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So, revisited this when the customer liked the results, but says that I can't constrain the entire section of end. Apparently, the beam is riding against two ~1" pins - meaning it's supported at singularities.... So I'm back to not being able to get a result. Does someone have a good walk...

Oh! Actually making good progress. I got an error saying "use surface to surface" contact instead of node to surface, and after that and changing the solver, things seem to be going well. I still feel shells might be more appropriate (every element spans the thickness of the tube), but at least...

Thanks! That is certainly in the vein of what I am doing (was doing, am doing again - had to back burner that project for a while). Perhaps try to download the files I attached earlier? There are a couple changes: 1) My beam is fixed on both ends, bending in the middle 2) My beams have...

Slightly related question - does this seem like something worth using symmetry on?

Thanks. From what I read, the global no penetration is just a lot slower. :-) Mostly I've been staying away from it. I did a non-linear real quick and saw a difference in deformation between the two bars, so I feel I'm on the right track. That said, I like the idea of of the single bonded...

Shoot, non-linear keeps crashing out. With shells, I can't really get it started. Without them, it runs for an hour and complains things aren't tied down. This all makes sense, but not sure how to tackle it. Attached is the same assembly, with the non-linear study files...

Sure. If someone manages to take over the world by stealing THIS design, I'd be happy to be their subject. :-) This is just the basic model with two configurations for inner beam centered or resting against one wall. If you need more PM me your email and tell me what you need. Thanks...

If you'd prefer I'd be happy to send you mine so you don't have to work anything up.

Oh, interesting. I thought non-linear wouldn't let me assign no penetration! In real life, the beam is vertically (between windows in a tall building), and a bolt or otherwise will be slipped thought the outer channel to prevent the channel from falling. It really does "free float" in there as...

Small PS - The bar seems to move the wrong way - it's as if the arrows show the force 'coming out' of the surface, not going in. I get similar results when I leave the bar touching one side for initial conditions, FYI.

Thanks for getting back to me - I was starting to give up. I was hoping with this to get an idea for when my central beam would overstress it's shell and break through. With this simulation I get none of that. I have convinced myself that the times where the shapes flex independently and...

Sorry if this question is a little vague... I've got a customer who wants to stiffen a long aluminum rectangular tube with a short length of smaller bit of steel channel centered within it. I thought I'd run a quick sim to just see how it behaves... And I'm having trouble setting up the correct...

Just a quicky - while their suggestions for how to get your answer remain valid.... Look at your images - see the stresses listed? And see the yield strength? The steel is at 0.04% of it's yield strength, the plastic is nearly at half. Check out "factor of safety". Good luck.