*HEADING
:NAFEMS FORCED VIBRATION; TEST 21T; [S4]
(DIRECT INTEGRATION)
*NODE
1, 0.
9, 10.
81, 0., 10.
89, 10.,10.
*NGEN,NSET=BOT
1,9
*NGEN,NSET=TOP
81,89
*NFILL,NSET=NALL
BOT,TOP,8,10
*NSET,NSET=LEFT,GEN
1,81,10
*NSET,NSET=RIGHT,GEN
9,89,10
*NSET,NSET=EDGE
TOP,BOT,RIGHT,LEFT
*NSET,NSET=NMID
45, 
*ELEMENT,TYPE=S4
1, 1,2,12,11
*ELGEN,ELSET=ALLE
1, 8,1,1, 8,10,10
*ELSET,ELSET=EMID
34,35,44,45
*SHELL SECTION,MATERIAL=MAT,ELSET=ALLE
1.0, 
*MATERIAL,NAME=MAT
*DENSITY
8000.,
*ELASTIC
200.E9,0.3
*DAMPING,ALPHA=5.772,BETA=6.929E-5
*BOUNDARY
NALL,1,2
NALL,6
EDGE,1,3
BOT,5
TOP,5
LEFT,4
RIGHT,4
**
** Transient Load
** --------------
**
*STEP,AMP=STEP,INC=1000
*DYNAMIC,NOHAF
0.0001,0.05
*DLOAD
ALLE,P,1.E6
*NODE FILE,NSET=NMID
U, 
*EL FILE,FRE=108,POSITION=AVERAGED AT NODES,ELSET=EMID
S, 
*NODE PRINT,NSET=NMID
U3, 
*EL PRINT,POSITION=AVERAGED AT NODES,ELSET=EMID
S11, 
*ENDSTEP
**
** Increase the damping and timestep to find steady state
**
*STEP,AMP=STEP,INC=1000
*DYNAMIC,NOHAF
0.01,1.0
*DLOAD
ALLE,P,1.E6
*NODE PRINT,NSET=NMID,F=999
U3, 
*NODE FILE,NSET=NMID,F=999
U, 
*ENDSTEP