Abaqus User Subroutines Reference Guide  

1.2.7 VFRIC_COEF
User subroutine to define the frictional coefficient for contact surfaces.

Product: Abaqus/Explicit  

References

Overview

User subroutine VFRIC_COEF:

User subroutine interface

      subroutine vfric_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 'vaba_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
C
      return
      end

Variables to be defined

fCoef(nBlock)

This array must be updated to the current values of the friction coefficient for all contacting points.

fCoefDeriv(nBlock,3)

This array is not applicable to Abaqus/Explicit analyses.

Variables passed in for information

nBlock

Number of contacting points to be processed in this call to VFRIC_COEF.

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, not applicable to general contact.

surfMst

Master surface name, not applicable to general contact.

props(nProps)

User-specified vector of property values to define the frictional coefficient at contacting points.

slipRate(nBlock)

This array contains the rate of tangential slip at the contacting points for the current time increment.

pressure(nBlock)

This array contains the pressure at the contacting points applied at the end of the current time increment.

tempAvg(nBlock)

Average current temperature between the master and slave surfaces at the contacting points.

fieldAvg(nBlock,nFields)

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