2-D water pressure

[vladimir79]

Dear colleagues,

I have a plane strai problem that does not converge:

The model is a artificial material pipe (liner) which is inserted in another (host) pipe in order to sanate it.

The host pipe and the liner are close fit, so I modeled the connection with the gap elements with insignificant tensional stiffnes. The space betweent them is described with an initial gap of ~ 1,5 mm. Because it is a stability problem, I conduct a nonlinear static analysis, where the load is incremented to a double load.

Unfortunately, the analysis stops after 5 secconds.

I would be very happy if someone could help me get the model analysed.

You can find the model attached.

Thank you all in advance.


Vladimir

 

[jbrackin]

Vladimir,
The problem does not have sufficient constraints. These elements only have 2 dofs. Since it is a 2D problem use permanent constraints to constrain the out of plane motion and rotations. Next you only have x constraint for rigid body motion, since you built model in XY plane, I believe you will need a y constraint also.