Process analysis of two-layered tube hydroforming with analytical and experimental verification

다국어 초록 (Multilingual Abstract)

Two-layered tubular joints are suitable for special applications. Designing and manufacturing of two layered components require enough knowledge about the tube material behavior during the hydroforming process. In this paper, hydroforming of two-layered tubes is investigated analytically, and the results are verified experimentally. The aim of this study is to derive an analytical model which can be used in the process design. Fundamental equations are written for both of the outer and inner tubes, and the total forming pressure is obtained from these equations. Hydroforming experiments are carried out on two different combinations of materials for inner and outer tubes; case 1: copper/aluminum and case 2: carbon steel/stainless steel. It is observed that experimental results are in good agreement with the theoretical model obtained for estimation of forming pressure able to avoid wrinkling.

참고문헌 (Reference)

1 N. Asnafi, "Theoretical and experimental analysis of stroke-controlled tube hydroforming" 279 (279): 95-110, 2000

2 Ch. Hartl, "Research and advances in fundamentals and industrial applications of hydroforming" 167 (167): 383-392, 2005

3 Y. Aue-U-Lan, "Optimizing tube hydroforming using process simulation and experimental verification" 146 (146): 137-143, 2004

4 L. Lang, "Multi-layer sheet hydroforming: Experimental and numerical investigation into the very thin layer in the middle" 170 (170): 524-535, 2005

5 J. H. Jang, "Investigation on the hydroforming characteristics of doublelayered tubes" 79 (79): 371-376, 2008

6 A. Alaswad, "Integration of finite element analysis and design of experiments to analyse the geometrical factors in bi-layered tube hydroforming" 32 (32): 838-850, 2011

7 S. M. H. Seyedkashi, "Free forming analytical modeling of two-layered tube hydroforming and experimental verification" 2009

8 F. Liu, "Forming mechanism of double-layered tubes by internal hydraulic expansion" 81 : 625-633, 2004

9 A. Alaswad, "Finite element comparison of single and bi-layered tube hydroforming processes" 19 (19): 1584-1593, 2011

10 M. D. Islam, "Feasibility of multi-layered tubular components forming by hydroforming and finite element simulation" 174 (174): 394-398, 2006

11 N. Asnafi, "Analytical modelling of tube hydroforming" 34 (34): 295-330, 1999

12 A. Aydemir, "An adaptive simulation approach designed for tube hydroforming processes" 159 (159): 303-310, 2005