*HEADING
 HYPERELASTIC MARLOW 
 TRELOAR'S EXPERIMENTAL DATA
 BIAXIAL 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
**
*NSET,NSET=FACE22
5,6,7
*EQUATION
2,
FACE22,3,1, 8,3,-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,MARLOW
*BIAXIAL TEST DATA
  0.0,     0.0
  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
*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: 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
*STEP,NLGEOM,INC=20
Step 4: Unload
*STATIC,DIRECT
.5,4.
*BOUNDARY,OP=MOD
FACE4,1
*END STEP
*STEP,NLGEOM,INC=50
Step 5: Biaxial Tension
*STATIC
.1,4.,,0.25
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE6,1
FACE4,1,1,4.
FACE5,2,2,4.
*END STEP
*STEP,NLGEOM,INC=20
Step 6: Unload
*STATIC
.2,4.,,0.5
*BOUNDARY,OP=MOD
FACE4,1
FACE5,2
*END STEP