*HEADING
 EXAMPLE: SLIDER MECHANISM WITH SLIP RATE DEPENDENT FRICTION
 AXISYMMETRIC MODEL, STATIC & DYNAMIC ANALYSIS, EXPONENTIAL DECAY MODEL
*RESTART,WRITE,FREQ=0
**
** NODE GENERATION FOR THE ROD
**
*NODE,NSET=NROD
   1, 0.7500,  0.0
  13, 0.7500, 12.0
 101, 0.8333,  0.0
 113, 0.8333, 12.0
 201, 0.9166,  0.0
 213, 0.9166, 12.0
 301, 1.0000,  0.0
 313, 1.0000, 12.0
*NGEN,NSET=NIN
 1,13,1
*NGEN,NSET=NOUT
 301,313,1
*NFILL, NSET=NROD
 NIN,NOUT,3,100
*NSET, NSET=NBOT
 1, 101, 201, 301
*NSET, NSET=NTOP
 13, 113, 213, 313
**
** NODE GENERATION FOR THE SLIDER
**
*NODE, NSET=NSLIDER
 501, 1.0625, 9.0
 505, 1.0625,11.0
 601, 1.1875, 9.0
 605, 1.1875,11.0
 701, 1.3125, 9.0
 705, 1.3125,11.0
 801, 1.4375, 9.0
 805, 1.4375,11.0
 901, 1.5625, 9.0
 905, 1.5625,11.0
*NGEN,NSET=NSLIN
 501,505,1
*NGEN,NSET=NSLOUT
 901,905,1
*NSET, NSET=NMOVE
 NSLOUT,
*NFILL, NSET=NSLIDER
 NSLIN,NSLOUT,4,100
**
** NODE GENERATION FOR THE COMPOUND MATERIAL
** 
*NODE, NSET=NCOMPOUND
 1001, 1.0000, 9.1
 1013, 1.0000,10.9
 1101, 1.0221, 9.1
 1113, 1.0221,10.9
 1201, 1.0443, 9.1
 1213, 1.0443,10.9
 1301, 1.0664, 9.1
 1313, 1.0664,10.9
*NGEN,NSET=NCIN
 1001, 1013, 1
*NGEN,NSET=NCOUT
 1301, 1313, 1
*NFILL,NSET=NCOMPOUND
 NCIN, NCOUT, 3, 100
*NSET,NSET=NHOLD
 1101,1201,1121,1221
*NSET,NSET=NALL
 NROD, 
 NSLIDER, 
 NCOMPOUND,
**
** ELEMENT DEFINIONS
**
*ELEMENT,TYPE=CAX4
   1, 1, 101, 102, 2
 200, 501, 601, 602, 502
 500, 1001, 1101, 1102, 1002
*ELGEN,ELSET=ROD
   1, 12, 1, 1, 3, 100, 40
*ELGEN,ELSET=RING
 200, 4 , 1, 1, 4, 100, 10
*ELGEN, ELSET=COMPOUND
 500, 12, 1, 1, 3, 100, 20
*ELSET, ELSET=STEEL
 ROD, RING,
**
** CONTACT surfaceS
**
*ELSET, ELSET=E1, GEN
 81, 92, 1
*ELSET, ELSET=E2, GEN
 200, 203, 1
*ELSET, ELSET=E3, GEN
 500, 511, 1
*ELSET, ELSET=E4, GEN
 540, 551, 1
*surface,NAME=ROD
 E1,S2
*surface,NAME=SLIDER
 E2,S4
*surface, NAME=COMP1
 E3,S4
*surface, NAME=COMP2
 E4,S2
*CONTACT PAIR, INTERACTION=I1
 COMP1, ROD
*CONTACT PAIR, INTERACTION=I2, SMALL SLIDING
 COMP2, SLIDER
**
** SURFACE INTERACTION DEFINITION
**
*SURFACE INTERACTION,NAME=I1
*SURFACE INTERACTION,NAME=I2
*SURFACE BEHAVIOR, NO SEPARATION
**
** SOLID SECTION AND MATERIAL PROPERTY DEFINITIONS
**
*SOLID SECTION,ELSET=STEEL,MATERIAL=STEEL
