*HEADING
 HYPERELASTIC TEST DATA INPUT 
 TRELOAR'S EXPERIMENTAL DATA
*RESTART,WRITE,FREQUENCY=5
*NODE,NSET=ALL
1,
2,1.
3,1.,1.,
4,0.,1.,
5,0.,0.,1.
6,1.,0.,1.
7,1.,1.,1.
8,0.,1.,1.
*NSET,NSET=FACE1
1,2,3,4
*NSET,NSET=FACE2
5,6,7,8
*NSET,NSET=FACE3
1,2,5,6
*NSET,NSET=FACE4
2, 
*NSET,NSET=FACE42
3,6,7
*NSET,NSET=FACE5
3,4,7,8
*NSET,NSET=FACE6
4,1,8,5
*EQUATION
** Since the S11 output is Cauchy or true stress, we need to
** determine the nominal stress for post-processing.
** Nodes 3,6,7 are tied to node 2 in dof 1 so that:
** Nominal stress (dof 1) = RF1 (@ node 2) / Original area
** (w/c is 1 x 1 = 1)
2, 
FACE42,1,1, 2,1,-1
*ELEMENT,TYPE=C3D8RH,ELSET=ONE
1,1,2,3,4,5,6,7,8
*SOLID SECTION,ELSET=ONE,MATERIAL=TREL
*MATERIAL,NAME=TREL
** To use the POLYNOMIAL model, simply remove the OGDEN parameter.
** To change the strain energy function order, change the N parameter.
*HYPERELASTIC,OGDEN,N=3,TEST DATA INPUT
*UNIAXIAL TEST DATA
  1.5506,  0.1338
  2.4367,  0.2675
  3.1013,  0.3567
  4.2089,  0.6242
  5.3165,  0.8917
  5.9810,  1.1592
  6.8671,  1.4268
  8.8608,  2.0510
 10.6329,  2.5860
 12.4051,  3.0318
 16.1709,  3.7898
 19.9367,  4.3694
 23.4810,  4.8153
 27.4684,  5.1720
 31.0127,  5.4395
 34.5570,  5.7070
 38.3228,  5.9299
 42.0886,  6.0637
 45.6329,  6.1975
 49.3987,  6.3312
 53.1646,  6.4650
 56.9304,  6.5541
 64.2405,  6.6433
** To fit uniaxial test data only, remove the *BIAXIAL and *PLANAR TEST
** DATA cards and the stress-strain data below.
*BIAXIAL TEST DATA
  0.9384,  0.0200
  1.5900,  0.0600
  2.4087,  0.1100
  2.6220,  0.1400
  3.3240,  0.2000
  4.4278,  0.3100
  5.1830,  0.4200
  6.6024,  0.6800
  7.7794,  0.9400
  9.7857,  1.4900
 12.6351,  2.0300
 14.6804,  2.4300
 17.4000,  2.7500
 20.1058,  3.0700
 22.4502,  3.2600
 24.6530,  3.4500
*PLANAR TEST DATA
** *PLANAR TEST DATA is the new name for *SHEAR TEST DATA (Pure Shear).
  0.6000,  0.0690
  1.6000,  0.1034
  2.4000,  0.1724
  3.3600,  0.2828
  4.2000,  0.4276
  6.0000,  0.8483
  7.8000,  1.3862
  9.6000,  2.0000
 11.1200,  2.4897
 12.9600,  3.0345
 14.8800,  3.4483
 16.5800,  3.7793
 18.2000,  4.0621
*STEP,NLGEOM,INC=50
Step 1: Uniaxial Tension
*STATIC,DIRECT
.25,7.
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE6,1
FACE4,1,1,7.
*ENERGY PRINT
*EL PRINT,FREQUENCY=5
S, 
E, 
*NODE PRINT,FREQUENCY=5
U,RF
*NODE FILE,FREQUENCY=2
U,RF
*OUTPUT,FIELD, FREQUENCY=0
*ELEMENT OUTPUT
S, 
E, 
*NODE OUTPUT, NSET=ALL
U,RF
*OUTPUT,HISTORY,FREQUENCY=1
*NODE OUTPUT, NSET=ALL
U,RF
*END STEP
*STEP,NLGEOM,INC=20
Step 2: Unload
*STATIC,DIRECT
.5,7.
*BOUNDARY,OP=MOD
FACE4,1
*END STEP
*STEP,NLGEOM,INC=50
Step 3: Biaxial Tension
*STATIC,DIRECT
.25,4.
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE6,1
FACE4,1,1,4.
FACE5,2,2,4.
*END STEP
*STEP,NLGEOM,INC=20
Step 4: Unload
*STATIC,DIRECT
.5,4.
*BOUNDARY,OP=MOD
FACE4,1
FACE5,2
*END STEP
*STEP,NLGEOM,INC=50
Step 5: Planar Tension (Pure Shear)
*STATIC,DIRECT
.25,4.
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE5,2 
FACE6,1
FACE4,1,1,4.
*END STEP