*HEADING
  - INCOMPRESSIBLE HYPERELASTICITY (REDUCED POLYNOMIAL), UNIAXIAL TENSION
*NODE,NSET=ALL
*NSET,NSET=FACE1
*NSET,NSET=FACE2
*NSET,NSET=FACE3
*NSET,NSET=FACE4
*NSET,NSET=FACE5
*NSET,NSET=FACE6
*ELEMENT,TYPE=C3D8RH,ELSET=ONE
*SOLID SECTION,ELSET=ONE,MATERIAL=REDUCED
*MATERIAL,NAME=REDUCED
*HYPERELASTIC,REDUCED POLYNOMIAL, N=1
100.,
*STEP,NLGEOM,INC=20
UNIAXIAL TENSION
*STATIC,DIRECT
1.,20.
*BOUNDARY,OP=NEW
FACE1,3
FACE3,2
FACE6,1
FACE4,1,1,5.
*EL PRINT,F=10
S,
E,
*NODE PRINT,F=10
U,RF
*EL FILE,F=10
S,E
*NODE FILE,F=10
U,RF
*END STEP