Sean Harvey
Ansys Employee

Hi Helen,

Just to close the loop. If you do try to change the nonlinear option, such as one plasticity model to another you will get this type of error.

 *** FATAL ***                           CP =     191.328   TIME= 14:33:48
 Change a nonlinear material model, 2, to another nonlinear material    
 model, 1, is not allowed for element type 186.