*HEADING
TEST OF URDFIL FOR VISCO PROCEDURE.
*RESTART, WRITE
*NODE
1, 0.,0.
2, 1.,0.
3, 1.,1.
4, 0.,1.
*NSET, NSET=BOT
1, 2,
*NSET, NSET=LEFT
1,4
*NSET, NSET=RIGHT
2,3
*NSET, NSET=NOUT
3, 
*ELEMENT, TYPE=CPE4RH, ELSET=SOLID
1, 1,2,3,4
*MATERIAL, NAME=MAT1
*HYPERELASTIC,N=1,MODULI=INSTANTANEOUS
8.,2.
*VISCOELASTIC,TIME=PRONY
0.5,0.,3.
*SOLID SECTION, ELSET=SOLID, MATERIAL=MAT1
1., 
*BOUNDARY
BOT, 2,2,0.
LEFT, 1,1,0.
*AMPLITUDE, NAME=RAMP, TIME=STEP, VALUE=ABSOLUTE
0.,0., 1.,0.1
*AMPLITUDE, NAME=REVRAMP, TIME=STEP, VALUE=ABSOLUTE
0.,0.1, 1.,0.
*STEP, NLGEOM
*VISCO
0.1,1.
*BOUNDARY, AMP=RAMP
RIGHT, 1,1,0.1
*EL PRINT
S, 
*NODE PRINT
U, 
*EL FILE
S, 
*NODE FILE, NSET=NOUT
U, 
*END STEP
*STEP, NLGEOM
*VISCO
0.1,1.
*BOUNDARY, AMP=REVRAMP
RIGHT, 1,1,0.
*END STEP
*STEP, NLGEOM
*VISCO
0.1,1.
*BOUNDARY, AMP=RAMP
RIGHT, 1,1,0.1
*EL FILE, FREQ=4
S, 
*NODE FILE, FREQ=0
*END STEP