Due to very large elastic and plastic deformation exhibited in this type of problem, a hyperelastic-plastic billet material is recommended.

You can experiment with material models other than Neo-Hookean and bilinear isotropic hardening; however, some parameters may require adjustments to reach convergence for a given fluid-pressure loading.

Use fillet on the die corners to facilitate material flow.

Element deformation in the cylinder portion of the billet is expected to be more in the axial direction; therefore, the element size should be larger along the radial direction than the axial direction.

Set KEYOPT(2) = 3 on CONTA172 (Lagrange and penalty method) to maintain low penetration during deformation.