I found some interesting articles w.r.t bike geometry, handling, tube shaping and butting.Finite-Element Structural Analysis: A New Tool for Bicycle Frame Design, Leisha A. Peterson and Kelly J. Londry, 1986
SImple Finite Element analysis of cycling frames and load cases. Basically explains why your downtube has to be big and strong, and why you can shed weight on your seat stays.Article from Seven cycles on tube butting and shaping
Round tubes are still the strongest when dealing in torsion. Ovalising a tube trades off strength in torsion for increased strength in (one plane) of bending.Article from Habernero cyclines (another Titanium builder) on tube butting and shaping
Makes similar comments on tube shaping, as well as maintaining that often ovalised tubes are created for ease of assembly/welding as opposed to direct performance benefits.
Have been reading other articles on Carbon fabrication (mainly on weight weenies) and some people comment that 'carbon has yet to really take off in terms of bicycle manufacture', whereas 'steel/titanium/aluminium have hit the wall in terms of development'.
I'd disagree with that, and say that carbon hit the wall when the UCI banned Lotus-style monocoques and enforced the 'two triangle' frame shape. As long as you are essentially joining carbon tubes together (which all the carbon manufacturers) do IMO you aren't really tapping into the real benefits of using carbon from a strength/weight view.
I wonder when a major frame manufacturer is going to bite the bullet and say 'stuff it, we'll just build the best bikes we can'. Unfortunately anyone with an interest in racing (from pros down to club racers) wouldn't be able to race them. Why a single organisation can in the 21st century essentially dictate the way all bicycles in the world can be constructed is quite beyond me, but I guess that's a question for another thread.
Can you imagine a similar organization having the same amount of impact on automotive design?
Of course, I shouldn't just presume that carbon builders are the one who can take advantage of non UCI bike regulations