Reaction forces on a rigid body during compression test 2

[mdama]

I have a rigid punch (defined regid by constraint rigid and a refernce point) to apply compression on a structure. I want to get load-displacement curve. In order to get force, I define a set for the whole punch and ask for force history output. This force is actually reaction force applied to the structure. My question is that by doing this, I get zerp force. I am wondering if I should define the set just for the refernce point instead of whole punch??
Or something else might went wrong!!

 

[Erik Panos Kostson]

If you have a displacement constraint on the rf (reference p.) or enforced displacement then you can get probably reactions there (rf).

If the bc are different say velocity then perhaps not (I tried on rf and it works of course),

 

[FEA way]

Reaction forces and moments for rigid bodies can only be read at the reference point for the directions that were constrained with BC. But I think that you may also be interested in the contact force output CFN.

 

[mdama]

I choose the whole bottom surface of the the rigid punch that is in contact with the sructure below but I get zero reaction forces. This time, I try to pick only refernce point to see!