Pressure Profile Optimization on a Superplastic Aluminium Alloy

Abstract:

In this work authors present a study of the influence of the pressure profile on forming time and on post-forming characteristics of superplastically formed parts. Material parameters of an aluminium superplastic alloy (ALNOVI-U) were estimated on the basis of experimental tests and of a numerical approach. A numerical model of the forming process was then created and used for evaluating the pressure profile able to keep the maximum strain rate value close to a target value. Pressure profiles were calculated using a strain rate control algorithm, firstly following a conventional approach and monitoring the whole sheet, and then considering only the elements most deformed at the end of the forming process. Experimental results from different numerical pressure profiles are then compared, in terms post-forming characteristics, to test the effectiveness of the approach.

• Periodical: Materials Science Forum (Volume 735)
• Pages: 383-394
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.735.383
• Online since: December 2012
• Authors: Donato Sorgente, Luigi Tricarico
• Keywords: Aluminium Alloy, Fe, Simulation, Superplastic Forming

References

[1] F. Jovane: An approximate analysis of the super plastic forming of a thin circular diaphragm. Theory and experiments, Int. J. Mech. Sci. 10 (1968) 403-427

DOI: 10.1016/0020-7403(68)90005-2

[2] H. Samekto, K. Roll: Finite Element Analysis of superplastic forming process using LS-DYNA, 4th European LS-DYNA Users Conference, Ulm, Germany (2003)

[3] D. Sorgente, L. Tricarico: A numerical-experimental approach to material characterization and process analysis in the blow forming process, EuroSPF 2008, Carcassonne, France (2008)

[4] L.C. Chung, J.-H. Cheng, Fracture criterion and forming pressure design for superplastic bulging Mater. Sci. Eng. A 333 (2002) p.146–154

DOI: 10.1016/s0921-5093(01)01818-4

[5] D. Garriga-Majo, R.J. Paterson, R.V. Curtis, R. Said, R.D. Wood, J. Bonet, Optimisation of the superplastic forming of a dental implant for bone augmentation using finite element analysis, Dent. Mater. 20 (2004) p.409–418

DOI: 10.1016/j.dental.2003.07.001

[6] M.A. Nazzal, M.K. Khraisheh, F.K. Abu-Farha, The effect of strain rate sensitivity evolution on deformation stability during superplastic forming, Journal of Materials Processing Technology 191 (2007) p.189–192

DOI: 10.1016/j.jmatprotec.2007.03.097

[7] Firas S. Jarrar, Louis G. Hector Jr., Marwan K. Khraisheh, Allan F. Bower, New approach to gas pressure profile prediction for high temperature AA5083 sheet forming, Journal of Materials Processing Technology 210 (2010) 825–834

DOI: 10.1016/j.jmatprotec.2010.01.002

[8] Khaleel, M.A., Johnson, K.I., Smith, M.T., 1997. On the thinning profiles in superplastic forming of a modified 5083 aluminum alloy. Mater. Sci. Forum. 243–245, 739–744.

DOI: 10.4028/www.scientific.net/msf.243-245.739

[9] Henry (Hong) S. Yang, A new light optical metallographic technique for revealing grain structures of common 2000, 5000, and 7000 series aluminum alloys, Materials Characterization, Volume 38, Issue 3, March 1997, Pages 165-175

DOI: 10.1016/s1044-5803(97)00040-5

[10] ABAQUS Analysis User's Manual, Version 6.9-EF, section 20.2.4 Rate-dependent plasticity: creep and swelling

[11] N. Ridley, P.S. Bate, B. Zhang, Material modelling data for superplastic forming optimisation, Materials Science and Engineering A 410–411 (2005) 100–104

DOI: 10.1016/j.msea.2005.08.108