*HEADING
 : Adjust contact surface normal at symmetry plane
 Finite sliding example with CPE3 elements
 Local cylindrical coordinate system
*SYSTEM
*NODE, NSET=NALL
*NGEN, LINE=C, NSET=NALL
*ELEMENT,TYPE=CPE3
*ELGEN,ELSET=EALL
*SOLID SECTION, ELSET=EALL, MAT=MAT1
*MATERIAL,NAME=MAT1
*ELASTIC
 3000.0,0.2
*ELSET,ELSET=EIN
*ELSET,ELSET=EOUT,GENE
*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
*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, INC=50
*STATIC
 ,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
*END STEP
**
** STEP 2 : Remove pressure load
**
*STEP, NLGEOM, INC=50
*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