material models and failure

[rubadee]

Hi,
I am confused by the material models given in Ansys wb. Why do structural steel and titanium both have 0MPa compressive ultimate strength? I have been trying to get my model (with yield, then ultimate failure strengths in the material model) to yield and then fail the way that it does when i use structural steel- but is this model correct? I keep getting non-convergence when i put ultimate failure strengths in.

Thanks