The analysis (2D axisymmetric with Abaqus/Standard) has the aim to assess the structural and thermal behavior of a component subjected to mechanical and thermal loads. The design includes a "non-conventional" O-ring which I would like to model using the pressure penetration interaction. In order to do so I have partitioned the outer surface of the OR and after a first static step dedicated to the resolution of the interference fit, a transient coupled temperature-displacement analysis takes place, followed by a another transient analysis where the system evolves towards the equilibrium condition. In the first step the pressure penetration has been defined between the left wall and the left side of the OR, same for the right side, and the interaction seems to work properly. However, during the equilibrium step, when no load is present, the solver tends to diverge once reached a certain time (typically 10s/300s). After a deep investigation, it seems that the only way to solve this issue is to remove the right-side pressure penetration interaction. However, I do not find any correlation between this and the equilibrium step, where both of the pressure penetration interactions are deactivated. Indeed, the deformed structure behaves in the same way and anything seems physical.
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