Sandeep Medikonda
Ansys Employee

The error is quite evident. You can't have 2 flow rules/yield surfaces definedĀ in the same material model...


From the help:



The Anand option offers a unified plasticity model requiring no combination with other material models.



https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v195/ans_mat/rate.html%23matanandoption


https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v195/ans_thry/thy_mat2.html


If you want to model complicated material behavior, maybe a user-defined material subroutine is a better route for your application?


https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v180/ans_mat/matcustommatmods.html