The thing about Explicit Dynamics is it can take a long time to compute. I can show you results from this model in 2 days!
Pressure ramps up from 0 to 1 MPa at the end time of .010 seconds. The density of the balloon material has been set at an artificially high value to increase the time increment up to 3e-10 s.
The Mooney-Rivlin material only ran on solid elements, it did not run with shell elements. This is a 1/8 model, so the boundary conditions were very simple on the three cut planes.