*HEADING
 : Adjust contact surface normal at symmetry plane
 Finite sliding example with CPE3 elements
 Local cylindrical coordinate system
*RESTART,WRITE
*SYSTEM
 0.0, 0.0, 0.0, -1., -1., 0.
*NODE, NSET=NALL
  1,  0.0,  1.5, 0.0
  5,  1.5,  0.0, 0.0
 11,  0.0,  2.0, 0.0
 15,  2.0,  0.0, 0.0 
 21,  0.0,  2.5, 0.0
 25,  2.5,  0.0, 0.0
 31,  0.0,  2.6, 0.0
 35,  2.6,  0.0, 0.0
 41,  0.0,  3.0, 0.0
 45,  3.0,  0.0, 0.0
 51,  0.0,  3.5, 0.0
 55,  3.5,  0.0, 0.0
 99,  0.0,  0.0, 0.0
*NGEN, LINE=C, NSET=NALL
   1,  5, 1, 99
  11, 15, 1, 99
  21, 25, 1, 99
  31, 35, 1, 99
  41, 45, 1, 99
  51, 55, 1, 99
*ELEMENT,TYPE=CPE3
  1,   1, 12, 11
  2,   1,  2, 12
  3,   2,  3, 12
  4,  12,  3, 13
  9,  11, 12, 21
 10,  21, 12, 22
 11,  12, 23, 22
 12,  12, 13, 23
 21,  31, 32, 42
 22,  31, 42, 41
 23,  32, 33, 42
 24,  42, 33, 43
 29,  41, 42, 51
 30,  51, 42, 52
 31,  42, 43, 53
 32,  42, 53, 52
*ELGEN,ELSET=EALL
  1, 2, 2, 4
  2, 2, 2, 4
  3, 2, 2, 4
  4, 2, 2, 4
  9, 2, 2, 4
 10, 2, 2, 4
 11, 2, 2, 4
 12, 2, 2, 4
 21, 2, 2, 4
 22, 2, 2, 4
 23, 2, 2, 4
 24, 2, 2, 4
 29, 2, 2, 4
 30, 2, 2, 4
 31, 2, 2, 4
 32, 2, 2, 4
*SOLID SECTION, ELSET=EALL, MAT=MAT1
*MATERIAL,NAME=MAT1
*ELASTIC
 3000.0,0.2
*ELSET,ELSET=EIN
 9,10,11,12,13,14,15,16
*ELSET,ELSET=EOUT,GENE
 21,28,1
*surface, NAME=MASTER, TRIM=YES
 EIN,
*surface, NAME=SLAVE
 EOUT,
*CONTACT PAIR,INTERACTION=NONE
 SLAVE,MASTER
*SURFACE INTERACTION,NAME=NONE
*TRANSFORM, NSET=NALL, TYPE=C
 0.0, 0.0, 0.0, 0.0, 0.0, 1.0
*BOUNDARY
  1, YSYMM
 11, YSYMM
 21, YSYMM
 31, YSYMM
 41, YSYMM
 51, YSYMM
  5, YSYMM
 15, YSYMM
 25, YSYMM
 35, YSYMM
 45, YSYMM
 55, YSYMM
** 
** STEP 1 : Apply pressure load
**
*STEP, NLGEOM, UNSYMM=yes
*STATIC
 0.25, 1.0
*DLOAD
 30, P3, 100.0
 32, P2, 100.0
 34, P3, 100.0
 36, P2, 100.0
*PRINT, CONTACT=YES
*NODE PRINT, F=0
*EL PRINT, F=0
*CONTACT PRINT, FREQ=100
*OUTPUT,DIAGNOSTICS=NO
*END STEP
**
** STEP 2 : Remove pressure load
**
*STEP, NLGEOM, INC=1
*STATIC
 ,1.0
*DLOAD, OP=NEW
 30, P3, 0.0
 32, P2, 0.0
 34, P3, 0.0
 36, P2, 0.0
*PRINT, CONTACT=YES
*NODE PRINT, F=0
*EL PRINT, F=0
*CONTACT PRINT, FREQ=100
*END STEP