Why Does ANSYS Extrapolate Stress Values Beyond Input Limits?

[Earth_2304]

I am running a non-linear analysis using ANSYS using multilinear isotropic hardening. The problem is that the value of maximum prinicipal stress I get on my model is greater than the max value in the table which I input. So I think ANSYS is extrapolating the values of stress on its own beyond what is permissible. Has anyone faced this issue? Any idea how do I resolve this?

Thanks!

 

[nvn]

Earth_2304: I currently think that is OK. I think it means your part is overstressed.