*HEADING
 STATIC INDENTATION OF A ELASTOMERIC FOAM WITH A HEMISPHERICAL PUNCH
********************************************************
** Measure the punch reaction force during the following 2 steps:
**     Step 1: Displace punch 250 mm downwards.
**     Step 2: Return punch to original position.
**             (Units: N, mm, sec)
********************************************************
*PREPRINT,MODEL=YES,HISTORY=NO
*RESTART,WRITE
*NODE
900000001,   0., 300.
900000019,   0.,   0.
900000481, 300., 300.
900000499, 300.,   0.
900000601, 600., 300.
900000619, 600.,   0.
*NSET,NSET=N1
900000001, 
*NSET,NSET=N19
900000019, 
*NSET,NSET=N481
900000481, 
*NSET,NSET=N499
900000499, 
*NFILL,NSET=TOP,BIAS=.85
 N1,N481,12,40
*NGEN,NSET=TOP
900000481,900000601,40
*NFILL,NSET=BOT,BIAS=.85
 N19,N499,12,40
*NGEN,NSET=BOT
900000499,900000619,40
*NFILL,NSET=ALLN,BIAS=.9
 TOP,BOT,9,2
*NSET,NSET=CENTER,GENERATE
900000001,900000019
*ELEMENT,TYPE=CAX4
900000001,900000003,900000043,900000041,900000001
*ELGEN,ELSET=FOAM
900000001,15,40,10,9,2,1
*ELSET,ELSET=CENT,GENERATE
900000001,900000141,10
900000061,900000069
*ELSET,ELSET=ETOP,GENERATE
900000001,900000101,10
*ELSET,ELSET=UPPER,GEN
900000001,900000141,10
*NODE,NSET=PUNCH
900001000,0.,510.
*SOLID SECTION,ELSET=FOAM,MATERIAL=FOAM,ORIENTATION=RECT,CONTROL=HGC
*SECTION CONTROLS,NAME=HGC,HOURGLASS=STIFFNESS
*ORIENTATION,NAME=RECT,SYSTEM=RECTANGULAR
 1.,0.,0., 0.,1.,0.
 3,0.
****************************************************
*MATERIAL,NAME=FOAM
*HYPERFOAM,N=2,TEST DATA INPUT,POISSON=0.0,MODULI=INSTANTANEOUS
*UNIAXIAL TEST DATA
 -.0217,   -.05
 -.0317,   -.10
 -.0367,   -.15
 -.0402,   -.20                              
 -.0433,   -.25
 -.0467,   -.30
 -.0504,   -.35
 -.0542,   -.40
 -.0604,   -.45
 -.0668,   -.50
 -.0759,   -.55
 -.0909,   -.60
 -.1083,   -.65
 -.1410,   -.70
 -.1933,   -.75
 -.2896,   -.80
*SIMPLE SHEAR TEST DATA      
  .0140, .08, .0046
  .0334, .16, .0166
  .0533, .24, .0366
  .0853, .32, .0573
  .1280, .40, .0817
  .1653, .48, .1098
  .2080, .56, .1394
  .2560, .64, .1666
  .2987, .72, .1904
*VISCOELASTIC,TIME=RELAXATION TEST DATA
*SHEAR TEST DATA,SHRINF=0.5000
 1.0000, 0.0001
 0.9695, 0.001
 0.9417, 0.002
 0.8722, 0.005
 0.7913, 0.010
 0.7043, 0.020
 0.6233, 0.050
 0.5736, 0.100
 0.5271, 0.200
 0.5013, 0.500
 0.5000, 1.000
*DENSITY
 1.E-11,
****************************************************
*BOUNDARY
 BOT,1,2     
 CENTER,1
900001000,1
900001000,6
****************************************************
*SURFACE,TYPE=SEGMENTS,NAME=IMPACTOR
 START,141.42,641.42
 CIRCL,-1.,300.,0.,500.
*SURFACE,TYPE=ELEMENT,NAME=TARGET
 ETOP,S3
*RIGID BODY,ANALYTICALSURFACE=IMPACTOR,REFNODE=900001000
*CONTACT PAIR,INTERACTION=ROUGH
 TARGET,IMPACTOR
*SURFACE INTERACTION,NAME=ROUGH
*FRICTION
 0.8, 
****************************************************
*STEP,NLGEOM,INC=200,AMPLITUDE=RAMP,UNSYMM=YES
 Displace punch 250 mm downwards.
*STATIC
 .0015,1.,,.05
*BOUNDARY
900001000,2,2,-250.
*PRINT,CONTACT=YES
*CONTACT CONTROLS,FRICTION ONSET=DELAY
*CONTACT PRINT,SLAVE=TARGET
**CONTACT FILE,SLAVE=TARGET,FREQUENCY=10
*ENERGY PRINT,FREQUENCY=5
*ENERGY PRINT,ELSET=FOAM,FREQ=5
*ENERGY PRINT,ELSET=CENT,FREQ=5
*EL PRINT,FREQUENCY=50,ELSET=CENT   
 S, 
 E,  
*NODE PRINT,FREQUENCY=25
 U,
 RF,
*OUTPUT,FIELD,FREQUENCY=4
*NODE OUTPUT
 U,V,A,RF
*ELEMENT OUTPUT
 S,LE,NE
*CONTACT OUTPUT,VARIABLE=PRESELECT,NSET=TOP
*OUTPUT,HISTORY,FREQUENCY=1
*NODE OUTPUT,NSET=PUNCH
 U,V,A,RF
*ELEMENT OUTPUT,ELSET=CENT
 S,LE,NE
*ENERGY OUTPUT,VARIABLE=PRESELECT
*END STEP
****************************************************
*STEP,NLGEOM,INC=200,AMPLITUDE=RAMP,UNSYMM=YES
 Return punch to original position.
*STATIC
.0015,1.,,.05
*BOUNDARY,OP=MOD
900001000,2,2,0.0
*OUTPUT,FIELD,FREQUENCY=4
*NODE OUTPUT
 U,V,A,RF
*ELEMENT OUTPUT
 S,LE,NE
*CONTACT OUTPUT,VARIABLE=PRESELECT,NSET=TOP
*OUTPUT,HISTORY,FREQUENCY=1
*NODE OUTPUT,NSET=PUNCH
 U,V,A,RF
*ELEMENT OUTPUT,ELSET=CENT
 S,LE,NE
*ENERGY OUTPUT,VARIABLE=PRESELECT
*END STEP