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.
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.
Does anybody have tips or solutions to this problem?
Thank you in advance.
Kind regards,
Bart
Actually if the model is created if you import model to ansys workbench module,if there is any connections it will show directly the contact region.
Hi,
Try using multi-body parts (build a part with several bodies). Doing so, the bodies will share the nodes and no contacts will be necessary. ASME VIII Division 2 Part 5 has design criteria and ASME PTB 3 has some examples of application.
But instead of using FEM you can establish maximum allowable working pressure using ASME VIII Division 1 Appendix 13 rules (design equations) that apply for vessels of non circular cross section. ASME PTB 4 has examples for such rules application.
Best regards.
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