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P1 and P2 principle stresses and strains for linear study versus Vonmises tensot plot

Question asked by Neil Grant on Jul 22, 2013
Latest reply on Jan 15, 2014 by Jared Conway

A couple of questions.  I would have assumed the P1 principle stress and the big tensile stress in the vonmises tensor plot to have the same magintude and direction.  Seems they do not.  Also, I would expect P2 to be perpendicular to P1.  Seems it is not with a vector plot.  I am going to mesh it a little fineer with more mesh control at the split line where the gauge is and see if that makes more sense,

I am trying to compare strain gauge results with a rosette strain gauge to FEA results in a failry low gradinent area.  What is the best way to show the two principle stains/stress as found on the surface?  I believe there should only be two on the surface.