How to create sliding between two cylindrical tubes in Abaqus? 1

[StructuralCivilFEA]

I want to fix the outer tube, but not restrict the inner tube so that it is only restricted by the coloumb friction caused by the contact with the outer tube. When I apply boundary conditions to only the outer tube the solution does not converge. I am using penalty friction formulation.

 

[FEA way]

You may have to fix the inner tube in other directions to avoid rigid body motions. Another way would be to use inertia relief or soft springs/discrete dashpots. How does this structure work in real life ?

 

[StructuralCivilFEA]

Its supposed to be a wind turbine - grouted joint connection. I have just started working on it, there are three components, two steel tubes and concrete inbetween. I need to model the sliding and normal contact inbetween the three componenets.

 

[IceBreakerSours]

Is the solver struggling to converge the first increment? If yes, the solver is having trouble to establish contact at the outset so it thinks bodies are free (i.e., rigid body motion). Do an eigenvalue analysis at t=0 and you will see those modes appear.

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[FEA way]

Can you attach more pictures of your model - one showing boundary conditions and loads and one showing meshed geometry in the front view (the one where cylinder base is visible) with perspective off ? It’s necessary to determine whether the cylinders are initially in contact or there’s a gap between them. The way this model is constrained and loaded is also very important.

 

[StructuralCivilFEA]

Have just applied gravity load on the entire model

Boundary condition (encastre) is applied only to outer tube

 

[FEA way]

So you assume that only contact friction blocks the inner pipe from sliding out due to gravity and you want to simulate this sliding. In such case I think that it would be better to use dynamic implicit analysis. But first make sure that contact between the cylinders is properly established (no gaps). You can use output variables such as CSTATUS for this purpose.