Thanks for your answer gravityandinertia.
About points 1 and 2 : we tried multiples variations of boundary constraints and both shell and solid elements. We went from coarse to fine-as-in-so-fine-the-computer-is-going-to-melt-down elements.
Point 3 is interesting, I found this article googling...
Hello everyone,
Let's first talk about my background in FEA : everything I learned I got it through colleagues, browsing software help and googling a lot. So, no official training nor advanced mathematics class doing matrix calculation to understand the basic theory behind FEA. I got a diploma...