# 8.14. 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.

    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

    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