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@Mikenetic
Thanks Apollo.
drøn, there's quite a lot of information out there related to finite element analysis of bike frames. Although it's quite old, there's a nice piece on Sheldon Brown's site, http://sheldonbrown.com/rinard/fea.htm and there are various other academic papers too. I've also picked up quite a lot from talking to various builders.
My comment was a bit flippant in hindsight - it's important that the seat tube/seat stay junction is well formed. The position of the joints on my frame mean that I can get plenty of braze around them to form a good strong fillet. Also, the seat tube reinforcing sleeve I added takes the wall thickness of that area to 1.6mm, which is pretty much double the thickness of the butted sections of the tubes.