[bjag]

Dear all,

For a project I am currently working on, the intention is that I calculate the maximum allowable pressure in a rectangular 'pressure vessel'. Of course this shape is not suitable for a real pressure vessel but in this case it is considered as such.

From CAD software I made a simplified model of the pressure vessel and loaded it (.stp) into ANSYS. When I apply pressure from the inside to all walls, the simulation only gives stresses in the upper plane and in side planes 1 and 2 (these sides are opposite to each other). I fixed the bottom side but the sides 3 and 4 don't show any stress or deformation, this is not how the real situation will be.

ANSYS1.jpg

Two 'warnings' come up when solving the simulation:

1. Two or more remote boundary conditions are sharing a common face, edge, or vertex. This behavior can cause solver overconstraint and is not recommended, please check results carefully.
2. One or more MPC contact regions or remote boundary conditions may have conflicts with other applied boundary conditions or other contact or symmetry regions. This may reduce solution accuracy.

It seems that the model is overconstraint but I am not sure how to model proper contact definitions for this model. The current situation is done by creating automatic connections between overlapping contact regions.

ANSYS2.PNG

Does anybody have tips or solutions to this problem?

Thank you in advance.

Kind regards,

Bart