*HEADING
  - INCOMPRESSIBLE HYPERELASTICITY (YEOH), BIAXIAL TENSION
*PREPRINT,MODEL=YES
*RESTART,WRITE
*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
*NSET,NSET=FACE52
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
*EQUATION
2
FACE52,2,1,3,2,-1
*ELEMENT,TYPE=C3D8R,ELSET=ONE
1,1,2,3,4,5,6,7,8
*SOLID SECTION,ELSET=ONE,MATERIAL=YEOH,CONTROLS=HGC
*SECTION CONTROLS,NAME=HGC,HOURGLASS=STIFFNESS
*MATERIAL,NAME=YEOH
*HYPERELASTIC, YEOH
1.326,-0.326,0.1319,0.001,0.0,0.0
*MULLINS EFFECT
1.25,0.01,0.9
*DENSITY
1.e-4
*DIAGNOSTICS,NONHYBRID=WARNING
*STEP,NLGEOM,INC=20
BIAXIAL TENSION
*STATIC
0.1,1.
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE6,1
FACE4,1,1,1.
*EL PRINT,F=10
S, 
E, 
*NODE PRINT,F=10
U,RF
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=FACE4
U,RF
*ELEMENT OUTPUT,ELSET=ONE
S,
DMENER,
SENER,
*END STEP
*STEP,NLGEOM,INC=20
*STATIC
0.1,1.
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE6,1
FACE4,1,1,0.0
*END STEP