Axisymmetry using Patran

[Amelie2004]

I am trying to model an axisymmetric model using Patran. I have been using CTRIAX element, and I've drawn the model in the x-z plane, so that the part is rotating around the z-axis. The part is quite simple (similar to an empty tube with an inside pressure) however, when I applied the pressure, without any others bc or contraints, the model does not work. I am using NASTRAN as the solver. Do you have any tips?

 

[franc11]

Not that I'm an expert, but what do you mean by it doesn't work? Is there an error message in Patran? A fatal error in Nastran? Or just it gives you crazy results?

 

[Amelie2004]

I obtained crazy results!! But I realized what I did wrong: the z-displacements were not correctly contraints. Thanks for the help!