Useless to us now
Buckling (talk to Dr. Tustaniwskyj, he seemed to have a good understanding find a good reference)
Use Roark’s book for buckling analysis https://goo.gl/N5uRCJ
Buckling:
Critical buckling stress seems to be proportional to the Modulus of Elasticity, and inversely proportional to Poisson’s Ratio squared.
For a stepped beam, use table 15.1 of Roark’s. Section b would most likely be the case to use, as it assumes both ends are pinned but not fixed.