The superplastic behaviour of a titanium alloy base Ti-6Al-4V during biaxial
test was investigated. A numerical model using a finite element method is
proposed to examine the superplastic deformation behaviour of an appropriate
axisymmetric shaped part. An experimental procedure based on the measurement
of the pressure applied and the height of the dome apex of the formed part,
is used to identify the rheological parameters of the material behaviour
law. This identification was carried out by comparisons between the results
of simulation and experimentation relating to thickness, equivalent strain
and stress. Three inflation tests were carried out at different equivalent
strain rates (4×10-4, 6×10-4 and 8×10-4 s-1).
This procedure is applied successfully to the forming of an industrial part.
Indeed, this study henceforth allows one to predict thickness evolution in
any point of an industrial part for an optimization of its uniformity.