I've been modeling a part in sw that might be best with nitinol- I'd like to use cosmos as a reference but I can't find nitinols material data anywhere...anybody got any ideas?
Depending on what you are trying to do, you aren't likely to find much information around on nitinol. Most of the actual formulations are either proprietary or well guarded. Since the percentages of the constituents as well as any processing completely changes the properties of the material, any material data you get will probably not really work if you are trying any sort of FEA analysis. If you are just looking for density and weight calculations in SW, then matweb should be sufficient.
Nitinol's modulus of elasticity is highly nonlinear. I don't think you'll be able to use the data on matweb for any meaningful analysis. Depending on which Cosmos package you have it may not handle non-linear material properties even if you knew them.