*HEADING
: *CONTACT INTERFERENCE IN PRESCRIBED DIR. [R3D4]
*RESTART,WRITE
*NODE,NSET=BASE
1,
2,1.,
3,1.,1.2,
4,,1.2
99,,5.
*NODE,NSET=VERTEX
11,-1.,1.,-1.
12,2.,1.,-1.
13,2.,1.,2.
14,-1.,1.,2.
*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
*SOLID SECTION,ELSET=BOT,MATERIAL=MAT
*MATERIAL,NAME=MAT
*ELASTIC
1.E5,0.
*ELEMENT, TYPE=R3D4,ELSET=RIGIDS
21,11,12,13,14
*SURFACE INTERACTION,NAME=INTER
*RIGID BODY,ELSET=RIGIDS,REFNODE=99
*surface,NAME=BZSURF
RIGIDS,SPOS
*surface,NAME=IRSELS
BOT,S5
*CONTACT PAIR,INTERACTION=INTER
IRSELS,BZSURF
*BOUNDARY
99,1,6
*BOUNDARY
1,1,2
2,1,2
101,1,2
102,1,2
BASE,3,3
*STEP,INC=20,NLGEOM
*STATIC
0.2,1.,0.2,0.2
*CONTACT INTERFERENCE
IRSELS,BZSURF,0.2,0.,-1.,0.
*EL FILE
S, 
*NODE FILE
U, 
*CONTACT FILE,SLAVE=IRSELS,MASTER=BZSURF
*CONTACT PRINT,SLAVE=IRSELS,MASTER=BZSURF
*PRINT,CONTACT=YES
*ENDSTEP