*HEADING
 EXAMPLE: SLIDER MECHANISM WITH SLIP RATE DEPENDENT FRICTION
 3-D DEF-DEF MODEL, STATIC & DYNAMIC ANALYSIS, EXPONENTIAL DECAY MODEL
*RESTART,WRITE,FREQ=0
**
** NODE GENERATION FOR THE ROD
**
*NODE,NSET=NCYL
   1, 0.0000,  0.0, 0.7500
   7, 0.7500,  0.0, 0.0000
  11, 0.0000,  0.0, 0.8333
  17, 0.8333,  0.0, 0.0000
  21, 0.0000,  0.0, 0.9166
  27, 0.9166,  0.0, 0.0000
  31, 0.0000,  0.0, 1.0000
  37, 1.0000,  0.0, 0.0000
 901, 0.0000, 12.0, 0.7500
 907, 0.7500, 12.0, 0.0000
 911, 0.0000, 12.0, 0.8333
 917, 0.8333, 12.0, 0.0000
 921, 0.0000, 12.0, 0.9166
 927, 0.9166, 12.0, 0.0000
 931, 0.0000, 12.0, 1.0000
 937, 1.0000, 12.0, 0.0000
*NGEN, LINE=C, NSET=NCYLBOT
   1,  7, 1, ,0.0, 0.0, 0.0
  11, 17, 1, ,0.0, 0.0, 0.0
  21, 27, 1, ,0.0, 0.0, 0.0
  31, 37, 1, ,0.0, 0.0, 0.0
*NGEN, LINE=C, NSET=NCYLTOP
 901, 907, 1, ,0.0, 12.0, 0.0
 911, 917, 1, ,0.0, 12.0, 0.0
 921, 927, 1, ,0.0, 12.0, 0.0
 931, 937, 1, ,0.0, 12.0, 0.0
*NFILL,NSET=NCYL
 NCYLBOT, NCYLTOP, 9, 100
*NSET, NSET=NSYMM, GEN
   1, 901, 100
  11, 911, 100
  21, 921, 100
   7, 907, 100
  17, 917, 100
  27, 927, 100
*NSET, NSET=NCYLZ, GEN
 31, 931, 100
*NSET, NSET=NCYLX, GEN
 37, 937, 100
*ELEMENT,TYPE=C3D8, ELSET=ROD
 1, 1, 11, 12, 2, 101, 111, 112, 102
*ELGEN, ELSET=ROD
 1, 6, 1, 1, 3, 10, 7, 9, 100, 21
*ELSET, ELSET=SURFA, GEN
  15,  20, 1
  36,  41, 1
  57,  62, 1
  78,  83, 1
  99, 104, 1
 120, 125, 1
 141, 146, 1
 162, 167, 1
 183, 188, 1
**
** NODE GENERATION FOR THE SLIDER
**
*NODE,NSET=NSLIDER
 1001, 0.0000, 9.0, 1.0625
 1007, 1.0625, 9.0, 0.0000
 1011, 0.0000, 9.0, 1.1875
 1017, 1.1875, 9.0, 0.0000
 1021, 0.0000, 9.0, 1.3125
 1027, 1.3125, 9.0, 0.0000
 1031, 0.0000, 9.0, 1.4375
 1037, 1.4375, 9.0, 0.0000
 1041, 0.0000, 9.0, 1.5625
 1047, 1.5625, 9.0, 0.0000
 1501, 0.0000,11.0, 1.0625
 1507, 1.0625,11.0, 0.0000
 1511, 0.0000,11.0, 1.1875
 1517, 1.1875,11.0, 0.0000
 1521, 0.0000,11.0, 1.3125
 1527, 1.3125,11.0, 0.0000
 1531, 0.0000,11.0, 1.4375
 1537, 1.4375,11.0, 0.0000
 1541, 0.0000,11.0, 1.5625
 1547, 1.5625,11.0, 0.0000
*NGEN, LINE=C, NSET=NSLIDERBOT
 1001, 1007, 1, , 0.0, 9.0, 0.0
 1011, 1017, 1, , 0.0, 9.0, 0.0
 1021, 1027, 1, , 0.0, 9.0, 0.0
 1031, 1037, 1, , 0.0, 9.0, 0.0
 1041, 1047, 1, , 0.0, 9.0, 0.0
*NGEN, LINE=C, NSET=NSLIDERTOP
 1501, 1507, 1, , 0.0,11.0, 0.0
 1511, 1517, 1, , 0.0,11.0, 0.0
 1521, 1527, 1, , 0.0,11.0, 0.0
 1531, 1537, 1, , 0.0,11.0, 0.0
 1541, 1547, 1, , 0.0,11.0, 0.0
*NFILL, NSET=NSLIDER
 NSLIDERBOT, NSLIDERTOP, 5, 100
*NSET,NSET=NSLIDERTOPSURFACE, GEN
 1041, 1047, 1,
 1141, 1147, 1,
 1241, 1247, 1,
 1341, 1347, 1,
 1441, 1447, 1,
 1541, 1547, 1
*NSET, NSET=NSYMM, GEN
 1011, 1511, 100
 1021, 1521, 100
 1031, 1531, 100
 1041, 1541, 100
 1017, 1517, 100
 1027, 1527, 100
 1037, 1537, 100
 1047, 1547, 100
*NSET, NSET=NSLZ, GEN
 1001, 1501, 100
*NSET, NSET=NSLX, GEN
 1007, 1507, 100
*ELEMENT,TYPE=C3D8, ELSET=SLIDER
