*HEADING
 HERTZ CONTACT PROBLEM 3D:
 ELEM: C3D10M    INTERFACE: SMALL SLIDING
*RESTART,WRITE,OVERLAY
*NODE,NSET=NALL
*NODE,NSET=RIGNODE
*NSET,NSET=EQUATION,GEN
*EQUATION
EQUATION,2,1.,450,2,-1.
*ELEMENT, TYPE=C3D10M, ELSET=EALL
*ELSET,ELSET=BOT
**
** Contact definition
**
*ELEMENT,TYPE=R3D4,ELSET=ERIGID
*RIGID BODY,ELSET=ERIGID,REF NODE=10000
*surface,NAME=RIGID
ERIGID,SPOS
*surface,NAME=CYLBOT
BOT,S1
*CONTACT PAIR, INTERACTION=HERTZ,SMALL SLIDING
CYLBOT,RIGID
*SURFACE INTERACTION,NAME=HERTZ
*BOUNDARY
10000, 1,6
      21, 3,,
      22, 3,,
      23, 3,,
      24, 3,,
      25, 3,,
      26, 3,,
      27, 3,,
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 30.E6,0.3
*DENSITY
7.5E-4,
*INITIAL CONDITIONS,TYPE=VELOCITY
NALL,2,-352
*STEP,INC=100
*DYNAMIC,HAFTOL=1.E10
2.E-5,1.E-3,,2.E-5
*PRINT,CONTACT=YES
*EL PRINT,FREQUENCY=2
S11,E11
*NODE PRINT,FREQUENCY=10
U,
RF,
*NODE FILE,FREQUENCY=10
RF,
*CONTACT FILE,MASTER=RIGID,SLAVE=CYLBOT,FREQUENCY=5
*END STEP