Is there a way (aside from contouring von Mises stress) to contour which elements have yielded throughout a nonlinear analysis in FEMAP? Contouring von Mises stress seems a bit innacurate, as I have elements which are slightly (1 or 2 MPa) under Sy = 355 MPa which are clearly within the yielded region.
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I didn't quite understand your question entirely, but if you are asking is there a way in Femap to plot only elements whose stress values are above a certain criteria (in your case Fty i.e. Yield), then the answer is Yes. Use the Criteria method in post-processing under Contour-> Style->Criteria. There you should find an option to set limits. I have included a picture to illustrate the above.
In my case, I have selected the method as "Above Max" and set the value as 1300. Only elements whose stress value is above 1300 is displayed by Femap.
Similarly, you can set the limit value as Fty (or Sy) and plot only elements who Von Mises values exceed the criteria.
Hope the above helps.
f you've defined the nonlinear material using a Stress vs Strain curve, display a contour plot or a criteria plot of the Plastic Strain. Any element that yields should have non-zero value for Plastic Strain as shown below.
This actually answers a question I posed a few days ago about transparency in contours. Very nice.
Can you please post it there as well so that people googling this in the future can find it? I will accept it as an answer (currently unanswered) if you do. Thanks!