Material Superplastic Parameters Evaluation by a Jump Pressure Blow Forming Test


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In this work a method, based on bulge tests performed on a blow forming equipment, for evaluating the superplastic material characteristics is proposed. The pressure imposed on the sheet and the height of the dome of the specimen during the test are used as characterizing parameters. Different pressure levels are applied subsequently in the same test and the strain rate sensitivity index is calculated starting with analytical considerations and then with an inverse approach based on a simple finite element numerical model of the test. The change of the slope in the specimen dome height curve, due to the change of the pressure, is correlated to the strain rate in the sheet. The method has been verified applying other load profiles on the sheet and good agreement has been found between experiments and numerical results obtained by the inverse analysis.



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Edited by:

F. Micari, M. Geiger, J. Duflou, B. Shirvani, R. Clarke, R. Di Lorenzo and L. Fratini




D. Sorgente et al., "Material Superplastic Parameters Evaluation by a Jump Pressure Blow Forming Test", Key Engineering Materials, Vol. 344, pp. 119-126, 2007

Online since:

July 2007




[1] N. Chandra, Constitutive behavior of superplastic materials, International Journal of NonLinear Mechanics 37 (2002) 461-484.

[2] D. Sorgente, L. Tricarico, Analysis of Different Specimen Geometries for Tensile Tests in Superplastic Conditions for an Aluminium Alloy, 9th International Conference on Superplasticity in Advanced Materials (2006).


[3] A.W. El-Morsy, K.I. Manabe: FE simulation of rectangular box forming using material characteristics from the multi-dome test, Journal of Materials Processing Technology 125-126 (2002) 772-777.


[4] L. Carrino, G. Giuliano, W. Polini, A method to characterise superplastic materials in comparison with alternative methods, Journal of Materials Processing Technology 138 (2003) 417-422.


[5] F. Jovane, An approximate analysis of the superplastic forming of a thin circular diaphragm: theory and experiments, International Journal of Mechanical Sciences 10 (1968) 403-427.


[6] J.H. Cheng, The determination of material parameters from superplastic inflation tests, Journal of Materials processing Technology 58 (1996) 233-246.


[7] G. Palumbo, D. Sorgente, L. Tricarico, S.H. Zhang, W.T. Zheng, L.X. Zhou, L.M. Ren, Numerical-Experimental characterization of a superplastic AZ31 magnesium alloy, 9th International Conference on Superplasticity in Advanced Materials (2006).


[8] D. Sorgente, L. Tricarico, Characterizing a superplastic AA5083 alloy by the blow forming technique and numerical finite element analysis, Proceedings of CAM3S Conference (2005) 888-894.

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


[10] W.J. Kim, S.W. Chung, C.S. Chung and D. Kum: Superplasticity in Thin Magnesium Alloy Sheets and Deformation Mechanism Maps for Magnesium Alloys at Elevated Temperatures, Acta Materialia. 49 (2001) 3337-3345.


[11] D.L. Yin, K.F. Zhang, G.F. Wang, W.B. Han: Superplasticity and cavitation in AZ31 Mg alloy at elevated temperatures, Materials Letters 59 (2005) 1714- 1718.


[12] G.R. Liu, X. Han, Computational inverse techniques in nondestructive evaluation, CRC Press (2003).