aluminum vs. steel in brake disc
You need to calculate or determine
-The amount of energy that the rotor will absord for each braking event, how much speed will you loose how quickly. and how heavy the vehicle in question is
-how frequent these event will be
those two factors will obviously change depending apon the trial cruict the FSAE people set you but you should be able to make an estimate of the fiqures required
-Determine how much of that energy will go into the pad howmuch will go into the rotor, this data is available don't ask me where but i found it once.....
-using these factors you can work out how hot the rotor will get by using the energy into it, the specific heat capacity and the rotor's mass. I'd sujest treating the system as a single point mass and not worring about the heat being applied to one section of the rotor at a time to start with.
-You should also look at the cooling effects of air circulation on the rotor and pad, don't neglect the pads or you will end up with pads on fire which is always nasty!
Their are a number of SAE papers on computer modelling of brake rotor system give them a read to see how others do it. but i'd suggest that the limit for an FSAE car is t structral rather than thermal