Structural-to-structural co-simulation prerequisites

[alima2065]

Hi,

I need to do structural-to-structural co-simulation. I have a 2D frame as my explicit model and I need to couple this frame with a 3D joint as a submodel to study the behavior of the joint. I  defined three nodes as Abaqus/Standard co-simulation interaction points but I need some more info about this type of analysis as following:
1-The first question is that can model and submodel be defined in different dimensions or not? My main model (explicit one) is a 2d frame (3 coordinates)and the submodel (implicit one) is a 3d joint with 6 coordination. 
2- Is it possible that the submodel (implicit) does not have any supports(unstable structure). Actually boundary condition will apply from co-simulation interaction so I don't have any support to the ground in the submodel.
3- I tried some trials for co-simulation and when I did not use the Nlgeom option both models analyzed successfully however when I turned on this option,  the implicit model stopped at very initial stages (reached to many attempts). Can it be related to the second question (unsupported structure) or there is something else behind?
Thanks in advance for your help
Mohammad Ali

 

[FEA way]

I don't think you can do the co-simulation in different dimensions.

Which implicit step do you use for submodel analysis (general static or dynamic impplicit) ? You may have to use inertia relief to stabilize the model.

Geometric nonlinearity can cause convergence difficulties (not related to underconstraint) in some cases. Make sure that all settings of the analysis are correct.

 

[alima2065]

Hi,
I am using a static step in an implicit model. I will check using inertia relief with that. Thanks