A posteriori optimisation of the forming pressure in superplastic forming processes by the finite element method
In order to optimise the superplastic forming processes, it is necessary to control the strain-rate induced in the material by the pressure gas. This control ensures high material deformability. In this paper, to determine the optimum pressuretime profile in superplastic forming processes, the authors will show an original technique based on finite element method. The proposed technique was tested with reference to the superplastic forming of a thin circular plate clamped in a rigid die and formed by a pressure differential. The experimental activity was carried out using a Pb/Sn-based metallic alloy. Final results of the finite element modelling agree with the experimental ones.
superplastic forming finite element optimum pressuretime profile experiment