25 February 2019
- Last edited 25 February 2019
I think Peter is on a well deserved vacation, so I will try and answer.
The revolute joint is blocking all dof except of the rotation (RZ), thus the applied force is cancelled out, thus not doing anything (by the dof restrains).
You could see this by plotting the displacements for the static analysis, and you will not see much going on.
Not sure how to overcome this - the only way I can think of is to model the springs at the end explicitly (just add two small line bodies at the end of the beam), restrain (extra line bodies that will be springs) them fully at their ends, apply force on the end of the beam, restrain the opposite beam end as needed, and on the same end as the force of course (not though the dof that is in the force direction of course), and that works. These two end line bodies are also converted to combin14 3D torsional spring elements. More details (including commands snippets) can be seen in the attached.
Normally one applies a pre load/stress, that keeps the supports where they are. In order to do that the only reasonable way is to apply a bolt preload, that works fine, and applies the pre tension say on the beam, something that should increase the freq. of say the bending modes.