When you are using a highly deformable material you will no longer be able to reasonably utilize linear elastic static assumptions. You should probably switch to a non-linear study.
Thanks for the input. I considered that and will try that next but with these forces and dimensions I should still be well within the linear portion of the material properties.
Should I be doing anything else with the way the force is applied? Is there a way to adjust the length of time a force is applied for?
What value are you using for Poisson's ratio (since it looks like you have Young's Modulus about right)? Since SW doesn't seem to come with PEEK properties I presume you set your own up.
Why did you use the large displacements switch?
The part is fully constrained at the bottom, correct?
What is the size of the part? If you are getting deflections > approximate minimum geometry size you have stepped outside the 'linear' realm.
Is your 100 N force total or maximum (i.e. much greater on the edge than towards the middle of the part)?
Do you get the same deflection value when you change the material to steel?
Did you change the material in the Simulation tree (lower window) or in the Model tree (upper window)? When you change it in the Model tree it does not transfer to the Simulation tree.
Actually no this version of SWX came with PEEK already in the library unless that was a carry-over but I'm pretty sure I wiped everything and installed this version fresh because we were having some problems with the license. Poisson's ratio is 0.4. Screenshot of the material properties attached.
I used the large displacement switch just because it seemed to compress slightly more but honestly I have no idea what that switch is for.
Correct, the part has a "Fixed" fixture applied at the bottom surface. You should be able to see the constraints in the first image in the post.
The outside dimensions are 12mm x 15mm x 5mm high.
The 100 N is total on the surface. Yes it increases linearly from the front of the part to the back. The way SWX applies force "Per item" I believe that means if you were to integrate the force on the top surface it would come to 100 N total.
The deflection decreases when I change the material to steel. But your next comment surprised me then because I've been changing the material in the upper tree ... Okay now when I change the material in the bottom tree to Natural Rubber I get an "excessive displacement" error and the solver fails. Maybe that's what I was doing wrong. EDIT: With natural rubber the solver fails even when I decrease the load to 1 N.
Speaking of the lower tree, when you change the materials there some of the properties are in Red and some are in Blue. What does that mean?
Still even with PEEK it doesn't seem to be displacing as much as I'd think. With 100 N the max displacement is 0.0034 mm and when I make the force 1000 N the displacement goes up to 0.034 mm. Maybe that's about right?