.. _contact-rigid:

***********************
Analytic Rigid Surfaces
***********************

.. warning::

   The commands for analytic rigid surface (ARS) contact (Goodyear specific) in this section are in development and have not been tested for a wide variety of applications. See the Goodyear Manual for a description of ARS contact.

.. code-block:: sierrainput

   BEGIN INTERACTION
     FRICTION DIRECTION = {LEGACY|OPPOSITE}
     NAME = <string>NAME
     RESET ACCUMULATED = {OFF|ON}
     SLIP PREDICTOR = <real>val
     SLIP TOLERANCE = <real>val
     SST FRICTION EVALUATION = {LEGACY|MEAN QUADRATURE}
     TYING TOLERANCE = <real>val
   END

.. code-block:: sierrainput

   BEGIN SST FRICTION MODEL
     FRICTION SCALING = <real>
     MUVSSLIP FUNCTION = <string>
     PRESSURE EXPONENT = <real>
     PRESSURE REFERENCE = <real>
     SCALING FUNCTION = <string>
     XMAX = <real>
     XSTD = <real>
     YMAX = <real>
     YSTD = <real>
   END

   BEGIN TIME DEPENDENT FRICTION MODEL
     MU = <real>
     TIME FUNCTION = <string>
   END