 300, 1001, 1011, 1012, 1002, 1101, 1111, 1112, 1102
*ELGEN, ELSET=SLIDER
 300, 6, 1, 1, 4, 10, 6, 5, 100, 30
*ELSET, ELSET=SURFB, GEN
 300, 305, 1
 330, 335, 1
 360, 365, 1
 390, 395, 1
 420, 425, 1
**
** NODE GENERATION FOR COMPOUND
** 
*NODE,NSET=NCOMPOUND
 3001, 0.0000, 9.1, 1.0000
 3007, 1.0000, 9.1, 0.0000
 3011, 0.0000, 9.1, 1.0221
 3017, 1.0221, 9.1, 0.0000
 3021, 0.0000, 9.1, 1.0443
 3027, 1.0443, 9.1, 0.0000
 3031, 0.0000, 9.1, 1.0665
 3037, 1.0665, 9.1, 0.0000
 3901, 0.0000,10.9, 1.0000
 3907, 1.0000,10.9, 0.0000
 3911, 0.0000,10.9, 1.0221
 3917, 1.0221,10.9, 0.0000
 3921, 0.0000,10.9, 1.0443
 3927, 1.0443,10.9, 0.0000
 3931, 0.0000,10.9, 1.0665
 3937, 1.0665,10.9, 0.0000
*NGEN, LINE=C, NSET=NCOMPBOT
 3001, 3007, 1, , 0.0, 9.1, 0.0
 3011, 3017, 1, , 0.0, 9.1, 0.0
 3021, 3027, 1, , 0.0, 9.1, 0.0
 3031, 3037, 1, , 0.0, 9.1, 0.0
*NGEN, LINE=C, NSET=NCOMPTOP
 3901, 3907, 1, , 0.0,10.9, 0.0
 3911, 3917, 1, , 0.0,10.9, 0.0
 3921, 3927, 1, , 0.0,10.9, 0.0
 3931, 3937, 1, , 0.0,10.9, 0.0
*NSET,NSET=NCOMPMIDSURFACE, GEN
 3011, 3017, 1
 3021, 3027, 1
 3911, 3917, 1
 3921, 3927, 1
*NFILL, NSET=NCOMPOUND
 NCOMPBOT, NCOMPTOP, 9, 100
*NSET, NSET=NSYMM, GEN
 3011, 3911, 100
 3021, 3921, 100
 3017, 3917, 100
 3027, 3927, 100
*NSET, NSET=NCZI, GEN
 3001, 3901, 100
*NSET, NSET=NCZO, GEN
 3031, 3931, 100
*NSET, NSET=NCXI, GEN
 3007, 3907, 100
*NSET, NSET=NCXO, GEN
 3037, 3937, 100
*ELEMENT,TYPE=C3D8, ELSET=COMPOUND
 500, 3001, 3011, 3012, 3002, 3101, 3111, 3112, 3102
*ELGEN, ELSET=COMPOUND
 500, 6, 1, 1, 3, 10, 6, 9, 100, 18
*ELSET, ELSET=SURFC, GEN
 500, 505, 1
 518, 523, 1
 536, 541, 1
 554, 559, 1
 572, 577, 1
 590, 595, 1
 608, 613, 1
 626, 631, 1
 644, 649, 1
*ELSET, ELSET=SURFD, GEN
 512, 517, 1
 530, 535, 1
 548, 553, 1
 566, 571, 1
 584, 589, 1
 602, 607, 1
 620, 625, 1
 638, 643, 1
 656, 661, 1
*surface, NAME=ROD
 SURFA,S4
*NORMAL, TYPE=CONTACT SURFACE
 ROD, NCYLZ, 0.0, 0.0, 1.0
 ROD, NCYLX, 1.0, 0.0, 0.0
*surface, NAME=SLIDER
 SURFB,S6
*NORMAL, TYPE=CONTACT SURFACE
 SLIDER, NSLZ, 0.0, 0.0, -1.0
 SLIDER, NSLX, -1.0, 0.0, 0.0
*surface, NAME=COMPIN
 SURFC,
*NORMAL, TYPE=CONTACT SURFACE
 COMPIN, NCZI, 0.0, 0.0, -1.0
 COMPIN, NCXI, -1.0, 0.0, 0.0
*surface, NAME=COMPOUT
 SURFD,
*NORMAL, TYPE=CONTACT SURFACE
 COMPOUT, NCZO, 0.0, 0.0, 1.0
 COMPOUT, NCXO, 1.0, 0.0, 0.0
*CONTACT PAIR, INTERACTION=I1,TYPE=SURFACE
 COMPIN, ROD
*CONTACT PAIR, INTERACTION=I2,SMALL SLIDING,TYPE=SURFACE
 COMPOUT, SLIDER
**
** SURFACE INTERACTION DEFINITION
**
*SURFACE INTERACTION,NAME=I1
*SURFACE INTERACTION,NAME=I2
*SURFACE BEHAVIOR, NO SEPARATION
**
** SOLID SECTION AND MATERIAL PROPERTY DEFINITIONS
**
*ELSET, ELSET=STEEL
 ROD, SLIDER,
*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
**
** NODAL TRANSFORMS AND BC'S
**
*NSET, NSET=NALL
 NCYL, NSLIDER, NCOMPOUND,
*TRANSFORM, NSET=NALL, TYPE=C
 0.,0.,0.,0.,1.,0.
