*HEADING
: Adjust contact surface normal at symmetry plane
Small sliding example with CPE8 elements
Local cylidrical coordinate system
*SYSTEM
0.0, 0.0, 0.0, 2., 1., 0.
*NODE, NSET=NALL
1,  0.0,  1.5, 0.0
9,  1.5,  0.0, 0.0
11,  0.0,  1.75,0.0
19,  1.75, 0.0, 0.0
21,  0.0,  2.0, 0.0
29,  2.0,  0.0, 0.0
31,  0.0,  2.25,0.0
39,  2.25, 0.0, 0.0
41,  0.0,  2.5, 0.0
49,  2.5,  0.0, 0.0
101,  0.0,  2.6, 0.0
109,  2.6,  0.0, 0.0
111,  0.0,  2.8, 0.0
119,  2.8,  0.0, 0.0
121,  0.0,  3.0, 0.0
129,  3.0,  0.0, 0.0
131,  0.0,  3.25,0.0
139,  3.25, 0.0, 0.0
141,  0.0,  3.5, 0.0
149,  3.5,  0.0, 0.0
99,  0.0, 0.0, 0.0
*NGEN, LINE=C, NSET=NALL
1,  9, 1, 99
11, 19, 1, 99
21, 29, 1, 99
31, 39, 1, 99
41, 49, 1, 99
101,109, 1, 99
111,119, 1, 99
121,129, 1, 99
131,139, 1, 99
141,149, 1, 99
*ELEMENT,TYPE=CPE8
1,  1,  3, 23, 21,  2, 13, 22, 11
11,101,103,123,121,102,113,122,111
*ELGEN,ELSET=EALL
1, 4,2,1,2,20,4
11,4,2,1,2,20,4
*solid section,elset=EALL,mat=MAT1
*MATERIAL,NAME=MAT1
*ELASTIC
3000.0,0.2
*ELSET,ELSET=EIN
5,6,7,8
*ELSET,ELSET=EOUT
11,12,13,14
*surface, NAME=MASTER
EIN,
*surface, NAME=SLAVE
EOUT,
*CONTACT PAIR,INTERACTION=NONE,SMALL SLIDING, TYPE=SURFACE TO SURFACE
SLAVE,MASTER
*SURFACE INTERACTION,NAME=NONE
*SURFACE BEHAVIOR, AUGMENTED
*NSET, NSET=NXSYMM
1, 11, 21, 31, 41, 101, 111, 121, 131, 141
*NSET, NSET=NYSYMM
9, 19, 29, 39, 49, 109, 119, 129, 139, 149
*TRANSFORM, NSET=NALL, TYPE=C
0.,0.,0., 0., 0., 1.
**
** STEP 1 : Apply pressure load
**
*STEP, NLGEOM, INC=50
*STATIC
,1.0
*DLOAD
15, P3, 100.0
16, P3, 100.0
17, P3, 100.0
18, P3, 100.0
*BOUNDARY
NXSYMM, YSYMM
NYSYMM, YSYMM
*PRINT, CONTACT=YES
*NODE PRINT, F=0
*EL PRINT, F=0
*CONTACT PRINT, FREQ=100
*CONTACT FILE, MASTER=MASTER, SLAVE=SLAVE, FREQ=100
CSTRESS, CDISP,
*END STEP
**
** STEP 2 : Remove pressure load
**
*STEP, NLGEOM, INC=50
*STATIC
,1.0
*DLOAD, OP=NEW
15, P3, 0.0
16, P3, 0.0
17, P3, 0.0
18, P3, 0.0
*PRINT, CONTACT=YES
*NODE PRINT, F=0
*EL PRINT, F=0
*CONTACT PRINT, FREQ=100
*CONTACT FILE, MASTER=MASTER, SLAVE=SLAVE, FREQ=100
CSTRESS, CDISP,
*END STEP