Learning Forum

[zlsiegel]

I have a model of a two glass plates with a vacuum chamber inside. I'm trying to determine the deflection of and stresses in the glass under ambient pressure. The challenge for me is how to constrain the model. In reality the assembly will be sitting on, but not fixed in any way to, a table. I got the simulation to converge using remote displacement constraints at the corners - this shows roughly the deformation behavior I expect - but the maximum stress occurs right at one of the corners where the remote displacement is defined, so I suspect this may be an artifact. Is there a way to constrain the model in a way that's closer to reality to avoid these artificial stress concentrations?

LAPPD_glass.wbpz

[peteroznewman]

If the geometry and loads are symmetric, create three planes through the center of the part and slice it up and delete 7/8 of the geometry. Put Symmetry on the three cut planes. That completely holds the parts while the pressure deforms it.

[zlsiegel]

Hi Peter The geometry is only symmetric about two of the three principal planes. The top and bottom plates are different. I could slice it up and delete 3/4 of the geometry, but I think I'd still have the issue constraining top and bottom halves vertically.
Zack