*HEADING
: Adjust contact surface normal at symmetry plane
Small sliding example with C3D8 elements
Global coordinate system
*NODE, NSET=NROT
1,         1.5,          0.,
2,          2.,          0.,
3,         2.5,          0.,
4,     1.38582,    0.574025,
5,     1.84776,    0.765367,
6,      2.3097,    0.956709,
7,     1.06066,     1.06066,
8,     1.41421,     1.41421,
9,     1.76777,     1.76777,
10,    0.574025,     1.38582,
11,    0.765366,     1.84776,
12,    0.956708,      2.3097,
13, -6.55671E-8,         1.5,
14, -8.74228E-8,          2.,
15, -1.09278E-7,         2.5,
16,         1.5,          0.,          1.
17,          2.,          0.,          1.
18,         2.5,          0.,          1.
19,     1.38582,    0.574025,          1.
20,     1.84776,    0.765367,          1.
21,      2.3097,    0.956709,          1.
22,     1.06066,     1.06066,          1.
23,     1.41421,     1.41421,          1.
24,     1.76777,     1.76777,          1.
25,    0.574025,     1.38582,          1.
26,    0.765367,     1.84776,          1.
27,    0.956708,      2.3097,          1.
28, -6.55671E-8,         1.5,          1.
29, -8.74228E-8,          2.,          1.
30, -1.09278E-7,         2.5,          1.
31,         2.6,          0.,
32,        3.05,          0.,
33,         3.5,          0.,
34,     2.40209,    0.994976,
35,     2.81783,     1.16718,
36,     3.23358,     1.33939,
37,     1.83848,     1.83848,
38,     2.15668,     2.15668,
39,     2.47487,     2.47487,
40,    0.994978,     2.40209,
41,     1.16719,     2.81783,
42,     1.33939,     3.23358,
43,  -1.1365E-7,         2.6,
44,  -1.3332E-7,        3.05,
45,  -1.5299E-7,         3.5,
46,         2.6,          0.,          1.
47,        3.05,          0.,          1.
48,         3.5,          0.,          1.
49,     2.40209,    0.994977,          1.
50,     2.81783,     1.16718,          1.
51,     3.23358,     1.33939,          1.
52,     1.83848,     1.83848,          1.
53,     2.15668,     2.15668,          1.
54,     2.47487,     2.47487,          1.
55,    0.994977,     2.40209,          1.
56,     1.16718,     2.81783,          1.
57,     1.33939,     3.23358,          1.
58,  -1.1365E-7,         2.6,          1.
59,  -1.3332E-7,        3.05,          1.
60,  -1.5299E-7,         3.5,          1.
*ELEMENT, TYPE=C3D8, ELSET=EALL
1,       1,       2,       5,       4,      16,      17,
20,      19
2,       2,       3,       6,       5,      17,      18,
21,      20
3,       4,       5,       8,       7,      19,      20,
23,      22
4,       5,       6,       9,       8,      20,      21,
24,      23
5,       7,       8,      11,      10,      22,      23,
26,      25
6,       8,       9,      12,      11,      23,      24,
27,      26
7,      10,      11,      14,      13,      25,      26,
29,      28
8,      11,      12,      15,      14,      26,      27,
30,      29
9,      31,      32,      35,      34,      46,      47,
50,      49
10,      32,      33,      36,      35,      47,      48,
51,      50
11,      34,      35,      38,      37,      49,      50,
53,      52
12,      35,      36,      39,      38,      50,      51,
54,      53
13,      37,      38,      41,      40,      52,      53,
56,      55
14,      38,      39,      42,      41,      53,      54,
57,      56
15,      40,      41,      44,      43,      55,      56,
59,      58
16,      41,      42,      45,      44,      56,      57,
60,      59
*SOLID SECTION, ELSET=EALL, MATERIAL=MAT1
1.0,
*MATERIAL, NAME=MAT1
*ELASTIC
3000.0,0.2
*ELSET, ELSET=EIN
2,       4,       6,        8
*ELSET, ELSET=EOUT
9,      11,      13,       15
*NSET, NSET=NXSYMM
13,      14,      15,      28,      29,      30,      43,      44,
45,      58,      59,       60
*NSET, NSET=NYSYMM
1,       2,       3,      16,      17,      18,      31,      32,
33,      46,      47,       48
*ELSET, ELSET=EPRESS
10,      12,      14,       16
*surface, NAME=MASTER
EIN,
*surface, NAME=SLAVE
EOUT,
*CONTACT PAIR,INTERACTION=NONE,SMALL SLIDING, TYPE=SURFACE TO SURFACE
SLAVE,MASTER
*SURFACE INTERACTION, NAME=NONE
*BOUNDARY
NXSYMM, XSYMM
NYSYMM, YSYMM
NXSYMM, 3,3
NYSYMM, 3,3
**
** STEP 1: Apply pressure load
**
*STEP, NLGEOM, INC=50
*STATIC
,1.0
*DLOAD
EPRESS,P4,100.0
*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
*STEP, NLGEOM, INC=50
**
** STEP 2 : Remove pressure load
**
*STATIC
,1.0
*DLOAD, OP=NEW
EPRESS,P4,0.0
*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