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Can I simulate flexible clamping using shrink fit contact and parts that interfere in the free state?

Question asked by Tim Rosenberger on Dec 12, 2014
Latest reply on Dec 18, 2014 by Jared Conway

I have a part that, when installed, is preloaded in bending by being clamped down, but has been modeled as a flat part for manufacturing purposes (as well, I'm not completely sure about the final shape, because the clamp is compliant, and also bends under the clamp load).  I have been asked to simulate the part and am trying to avoid using the non-linear module, because someone else here is typically needing that licence. 

 

I have created a few models to test various arrangements and techniques for doing this analysis, and shrink fit seems to achieve what I need to do in certain geometric configurations, but not others.

 

So my real questions is:  What sorts of "real" contact conditions have people made to work using shrink fit contact and the linear solver?  I got a successful run using parallel planes that had initial interference, but things broke down when I tried non-parallel planes, possibly because in the deformed shape the contact is between a surface and a line.  I intend to shortly try a "shrink fit" between a flat plane and a round surface (which is, again, theoretically line contact, but might work because there is tangency, where the non-parallel planes have no tangency.  I'll post back here with a report regarding how this turns out.

 

Files are attached: 

In "...Step2" run the study "Static 2-sym" this one worked, though in can fail if the interference is increased too much.

In "...Step3" there is only one study, and it failed.  I have tried tweaking a few things, and I either get virtually zero displacement/strain/stress or something insanely high, with the interference remaining in the deformed shape

 

If someone has made something like "...Step3" work, would you please share how you managed?

 

Thanks,

Tim

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