*HEADING
	3-D ELEMENT IN CONTACT WITH ANOTHER 3-D DEFORMABLE ELEMENT.
	NORMALS ARE NOT MODIFIED. VERIFICATION FOR *CLEARANCE OPTION.
*NODE
1,
2,1.,
3,1.,1.05,
4,,1.05
5,,,1.0
6,1.,,1.0
7,1.,1.05,1.0
8,,1.05,1.0
11,-1.,1.0,-1.0
12,2.,1.,-1.0
13,2.,3.,-1.0
14,-1.,3.,-1.0
15,-1.,1.0,2.0
16,2.,1.0,2.0
17,2.,3.,2.0
18,-1.,3.,2.0
*NSET,NSET=CONTACT_NODES
3,4,7,8
*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
3.E7,0.
*surface,NAME=TOP-SURFACE
TOP,S3
*surface,type=node,NAME=SECONDARY-SURFACE
CONTACT_NODES,
*CLEARANCE,SECONDARY=SECONDARY-SURFACE,MAIN=TOP-SURFACE,TABULAR
3,0.0
4,0.0
7,0.0
8,0.0
*SURFACE INTERACTION,NAME=SLIDING_SURFACE
*CONTACT PAIR,INTERACTION=SLIDING_SURFACE, SMALL SLIDING
SECONDARY-SURFACE,TOP-SURFACE
*BOUNDARY
1,1,3
2,2,3
3,3,3
4,3,3
5,2,2
6,2,2
13,2,3
14,1,3
11,3,3
12,3,3
17,2,2
18,2,2
*STEP,INC=50,NLGEOM
*STATIC
0.1,1.0
*BOUNDARY
11,2,2,-0.2
12,2,2,-0.2
15,2,2,-0.2
16,2,2,-0.2
*PRINT,CONTACT=YES
*NODE FILE,FREQ=100
U,RF
*EL FILE,FREQ=100
S, 
E, 
*ENDSTEP