1.1.9 FRIC

1.1.9 FRIC_COEF
User subroutine to define the frictional coefficient for contact surfaces.

Product: Abaqus/Standard

References

Overview

User subroutine FRIC_COEF:

can be used to define the isotropic frictional coefficient between contacting surfaces;
corresponds to the classical Coulomb friction model; and
can be used with the contact pair and general contact algorithms.

User subroutine interface

      subroutine fric_coef (
C Write only - 
     *   fCoef, fCoefDeriv, 
C Read only - 
     *   nBlock, nProps, nTemp, nFields, 
     *   jFlags, rData, 
     *   surfInt, surfSlv, surfMst, 
     *   props, slipRate, pressure, 
     *   tempAvg, fieldAvg )
C
      include 'aba_param.inc'
C
      dimension fCoef(nBlock), 
     *   fCoefDeriv(nBlock,3),
     *   props(nProps),
     *   slipRate(nBlock),
     *   pressure(nBlock),
     *   tempAvg(nBlock), 
     *   fieldAvg(nBlock,nFields)
C
      parameter( iKStep   = 1,
     *           iKInc    = 2,
     *           nFlags   = 2 )
C
      parameter( iTimStep = 1,
     *           iTimGlb  = 2,
     *           iDTimCur = 3,
     *           nData    = 3 )
C
      dimension jFlags(nFlags), rData(nData)
C
      character*80 surfInt, surfSlv, surfMst 
C
      user coding to define fCoef
      return
      end

Variables to be defined

fCoef(nBlock)

This array must be updated to the current values of the friction coefficient at the contact point.

fCoefDeriv(nBlock,3)

This array must be updated to the derivatives of the friction coefficient with respect to slip rate, pressure, and temperature at the contact point.

Variables passed in for information

nBlock

Equal to 1.

nProps

User-specified number of property values associated with this friction model.

nTemp

1 if the temperature is defined and 0 if the temperature is not defined.

nFields

Number of user-specified field variables.

jFlag(1)

Step number.

jFlag(2)

Increment number.

rData(1)

Value of step time.

rData(2)

Value of total time.

rData(3)

Current increment in time from to .

surfInt

User-specified surface interaction name, left justified.

surfSlv

Slave surface name, left justified.

surfMst

Master surface name, left justified.

props(nProps)

User-specified vector of property values to define the frictional coefficient at the contact point.

slipRate(nBlock)

This array contains the rate of tangential slip at the contact point for the current time increment.

pressure(nBlock)

This array contains the pressure at the contact point projected at the end of the current time increment.

tempAvg(nBlock)

Average current temperature between the master and slave surfaces at the contact point.

fieldAvg(nBlock,nFields)

Average current value of all the user-specified field variables between the master and slave surfaces at the contact point.

1.1.9 FRIC_COEF

1.1.9 FRIC_COEFUser subroutine to define the frictional coefficient for contact surfaces.