Analytical prediction of forming pressure for three-layered tube hydroforming

Tube hydroforming is a special manufacturing process that uses high-pressure fluid to flow the material into a die cavity. This process has been used mostly in automobile and aerospace industries. Compared to the conventional metal forming processes, it has the advantages of weight reduction, less tooling cost, fewer secondary operations, and improved structural strength and stiffness. In special working environments, multi-layered tubes with combined material properties, high strength, and corrosion resistance are required to satisfy conflicting requirements. In this study, an analytical model for predicting the forming pressure range of a three-layered tube is developed and experimentally verified. Fundamental theories for calculation of the pressure for the inner, center, and outer tubes are proposed. Forming pressures are obtained from equilibrium equations for the action and reaction forces on the contacting walls of the tubes. In order to validate the proposed model, free bulge experiments are performed with stainless steel/aluminum alloy/copper alloy and stainless steel/carbon steel/copper alloy three-layered tubes. The measured forming pressures are in reasonable agreement with those obtained from the analytical model.

[1]  Ping Xu,et al.  Forming mechanism of double-layered tubes by internal hydraulic expansion , 2004 .

[2]  Lihui Lang,et al.  Multi-layer sheet hydroforming: Experimental and numerical investigation into the very thin layer in the middle , 2005 .

[3]  Beom-Soo Kang,et al.  A prediction of bursting failure in tube hydroforming process based on plastic instability , 2006 .

[4]  Abdul-Ghani Olabi,et al.  Feasibility of multi-layered tubular components forming by hydroforming and finite element simulation , 2006 .

[5]  Muammer Koç,et al.  Hydroforming for advanced manufacturing , 2008 .

[6]  Jaeho Jang,et al.  Investigation on the Hydroforming Characteristics of Double‐layered Tubes , 2008 .

[7]  Gracious Ngaile,et al.  Analytical model for planar tube hydroforming: Prediction of formed shape, corner fill, wall thinning, and forming pressure , 2008 .

[8]  Farid R. Biglari,et al.  Influences of inner pressure and tube thickness on process responses of hydroforming copper tubes without axial force , 2010 .

[9]  Abed Alaswad,et al.  Finite element comparison of single and bi-layered tube hydroforming processes , 2011, Simul. Model. Pract. Theory.

[10]  Spyros A. Karamanos,et al.  Mechanical behavior and wrinkling of lined pipes , 2012 .

[11]  Young Hoon Moon,et al.  Experimental and numerical investigation of an adaptive simulated annealing technique in optimization of warm tube hydroforming , 2012 .

[12]  Young Hoon Moon,et al.  Process analysis of two-layered tube hydroforming with analytical and experimental verification , 2013 .

[13]  Chester J. Van Tyne,et al.  Discrete layer hydroforming of three-layered tubes , 2013 .

[14]  Jongsup Lee,et al.  Effect of Surface Roughness on the Bonding Interface Properties of Hot-Pressed Cu/Al Clad Material , 2013 .