Hello!
I'm working on a project where I'm deforming a hyperelastic frame in different ways and matching it against a prototype to determine which simulation is most valid. I've already done one where I pull the frame down from the top edges using enforced motion, and am working on a contact based one where the frame is pressed against a flat plate(see the setup on the left). So far I've been able to get it to solve, but there are some oddities with the solution that make me question it's accuracy.
The solutions that solve keep a gap between the surface and the tip of the "flap" on the frame. This makes me think that I improperly configured the contact settings. The contact settings currently are between the bottom of the plate and all top faces of the frame (from the round tip of the flat to the fillet on the right side of the top of the frame). Furthermore, the flap barely deforms and the part with ridges never even gets close to the top of the plate, while on the physical model it lies almost flat with the plate. While the SPC summation of forces almost match in the models, unfortunately part of the design criteria involve aesthetics so the accuracy of the deformed shape is very important.
While attempting to modify the contact settings, I've encountered 3 different situations (excluding errors). The first is that the bottom face will buckle without any load being transferred to the rest of the frame. Secondly, the frame will traverse the gap and impact the plate. At this point the load gets transferred to the plate in a non-uniform fashion though 3 or so "hotspots". Lastly, the gap will remain but the frame will fold as designed.
I feel like I've missed something pretty obvious, and any help would be appreciated! Let me know what other information I can provide to help you diagnose the issue.
Solved! Go to Solution.
Solved by John_Holtz. Go to Solution.
Hi @Anonymous . Welcome to the Inventor Nastran forum.
It would be best if you could attach the model and let us know what version you are using. That way, readers that have the same version (or newer) can open the model and get a better understanding about what is occurring.
Here are the steps to create a pack-and-go file of the Inventor model. (The Nastran input is saved in the part or assembly file.) Attach the zip file to your forum post.
Based on the video by Roelof Feijen
Alright, I've attached what I got out of it. And I'm using the 2020 version of Inventor Nastran.
Hi,
Here are my suggestions. Note that I used Inventor 2022 (because I had other things open at the same time) and cut the model to be be 0.23 inches deep instead of the original depth of Z inches (to make a smaller model that runs faster).
The analysis is trying to run. I hope I did not make my contact Maximum Activation Distance too small for the amount of motion of the "flapper".
Thank you so much for your help. I've taken most of your suggestions and then did some other stuff to help it converge. Just for anyone else who ends up with a similar issue in the future:
Thanks again!
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