Another tip if you are dealing with something like this, is you can use *Mat_add_erosion, reference the material that is having the element issue, and...

Is the red air domain a solid? I'm not sure if it would work but you might be able to use *Contact_surface_to_surface_thermal and use segment sets bet...

Great question to a pretty complicated problem. I believe the limitation you're encountering with PolyUMod and restart files is a known constraint wit...

Some old threads on the topic

You need to include the elements you want to plot in *Database_history_solid. The strain flag allows you to plot fringe data but not plot strain.

Interesting. Yeah your units did look consistent though so I don't believe that was the issue. So now your simulation is outputting internal energy?

Sorry @richardp I meant to follow up on this. I saw you marked this topic as complete, did you resolve your issue?

I believe you can try *Boundary_prescribed_motion_rigid_local and make the edges of your part rigid and reference your local coordinate system in the ...

So the easiest error to debug is that part ID 2 has rigid nodes somewhere. I assume the part material isn't rigid, but maybe you have some CNRB or nod...

Gotcha. So you were able to solve your problem using *Boundary_prescribed_motion_rigid? Or do you also need to change your CNRB to constrained extra n...

Hmm kind of looks like the elements are hourglassing. What solid element formulation/hourglass control is your foam? It’s also a bit of a weird compre...

Okay so you have the rotation working correctly and now you just need to be able to extract the reaction moment? If that's the case, do you have the *...

There's a couple options for applying rotation to CNRB nodes in LS-DYNA explicit analysis: *BOUNDARY_PRESCRIBED_MOTION_RIGID instead of _NODE: ...

Can you provide more details on your simulation setup and your expected result? Quite a lot of things could be affecting the peak force of your sim.

If you internal energy is zero then there's something wrong with you model setup. My theory is that your units are messed up. What unit system are you...