*HEADING
 LARGE STRAIN VISCOELASTICITY - FOAM MODEL (MAT CONST) - CPE4
*NODE
*ELEMENT,TYPE=CPE4,ELSET=ONE
*SOLID SECTION,ELSET=ONE,MATERIAL=SIMPLE
1.,
*MATERIAL,NAME=SIMPLE
*HYPERFOAM,N=3,MODULI=INSTANTANEOUS
-17.4,-1.22,548.2,17.3,10.47,-1.775
*VISCOELASTIC,TIME=PRONY
0.5,0.,3.
*BOUNDARY
1,1,2
2,2,2
4,1,1
*STEP,NLGEOM
*VISCO
2.,10.,2.,10.,
*BOUNDARY
3,1,1,2.
2,1,1,2.
*EL FILE,F=1
S,E,CE
*NODE FILE,F=1
U,RF
*END STEP