*HEADING
 : FINITE SLIDING CONTACT C3D5
ZERO FRICTION
*NODE
1, 
7,7.5
*NGEN, NSET=E1
1,7
*NCOPY, OLDSET=E1, NEWSET=E2, SHIFT, CHANGE=20
0., 0., 2.5

*NFILL, NSET=BOT
E1,E2,2,10
*NCOPY, OLDSET=BOT, NEWSET=TOP, SHIFT, CHANGE=200
0.,2.,0.

*NFILL, NSET=BALL
BOT,TOP,2,100
*NODE
501, 0.5, 2.1, 0.25
503, 2.25, 2.1, 0.25
*NGEN, NSET=S1
501,503
*NCOPY, OLDSET=S1, NEWSET=S2, SHIFT, CHANGE=20
0., 0., 2.0

*NFILL, NSET=SLI_BOT
S1,S2,2,10
*NCOPY, OLDSET=SLI_BOT, NEWSET=SLI_TOP, SHIFT, CHANGE=200
0.,2.0,0.

*NFILL, NSET=SALL
SLI_BOT,SLI_TOP,2,100
*NSET, NSET=BC1
1,21,201,221
*NSET, NSET=NALL
BALL, SALL
*NSET,NSET=QA_TEST,GEN
1,200,1
*NMAP, NSET=NALL, TYPE=RECTANGULAR
0,0,0,.8,.0,.6
.48,.6,-.64
*TRANSFORM, NSET=NALL
.8,.0,.6,.48,.6,-.64
*ELEMENT, TYPE=C3D5
1, 1, 21, 23,  3,223
2, 1,201,221, 21,223
3, 1,  3,203,201,223
4, 3, 23, 25,  5,223
5, 3,  5,205,203,223
6, 5, 25,225,205,223
7, 5,205,225, 25,227
8, 5, 25, 27,  7,227
9, 5,  7,207,205,227
100, 501,521,523,503, 723
101, 501,701,721,521, 723
102, 501,503,703,701, 723
*ELSET,ELSET=BLOCK,GEN
1,9
*ELSET, ELSET=SLIDER
100,101,102
*ELSET, ELSET=EALL
SLIDER, BLOCK
*SOLID SECTION, ELSET=EALL, MATERIAL=MAT
*MATERIAL, NAME=MAT
*ELASTIC
30.0E6, 0.3
*ELSET, ELSET=BTOP3
2,7
*ELSET, ELSET=BTOP4
3,5,6,9
*ELSET, ELSET=SBOT
100
*surface, NAME=SL1
SBOT, S1
*surface, NAME=MA1
BTOP3, S3
BTOP4, S4
*CONTACT PAIR, INTERACTION=INT
SL1, MA1
*SURFACE INTERACTION, NAME=INT
*BOUNDARY
BC1,1
BOT,2,3
SLI_TOP,3
********************************************
*STEP, NLGEOM, INC=100, UNSYMM=YES
 STEP 1: FIRST COMPRESS
*STATIC, DIRECT
0.67,1.0
*CONTROLS, PARAMETER=FIELD
1.0E-6, 
*BOUNDARY
SLI_TOP,1
SLI_TOP,2,2,-.15
*EL PRINT, F=0
*NODE PRINT, F=0
*EL FILE,FREQ=5
S,E
*NODE FILE,FREQ=5,NSET=QA_TEST
U,RF
*CONTACT FILE, MASTER=MA1
CSTRESS,CDISP
CAREA, 
CFN,CFS
CMN,CMS
CFT,CMT
XN,XS,XT
*END STEP
********************************************
*STEP, NLGEOM, INC=100, UNSYMM=YES
 STEP2: SLIDE ACROSS TOP - ZERO FRICTION
*STATIC
0.1,1.0
*BOUNDARY
SLI_TOP,2,2,-.15
SLI_TOP,1,1,4.
*END STEP