*HEADING
: SIMPLE CONTACT TEST, FINITE SLIDING CONTACT WITH FRICTION, DEFORMABLE
*RESTART,WRITE
*AMPLITUDE,NAME=CONST
0,1,1,1
*AMPLITUDE,NAME=ZERO
0,0,1,0
*NODE
*NGEN,NSET=INNER
*NGEN,NSET=OUTER
*NGEN
*ELEMENT,TYPE=CAX8,ELSET=STEEL
*ELGEN,ELSET=STEEL
*ELSET,ELSET=ETOP
*ELSET,ELSET=EBOT
*surface,NAME=ASURF
ETOP,S1
*surface,NAME=BSURF
EBOT,S2
*CONTACT PAIR,INTERACTION=ROUGH,SMOOTH=0.1
ASURF,BSURF
*SURFACE INTERACTION,NAME=ROUGH
*SURFACE BEHAVIOR, AUGMENTED
*FRICTION
0.2,2.E+06
*SOLID SECTION,ELSET=STEEL,MATERIAL=STEEL
*MATERIAL,NAME=STEEL
*ELASTIC
 30.E6,0.3
*DENSITY
 10.0,
**********
*STEP,NLGEOM,UNSYMM=YES
  CONTACT
*STATIC
 0.7, 1.0
*CONTACT CONTROLS,FRICTION ONSET=DELAYED
*CONTROLS,PARAMETERS=FIELD
1.0E-6,
*BOUNDARY
 1,2
 11,2
 1001,2
 INNER,1
 OUTER,1,1,-.15
 OUTER,2
*PRINT,CONTACT=YES
*CONTACT PRINT,SLAVE=ASURF
*EL PRINT
S,E
*NODE PRINT
U,RF
*END STEP
*STEP,NLGEOM,UNSYMM=YES
  MOVE OUTER ACROSS
*STATIC
 1.,10.,1.
*BOUNDARY,OP=NEW
 INNER,1
1,2
11,2
1001,2
OUTER,1,1,-.15
OUTER,2,2,-4.
*END STEP
**
** step 3: Steady state dynamics, direct analysis
**
*STEP
*STEADY STATE DYNAMICS,DIRECT
20,100,5
*BOUNDARY,OP=NEW
 INNER,1
 1,2
 7,2
 11,2
 17,2
 OUTER,1,1
 OUTER,2,2,0.01
*END STEP
**
** step 4: frequency extraction
**
*STEP
*FREQUENCY,EIGENSOLVER=LANCZOS
29,
*BOUNDARY,OP=NEW
 INNER,1
 OUTER,1,1
 OUTER,2,2
*BOUNDARY,BASE NAME=ZERO
 1,2
 7,2
 11,2
 17,2
*NODE PRINT,F=0
*EL PRINT,F=0
*END STEP
**
** step 5: Steady state dynamics, subspace projection
**
*STEP
*STEADY STATE DYNAMICS,SUBSPACE PROJECTION,INTERVAL=RANGE
20,100,5
*BASE MOTION,BASE NAME=ZERO,AMPLITUDE=ZERO,DOF=2,TYPE=DISPLACEMENT
*BASE MOTION,AMPLITUDE=CONST,DOF=2,TYPE=DISPLACEMENT,SCALE=0.01
*END STEP