**
** CONTACT INTERFERENCE STEP
**
*STEP, NLGEOM, UNSYMM=YES
 CONTACT INTERFERENCE
*STATIC
 0.25,1.0
*CONTACT INTERFERENCE, TYPE=CONTACT PAIR
 COMPOUT, SLIDER, 0.004
*BOUNDARY
 NSYMM,             2, 2, 0.0
 NCYLTOP,           1, 3, 0.0
 NCYLBOT,           1, 3, 0.0
 NCOMPMIDSURFACE,   1, 3, 0.0
 NSLIDERTOPSURFACE, 1, 3, 0.0
*PRINT,CONTACT=YES
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
** *NODE FILE, FREQ=0
*CONTACT PRINT,SECONDARY=COMPIN
*CONTACT PRINT,SECONDARY=COMPOUT
** *CONTACT FILE,SECONDARY=COMPIN,F=0
*OUTPUT,FIELD,FREQ=10
*contact output
 CSTATUS
*OUTPUT, HISTORY
*CONTACT OUTPUT, MAIN=ROD, SECONDARY=COMPIN
 CFN,
 CFS,
*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, SLIP TOLERANCE=0.01
 0.25,  0.0
 0.10,  2.5
*CHANGE FRICTION, INTERACTION=I2
*FRICTION, LAGRANGE
 100.0,
*BOUNDARY, OP=NEW
 NSYMM,             2, 2, 0.0
 NCYLTOP,           1, 3, 0.0
 NCYLBOT,           1, 3, 0.0
 NSLIDERTOPSURFACE, 1, 3, 0.0
*PRINT,CONTACT=YES
*OUTPUT,FIELD,FREQ=10
*contact output
 CSTATUS
*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
 NSLIDERTOPSURFACE, 3, 3, 1.0
*NODE PRINT, NSET=NSLIDERTOPSURFACE, FREQ=0
** *NODE FILE,  NSET=NSLIDERTOPSURFACE, FREQ=0
**  U,
**  RF,
*CONTACT PRINT, FREQ=0, MAIN=ROD, SECONDARY=COMPIN
 CFN,
 CFS,
** *CONTACT FILE,  FREQ=0, MAIN=ROD, SECONDARY=COMPIN
**  CFN,
**  CFS,
*OUTPUT, FIELD, FREQ=0
*NODE OUTPUT
 U,
*OUTPUT, HISTORY
*CONTACT OUTPUT, MAIN=ROD, SECONDARY=COMPIN
 CFN,
 CFS,
*END STEP
**
** STATIC SLIDING STEP
**
*STEP, NLGEOM, INC=200, UNSYMM=YES
 STATIC SLIDING STEP
*STATIC
 0.1,10.0,,0.2
*BOUNDARY, OP=MOD, AMPLITUDE=AMPDISP
 NSLIDERTOPSURFACE, 3, 3, 1.0
*NODE PRINT, NSET=NSLIDERTOPSURFACE, FREQ=0
** *NODE FILE,  NSET=NSLIDERTOPSURFACE, FREQ=0
**  U,
**  RF,
*CONTACT PRINT, FREQ=0, MAIN=ROD, SECONDARY=COMPIN
 CFN,
 CFS,
** *CONTACT FILE,  FREQ=0, MAIN=ROD, SECONDARY=COMPIN
**  CFN,
**  CFS,
*OUTPUT, FIELD, FREQ=0
*NODE OUTPUT
 U,
*OUTPUT, HISTORY
*CONTACT OUTPUT, MAIN=ROD, SECONDARY=COMPIN
 CFN,
 CFS,
*END STEP