Hi Erik and Peter, thanks for the reply!

I had already seen the video that Erik sent. It was really helpful indeed, but I am afraid it did not solve all of my problems hehe. But I am happy to hear that I may be walking the right path.

Peter, this is part of much more complex assembly, which is a High Pressure Cell to be used in spectroscopy experiments. What I am trying to simulate is a diamond window to be used within this cell, but initially I want to know only if the window itself would withstand the high pressure of 1GPa. I have some analytical models and I would like to compare the analytical results with the simulation. This leads to my next question:

Although the diamond window dimensions (Diameter = 5mm and Thickness = 1 mm) are not exactly compatible with thin plates modeling, I am using those equations thinking that I may acquire a more conservative results from it. In Ansys, I am now exploring the approach of modelling again only the diamond (orange) as a surface, and perform the calculations with shell elements and boundary conditions applied to the edges. Is there any recommendation on the use of shell elements in terms of dimensions? Is it ok to continue like that?

And trying to answer the second part of your comments, I am not yet sure if the parts are going to be glued together or not. Another possibility would be "guiding" the external diameter through a well machined hole. I understand this choices as, for example, having the window simply supported (without glue) or with fixed ends (glued), which changes the boundary conditions (for both the analytical and Ansys model). So my idea is compare this two situations to see if the maximum stress would reach the yield strength of diamond.

Any comments on these?

I hope I could clarify a bit more :)