how to design a model with multiple properties and UMAT

[vinnuram]

hey all,
I guess it's a small question for most of them.I actually wanted to know how could i design a 2d shell with inner part as viscoplastic and outer part as elastoplastic,a user subroutine UMAT is applied on this model.
I am actually trying to apply a user subroutine on a cell structure of a material in which matrix and unit cell are in elastoplatic region and the particle in the center is a viscoplastic.
Should i have to mention while giving the properties that these are viscoplastic and elastoplastic separately and should i have to just specify the USER DEFINED MATERIAL AND CAN I SPECIFY THE PROPERTIES IN THE SUBROUTINE....
PLZ LET ME KNOW..
VINNU ARIGE

[CF]

Vinnu:

I think you need to define two sections for the viscoplastic and elastoplastic regions, each having their respective user defined materials. In your user subroutine you need an if-then-else statement to call the appropriate umat subroutine, e.g:

if (trim(cmname) == 'InnerMatl') then
call umat_inner()
else if (trim(cmname) == 'OuterMatl') then
call umat_outer()
end if

Hope that helps.

Cormac