposure speckle photography,” Opt. Act., 17,883-898
3. Archbold, E., and Ennos, A.E., 1972, “Displacement measurement from double exposure laser photographs,” Ibid.,19,253-271
4. Duffy, D.E., 1982, “Moirè gauging of in-plane displacement using double aperture image,” Appl.Opt.,11(8),1778-1781
5. Sharpe, W.N. Jr., Yuan, B., Edwards, R.L., 1997, “ A new technique for measuring the mechanical properties of thin films,” Journal of Microelectromechanical Systems , 6(3) ,193-199
6. Peters, W. H., and Ranson, W. F., 1982, “ Digital image techniques on experimental stress analysis” Opt.Eng.,21(3),427-431
7. Sutton, M. A., Wolters, W. J., et al, 1983, “ Determination of displacements using an improved digital image correlation method,” Image Vision Computing,1(3), 133-139
8. Chu, T. C., Peters, W. H., Sutton, M. A., McNeil, S. R., 1985, “ Application of digital image correlation to experimental mechanics,” Image Vision Computing, 25(3), 232-245
9. Sutton, M. A., McNeil, S. R., et al, 1988, “Effect of subpixels image restoration on digital correlation error estimates,” Opt. Eng.,27(10), 870-877
10. Sutton, M. A., Peters, W. H., Chao, Y. J., Luo, P. F., 1993, “Accurate measurement of three-dimensional Deformations in deformable and rigid bodies using computer vision,” Experimental Mechanics, 33(2). 123-132
11. Sutton, M. A., McNeil, S. R., et al, 1997, “ Measurement of surface profile using digital image correlation, “ Experimental Mechanics, 37(1),13-20
12. Oulamara, A., Tribillon, G., Dunvernoy, J., 1988, “ Subpixel speckle displacement using a digital processing technique,” Journal of Modern Optics, 37, 1201-1211
13. James, M. R., Morris, W. L., Cox, B. N., 1990, “ A high accuracy automated strain -field mapper,” Experimental Mechanics, 30(1), 60-67
14. Septanika, E. G., Ernst, L. J., van den Hoof, L. A. C. M., 1998, “ An automatic and interactive large-deformation measurement system based on image processing,”
Experimental Mechanics, 38(3), 181-188
15. Choi, S., Shah, S. P., 1997, “ Measurement of deformations on concrete subjected to compression using image correlation,” Experimental Mechanics,37(3),307-313
16. Périé, Jean-Noël, Calloch, Sylvain, et al, 2002, “Analysis of a multiaxial test on a c/c composite by using digital image correlation and a damage model , ” 42(3), 318-328
17. Lu, H., Vendroux, G. Knauss, W. G., 1997 ,“ Surface deformation measurements of cylindrical specimen by digital image correlation.” Experimental Mechanics, 37(4), 433-439
18. Li, E. B.,Tieu, A. K., Yuen, W. Y. D., 2003, “Application of digital image correla- tion technique to dynamic measurement of the velocity field in the deformation zone in cold rolling,” Optics and Lasers in Engineering,39,479-488
19. Chasiotis, Loannis., Knauss, W. G., 2002,“A new microtensile tester for the study of MEMS materials with the aid of atomic force microscopy,” Experimental Mec- hanics,42(1),51-57
20. Lockwood,W. D., Reynolds,A. P., 1999, “Use and verification of digital image co- rrelation for automated 3D surface characterization in the scanning electron micr- oscope,” Materials characterization,42,123-134
21. Vogel, D., Gollhardt, A., Michel, B., 2002, “Micro- and nanomaterials character- rization by image correlation methods,” Sensors and Actuators, 99, 165–171
22. Yu Wang, Alberto M, Cuitino, 2002, “Full-field measurements of heterogeneous
deformation patterns on polymeric foams using digital image correlation,” Inter- national Journal of Solids and Structures, 39, 3777–3796
23.Department of Mechanical and Aerospace Engineering, Rutgers University, Busch Campus, Engineering Building, Rm D10398 , Brett Road, Piscataway, NJ 08854, USA
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