I'm working on an analysis that followed from another post that I have made earlier:
Thanks to the solution posted there I was able to model the desired behaviour. However, now I am running into some new problems and I would be greatly helped if someone knew how to handle this. I have attached my model for reference.
I want to model three sheet bodies that are connected by crease lines (crease line modeled with constraint equations). The middle sheet has a bending actuator attached to it. The bending actuator consists of a rubbery matrix material with embedded SMA wires (SMA wires attached to matrix with constraint equations, modeled with orthotropic thermal expansion). I've modeled a quarter of the whole as the setup is symmetrical (it will represent a sort of "sheet body gripper" in the end). In order to get the model to actually fold the crease, a few auxiliary loads were used to "nudge" the model into the right position. In the steps following what I have now, I want to remove all the "nudge"-loads as they should not appear in the analysis, further increase the temperature and apply a load to the tip of the gripper to simulate grabbing something,as shown in the illustration. In the end I want to analyse the force-deflection behaviour of the tip.
When trying to remove one of the nudge loads and further increasing the temperature, the analysis is not able to converge no matter how small I make the substeps. I've attached the unconverged model to this post. It seems some elements start to warp a lot as shown in the screenshot below (the matrix element in the middle is starting to warp). I can't figure out why the analysis does not continue. So my question is if anyone has an idea to make this analysis more robust?
Thanks in advance!