Numerical and Experimental Study of Tube Hydroforming for Aerospace Applications

Abstract:

In the tube hydroforming (THF) process, a pressurized fluid is used to expand a thin walled tube inside a closed die in order to fill the die cavity. THF has many advantages that render this process interesting for different industries such as automotive and aerospace. In this work, to investigate the effect of different process parameters, such as the friction condition, tube thickness and end-feeding on the final product, THF experiments were performed on stainless steel 321 (SS 321) tubes using a round-to-square die. Experimental loading paths were obtained via the data acquisition system of the hydroforming press, which is fully instrumented. An automated deformation measurement system, Argus®, was used to measure the strains on the hydroformed tubes. The THF process was simulated using Ls-Dyna software. The variation in the strain and thickness measured from the experiments were compared to the simulation results at critical sections. Comparison of the results from the finite element (FE) simulations and experiments showed good agreement, indicating that the approach can be used for predicting the final shape and thickness variations of the hydroformed parts for more complex shapes in aerospace applications.

• Periodical: Key Engineering Materials (Volumes 554-557)
• Pages: 1779-1786
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.554-557.1779
• Online since: June 2013
• Authors: Saeed Mojarad Farimani, Henri Champliaud, Javad Gholipour, Jean Savoie, Priti Wanjara
• Keywords: Aerospace Alloys, Finite Element Analysis (FEA), Tube Hydroforming

References

[1] F. Dohmann, Introduction to the process of hydroforming, Hydroforming of Tubes, Extrusions, and Sheet Metals, in Proceedings of the International Conference on Hydroforming. K. Siegert (1999) 1-22.

[2] F. Dohmann and C. Hartl, Hydroforming - a method to manufacture light-weight parts, J. of Materials Processing Technology. 60 (1996) 669-676.

DOI: 10.1016/0924-0136(96)02403-x

[3] M. Ahmetoglu and T. Altan, Tube hydroforming: state-of-the-art and future trends, J. of Materials Processing Technology. 98(2000) 25-33.

DOI: 10.1016/s0924-0136(99)00302-7

[4] F. Dohmann and C. Hartl, Tube hydroforming—research and practical application, J. of Materials Processing Technology. 71(1997) 174-186.

DOI: 10.1016/s0924-0136(97)00166-0

[5] B. Carleer et al., Analysis of the effect of material properties on the hydroforming process of tubes, J. of Materials Processing Technology. 104(2000) 158-166.

DOI: 10.1016/s0924-0136(00)00530-6

[6] Y.-M. Hwang and W.-C. Chen, Analysis of tube hydroforming in a square cross-sectional die, Int. J. of Plasticity. 21(2005) 1815-1833.

DOI: 10.1016/j.ijplas.2004.09.004

[7] G.T. Kridli et al., Investigation of thickness variation and corner filling in tube hydroforming, J. of Materials Processing Technology. 133(2003) 287-296.

DOI: 10.1016/s0924-0136(02)01004-x

[8] Ansys Documentation. Version 8.1—Chapter 3, Element Library, ANSYS LS-DYNA user's guide, ANSYS Inc, Chapter 2, Element.

DOI: 10.1016/b978-0-12-812981-4.00021-6

[9] LS-DYNA keyword user's manual, version 960, vol. 2. Livermore Software Technology Corporation.

[10] M. Saboori, Study of True Stress-Strain Curve after Necking for Application in Ductile Fracture Criteria in Tube Hydroforming of Aerospace Material, Key Engineering Materials, 504 – 506(2012) 95-100.

DOI: 10.4028/www.scientific.net/kem.504-506.95