There is sometimes need to produce Fringe plots with user defined content in the Creo Simulate post-prosessing.
Computed measure functionality on can be used to calculate user defined measure results. Unfortunately today it can be done only per point rather than fringe plots. One can combine this with Behavioural modelling (Field points, User Defined Analysis) for the required results, but computation time is HUGE.
Hill-48 yield function (non isotropic VonMieses)
ASME BPVC.VIII.2-2015 section 5.3.2 (combination of primary stresses)