*HEADING
 LARGE STRAIN VISCO - ONE ELEMENT TEST MATERIAL AS IN 4021501 - CPE4H
 APPLY LOAD INSTANTANEOUSLY AND LET RELAX .DO A STATIC STEP
 TO MAKE SURE STATE VARIABLES REMAIN ENFORCED
*NODE
1,
2,10.
3,10.,5.,
4,0.,5.,
*ELEMENT,TYPE=CPE4H,ELSET=ONE
1,1,2,3,4
*SOLID SECTION,ELSET=ONE,MATERIAL=BIDERMAN
1., 
*MATERIAL,NAME=BIDERMAN
*HYPERELASTIC,N=1,MODULI=INSTANTANEOUS
27.02,1.42,0.000001
*VISCOELASTIC,TIME=PRONY
0.25,0.25,5.
0.25,0.25,10.
*BOUNDARY
1,1,2
2,2,2
4,1,1
*STEP,NLGEOM,INC=25
*STATIC
.1,1.
*BOUNDARY
3,1,1,2.
2,1,1,2.
*EL FILE,F=1
S,E,CE,CEP
*NODE FILE,F=1
U,RF
*END STEP
*STEP,NLGEOM,INC=25
*VISCO
5.,50.,2.,10.,
*BOUNDARY
3,1,1,10.
2,1,1,10.
*END STEP
*STEP,NLGEOM
*STATIC
1.,1.
*BOUNDARY
3,1,1,10.
2,1,1,10.
*END STEP