*MATERIAL,NAME=STEEL
*ELASTIC
 30.E6,0.3
*DENSITY
 0.73e-3,
*SOLID SECTION,ELSET=COMPOUND,MATERIAL=COMPOUND
*MATERIAL,NAME=COMPOUND
*ELASTIC
 1.E6,0.2
*DENSITY
 0.1e-3,
**
** AMPLITUDE DEFINITIONS
**
*AMPLITUDE, NAME=AMPDISP, DEFINITION=PERIODIC
 1, 0.6283, 0.0, -4.0
 4.0, 0.0
**
** CONTACT INTERFERENCE STEP
**
*STEP,NLGEOM
 CONTACT INTERFERENCE
*STATIC
 0.25,1.0
*CONTACT INTERFERENCE, TYPE=CONTACT PAIR
 COMP2, SLIDER, 0.004
*BOUNDARY
 NTOP,   1, 2, 0.0
 NBOT,   1, 2, 0.0
 NSLOUT, 1, 2, 0.0
 NHOLD,  2, 2, 0.0
*PRINT,CONTACT=YES
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
*CONTACT PRINT,SLAVE=COMP1
*CONTACT PRINT,SLAVE=COMP2
*CONTACT FILE,SLAVE=COMP1,F=0
*END STEP
**
** CHANGE FRICTION MODEL AND REMOVE CONTACT INTERFERENCE
**
*STEP, NLGEOM, UNSYMM=YES
 ADD FRICTION TO MODEL
*STATIC
 0.25,1.0
*CONTACT INTERFERENCE, OP=NEW
*CHANGE FRICTION, INTERACTION=I1
*FRICTION, EXPONENTIAL DECAY, TEST DATA
 0.25,  0.0
 0.10,  2.5
*CHANGE FRICTION, INTERACTION=I2
*FRICTION, LAGRANGE
 100.0,
*BOUNDARY, OP=NEW
 NTOP,   1, 2, 0.0
 NBOT,   1, 2, 0.0
 NMOVE,  1, 2, 0.0
*PRINT,CONTACT=YES
*END STEP
**
** DYNAMIC SLIDING STEP
**
*STEP, NLGEOM, INC=200, UNSYMM=YES
 DYNAMIC SLIDING STEP
*DYNAMIC, HAFTOL=5.0e6, INITIAL=NO
 0.05,10.0,1.0e-2,0.2
*BOUNDARY, OP=MOD, AMPLITUDE=AMPDISP
 NMOVE, 2, 2, 1.0
*MONITOR,NODE=903, DOF=2
*NODE PRINT, NSET=NMOVE, FREQ=0
*NODE FILE,  NSET=NMOVE, FREQ=0
 RF,
*CONTACT PRINT, FREQ=0, MASTER=ROD, SLAVE=COMP1
 CFN,
 CFS,
*CONTACT FILE,  FREQ=1, MASTER=ROD, SLAVE=COMP1
 CFN,
 CFS,
*OUTPUT, FIELD, FREQ=1
*NODE OUTPUT
 U,
*OUTPUT, HISTORY
*CONTACT OUTPUT, MASTER=ROD, SLAVE=COMP1
 CFN,
 CFS,
*END STEP
**
** STATIC SLIDING STEP
**
*STEP, NLGEOM, UNSYMM=YES, INC=1000
 STATIC SLIDE STEP
*STATIC
 0.1,10.0,,0.2
*BOUNDARY, OP=MOD, AMPLITUDE=AMPDISP
 NMOVE, 2, 2, 1.0
*MONITOR,NODE=903, DOF=2
*NODE PRINT, NSET=NMOVE, FREQ=0
*NODE FILE,  NSET=NMOVE, FREQ=0
 RF,
*CONTACT PRINT, FREQ=0, MASTER=ROD, SLAVE=COMP1
 CFN,
 CFS,
*CONTACT FILE,  FREQ=1, MASTER=ROD, SLAVE=COMP1
 CFN,
 CFS,
*OUTPUT, FIELD, FREQ=1
*NODE OUTPUT
 U,
*OUTPUT, HISTORY
*CONTACT OUTPUT, MASTER=ROD, SLAVE=COMP1
 CFN,
 CFS,
*END STEP