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Possible to give a variable constraint in the design optimization?




I tried out the optimization in FEMAP/Nastran and was impressed by the efficieny and simplicity of the tool. I however forgot to check on important thing during the demo period - normally the critical buckling stress is not constant but depends (in my case) on the plate thickness as shown in the figure. Is there a way to define the buckling stress constraint as a function? 


I was thinking of the possibility of giving the constraint as a variable, which in turn would be defined as function of a certain property's thickness value. No idea if this works and the demo lic has expired, so if anyone has experience in this I'm very greatful!