*HEADING
 FILE NAME: 
 FEATURES TESTED: TWO DIMENSIONAL INTERFACE
                  USER SUBROUTINE GAPCON 
                  CLEARANCE DEPENDENT 
*NODE, NSET=NALL
 1, 
 2, 1.0, 
 3, 1.0,  1.,
 4, 0.0,  1.,
 5, 1.01, 
 6, 2.01, 
 7, 2.01, 1.,
 8, 1.01, 1., 
*NODE, NSET=XTRA
 998,
*NSET,NSET=PLANEA
 1,4
*NSET,NSET=PLANEB
 2,3
*NSET,NSET=PLANEC
 5,8
*NSET,NSET=PLANED
 6,7
*NSET,NSET=BCPLANE
 PLANEB,PLANEC
*NSET,NSET=CDPLANE
 PLANEC,PLANED
*ELEMENT,TYPE=CPEG4T,ELSET=ONE
 1, 1,2,3,4
*ELEMENT,TYPE=CPEG4T,ELSET=TWO
 2, 5,6,7,8,
*ELSET,ELSET=EALL
 ONE,TWO
*SOLID SECTION,ELSET=EALL,MATERIAL=BLOCK,REFNODE=XTRA
*MATERIAL,NAME=BLOCK
*ELASTIC,TYPE=ISO
 1.E5, 
*EXPANSION,TYPE=ISO,ZERO=0.0
 1.E-5, 
*CONDUCTIVITY,TYPE=ISO
 1., 
*SURFACE,NAME=ASURF
 ONE,S2
*SURFACE,NAME=BSURF
 TWO,S4
*CONTACT PAIR,INTERACTION=GAPC,SMALL SLIDING
 ASURF,BSURF
*SURFACE INTERACTION,NAME=GAPC
** clearance dependent gap conductance present
*GAP CONDUCTANCE,USER
*BOUNDARY
 NALL,2,2
 PLANEA,1
 PLANEC,1
*STEP
*COUPLED TEMPERATURE-DISPLACEMENT,STEADY STATE
 1., 1.
*BOUNDARY
 PLANEA,11,11,400.
 CDPLANE,11,11,200.
*NODE FILE,NSET=PLANEB
 U, 
 NT, 
*OUTPUT,FIELD
*NODE OUTPUT,NSET=PLANEB
 U,
 NT,
*EL FILE,ELSET=ONE
 S, 
 TEMP,
*OUTPUT,FIELD
*ELEMENT OUTPUT,ELSET=ONE
 S,
 TEMP,
*EL PRINT
 S,
 E,
 TEMP, 
*NODE PRINT
 U,
 RF,
 NT11,
*PRINT,CONTACT=YES
*CONTACT PRINT,SUM=YES,TOT=NO,FREQ=1,SLA=ASURF,MAST=BSURF,NSET=BCPLANE
*CONTACT FILE,SLAVE=ASURF,MASTER=BSURF,NSET=BCPLANE,FREQ=1
*OUTPUT,FIELD,FREQ=1
*CONTACT OUTPUT,VARIABLE=PRESELECT,SLAVE=ASURF,MASTER=BSURF,NSET=BCPLANE
*END STEP