薄壁圓管彎曲過程可能會產生皺褶現象，是不樂意想得到的結果，生產技術之關鍵在於迅速且準確的預防此現象的產生。本論文之主要研究內容即使用有限元素分析模擬，模擬薄壁管彎曲成形過程，根據不同階段的網格變形，以獲得沿著彎曲方向的應力分佈、管壁厚度的變化與斷面變形之關係，進而判斷出合理之加工製程。此外，將模擬結果與實驗結果作比較，以驗證模擬分析結果之可信性。期盼此研究結果能夠提供業者作為參考，累積薄壁圓管彎曲加工之經驗，提升產品之附加價值，進而提升產業之競爭力。

Thin-walled tube bending processes may produce a wrinkling phenomenon if the process parameters were inappropriate. How to predict this phenomenon effectively and accurately is one of the urgent key problems to be solved for the development of this process. By the use of this FE simulation system, a bending process of thin-wall tube had been simulated, and deformed process were recorded under different bending stages. As a result, the stress distribution along the bending direction, and the relationship between the wall thickness variation and cross-section deformation had been obtained, and could thus judge the feasibility of every manufacturing procedure. The experimental results of thin-walled tube bending process were compared with the simulation results. The results of both after compensation were agreeable. The manufacturers can hopefully apply these results to the bending process of stainless tube manufacturing.

1.L. G. Brazier, “ On the Flexure of Thin Cylindrical Shells and Other Thin Sections, ” Proceedings of the Royal Society of London, Vol. 116, pp. 104-114 (1927).
2.B. D. Reddy, “ An Experimental Study of the Plastic Buckling of Circular Cylinders Shells in Pure Bending, ” International Journal of Solids and Structures, Vol. 15, pp. 669-685 (1979).
3.E. Corona, and S. Kyriakides, “ An Experimental Investigation Degradation and Buckling of Circular Tubes Under Cyclic Bending and External Pressure, ” Thin-Walled Structures, Vol. 12, pp. 229-263 (1991).
4.S. Kyriakides, and G. T. Ju, “ Bifurcation and Localization Instabilities in Cylindrical Shells under Bending-I. Experiments, ” International Journal of Solids and Structures, Vol. 29, pp. 1117-1142 (1992).
5.F. Paulsen, and T. Welo, “ Application of Numerical Simulation in the Bending of Aluminium-Alloy Profiles, ” Journal of Materials Processing Technology, Vol. 58, pp. 274-285 (1996).
6.W. 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).
7.E. Cornoa and S. Kyriakides, “ On the Collapse of Inelastic Tubes under Combined Bending and Pressure, ” International Journal of Solids and Structures, Vol.24, No. 5, pp. 505-535 (1998).
8.吳英豪，“塑性加工”，台南，復文書局，1983。
9.王同海，“管材塑性加工技術”，北京，機械工業出版社，1998。
10.F. Vollertsen, A. Sprenger, J. Kraus, and H. Arnet, “ Extrusion, Channel and Profile Bending: a Review, ” Journal of Materials Processing Technology, Vol. 87, pp. 1-27 (1999).
11.S. P. Keeler, and W. A. Backofen, “ Plastic Instability and Fracture in Sheets Stretched Over Rigid Punches, ” ASM Transactions Quarterly, Vol. 56, pp. 25-48 (1963).
12.G. M. Goodwin, “ Application of Strain Analysis to Sheet Metal Forming Problems in The Press Shop, ” SAE Technical Paper No. 680093 (1968).
13.勢流科技股份有限公司，LS-DYNA基礎課程上課講義，2003。
14.D. M. Friz, “ Alfried Krupp und Berthold Beitz - der Erbe und sein Statthalter, ” Orell Füssli, ISBN 3-280-01852-8 (1988).
15.I. M. Bernsten, D. Peckner, and R. Hill, McGraw, Handbook of Stainless Steels, New York (1977).
16.黃明彥，“不鏽鋼材SUS304 之橢圓杯引伸成形製程分析”，國立台灣科技大學機研所碩士論文，2007。
17.ASTM Standard, Designation：E646-93, “ Standard Test Method for Tensile Strain-Hardening Exponents (n-values) of Metallic Sheet Materials, ” Vol. 1402, pp. 558-564 (1996).
18.E. Rabinowicz, “ The Dependence of the Adhesive Wear Coefficient on the Surface Energy of Adhesion, ” Wear of Materials, ASME New York, pp. 36-40 (1977).