*HEADING
: *CONTACT INTERFERENCE SIMPLE ALLOW. INTERFER. [3D SMALL SLIDE]
*NODE,NSET=BASE
1,
2,1.,
3,1.,1.2,
4,,1.2
11,-1.,1.
12,2.,1.
13,2.,3.
14,-1.,3.
*NCOPY,OLDSET=BASE,NEWSET=COPY,SHIFT,CHANGE NUMBER=100
0.,0.,1.

*ELEMENT,TYPE=C3D8,ELSET=BOT
1,1,2,3,4,101,102,103,104
*ELEMENT,TYPE=C3D8,ELSET=TOP
11,11,12,13,14,111,112,113,114
*SOLID SECTION,ELSET=TOP,MATERIAL=MAT
*SOLID SECTION,ELSET=BOT,MATERIAL=MAT
*MATERIAL,NAME=MAT
*ELASTIC
1.E5,0.
*surface, NAME=TOPS
TOP,S3
*surface, NAME=BOTS
BOT,S5
*CONTACT PAIR, INTERACTION=INTERS, SMALL SLIDING
BOTS,TOPS
*SURFACE INTERACTION,NAME=INTERS
*BOUNDARY
1,1,2
2,1,2
13,1,2
14,1,2
101,1,2
102,1,2
113,1,2
114,1,2
BASE,3,3
COPY,3,3
*STEP,INC=20,NLGEOM
*STATIC
0.2,1.,0.2,0.2
*CONTACT INTERFERENCE
BOTS,TOPS,0.2
*EL FILE
S, 
*NODE FILE
U, 
*CONTACT FILE,SLAVE=BOTS,MASTER=TOPS
*CONTACT PRINT,SLAVE=BOTS,MASTER=TOPS
*PRINT,CONTACT=YES
*ENDSTEP