*HEADING
:CONTACT INTERFERENCE IN PRESCRIBED DIR; SURFACE BASED; FINITE SLIDING
*RESTART,WRITE,FREQ=999
*NODE,NSET=PIN
1,
2, 1,
3, 1,1,
4, 0,1
15, -1,-1,2
16, 2,-1,2                                     
17, 2,2,2
18, -1,2,2
*NODE,NSET=FREE
5, 0,0,1.2
6, 1,0,1.2
7, 1,1,1.2
8, 0,1,1.2
11, -1,-1,1
12, 2,-1,1
13, 2,2,1
14, -1,2,1
*ELEMENT,TYPE=C3D8,ELSET=BOT
1, 1,2,3,4,5,6,7,8
*ELEMENT,TYPE=C3D8,ELSET=TOP
11, 11,12,13,14,15,16,17,18
*SOLID SECTION,ELSET=TOP,MATERIAL=MAT
*SOLID SECTION,ELSET=BOT,MATERIAL=MAT
*MATERIAL,NAME=MAT
*ELASTIC                                                              
1.E5,0.
*BOUNDARY
PIN,1,3
*surface, NAME=TOPS
TOP,S1
*surface, NAME=BOTS
BOT,S2
*CONTACT PAIR, INTERACTION=INTERS
BOTS,TOPS
*SURFACE INTERACTION,NAME=INTERS
*STEP,INC=20,NLGEOM
*STATIC
0.2,1.,0.2,0.2
*CONTACT INTERFERENCE
BOTS,TOPS,0.2,0.,0.,-1.
*NODE FILE,NSET=FREE
U, 
*CONTACT FILE,SLAVE=BOTS,MASTER=TOPS
*CONTACT PRINT,SLAVE=BOTS,MASTER=TOPS
*PRINT,CONTACT=YES
*ENDSTEP