*HEADING
 HYPERELASTIC TEST DATA INPUT 
 TRELOAR'S EXPERIMENTAL DATA
 UNIAXIAL TEST DATA ONLY
*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
*HYPERELASTIC,OGDEN,N=2,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
*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
*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