*HEADING
: SIMPLE CONTACT TEST, 3D FINITE SLIDING, TRANSFORM, FRICTION
*ELEMENT,TYPE=C3D20,ELSET=ALL_ELEMENTS
1, 1,3,13,11,101,103,113,111,2,1003,12,1001,102,1103,112,
   1101,1011,1013,1113,1111
2, 3,5,15,13,103,105,115,113,4,1005,14,1003,104,1105,114,
   1103,1013,1015,1115,1113
3, 5,7,17,15,105,107,117,115,6,1007,16,1005,106,1107,116,
   1105,1015,1017,1117,1115
4, 21,23,33,31,121,123,133,131,22,1123,32,1121,122,1133,132,
   1131,1021,1023,1033,1031
*ELSET,ELSET=BASE
1,2,3
*ELSET,ELSET=SLIDER
4, 
*NODE,NSET=ALL_NODES
1,0.0,0.0
7,7.5,0.0
11,0.0,2.0
17,7.5,2.0
21,0.5,2.1
23,2.25,2.1
31,0.5,4.1
33,2.25,4.1
101,0.0,0.0,2.5
107,7.5,0.0,2.5
111,0.0,2.0,2.5
117,7.5,2.0,2.5
121,0.5,2.1,2.5
123,2.25,2.1,2.5
131,0.5,4.1,2.5
133,2.25,4.1,2.5
1001,0.0,1.0
1007,7.5,1.0
1011,0.0,0.0,1.25
1017,7.5,0.0,1.25
1101,0.0,1.0,2.5
1107,7.5,1.0,2.5
1111,0.0,2.0,1.25
1117,7.5,2.0,1.25
1021,0.5,2.1,1.25
1023,2.25,2.1,1.25
1121,0.5,3.1
1123,2.25,3.1
1031,0.5,4.1,1.25
1033,2.25,4.1,1.25
1131,0.5,3.1,2.5
1133,2.25,3.1,2.5
*NGEN,NSET=ALL_NODES
1,7
11,17
21,23
31,33
101,107
111,117
121,123
131,133
1001,1007,2
1011,1017,2
1101,1107,2
1111,1117,2
*NSET,NSET=BOTTOM,G
1,7
101,107
1011,1017,2
*NSET,NSET=TOP,G
31,33
131,133
1031,1033,2
*NMAP,NSET=ALL_NODES,TYPE=RECTANGULAR
0,0,0,.8,.0,.6
.48,.6,-.64
*TRANSFORM,NSET=ALL_NODES
.8,.0,.6,.48,.6,-.64
*SOLID SECTION, ELSET=ALL_ELEMENTS,MATERIAL=STEEL
*surface, NAME=SURFACE_SLIDE
SLIDER, S3
*surface, NAME=SURFACE_BASE
BASE, S5
*SURFACE INTERACTION, NAME=FRICTION_SURFACE
*SURFACE BEHAVIOR, AUGMENTED
*FRICTION
0.1, 
*CONTACT PAIR, INTERACTION=FRICTION_SURFACE, TYPE=SURFACE TO SURFACE
SURFACE_SLIDE, SURFACE_BASE
*MATERIAL,NAME=STEEL
*ELASTIC
 30.E6,0.3
*BOUNDARY
1,1
11,1
101,1
111,1
1001,1
1011,1
1101,1
1111,1
BOTTOM,2
ALL_NODES,3
*STEP,NLGEOM,INC=20,UNSYMM=YES
 FIRST COMPRESS
*STATIC,DIRECT
0.67,1.
*CONTROLS,PARAMETERS=FIELD
1.0E-6, 
*BOUNDARY
TOP,1
TOP,2,2,-.15
*EL PRINT
S, 
E, 
*NODE PRINT
U,
RF,
*EL FILE,FREQ=5
S, 
E, 
*NODE FILE,FREQ=5
U,RF
*PRINT,CONTACT=YES
*CONTACT PRINT
*CONTACT FILE
*OUTPUT,FIELD
*ELEMENT OUTPUT, VARIABLE=PRESELECT
*NODE OUTPUT, VARIABLE=PRESELECT
*END STEP
*STEP,INC=30,UNSYMM=YES
SLIDE TO THE RIGHT
*STATIC
.2,1.
*CHANGE FRICTION,INTERACTION=FRICTION_SURFACE
*FRICTION
0.2, 
*BOUNDARY
TOP,2,2,-.15
TOP,1,1,4.
*END STEP