Hi Henrique,
If the parts will eventually be glued together, is the stress without glue relevant?
Some adhesive materials are more flexible than the materials that they bond together. What type of glue are you using? What will be the thickness of the glue between the parts? To get accurate stresses, you will want to include the thin layer of glue between the parts in the simulation, and use 3 or 4 linear elements through the thickness of the glue.
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