On this topic, are there equations (hand) I can use to calculate SIF's and flexibilty factors for a trunnion supported elbow? And if so, is it valid to apply these in my caesarII model? Right now I don't have access to FEA software.

I did find an interesting article by Dave Diehl in which he suggests an equation, but I'm not sure if it is applicable, and my situation does not pass the requirement: T ≤ t ≤ 2T
article is here:
http://www.coade.com/newsletters/oct02.pdf

Any suggestion of reference material or where I can look for answers would be greatly appreciated! I have read a ton of material and discussions (online) regarding this subject, but I still feel a bit lost and would appreciate some feedback from more experienced engineers.