本文利用CCD數位攝影機來檢視凹痕圓管受到循環彎曲負載時的凹痕變形，而CCD數位攝影機所拍攝的影像，可透過影像處理的軟體來獲得更清晰的凹痕變形結果。為了要固定CCD數位攝影機使其不會搖晃而導致圖片模糊不清，本研究設計一個支架使CCD數位攝影機能夠穩定的隨著圓管彎曲負載時上下移動，並且能夠穩定地拍攝凹痕變形。所設計的支架包含：(1) 三點圓柱夾具。係用來固定支架與圓管，則支架上的CCD數位攝影機與圓管的相對位置即可固定。(2)支架平台。係用來放置CCD數位攝影機，並能夠依照需求不同而調整前後距離。(3)垂直軸承支撐基座。係為了使CCD數位攝影機不會搖晃，並能分擔支撐CCD數位攝影機的重量，在平台下方架設支撐軸承，且基座能夠在左右方向做微調整，方便架設不同長度的圓管。為測試該支架，本文對不同深度局部凹痕6061-T6的鋁合金圓管在循環彎曲負載下的凹痕變形進行檢視。結果顯示，除了支架能夠乘載CCD數位攝影機使其能夠穩定的拍攝外，CCD數位攝影機所拍攝的影像經影像處理過後，各深度之凹痕變形皆可清晰的分析出來。

In this study, the CCD digital camera is used to inspect the deformation of the dent for dented tube subjected to cycling bending. Then, the photographs shot by the CCD digital camera are processed on their images to make the images more clear. In order to hold the CCD digital camera to stably shoot the dent’s deformation, a frame is designed to support CCD digital camera during the upward and downward movement under cyclic bending. This frame contains three parts: (1) Three-point cylindrical clamp. It is designed to fix the related location for the tube and clamp. (2) Support platform. It is designed to place the CCD digital camera on the platform and can be adjusted the location between the CCD digital camera and tube. (3) Vertical bearing support pedestal. It is designed to avoid the vertical sway and to support the weight of the CCD digital camera. It can allow a little adjustment for the horizontal direction so that it can set up different lengths of tubes. In this study, the dent’s deformation of local-dented 6061-T6 aluminum alloy circular tubes with different dent depths under cyclic bending is inspected. It is shown that not only the frame can stably support the CCD digital camera to shoot photographs, but the photographs shot by the CCD digital camera can process their images. The deformation of the dent with different dent depths can clearly analyze.

1. W. Shaw, P. K. and Kyriakides, S., 1985, “Inelastic Analysis of Thin-Walled Tubes under Cyclic Bending,” International Journal of Solids and Structures, Vol. 21, pp. 1073-1100.
2. Kyriakides, S. and Shaw, P. K., 1987, “Inelastic Buckling of Tubes under Cyclic Bending,” Journal of Pressure Vessel Technology, Vol. 109, pp.169-178.
3.Corona, E. and Kyriakides, S., 1988, “On the Collapse of Inelastic Tubes under Combined Bending and Pressure,” International Journal of Solids and Structures, Vol. 24, pp. 505-535.
4.F. Pan, T. R. Wang and C. M. Hsu, A curvature-ovalization measurement apparatus for circular tubes under cyclic bending,Experimental Mechanics, Vol. 38, No. 2, pp.99-102 (1998).
5.W. F. Pan and Y. S. Her, Viscoplastic collapse of thin-walled tubes under cyclic bending, Journal Engineering Materials and Technology, Vol. 120, No. 4, pp. 287-290 (1998).
6.K. L. Lee, W. F. Pan and J. N. Kuo, 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, No. 14, pp. 2401-2413 (2001).
7.徐建民、李國龍和潘文峰，圓管在對稱與不對稱循環彎曲負載下力學行為之實驗研究，技術學刊，第十八卷，第二期，257-262頁(2003)。
8.K. L. Lee, W. F. Pan and C. M. Hsu, Experimental and theoretical evaluations of the effect between diameter-to-thickness ratio and curvature-rate on the stability of circular tubes under cyclic bending, JSME International Journal, Series A, Vol. 47, No. 2, pp. 212-222 (2004).
9.林合汶，CCD數位攝影機系統支架之設計與測試，國立成功大學工程科學研究所碩士論文，(2004)
10.張哲源，使用CCD數位攝影機及傾角器量測圓管在循環彎曲負載時之曲度及各截面橢圓化量，國立成功大學工程科學研究所碩士論文，(2004)
11.K. H. Chang, C. M. Hsu, S. R. Sheu and W. F. Pan, Viscoplastic response and collapse of 316L stainless steel under cyclic bending, Steel and Composite Structures, Vol. 5, No. 5, pp. 359-374 (2005).
12.張高華、李國龍和潘文峰，圓管承受循環彎曲負載截面變形量測器之設計，技術學刊，第二十三卷，第一期，21-28頁(2008)。
13.K. H. Chang and W. F. Pan, Buckling life estimation of circular tubes under cyclic bending, International Journal of Solids and Structures, Vol. 46, No. 2, pp. 254-270 (2009).
14.K. L. Lee, C. Y. Hung and W. F. Pan, Variation of ovalization for sharp-notched circular tubes under cyclic bending, Journal of Mechanics, Vol. 26, No. 3, pp. 403- 411 (2010).
15.K. L. Lee, C. Y. Hung and W. F. Pan, CCD digital camera system for measuring curvature and ovalization of each cross-section of circular tube under cyclic bending, Journal of Chinese Institute Engineers, Vol. 34, No. 1, pp. 75-86 (2011).
16.K. L. Lee, C. M. Hsu and W. F. Pan, The influence of diameter-to-thickness ratios on the response and collapse of sharp-notched circular tubes under cyclic bending, Journal of Mechanics, Vol. 28, No. 3, pp. 461-468 (2012).
17.李國龍、洪兆宇和潘文峰，循環彎曲負載下橢圓形凹槽圓管皺曲損壞之實驗分析，中正嶺學報，第四十一卷，第二期，183-190頁(2012)。
18.K. L. Lee, C. M. Hsu and W. F. Pan, Viscoplastic collapse of sharp-notched circular tubes under cyclic bending, Acta Mechanics SolidaSinica, Vol. 26, No. 6, pp. 629- 641 (2013).
19.K. L. Lee, C. H. Meng and W. F. Pan, The influence of notch depth on the response of local sharp-notched circular tubes under cyclic bending, Journal of Applied Mathematics and Physics, Vol. 2, No. 6, pp. 335-341 (2014).