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# User subroutines.

Although the present software is protected by the GNU General Public License, and the user should always get the source code, it is sometimes more practical to get a nicely described user interface to plug in your own routines, instead of having to analyze the whole program. Therefore, for specific tasks well-defined interfaces are put at the disposal of the user. These interfaces are basically FORTRAN subroutines containing a subroutine header, a description of the input and output variables and declaration statements for these variables. The body of the routine has to be written by the user.

Subsections

- creep.
- hardening.
- user-defined material laws.
  - Fiber reinforced materials.
  - The Cailletaud single crystal model.
  - Elastically anisotropic material with isotropic viscoplastic behavior.
- user-defined nonlinear equations
  - Mean rotation MPC.