[Output] Reference point - Kinematic coupling

[Philippe_Chrt]

Hello,

I want to extract forces in a reference point of a kinematic coupling. I try with reaction forces but it doesn't work.
Reaction forces are only available for nodes with applied boundary conditions from litterature (if I understand correctly...).
And I dont' want to apply boundary conditions on a node which doesn't need it !


If you have an idea, a solution...thanks. Maybe to extract directly from elements of kinematic coupling ? With NFORC ?

 

[FEA way]

That's right, reactions are only available for constrained nodes. But what is the purpose of kinematic coupling in this case ? Do you use it to apply load ? If yes then you can request CF or TF output variable for this reference point.

 

[Philippe_Chrt]

Thanks for your answer.


1- In my case it is to make a simplified modeling of a bolt. I have created a kinematic coupling between two holes of linked plates.
So I need to extract forces on this coupling for an analytical checking.

2- If I do a more realistic representation of the bolt :
-> two kinematic coupling at each extremity of a beam / hole of the plate
-> pre-tension on the beam
-> output : section force SF ? It's that ?

 

[FEA way]

When it comes to modeling bolts using 1D elements, the best way is to place connector element between two reference points attached to the structure via couplings and read forces directly from the connector. There's a specialized output for that. It's also easier to apply pretension this way.