There are some options but if you want a fringe plot of a custom result/measure I am not aware of this capability in Creo Simulate. First of all the idea or concept of Stress indices would only be valuable for the case of linear analysis because otherwise you could not assume that the result would apply to any other load. With this in mind if you apply a unit load, you will have the result of Stress indices when you plot the stress. I often do this for clips and then do a hand calculation to determine the load to yield, then re-run at that load to confirm. Another option is a custom measure based off a stress measure, but this would refer to a specific location or the maximum stress in the part or selcted geometry. It would not show a fringe plot for the entire model. Also I think you would likely have to manually put the load applied into the custom measure formula. There are probably ways to tie the load to a parameter so it automatically updates the measure and the load to the same load value but that seems overkill to me.
