Implementing Drucker-Prafer Yield Criterion

[ALEXANDROS STATHAS]

In the fortan files I have seen the Drucker-Prager yield criterion for plasticity. In the manual it's not specified how one can implement this model. There is no mention concerning the input arguments that should follow the input statement DRUC. Is it possible to provide information on this?

[Prof. R.L. Taylor]

The parameters for each yield function are found in the "inmate.f" routine  ./elements/material -

See format 2057.

The input is: PLAStic DRUCker sigt sigc

where the sigt and sigc are uniaxial yield in tension and compression