New strategy for the prediction of the gas pressure profile of superplastic forming of al-5083 aluminium alloy
Otegi, Nagore ; Galdos, Lander ; Hurtado, IƱaki ; Leen, Sean B.
Otegi, Nagore
Galdos, Lander
Hurtado, IƱaki
Leen, Sean B.
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Publication Date
2012-12-01
Type
Article
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Citation
Otegi, Nagore; Galdos, Lander; Hurtado, IƱaki; Leen, Sean B. (2012). New strategy for the prediction of the gas pressure profile of superplastic forming of al-5083 aluminium alloy. Materials Science Forum 735 ,
Abstract
This paper describes a new approach for identification of the optimum pressure history for SPF processes, based on mechanisms-based hyperbolic constitutive equations. This equation set has been modified to incorporate the effect of the damage behaviour the material suffers due to the cavitational evolution of Al-5083 superplastic alloy. A large deformation, multiaxial formulation of the constitutive equation set is implemented and applied to finite element modelling of a bulge test forming process to characterise the cavitation evolution behaviour in the bulge test, using conventional (constant strain rate) and the newly proposed (variable strain rate) strategy.
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Publisher
Trans Tech Publications
Publisher DOI
10.4028/www.scientific.net/msf.735.204
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Attribution-NonCommercial-NoDerivs 3.0 Ireland