Learning Forum

[matteo.cova]

Hi. I am modeling powder compaction using the Extended Drucker Prager\Cap material model. The material of interest exhibits a so called "elastoplastic coupling", meaning the elastic properties (young modulus and poisson's ratio) are not fixed but dependent on density, which varies during compaction itself. One can think of it as an elastic hardening. This behavior can be addressed in Abaqus, since it gives you the power to define material properties as a function of other variables: for example, as to define a work-hardening curve, stress can be given as a function of equivalent plastic strain. Is there a way to do that in Ansys as well? from the documentation i could only find the tbfield command but it seems it can only describe properties as function of time or position in space. 

Thank you for your time

[John Doyle]

You are on right track with TBFIELD.

TBFIELD supports user defined variables (UF01 thru UF09).  You can edit any initialized user defined field variable via UserFld subroutine.  Please see Section 9.2.1 of the MAPDL Material Reference Guide as well as Section 2.4.14 of the MAPDL Programmers Reference Guide.